Rockwell Automation 1557 User Manual

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Medium Voltage AC Drive

Bulletin 1557

User Manual

Important User Information

IMPORTANT

Read this document and the documents listed in the Additional Resources section about installation, configuration, and operation of this equipment before you install, configure, operate, or maintain this product. Users are required to familiarize themselves with installation and wiring instructions in addition to requirements of all applicable codes, laws, and standards.

Activities including installation, adjustments, putting into service, use, assembly, disassembly, and maintenance are required to be carried out by suitably trained personnel in accordance with applicable code of practice.

If this equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is prohibited.

Throughout this manual, when necessary, we use notes to make you aware of safety considerations.

WARNING: Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION: Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you identify a hazard, avoid a hazard, and recognize the consequence.

Identifies information that is critical for successful application and understanding of the product.

Labels may also be on or inside the equipment to provide specific precautions.

SHOCK HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous temperatures.

ARC FLASH HAZARD: Labels may be on or inside the equipment, for example, a motor control center, to alert people to potential Arc Flash. Arc Flash will cause severe injury or death. Wear proper Personal Protective Equipment (PPE). Follow ALL Regulatory requirements for safe work practices and for Personal Protective Equipment (PPE).

Allen-Bradley, Rockwell Software, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.

Trademarks not belonging to Rockwell Automation are property of their respective companies.

TABLE OF CONTENTS

Chapter 1 .......................................................... Using This Manual

Chapter 2 ......................................................... Introduction

Chapter 3 .......................................................... Specifications

Chapter 4 .......................................................... Hardware Description

Chapter 5 .......................................................... Description of Operation

Chapter 6 .......................................................... Parameter and Variable

Descriptions

Chapter 7 .......................................................... Operator Interface Terminal

Chapter 8 .......................................................... Installation

Chapter 9 .......................................................... Commissioning

Chapter 10 ........................................................ Troubleshooting

Chapter 11 ........................................................ Spare Parts

1557-UM050F-EN-P – June 2013

USING THIS MANUAL 1-1

Warnings tell readers where people may be hurt if procedures are not followed properly.

Cautions tell readers where machinery may be damaged or economic loss can occur if procedures are not followed properly.

This symbol alerts the user to a potential electrical shock hazard which exists on a component or printed circuit board.

Manual Objectives

This manual is intended for use by personnel familiar with Medium Voltage and variable speed solid-state drive equipment. The manual contains material which will allow the user to operate, maintain, and troubleshoot the drive system.

IMPORTANT USER INFORMATION

Because of the variety of uses for this equipment and because of the differences between this solid-state equipment and electromechanical equipment, the user of and those responsible for applying this equipment must satisfy themselves as to the acceptability of each application and use of the equipment. In no event will Rockwell Automation be responsible or liable for indirect or consequential damages resulting from the use or modification of this equipment.

The illustrations shown in this manual are intended solely to illustrate the text of this manual Because of the many variables and requirements associated with any particular installation, Rockwell Automation cannot assume responsibility or liability for actual use based upon the illustrative uses and applications.

No patent liability is assumed by Rockwell Automation with respect to use of information, circuits, equipment or software described in this text.

Reproduction of the content of this manual, in whole or in part, without written permission of Rockwell Automation is prohibited.

Both of these:

• Identify a possible trouble spot.

• Tell what causes the trouble.

• Give the result of improper action.

• Tell the reader how to avoid trouble.

1557-UM050F-EN-P – June 2013

1-2 USING THIS MANUAL

REPAIR OR REPAIR/EXCHANGE PROCEDURE

For your convenience, Rockwell Automation and Rockwell Automation Global Technical Services(GTS), provide an efficient and convenient method of returning equipment eligible for repair or repair/exchange.

A Product Service Report (P.S.R.) number is required to return any equipment for repair. This may be obtained from your area Rockwell Automation Distributor, Sales Office or Area Support Division.

Return any equipment to be repaired to the Area Support Division nearest you. Be sure to reference the P.S.R. number on the carton and packing slip. Include your company name and address, your repair purchase order number, and a brief description of the problem. This will facilitate quick return of your equipment.

A complete listing of Global Technical Services offices may be obtained by calling your area Rockwell Automation Distributor or Sales Office.

1557-UM050F-EN-P – June 2013

INTRODUCTION CHAPTER 2

The Bulletin 1557 drive is a Pulse Width Modulated Current Source Machine side converter (PWM - CSI). It is designed to supply 3 phase currents to standard induction motor loads. The Bul. 1557 MV (medium voltage) drive converts 3 phase 50/60 Hz input power to an adjustable AC frequency current source for speed control of AC squirrel cage motors.

The solid state technology used in the design is of proven reliability. A number of circuit implementation techniques used are unique to the Allen-Bradley Bulletin 1557 drive.

The basic design philosophy emphasizes the isolation of single component failures, such that multiple component failures do not occur. This leads to a low MTTR, (Mean Time To Repair), with extensive fault diagnostic circuits and easy accessibility.

The basic design features of the Allen-Bradley Bulletin 1557 drive are as follows: The three phase motor currents are sinusoidal with low total harmonic distortion. The design uses isolated driver circuits, one per gate turn off thyristor (GTO), and

silicon controlled line side converter (SCR). Two output phases are individually current sensed, ensuring protection and control.

The design is capable of producing smooth low speed torque with low harmonic current to the motor.

A fuseless electronic protection scheme is used in the power circuit for normal fault conditions. Power fuses provide back up protection and ensure safety.

Heatsinks are monitored with temperature sensors to detect overtemperatures. (BUL 1557 Air-cooled units only)

The 1557 Drive uses a North American design base with all components readily accessible from the front without need to extensively dismantle the unit.

The drive system logic is microcomputer based, thus eliminating numerous trimpots for system calibration.

Fault and alarm indication is performed using an operator interface panel.

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2-2 INTRODUCTION

An Input contactor with fused isolating switch is optional on the 1557 drive and is only supplied

when specified or if the customer does not have an existing full voltage starter.

The standard 1557 drive is a tachless design. A tachometer is recommended for applications

requiring an output frequency lower than 6 hertz or applications with a starting torque greater than 30%.

A drive isolation transformer or AC line reactor is required with each drive. An isolation

transformer is mandatory when existing motors are used, 12-Pulse line side converters are used, or for stepping down the main supply voltage. An AC line reactor may only be used when new motors are used with the proper level of phase to ground insulation. Consult your Rockwell Automation representative for more information.

1557-UM050F-EN-P – June 2013

SPECIFICATIONS CHAPTER 3

The electrical and environmental specifications of the Bulletin 1557 MV Drive are provided below:

Input Voltages: 2300Vac ± 10%, 3-Phase 3300Vac ± 10%, 3-Phase 4160Vac ± 10%, 3-Phase 6900Vac ± 10%, 3-Phase

Input Frequency: 50/60Hz ± 3Hz

Efficiency: 97% at full load (minimum)

Output Voltage: 0 to 2300Vac, 3-Phase 0 to 3300Vac, 3-Phase 0 to 4160Vac, 3-Phase 0 to 6900Vac, 3-Phase

Output Frequency: 6Hz to 75Hz (Without Tach)

0.2Hz to 75 Hz (With Tach) Speed Regulation: 0.5% of maximum speed (Without Tach)

0.1% of maximum speed (With Tach) Speed Reference: 0 to 10V dc or

4 to 20 mA dc

Operating Temperature: Ambient temperature must be within the range of 0° to 40°C

with a relative humidity of up to 95% (non-condensing)

Storage Temperature: Ambient temperature must be within the range of –40° to 70°C

Altitude: No derating below 1000 m above sea level

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3-2 SPECIFICATIONS

1557-UM050F-EN-P – June 2013

HARDWARE DESCRIPTION 4-1

Hardware Overview

The basic drive consists of two cabinets; the D.C. link/control cabinet and the converter cabinet. An input contactor cabinet is optional. (See Figure 4.1)

Figure 4.1 – Outline of 1557 Drive

1557-UM050F-EN-P – June 2013

4-2 HARDWARE DESCRIPTION

DC Link Control Cabinet

The D.C. link/control cabinet is 44 inches wide. The top section has a panel with operator interface devices mounted on a door within a door. A fully vented door is in the bottom position.

Access to the low voltage control compartment is gained through the hinged low voltage panel. All low voltage compartments contain the following elements:

4.2 (A) Fiber optic interface boards ( 2 )

4.2 (B) Drive control boards ( 2 for 6-pulse, 3 for 12-pulse )

4.2 (C) Communication processor board ( 1 )

4.2 (D) Digital I/O boards ( 2 )

4.2 (E) D.C./D.C. converter ( 1 )

4.2 (F) A.C./D.C. power supply ( 1 )

4.2 (G) Capacitors See Figure 4.2

Figure 4.2 – Typical Low Voltage Compartment

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HARDWARE DESCRIPTION 4-3

Warning: Allow 5-10 minutes for motor filter capacitors to safely discharge voltage prior to opening cabinet doors.

D.C. Link Reactor

The D.C. link reactor is floor mounted and may be shipped separately and installed on site in larger drives.

Motor Filter Capacitors

Located behind the low voltage compartment, the motor filter capacitors are accessible when the upper medium voltage door is opened. There are 3 capacitors for low horsepower drives and 6 for larger drives. The capacitors are liquid filled and mounted on rails. The metal cases of the capacitors are grounded to the cabinet.

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4-4 HARDWARE DESCRIPTION

4.3(A)

4.3(D)

4.3(F)

4.3(B)

4.3(C)

4.3(E)

Line side converter Components

The line side converter is located in the lower half of the converter cabinet. The line side converter consists of three identical cells; each cell consists of the following:

4.3 (A) -line side converter heatsink stack

-Silicon Controlled Line side converter (SCR) thyristors

-heatsinks

-clamp

4.3 (B) -snubber capacitors

4.3 (C) -snubber resistors

4.3 (D) -voltage sharing/diagnostic resistors

4.3 (E) -gate driver circuit boards

4.3 (F) -power supply boards (See Figure 4.3 )

Figure 4.3 – Line Side Converter Components

(2300 V Line Side Converter shown)

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HARDWARE DESCRIPTION 4-5

4.4(A)

4.4(E)

4.4(D)

4.4(G)

4.4(C)

4.4(D)

4.4(B)

4.4(F)

Machine side converter Components

The machine side converter is located in the upper half of the converter cabinet. The machine side converter consists of three identical cells. each cell consists of the following:

4.4 (A) -machine side converter heatsink stack assemblies

-Gate Turn Off (GTO) thyristors

-heatsinks

-clamp

4.4 (B) -snubber resistors

4.4 (C) -snubber capacitors

4.4 (D) -snubber diode assemblies

- Fast recovery diode

- diode clamp

-snubber capacitors for the snubber diodes

-snubber resistors for the snubber diodes

4.4 (E) -voltage sharing/diagnostic resistors

4.4 (F) -gate driver circuit boards

4.4 (G) -power supply boards (See Figure 4.4 )

Figure 4.4 – Machine Side Converter Components

(2300 V Machine Side Converter shown)

Three of the machine side converter heatsink assemblies (one in each phase) have thermistors mounted on the heatsinks, each thermistors is wired to a small circuit board (Thermistor Feedback board) which is located near the gate driver boards. In the event of heatsink overtemperature, a fault signal is sent to the controller and the drive will shut down.

1557-UM050F-EN-P – June 2013

4-6 HARDWARE DESCRIPTION

Voltage Feedback Circuit Boards

Voltage feedback boards are located in the converter cabinet on the far left side mounted on a vertical glass polyester channel. The boards consist of series connected resistors for sensing input voltage, DC link voltage, and output voltage.

Cooling Fans

There are several different arrangements of cooling fans. Fans are required to remove heat from the drive to ensure proper operation of its components. The fans draw air into the drive through the vented lower doors and exhaust it through vented enclosures at the top of the drive.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION CHAPTER 5

Introduction ......................................................................................................................... 1

Speed Command ................................................................................................................ 3

Skip Speeds ........................................................................................................................ 5

Speed Ramp ....................................................................................................................... 7

Speed Control ..................................................................................................................... 9

Flux Control ....................................................................................................................... 11

Flux Control for Synchronous Motor .................................................................... 13

Current Control .................................................................................................................. 14

Line Converter Feedback .................................................................................................. 16

Machine Converter Feedback ........................................................................................... 18

Motor Model ...................................................................................................................... 20

Line Converter Protection ................................................................................................. 22

Machine Converter Protection .......................................................................................... 24

Analog Outputs ................................................................................................................. 26

Test Modes ....................................................................................................................... 28

Synchronous Transfer ....................................................................................................... 29

Transfer To Bypass ........................................................................................................... 30

Transfer To Drive .............................................................................................................. 31

Thyristor Diagnostics

Bulletin 1557 Drive ............................................................................................... 33

Bulletin 1557M Mini Drive .................................................................................... 35

Flying Start ................................................................................................................ 36

Tachometer/Encoder Option ............................................................................................. 37

1557-UM050F-EN-P –June 2013

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-1

Introduction The Bulletin 1557 is an adjustable speed ac drive in which motor speed control is achieved through

control of the motor torque. The motor speed is measured and the torque is adjusted as required to make the measured speed equal to the speed command. The stator frequency is determined by the motor and load and the drive synchronizes itself to the motor. This is in contrast to the more common volts/hertz ac drive in which the drive determines the stator frequency and does not attempt to synchronize its output to the motor.

The method of control used is known as direct vector control. The term vector control indicates that the position of the stator current vector is controlled relative to the motor flux vector. Direct vector control means that the motor flux is measured, in contrast to the more common indirect vector control in which the motor flux is predicted. In both cases, the stator current is resolved into flux producing and torque producing components which are controlled independently. The intent is to achieve performance similar to a dc machine, in which the torque can be changed quickly without affecting the flux. The flux cannot be changed quickly because of the rotor time constant, which is in the range of seconds for large machines.

The following description of operation is organized in the same functional blocks as the control block diagram (Figure 5.1). Most of the functions are the same as those found in any adjustable speed ac or dc drive. The features which are unique to a direct vector controlled drive are confined to the motor model and flux control functions.

The Bulletin 1557 drive can be used with either induction (asynchronous) or synchronous motors. Synchronous motor drives are identical to induction motor drives except for the addition of a current regulated field supply to the synchronous drive. The features that are unique to a synchronous drive are confined to the flux control function and the encoder option.

1557-UM050F-EN-P –June 2013

5-2 DESCRIPTION OF OPERATION

SPEED

COMMAND

SPEED

RAMP

SPEED

CONTROL

MOTOR

MODEL

LINE

CONVERTER

FEEDBACK

CURRENT

CONTROL

FLUX

CONTROL

SKIP

SPEEDS

LINE

CONVERTER

PROTECTION

MACHINE

CONVERTER

PROTECTION

MACHINE

CONVERTER

FEEDBACK

SYNCHRONOUS

TRANSFER

Flux

Feedback

Slip

Speed

Magnetizin

g Current

Command

Torque

Current

Comand

Stator

Frequency

Tach

Feedback

MOTOR

Faults

Voltage

Feedback

Current

Feedback

Link

Motor Filter

Capacitor

Faults

Voltage

Feedback

Current

Feedback

Line

Converter

Machine

Converter

Line

Converter

Firing Angle

Machine

Converter

Firing Angle

(Pxxx) Indicates a read/write parameter with a linear number of xxx.

(Vxxx) Indicates a read only variable with a linear number of xxx.

Speed

Commands

Figure 5.1

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-3

Speed Command

The function of the speed command block is to select one of 12 possible speed command inputs to serve as the drive speed command. Bits 12-15 of the Logic Command are used to select the Speed Command Input from the following list:

2 analog inputs (0-10V) 3 preset speed commands 6 SCANbus ports 1 preset jog speed command

The two analog speed command inputs accept 0-10V signals. The range of each of the analog inputs is defined by two parameters. These parameters can be adjusted to cause the speed command to either increase or decrease with an increasing analog input.

The six SCANport ports are multiplexed into a single SCANport input. The range of the digital input is defined by two parameters in the same way as the analog inputs.

The selected speed command input is clamped to a minimum level set by parameter Speed Command Minimum and a maximum level set by parameter Speed Command Maximum. (See Parameter and Variable Description in Chapter 6.)

1557-UM050F-EN-P –June 2013

5-4 DESCRIPTION OF OPERATION

0V 10V

A/D

Speed cmd 0 max (P42)

Speed cmd 0 min (P41)

Analog

input 1L

(V353)

Line

AI1

ANALOG SPEED

COMMAND INPUT

0V 10V

A/D

Speed cmd 8 max (P44)

Speed cmd 8 min (P43)

Analog

input 1M

(V355)

Machine

AI1

ANALOG SPEED

COMMAND INPUT

0 32767

Speed cmd 9 max (P46)

Speed cmd 9 min (P45)

DIGITAL SPEED

COMMAND INPUT

SCANport input (V398)

Speed command 0

(V273)

0000 (0)

Preset speed 1

(P33)

0001 (1)

Preset speed 2

(P34)

0010 (2)

Preset speed 3

(P35)

0011 (3)

Speed command 8

(V274)

1000 (8)

1001 (9)

1010 (10)

1011 (11)

1100 (12)

1101 (13)

1110 (14)

Preset jog speed

(P40)

1111 (15)

Speed Command in

(V276)

Speed command 9

(V275)

Speed cmd max

(P48)

Speed cmd min

(P47)

to skip speed

processing

Logic command bits 12 - 15 (spd cmd select)

(V258)

Speed Command

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-5

Skip Speeds

Four skip speeds are provided which may be used to prevent the drive from continuously operating at certain speeds, usually to avoid exciting mechanical resonance. Each of the four skip speed zones is defined by two parameters that specify its center point and width. Skip speed zones that overlap are merged.

After skip speed processing, the speed command input has its sign changed if reverse rotation is selected, or is set to zero if there is no run request.

1557-UM050F-EN-P –June 2013

5-6 DESCRIPTION OF OPERATION

Skip speed 1

(P49)

Skip speed 2

(P50)

Skip speed 4

(P52)

Skip speed 3

(P51)

Skip speed

band 1

(P53)

Skip speed

band 2

(P54)

Skip speed

band 3

(P55)

Skip speed

band 4

(P56)

from speed

command limit

-1

Speed command

(V277)

Logic status bit 1 (V258)

(Running)

Logic status bit 2 (V258)

(Forward command)

Skip Speeds

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-7

Speed Ramp

The function of the speed ramp is to control the rate of change of the drive speed reference. Independent four section ramps are provided for acceleration and deceleration. Each ramp is defined by four speed points which are specified by parameters Ramp Speed 1 to 4 which are the same for both accelerating and decelerating, and four time intervals which are specified by parameters Acceleration Time 1 to 4 and Deceleration Time 1 to 4. The input to the speed ramp is the speed command from the skip speed block. The drive control selects the appropriate acceleration or deceleration rate based on the present value of the ramp output and whether it is increasing or decreasing. The output of the speed ramp is the speed reference, which is the input to the speed control block. If the motor is coasting and speed feedback is available, the speed reference is set equal to the motor speed.

1557-UM050F-EN-P –June 2013

5-8 DESCRIPTION OF OPERATION

Accel

time 1

(P65)

Accel

time 2

(P66)

Accel

time 3

(P67)

Accel

time 4

(P68)

Decel

time 4

(P65)

Decel

time 3

(P66)

Decel

time 2

(P67)

Decel

time 1

(P68)

Ramp speed 3

(P75)

Ramp speed 2

(P74)

Ramp speed 1

(P73)

Ramp speed 4

(P76)

Speed

Reference

(V278)

Speed Ramp

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-9

Speed Control

The function of the speed control block is to determine the torque current command. The inputs are the speed reference from the speed ramp, and the stator frequency and slip frequency from the motor model.

Either tach feedback is used, or the slip frequency is subtracted from the stator frequency to determine the motor speed, which is then made negative if the motor is rotating in reverse. The result is filtered by an adjustable second order low pass filter to obtain the drive speed feedback.

The speed feedback is subtracted from the speed reference to determine the speed error. Parameter Speed Reference Step, which is used to demonstrate the step response of the speed loop, is added to the speed error to form the input to the speed regulator. The response of the speed regulator is determined by parameters Speed Regulator Bandwidth and Total Inertia. The rate of change of the speed regulator output is limited to the value specified by parameter Torque Rate Limit. The output of the speed regulator is clamped to the value specified by parameter Torque Limit Motoring for positive values and to the value specified by parameter Torque Limit Braking for negative values. The clamped output of the speed regulator is the torque reference. This is divided by the flux reference to determine Isq Command, which is the torque component of the stator current command.

Without a tachometer, reliable speed feedback is not available at stator frequencies below about 5 Hz. The speed regulator is therefore disabled at low speed and the torque reference is determined by open loop programming. The torque reference changes linearly from the value specified by parameter Torque Command 0 at zero speed to the value specified by parameter Torque Command 1 at Ramp Speed 1, and remains constant above this speed if the drive is still in start mode. When tach feedback is enabled the open loop torque programming is not used.

An estimate of the torque producing current supplied by the motor filter capacitor is calculated from Isq Command, stator frequency, and parameters Total Leakage Inductance and Filter Capacitor. The resulting value is called Icq Command and is subtracted from Isq Command to determine Iy Command, which is the torque component of the dc link current command.

1557-UM050F-EN-P –June 2013

5-10 DESCRIPTION OF OPERATION

Tach

feedback

(V348)

Slip

frequency

(V343)

Stator

frequency

(V337)

Speed Feedback Mode

(P89)

-1

Logic status bit 3 (V258)

(Forward rotation)

SPEED

FEEDBACK

FILTER

Speed fdbk filter

(P110)

Speed

reference

(V278)

from

sync

transfer

Sync spdref

SPEED

REGULATOR

RATE

LIMIT

TORQUE

LIMITING

Trq command 0

(P86)

Trq command 1

(P87)

Ramp speed 1

(P73)

Speed ref step (P88)

Speed

error

(V290)

Spdreg

bandwidth

(P81)

Total

Inertia

(P82)

Trq rate

limit (P83)

Start mode

STARTING TORQUE

PROGRAMMING

Trq limit

motoring

(P84)

Trq limit

braking

(P85)

Filter capacitor

(P133)

SPEED CONTROL

L Total

leakage

(P130)

Icq

command

(V293)

Flux

reference

(V305)

Logic Status Bit (V258)

(Running)

Speed

Feedback

(V289)

ISQ

Command

(V292)

Command

(V294)

Torque

Reference

(V291)

Speed Control

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-11

Flux Control

The function of the flux control block is to determine the magnetizing current command. The inputs are flux feedback and stator frequency from the motor model, speed feedback from the speed control block, and line voltage from the current control block.

Below base speed, the flux command varies linearly with Torque Reference from the value specified by parameter Flux Command No Load at zero torque to the value specified by parameter Flux Command Base Speed at rated torque. Above base speed, the drive goes into field weakening and the flux command decreases with increasing speed. The flux command also decreases when the current regulator approaches advance limit or retard limit.

The flux reference is determined by adding parameter Flux Reference Step, which is used to demonstrate the step response of the flux regulator, to the flux command. The flux feedback is subtracted from the flux reference to determine the flux error, which is the input to the flux regulator. The response of the flux regulator is determined by parameters Flux Regulator Bandwidth, Magnetizing Inductance, and Rotor Time Constant. The output of the flux regulator is called Isd Command 1. An open loop estimate of the magnetizing current called Isd Command 0 is determined by dividing the flux reference by parameter Magnetizing Inductance. Isd Command 0 and Isd Command 1 are added to produce Isd Command, which is the magnetizing component of the stator current command.

An estimate of the magnetizing current supplied by the motor filter capacitor is calculated from Isd Command, stator frequency, and parameters Total Leakage Inductance and Filter Capacitor. The resulting value is called Icd Command and is subtracted from Isd Command to determine Ix Command, which is the magnetizing component of the dc link current command. Ix Command becomes negative at high speed because the motor filter capacitor supplies more magnetizing current than the motor requires.

1557-UM050F-EN-P –June 2013

5-12 DESCRIPTION OF OPERATION

V line

(V324)

Speed feedback

(V289)

Base Speed

(P98)

Lm+2Ls'

Flx ref

step

(P102)

L magnetizing

(P131)

Isd command 0 (V308)

Isd

command 1

(V309)

Flux

reference

(V305)

Logic status

bit 1 (V258)

(Running)

Isd

command

(V310)

1.0

-1.0

Flx cmd

base spd

(P100)

Flx cmd

no load

(P103)

Torque

reference

(V291)

Flux

feedback

(V306)

FLUX COMMAND

PROGRAMMING

FLUX

LIMITING

Flux error

(V307)

FLUX

REGULATOR

Flxreg

bandwidth

(P97)

L magnetizing

(P131)

T rotor

(P132)

EXCITATION

CURRENT

LIMITING

L total

leakage

(P130)

Icd

command

(V311)

Command

(V312)

Filter

capacitor

(P133)

Flux Control

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-13

Icd command

gain (P105)

Icd command

(V311)

Isd command

(V310)

If cmd bandwidth

(P104)

LOW PASS

L magnetizing

(p131)

Lmd

(P135)

command

(V312)

I field

command

(V314)

+++

+ -

Flux Control for Synchronous Motor

Most of the magnetization for a synchronous motor is supplied by the rotor field winding, unlike an induction motor where all of the magnetizing current is supplied through the stator. However, control of the motor flux through the field current is very slow because of the large time constant of the dc field winding and the current and voltage limitations of the field supply. To obtain sufficiently fast response from the flux regulator the magnetizing current is split into transient and steady state components, with the steady state component supplied through the rotor and the transient component through the stator.

The additions to the flux control required for synchronous machines are shown in the block diagram below. A low pass filter controlled by parameter If Cmd Bandwidth is used to extract the steady state component of Isd Command which becomes I Field Command, the current reference for the field supply. The transient component of Isd Command is obtained by subtracting I Field Command from the original Isd Command and multiplying by the ratio of L magnetizing to Lmd to provide the same gain for the steady state and transient components. The portion of the motor filter capacitor current supplied by the drive is then added to determine Ix Command, which is the magnetizing component of the dc link current command.

Parameter Icd Command Gain determines how the motor filter capacitor current is split between the motor and the drive. When this parameter is set to its minimum value of 0.0, all the capacitor current is supplied by the drive. The line current is higher than the motor current and the motor operates at approximately unity power factor. When this parameter is set to its maximum value of 1.0, all the capacitor current is supplied by the motor. The line current is less than the motor current and the motor operates at a lagging power factor with reduced field current. Increasing Icd Command Gain improves the input power factor of the drive, but also increases the coupling between flux and torque and causes the stability of the flux control to deteriorate.

1557-UM050F-EN-P –June 2013

5-14 DESCRIPTION OF OPERATION

Current Control

The function of the current control block is to determine the firing angles of the line and machine converters. The inputs are the torque and flux producing components of the dc link current command from the speed control and flux control blocks respectively, and the dc link current and line voltage from the line converter feedback.

The square root of the sum of the squares of Ix Command and Iy Command is calculated to determine the dc link current command. In dc current test mode, parameter DC Current Test Command is used as the dc link current command. Parameter DC Current Reference Step, which is used to demonstrate the step response of the current regulator, is added to the current command and the sum is clamped to a minimum value of zero to produce the dc current reference. The dc current feedback is subtracted from the dc current reference to determine the dc current error, which is the input to the current regulator. The response of the current regulator is determined by parameters Current Regulator Bandwidth, DC Link Inductance, and DC Link Time Constant. The output of the current regulator is clamped to a fixed positive limit of 0.990 pu, and to a variable negative limit called the retard limit. Retard limit is calculated from dc current feedback, line voltage feedback, and parameter Commutation Inductance, and its function is to ensure reliable commutation of the line converter when regenerating. When the drive is not running, the dc voltage reference is set equal to the retard limit to force the dc link current to zero as quickly as possible.

The line converter firing angle is the inverse cosine of the dc voltage reference. The machine converter firing angle is determined by taking the inverse cosine of the ratio of Ix Command to the dc current command, adding 90 degrees and changing the sign.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-15

-1

X + Y

CURRENT

REGULATOR

(V312)Iy(V294)

Idc

Command

Test (P119)

Idc test mode

COS

-1

90 Degrees

Alpha

Machine

(V328)

Curreg

bandwidth

(P113)

Idc ref

step

(P120)

Idc

reference

(V321)

Idc

error

(V323)

T DC link

(P115)

L DC link

(P114)

I dc

feedback

(V322)

V line

(V324)

0.80 pu

L commutation

(P117)

0.99 pu

COS

-1

Alpha

Line

(V328)

V dc Reference

(326)

Logic Status Bit 1 (V255)

(Running)

Current Control

1557-UM050F-EN-P –June 2013

5-16 DESCRIPTION OF OPERATION

Line Converter Feedback

The function of the line converter feedback block is to convert the raw voltage and current feedback signals to the form required by the drive control software. It represents most of the analog portion of the line side Drive Control Board. Since identical hardware is used for both converters, some functions are not used on one or the other.

The two line converter voltage feedback boards provide a total of five voltage feedback signals representing the three ac (V1, V2, V3) and two dc (VP, VN) line to ground voltages. The two dc voltages are subtracted to determine the line side dc link voltage (VDC), which is used by the hardware dc link overvoltage protection. The three ac voltages are summed to produce the neutral to ground voltage (VNG) on the input transformer. This signal is not monitored by the drive control. The three ac line to ground voltages are subtracted from each other to produce the three ac line to line voltages (V12, V23, V31).

The first two line to line voltages are integrated and a signal which is the product of the corresponding (fictitious) "delta" current and the commutating inductance is subtracted from each to compensate for the commutation notches. The resulting reconstructed line voltages are called "flux" signals because the corresponding signals on the machine side represent rotor flux. The third flux signal (F31) is produced by inverting and adding the other two flux signals (F12, F23). The three flux signals are half-wave rectified and added to produce the flux magnitude feedback (FLX), which is proportional to the volts/Hz of the supply and is used as the input to an A/D converter which measures the line voltage magnitude. The flux signals are also converted to three square waves that are combined and used to synchronize the line converter firing to the line voltage.

Current feedback is provided by current transformers in two of the ac input lines. The current in the remaining phase (I2) is reproduced by inverting and adding the other two current feedback signals (I1, I3). The line current feedback signals are subtracted and rescaled to create the two fictitious delta currents (I12, I23) used in the reconstruction of the input voltages described in the preceding paragraph. The three line current feedback signals are also half-wave rectified and added to produce the dc link current feedback (IDC), which is used as the input to an A/D converter and to the hardware overcurrent protection.

The preceding description applies to 6-pulse and 12-pulse converters using the original Drive Control Board 80165-018, which has no voltage feedback from the slave bridge. For 12- or 18-pulse converters using the new 18-Pulse Drive Control Board 80190-118, there is voltage and current feedback from all bridges, which is combined to create an equivalent 6-pulse feedback.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-17

V line

(V324)

Line

Frequency

D/AD/A

A/D

F/D

A/D

-1

VNG

INTEGRATORS

V12

V23

V31

VDC

phase to

ground

voltages

phase

currents

F12

F23

F31

FLX

I DC

Feedback

(V322)

I DC

I12

I23

Hardware

Software

L commutation

(P117)

Line Converter Feedback

1557-UM050F-EN-P –June 2013

5-18 DESCRIPTION OF OPERATION

Machine Converter Feedback

The function of the machine converter feedback block is to convert the raw voltage and current feedback signals to the form required by the drive control software. It represents most of the analog portion of the machine side Drive Control Board. Since identical hardware is used for both converters, some functions are not used on one or the other.

The two machine converter voltage feedback boards provide a total of five voltage feedback signals representing the three ac (V1, V2, V3) and two dc (VP, VN) line to ground voltages. The two dc voltages are subtracted to determine the machine side dc link voltage (VDC), which is used by the hardware dc link overvoltage protection. The three ac voltages are summed to determine the motor neutral to ground voltage (VNG), which is used as the input to an A/D converter which measures this voltage for ground fault protection purposes. The three ac line to ground voltages are subtracted from each other to produce the three motor line to line voltages (V12, V23, V31).

A signal that is the product of the corresponding (fictitious) “delta” current and the stator resistance is

subtracted from the first two stator voltages to compensate for the stator resistance drop. These two voltages are then integrated and a signal which is the product of the corresponding "delta" current and the motor total leakage inductance is subtracted from each to produce the rotor flux signals. The third flux signal (F31) is produced by inverting and adding the other two flux signals (F12, F23). The three flux signals are half-wave rectified and added to produce the flux magnitude feedback (FLX), which is used as the input to an A/D converter which measures the rotor flux magnitude. The flux signals are also converted to three square waves that are combined and used to determine the stator frequency and to synchronize the machine converter firing to the motor flux.

Stator current feedback is provided by current transducers (LEM's) in two of the motor phases. The current in the remaining phase (I2) is reproduced by inverting and adding the other two current feedback signals (I1, I3). The stator current feedback signals are subtracted and rescaled to create the two fictitious delta currents (I12, I23) used in the reconstruction of the rotor flux described in the preceding paragraph. A three phase to two phase conversion of the stator current feedback is performed by designating phase 1 as the "alpha" phase, and inverting one of the delta current signals to provide the "beta" phase which is in quadrature with the "alpha" phase. These two signals are used as the inputs to A/D converters that measure the two components of stator current.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-19

D/AD/A

A/D

F/D

A/D

-1

VNG

INTEGRATORS

V12

V23

V31

VDC

phase to

ground

voltages

phase

currents

R stator (P129)

L total leakage

(P130)

F12

F23

F31

FLX

Flux from

voltage (V342)

Is alpha

I12

I23

Hardware

Software

A/D

Is beta

V neutral

motor

(V347)

- 1

Stator

Frequency

(V337)

Machine Converter Feedback

1557-UM050F-EN-P –June 2013

5-20 DESCRIPTION OF OPERATION

Motor Model

The function of the motor model block is to calculate the motor current, voltage, flux, torque, power, and slip frequency.

After the three phase to two phase conversion described in the machine converter feedback section, the resulting stator current feedback signals (alpha and beta) are converted from analog to digital form. They are then transformed from the stationary reference frame to the rotor flux reference frame that rotates at stator frequency. This transformation produces two components of stator current which, ignoring harmonics, are dc quantities in the steady state. The two components of stator current are the direct axis current (Isd) in phase with the rotor flux, and the quadrature axis current (Isq) which is displaced 90 degrees from the rotor flux. The stator current magnitude is calculated by taking the square root of the sum of the squares of the two components of stator current.

The two components of stator current are used along with parameters Rotor Time Constant and Magnetizing Inductance to calculate the slip frequency and the rotor flux. Slip frequency is used in the calculation of the motor speed. The rotor flux calculated from current is used in the low speed range on drives fitted with a tachometer. The rotor flux determined from voltage and current that is described in the machine converter feedback section is used in the high speed range and is not usable at very low speeds. Without a tachometer, the flux feedback selection is permanently set to the flux feedback derived from voltage and the flux feedback derived from current is not used. Therefore, there is no flux feedback available below about 5 Hz and open loop control is employed as described in the speed control and flux control sections.

The flux feedback is used along with the two components of stator current, the stator frequency, and parameters Stator Resistance and Total Leakage Inductance to calculate the stator voltage. The motor torque is calculated by multiplying the flux feedback by the q-axis current, which is then multiplied by the speed to determine the motor power. Motor voltage, torque, and power are therefore all calculated rather than measured quantities.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-21

Is alpha

Is beta

VECTOR

ROTATOR

STATOR

VOLTAGE

CALCULATION

Isq

(V339)

Isd

(V338)

Slip

frequency

(V343)

Flx from

current

(V341

T rotor

(P132)

L magnetizing

(P131)

ROTOR

FLUX

CALCULATION

FDBK

SELECT

X + Y

Stator

frequency

(V337)

Flx from

voltage

(V342

Speed

feedback

(V259)

Flux

feedback

R Stator

(P129)

L total leakage

(P130)

I stator

(V340)

V stator

(V344)

Flux feedback

(V306)

Torque

(V345)

Motor power

(V346)

Motor Model

1557-UM050F-EN-P –June 2013

5-22 DESCRIPTION OF OPERATION

Line Converter Protection

Except for the dc link overcurrent and overvoltage detection, the line converter protection is implemented entirely in software. Adjustable parameters specifying the trip level and time delay are provided for each fault (see Chapter 6, Parameter and Variables Description). The dc link current and line voltage feedback are obtained as described in the section on line converter feedback. The current feedback for ground fault detection is obtained from a zero sequence current transformer installed in the drive input (only on drives with AC line reactor). The voltage across the CT burden resistor is measured through a differential analog input (AI2) on the line converter Drive Control Board.

For all faults except line converter overload, if the measured voltage or current exceeds the specified trip level for the specified time interval, the corresponding fault bit is set in one of the fault words and the master fault bit is set in Logic Status 1. For the detection of overload faults, the dc link current is first converted to its ac equivalent by multiplying by 1.10 and then squared. The amount by which the square of the current exceeds a threshold level is then integrated with time. An overload fault is declared if the output of the integrator exceeds the trip level calculated from the specified overload trip level and time. An overload warning is issued when the I2t level reaches half the trip level.

The response to a line converter fault falls into three categories, depending on the type of fault. For class 1 faults, such as line overcurrent, line overvoltage and undervoltage, and dc link overcurrent and overvoltage, the line converter is immediately phased back to retard limit until the current drops to zero. The gating is then disabled and the input and output contactors are opened. For class 2 faults, such as ground fault and overload, the motor is brought to a normal stop before the drive is shut down and the contactors opened. For class 3 faults (warnings), such as a pending overload, no action is taken.

The dc link overcurrent and overvoltage are special cases in that the fault detection is performed by hardware but the time delay is performed by software. The detection of these two faults is implemented in hardware because a very fast response is required. The hardware fault detection responds to instantaneous values rather than average values as the software fault detection does. The response to dc link overcurrent faults is different from all other faults because it freezes the GTO gating until the dc link current has dropped to zero. This action is taken to prevent the GTO's from being destroyed by attempting to commutate a current above their safe rating. Line converter current feedback is used for this function instead of motor current feedback because the motor current includes the current supplied by the filter capacitor, which does not flow through the GTO bridge.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-23

Line O/C trip

(P161)

Idc feedback

(V322)

TIME

DELAY

Line O/C

delay

(P162)

Line overcurrent

Fault Flags 1L bit 4

(V369)

V Line

(V324)

Line O/V trip

(P165)

TIME

DELAY

Line O/V

delay

(P166)

Line overvoltage

Fault Flags 1L bit 6

(V369)

TIME

DELAY

Line U/V delay

(P168)

Line Uvervoltage

Warning Flags

bit 2 (V373)

Line U/V trip

(P167)

DC O/C trip

(P169)

IDC

TIME

DELAY

DC O/C delay

(P170)

Line h/w o/c

Fault Flags 1L bit 5

(V369)

Line DC O/V trip

(P173)

VDC

TIME

DELAY

Line DC O/V delay

(P174)

Line dc overvoltage

Fault Flags 1L bit 7

(V369)

Gnd flt O/C

trip

(P171)

TIME

DELAY

Gnd flt O/C

delay

(P172)

Ground fault

Fault Flags 1L bit 9

(V371)

A/D

Analog input 2L

(V354)

Line

Converter

A12

TRIP

LEVEL

CALC

Idc feedback

(V322)

1.10

1.04 pu

Line O/L trip

(P163)

Line O/L delay

(P164)

0.5

Line overload

Fault flags 2 bit 0

(V371)

Line overload warning

Warning flags bit 0

(V373)

HARDWARE SOFTWARE

INTEGRATOR

Line Converter Protection

1557-UM050F-EN-P –June 2013

5-24 DESCRIPTION OF OPERATION

Machine Converter Protection

Except for the hardware overcurrent and dc link overvoltage detection, the machine converter protection is implemented entirely in software. Adjustable parameters specifying the trip level and time delay are provided for each fault. The motor current and voltage feedback are obtained as described in the motor model section. The motor speed feedback is derived by measuring the stator frequency and adding the calculated slip frequency as described in the section on speed control.

For all faults except motor overload, if the measured voltage, current, or speed exceeds the specified trip level for the specified time interval, the corresponding fault bit is set in one of the fault words and the master fault bit is set in Logic Status. For the detection of overload faults, the amount by which the square of the motor current exceeds a threshold level is integrated with time. An overload fault is declared if the output of the integrator exceeds the trip level calculated from the specified overload trip level and time. An overload warning is issued when the I2t level reaches half the trip level.

The response to a machine converter fault is exactly the same as the response to a line converter fault.

The hardware overcurrent and dc link overvoltage are special cases in that the fault detection is performed by hardware but the time delay is performed by software. The detection of the dc link overvoltage is implemented in hardware because a very fast response is required. The hardware fault detection responds to instantaneous values rather than average values as the software fault detection does. The hardware motor overcurrent detection is provided because it is required for dc link overcurrent detection on the line converter, and both converters use identical Drive Control Boards.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-25

Motor O/C trip

(P177)

I stator

(V340)

TIME

DELAY

Motor O/C delay

(P178)

Motor overcurrent

Fault Flags 1M bit 4

(V370)

Motor O/V trip

(P181)

TIME

DELAY

Motor O/V delay

(P182)

Motor overvoltage

Fault Flags 1M bit 6

(V370)

V stator

(V344)

Motor O/C trip

(P177)

I DC

TIME

DELAY

Motor O/C delay

(P178)

Mtr h/w o/c

Fault Flags 1M bit 5

(V370)

DC O/V trip

(P187)

TIME

DELAY

DC O/V delay

(P188)

Mtr dc overvoltage

Fault Flags 1M bit 7

(V370)

V DC

Gnd flt O/V

trip

(P169)

TIME

DELAY

Gnd flt O/V

delay

(P190)

Neutral overvoltage

Fault flags 2 bit 5

(V371)

V neutral

motor

(V347)

Motor O/S

trip

(P165)

TIME

DELAY

Motor O/S

delay

(P156)

Mtr overspeed

Fault flags 2 bit 2

(V371)

Speed

feedback

(V259)

HARDWARE SOFTWARE

TRIP

LEVEL

CALC

1.04 pu

Motor O/L trip

(P179)

Motor O/L delay

(P180)

0.5

Motor overload

Fault flage 2 bit 1

(V371)

Motor overload waring

Warning flags bit 1

(V373)

INTEGRATOR

I stator

(V340)

Machine Converter Protection

1557-UM050F-EN-P –June 2013

5-26 DESCRIPTION OF OPERATION

Analog Outputs

A total of twelve programmable analog outputs is provided, six on each of the two Drive Control boards. The analog outputs are 8-bit, non-isolated, with a range of -10V to +10V. The arrangement of analog outputs is different for the original Drive Control boards 80165-018 and the new 18-Pulse Drive Control boards 80190-118. For the original boards, four of the six analog outputs on each board are intended for diagnostic purposes and are available at test points for connection to an oscilloscope or chart recorder. The remaining two analog outputs on each board are intended for connection to external devices such as meters or isolation modules, and are available at the analog I/O connector on each board. With the new 18-pulse boards, the analog outputs are split equally between three diagnostic outputs and three external outputs. The allocation of the analog outputs is shown below:

No. Output Control Board 80165-018 80190-118 1 Analog output 1L Line (lower) Test point AO1 Test point AO1

2 Analog output 2L Line (lower) Test point AO2 Test point AO2 3 Analog output 3L Line (lower) Test point AO3 Test point AO3 4 Analog output 4L Line (lower) Test point AO4 Connector J8 5 Analog output 1M Machine (upper) Test point AO1 Test point AO1 6 Analog output 2M Machine (upper) Test point AO2 Test point AO2 7 Analog output 3M Machine (upper) Test point AO3 Test point AO3 8 Analog output 4M Machine (upper) Test point AO4 Connector J8 9 Analog output 5L Line (lower) Connector J5 Connector J8 10 Analog output 6L Line (lower) Connector J5 Connector J8 11 Analog output 5M Machine (upper) Connector J5 Connector J8 12 Analog output 6M Machine (upper) Connector J5 Connector J8

Any parameter or variable can be assigned to any analog output, but it should be kept in mind that the analog outputs on the two Drive Control Boards are serviced at different rates. The analog outputs on each board are updated six times per cycle, which means that the line converter outputs are updated at a fixed rate while the update rate for the machine converter varies with motor speed. The scaling of the variables assigned to the analog outputs is given in the variable descriptions and cannot be changed. However, the four or six external outputs are each provided with an adjustable offset and scale factor which are applied after the predefined scaling to allow these outputs to be rescaled to suit the external device they are driving.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-27

9.92V

-10.00V

analog

variable

D/A

Line

Converter

AO1

9.92V

-10.00V

analog

variable

D/A

Line

Converter

AO2

9.92V

-10.00V

D/A

Line

Converter

AO3

analog

variable

9.92V

-10.00V

D/A

Line

Converter

AO4

analog

variable

9.92V

-10.00V

analog

variable

D/A

Machine

Converter

AO1

9.92V

-10.00V

analog

variable

D/A

Machine

Converter

AO2

9.92V

-10.00V

D/A

Machine

Converter

AO3

analog

variable

9.92V

-10.00V

D/A

Machine

Converter

AO4

analog

variable

-10.00V

D/A

Line

Converter

AO5

analog

variable

Analog

output

(V357)

9.92V

Analog

offset 5L

(P193)

Analog

scale 5L

(P198)

-10.00V

D/A

Line

Converter

AO6

analog

variable

Analog

output

(V357)

9.92V

Analog

offset 6L

(P193)

Analog

scale 6L

(P198)

-10.00V

D/A

Line

Converter

AO5

analog

variable

Analog

output

(V357)

9.92V

Analog

offset 5L

(P193)

Analog

scale 5L

(P198)

-10.00V

D/A

Line

Converter

AO6

analog

variable

Analog

output

(V357)

9.92V

Analog

offset 6L

(P193)

Analog

scale 6L

(P198)

Analog Outputs

1557-UM050F-EN-P –June 2013

5-28 DESCRIPTION OF OPERATION

CAUTION: Application of medium voltage to the drive input or output when it is operating in gate test mode may cause severe damage to the drive.

CAUTION: It is the responsibility of the operator to ensure that the drive and motor are isolated from medium voltage when the drive is operating in system test mode with the input, output, and bypass contactors closed.

CAUTION: Open circuit test mode should not be used when the drive is connected to a load unless an output contactor is provided.

Test Modes

The Bulletin 1557 drive is provided with five test modes that are selected by parameter Test Mode in the Feature Select group. When Test Mode is set to the default value of zero, the drive is in the normal operating mode. If the value of this parameter is changed when the drive is running, the change will not take affect until the drive is stopped.

Setting Test Mode to 1 selects the gate test mode. This mode is used to check the thyristor gating with the medium voltage off. The line converter gating is at the rated line frequency but is not synchronized with the line voltage and has positive phase rotation only. The machine converter gating is the same as in normal operation. The output frequency is determined by the speed reference. Both the input and output contactors must be open and medium voltage must not be applied to the drive.

Setting Test Mode to 2 selects the dc current test mode. This mode is used to test the line converter and to tune the current regulator and the line commutating impedance. In the dc current test mode, the line converter operates normally but the machine converter gating is modified to gate both the positive and negative legs in the same phase in order to short-circuit the dc link current through the machine converter. The short circuit current is slowly rotated among the three phases with overlap between phases to ensure that an open circuit does not occur during commutation. There is no current in the motor and the output contactor must be open. The dc current command is set equal to the value specified by parameter DC Current Test Command in the Current Control Parameters group.

Setting Test Mode to 3 selects the system test mode. This mode is used to test the drive as a system, including interfaces with external devices such as programmable controllers, without applying power to the drive or motor. The drive behaves as if it was running normally but all thyristor gating is inhibited. Since the input, output, and bypass contactors operate normally in this mode, the drive cannot prevent medium voltage being applied to the drive or motor and other measures must be taken to ensure that this does not occur.

Setting Test Mode to 4 selects the open circuit test mode. This mode is used to test the drives at rated output voltage and frequency without connecting it to a motor. In open circuit test mode, ac current sufficient to produce rated voltage at the drive output is forced through the output filter capacitors. When the drive is started in this mode, it ramps up to rated frequency and synchronizes its output voltage with the line voltage. The current reference is set to a value that will produce approximately rated voltage at the drive output. The output voltage can be changed by adjusting parameter Flux Command Base Speed.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-29

CAUTION: Since the programmable controller and not the drive controls the output and bypass contactors, the transfer command must always go via the PLC and never directly to the drive from another controlling device (e.g. a Remote I/O adapter).

CAUTION: If the phase rotation and phase angle of the bypass voltage compared to the drive input voltage are not correct, severe damage may occur to the drive, motor, couplings, and driven equipment if a transfer to bypass is attempted.

Synchronous Transfer

Synchronous transfer is an optional feature of the Bulletin 1557 ac drive which allows a motor to be transferred between the drive and a fixed frequency supply in either direction without stopping and with a very short interruption of power to the motor. Compared to a simple non-synchronous transfer in which power to the motor is interrupted for a significant length of time, the transient drop in motor speed is much less with synchronous transfer.

In order to perform a synchronous or non-synchronous transfer both a drive output contactor and a bypass contactor are required. The name "bypass" indicates that the function of this contactor is to connect the motor directly to the fixed frequency supply, bypassing the drive.

Synchronous transfer also requires the optional second discrete I/O board to produce the three inputs and one output used for this function. The three inputs are the "bypass contactor closed" status input, and the "transfer to bypass" and "transfer to drive" command inputs. The one output is "close bypass contactor".

In most single motor and all multiple motor applications, a programmable controller is used for overall control of the synchronous transfer operation. Because of the risk of damage to the motor and drive if the bypass contactor is closed at the wrong time, close co-ordination is required between the drive and the programmable controller for the successful execution of a synchronous transfer. In particular, when transferring from drive to bypass, the time interval between the drive shutting off and the bypass contactor closing must be accurately controlled. Typically, the PLC gives control of the bypass contactor to the drive before performing the transfer, and takes back control after the transfer is completed.

Since the drive does not have any means of measuring the input voltage of the bypass contactor, the drive input voltage is used as the phase reference for synchronization. Independent verification of the phase rotation and phase angle of the bypass voltage relative to the drive input voltage is therefore absolutely essential.

As a precaution, a synchronous transfer will not be performed if the phase sequence of the line voltage is not positive.

1557-UM050F-EN-P –June 2013

5-30 DESCRIPTION OF OPERATION

CAUTION: If parameter Synchronous Transfer Off Delay is set incorrectly, damage may occur to the drive, motor, couplings, and driven load if a transfer to bypass is attempted.

Transfer to Bypass

When the motor is running on the drive and a synchronous transfer to bypass is required, the transfer takes place as described below:

1. Before a transfer to bypass is requested, the drive must be given control of the open bypass contactor. Since the drive is running, it will already have control of the output contactor. The "transfer to bypass", "transfer to drive", and "bypass contactor closed" inputs and the "close bypass contactor" output must all be off at this time.

2. The drive is given a "transfer to bypass" command, which must remain active until the synchronous transfer is complete. If the transfer command is removed before the bypass contactor is requested to close, the drive will abort the transfer and return to normal running. When the drive receives the transfer command, it accelerates the motor up to line frequency. If the drive is unable to achieve synchronous speed, it may be necessary to increase parameter Torque Limit Motoring.

3. When the motor reaches synchronous speed, the synchronizing regulator is activated. The synchronizing regulator adjusts the drive speed reference as required, to synchronize the motor to the line with the motor voltage leading the line voltage by an angle specified by parameter Synchronous Transfer Lead Angle. This parameter can be used to compensate for any phase difference between the bypass voltage and the drive input voltage. The response of the synchronizing regulator is controlled by parameter Synchronizing Regulator Gain. If the phase error tends to oscillate, it may be necessary to adjust parameters Synchronizing Regulator Gain or Speed Regulator Bandwidth.

4. When the phase error between the motor voltage and line voltage has remained less than the value specified by parameter Synchronizing Error Maximum for the time interval specified by parameter Synchronizing Time, the drive activates its "close bypass contactor" output. If the drive is unable to synchronize within the time specified by parameter Sync Transfer Time, the synchronous transfer is aborted.

5. After a time delay specified by parameter Synchronous Transfer Off Delay, the drive shuts off. It is very important that parameter Synchronous Transfer Off Delay is set to the correct value. This should be slightly less than the contactor closing time. If this time delay is set too short the motor voltage could drift out of phase with the bypass voltage during the time the motor is not under power, producing a large current and torque transient when the bypass contactor closes, and possibly causing protective equipment to operate. If the time delay is set too long, a drive overcurrent fault may occur because the drive is unable to control its output voltage and frequency once the bypass contactor has closed.

6. When the "bypass contactor closed" input indicates that the bypass contactor has closed, the drive deactivates the "close output contactor" output. When the output contactor opens, the drive is disconnected from the motor, leaving the output filter capacitors charged to line voltage. It may take several minutes for the capacitors to discharge.

7. Control of the closed bypass contactor is taken away from the drive.

8. The "transfer to bypass" command is removed, causing the drive to deactivate its "close bypass contactor" output. The synchronous transfer is now complete and the motor is running on bypass.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-31

Transfer to Drive

The drive must synchronize itself with the motor voltage while the motor is still running on bypass, in order to perform the transfer to drive before the motor flux decays. The output contactor must therefore be closed with the motor still connected to the line in order to pre-charge the output filter capacitors.

When the motor is running on bypass and a transfer to drive is required, the transfer takes place as described below:

1. The drive is given a "transfer to drive" command. Initially, both the "close output contactor" and "close bypass contactor" outputs will be off. When the drive receives the transfer command, it activates its "close bypass contactor" output and runs its output frequency up to rated line frequency. The programmable controller must wait for at least 2 seconds to allow the drive to ramp up to rated frequency.

2. The drive is given control of the closed bypass and open output contactors.

3. The drive is given a normal start command, which causes it to activate its "close output contactor" output.

4. After the "output contactor closed" input indicates that the output contactor has closed, there is a short delay to allow the output filter capacitors to charge. The drive then deactivates its "close bypass contactor" output.

5. When the "bypass contactor closed" input indicates that the bypass contactor has opened, the drive goes to run mode. As the drive brings the motor torque up to the level required by the load, the motor speed will drop slightly before returning to line frequency. A drop in speed is unavoidable because the drive cannot know in advance what torque will be required.

6. The "transfer to drive" command is removed. The synchronous transfer is now complete and the motor is running on the drive. The drive retains control of the output contactor for protection purposes.

1557-UM050F-EN-P –June 2013

5-32 DESCRIPTION OF OPERATION

TIME

DELAY

Slip

frequency

(V343)

Sync lead angle

(P226)

TIME

DELAY

Line flux

angle

Sync reg gain

(P225)

-3 Hz

3 Hz

SYNCXFER

REGULATOR

Syncxfer enabled

Sync spdref

to speed control

Shut off drive

close bypass

contactor

Sync off delay

(P227)

Sync time

(P229)

Sync error max

(P228)

Transfer to Drive

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-33

Thyristor Diagnostics Bulletin 1557 Drive

The Bulletin 1557 ac drive tests for open or shorted thyristors both when it is started and continuously while running. The method used to detect failed thyristors is different for starting and for running, but the same hardware is used in both situations. The drive control receives a feedback signal via a fibre optic cable from each thyristor gate driver that indicates whether the anode-cathode voltage of the thyristor is high or low. A high voltage across a thyristor indicates that it is almost certainly not conducting. A low voltage across a thyristor indicates that it may be conducting, but since it is quite normal for the voltage across a device to be low even when it is not conducting, this is not a reliable indication that the device is on.

The following description applies to all air cooled and liquid cooled 1557 drives except the small 1557M drive which does not have any feedback from its gate drivers and uses a completely different method to detect failed thyristors.

Detection of Failed Thyristors When Starting Line Converter

When line voltage is applied to the drive but it is not running (i.e. gating is off), the voltage across the line converter thyristors is high most of the time but low twice per cycle during an interval around the zero crossings of the line voltage. Shorted thyristors in the line converter can therefore be detected whenever line voltage is applied even when the gating is off. If the feedback from the gate driver indicates that the voltage across a device is continuously low for six cycles, then it is assumed to be shorted. The six cycle interval is required to eliminate spurious faults.

If the feedback from the gate driver indicates that the voltage across a device is continuously high for six cycles, then an open thyristor fault will be annunciated. Since it not possible to tell if a thyristor is actually open without gating it, an open fault at this time indicates that the feedback from the gate driver has failed.

When the drive receives a start command, a gating test of the line converter thyristors is performed. Thyristors are gated one at a time at intervals of one cycle to determine if they conduct. The one cycle delay between devices is required to allow the snubbers to recharge. A short gating pulse is applied near the point in the cycle when the voltage across the device is at its positive peak. If the voltage across the device does not collapse, then it is assumed to be open. This test can also identify errors in the connection of the fibre optic cables. An open thyristor fault at this time indicates that the thyristor or gate driver board is defective, or that the fibre optic cable is plugged into the wrong transmitter or receiver on the Optical Interface board. When two thyristors in the same leg seem to be open, it is usually because their fibre optic cables have been interchanged.

1557-UM050F-EN-P –June 2013

5-34 DESCRIPTION OF OPERATION

Machine Converter

If no open or shorted thyristors are detected, the line converter is gated at a firing angle of 90 degrees with the machine converter gating off in order to apply a voltage to the dc link. Although a firing angle of 90 degrees corresponds to an average dc voltage of zero when the dc current is continuous, with the machine converter gating off the snubber capacitors will charge up to the peak of the voltage waveform, resulting in a dc link voltage which is close to rated voltage. After a delay to allow the dc voltage to build up to its maximum value, the feedback from the GTO gate drivers is examined. If the gate driver feedback indicates that the voltage across a GTO is still low, then that device is assumed to be shorted. If all devices in one leg of the bridge are shorted, all devices in the other two legs on the same side (positive or negative) of the bridge may incorrectly appear to be shorted because they are connected in parallel with the shorted leg through the low impedance of the motor. For this reason, if the drive is indicating that a number of machine converter thyristors are shorted, all devices should be checked with an ohmmeter to confirm that they actually are shorted before replacing them.

If no shorted devices are detected, a gating test of the machine converter thyristors is performed. Thyristors are gated one at a time at intervals of 20 ms to determine if they conduct. The 20 ms delay between devices is required to allow the snubbers to recharge. Each device is gated for approximately 100 microseconds while the gate driver feedback is monitored. If the voltage across the device does not go low, then it is assumed to be open. An open thyristor fault at this time indicates that the thyristor or gate driver board is defective, or that the fibre optic cable is plugged into the wrong transmitter on the Optical Interface board. When two thyristors in the same leg seem to be open, it is usually because their fibre optic cables have been interchanged. The machine converter gating test is not included in firmware revisions earlier than 4.20.

Detection of Failed Thyristors When Running

Detection of thyristor faults is much simpler when the drive is running than when it is started because no special gating is required. When the gating is enabled for both converters, the feedback from the gate drivers is constantly switching on and off, usually several times per cycle. The gate driver feedback signals from each device are sampled a number of times during each cycle. If any of the conduction feedback signals indicates that the voltage across a thyristor is continuously high or low for six cycles then the corresponding device is assumed to be open or shorted respectively. The detection interval of six cycles, which is required to eliminate spurious faults, makes the fault detection too slow to protect thyristors from failing, but it does shut the drive off after a device has failed in order to prevent additional failures from occurring.

Drives that have an extra redundant thyristor in each leg of the bridge will issue a warning and continue running if a single device in a leg fails short, but will trip if a second device fails in the same leg.

When the drive is running, an open thyristor is treated as a warning, not a fault, because it is not possible for a device to fail open when high voltage is applied and gating is on. An open thyristor warning while running usually means that the gate driver feedback has failed.

For the line converter, the detection of open thryistors is turned off when the dc link current is discontinuous because the voltage across the device does not provide a reliable indication of its conduction state when there is no current flowing. For the machine converter, all thyristor diagnostics are turned off when the motor voltage is less than 0.25 pu because the feedback from the gate drivers is not valid at low voltage.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-35

Thyristor Diagnostics Bulletin 1557M Mini Drive

There are two differences between the Bulletin 1557M mini drive and the larger 1557 drives which affect the way thyristor failures can be detected. First, there are no thyristors connected in series, and second, there is no feedback from the gate drivers. The consequences of these differences are that the mini drive must use other feedback signals, specifically the input current and motor current, to detect open or shorted thyristors, and that failed thyristors can only be detected when the drive is started and not while it is running.

Each time the drive is started, tests are performed to detect the following thyristor failures: line converter shorted thyristor, line converter open thyristor, machine converter shorted thyristor, machine converter open thyristor. The tests are performed in the order listed, and if any failed devices are detected the remaining tests are cancelled.

Line Converter Shorted Thyristor

With the machine converter gating off, one of the six thyristors in the line converter is gated for 20 degrees at retard limit. If no devices are shorted, no current should flow. If any current is detected it indicates that the thyristor in one of the other two phases on the same side of the bridge is shorted. The test is repeated for each of the six thyristors in the line converter, and is terminated if a shorted device is found.

Line Converter Open Thyristor

For the open thyristor test, two GTOs (3 & 6) in the same phase of the machine converter are gated continuously to provide a path for dc link current which bypasses the motor. The line converter is then run briefly with the dc current below the discontinuous level. When the dc link current is discontinuous, each pair of thyristors shuts off before the next pair is gated. If no dc current is detected in two consecutive 60 degree intervals, it indicates that whichever device was gated in both those intervals did not conduct. When the test is completed, the line converter is phased back to turn off the current.

Machine Converter Shorted Thyristor

With the line converter phased back to retard limit, one of the six thyristors in the machine converter is gated. The line converter is then phased up to try to drive some current through the dc link. If no devices are shorted, no current should flow. If any current is detected, it indicates that one of the devices in the other side of the bridge is shorted. If the current flows through the motor then the shorted device must be in one of the other phases and cannot be uniquely identified. If the current does not flow through the motor then the failed device must be in the same phase as the device that is being gated. The line converter is then phased back to turn off the current. The test is repeated for each of the six thyristors in the machine converter.

The voltage across the machine side of the dc link is also measured during this test and a “No Vdc fdbk” fault is issued if no dc link voltage is detected. This usually means that the dc link voltage feedback is not connected.

Machine Converter Open Thyristor

With the line converter phased back to retard limit, both thyristors in one phase of the machine converter are gated. The line converter is then phased up to try to drive some current through the dc link. If no current is detected, it indicates that one or both devices have failed to conduct. The fault messages indicate that both devices are open, even though only one of then may be defective. This test is repeated for each of the three phases in the machine converter.

1557-UM050F-EN-P –June 2013

5-36 DESCRIPTION OF OPERATION

Flying Start

The 1557 drive is capable, with certain restrictions, of restarting a motor that is not stationary but is already rotating. This is a so-called flying start. In normal operation, the output of the drive is synchronized with the motor flux, which is derived from the stator voltage and current feedback. If there is no motor current, then whether the motor is rotating or stationary it does not generate any significant voltage and it is not possible to determine the stator frequency. If there is no detectable stator voltage the drive assumes that the motor is stationary, because this is the most likely case. Therefore, when the drive is started the frequency starts from an initial value of zero and ramps up until motor flux is detected. Significant flux is created in the motor only when the slip frequency (the difference between the stator frequency and rotor frequency) is small. When the drive is started with the motor stationary, the initial slip frequency is small and the motor flux builds up fairly quickly. But, if the motor is already spinning then very little flux will be induced until the stator frequency is quite close to the rotor frequency, at which time the motor flux will suddenly rise to a level sufficient for the drive to detect and synchronize itself to. If the drive reaches the commanded speed without detecting any motor flux then it will trip on a motor stall fault. There are four possible causes of a motor stall when starting:

1. The motor has pulled out and stalled during starting due to insufficient torque. The remedy for this is

to increase the value of some or all of the parameters “Torque command 0”, “Torque command 1”, and “Acceleration time 1”.

2. The motor was already rotating but the flying start failed because the drive passed through the low

slip region too quickly to allow the motor flux to build up. The solution to this problem is to increase

the value of parameter “Acceleration time 1”. Most medium voltage motors have a rotor time

constant in the range of 1 to 5 seconds and it can take a few seconds for the flux to rise to a detectable level. Until flux is detected, the drive does not use the normal speed ramp but continues to accelerate at the rate defined by parameters “Acceleration time 1” and “Ramp speed 1”.

3. The motor is rotating in the direction opposite to the commanded direction of rotation. The slip

frequency will increase instead of decrease as the drive accelerates and no flux will be induced in the motor.

4. The motor is rotating in the commanded direction but at a speed higher than the commanded speed.

The drive will reach the commanded speed and trip before the slip frequency is low enough to induce flux in the motor.

If the motor is coasting at a high enough speed (above about 40 Hz) and the output contactor is closed, then the motor will self excite with the drive motor filter capacitors and generate a high stator voltage that the drive can detect.

If the optional tachometer feedback is installed, then the drive knows the speed of the motor at all times and can perform a flying start for any speed or direction of rotation.

With a synchronous motor, flying start is much quicker and more reliable because a detectable stator voltage is produced whenever the field is applied and the motor is rotating, even with zero stator current. When the drive is started, rated field current is applied to the motor but the stator current remains at zero until the end of the ramp start delay to allow the rotor flux to build up. If the stator frequency is greater than about 2 Hz, sufficient stator voltage is generated to allow the drive to detect the speed and direction of the motor and synchronize itself to the motor flux. If the flux feedback does not reach the level specified by parameter Flux Minimum, the drive assumes that the motor is stationary and starts from zero frequency. If the motor is not in fact stationary but is rotating very slowly, it may fail to start. If the optional position encoder is installed, a flying start can be performed for any speed or direction of rotation.

1557-UM050F-EN-P – June 2013

DESCRIPTION OF OPERATION 5-37

Tachometer/Encoder Option

The optional tachometer/encoder provides two significant enhancements to the drive control:

1. Provides an accurate measurement of motor speed at all times

2. Extends closed loop speed and torque control down to nearly zero speed.

A pulse tachometer, also called a pulse generator or incremental encoder, produces a pulse train output with a frequency proportional to shaft speed. The optional Tachometer Feedback board provides optically isolated inputs for up to four two-phase (quadrature) pulse tachs. Parameter Tach Select determines which one of the four tach inputs is used. Single-phase tachs can be used if reverse rotation never occurs. Parameter Tach Type specifies which type is used. The Tach Feedback board contains counters that count the number of tach pulses produced during a specified time interval. Dividing the number of tach pulses by the sampling period yields the tach output frequency, from which the shaft speed can be calculated using the tach pulses per revolution (ppr) specified by parameter Tach Pulse/Rev and the number of motor poles. The shaft speed is measured six times per cycle for stator frequencies above 10 Hz, and at a fixed rate of 60 times per second for lower frequencies. This is a lower sample rate than used by most low voltage drives. The tach resolution determines the minimum motor speed that can be measured. If high starting torque or very low speed operation is required then a high resolution such as 1024 or 2048 ppr must be provided. Otherwise, a low resolution such as 240 or 360 ppr is adequate.

In order to control motor flux and torque, the machine converter gating must be synchronized with the rotor flux. Over most of the speed range, the machine converter gating is synchronized to the rotor flux signal reconstructed from the stator voltage and current feedback by analog hardware (refer to p. 5-18). Because the rotor flux is measured, this method is called direct vector control. However, the analog flux signal is not usable for stator frequencies less than about 5 Hz. To control flux and torque at low speeds, the 1557 drive switches to indirect vector control, which is widely used in low voltage drives. With indirect control the position of the rotor flux is not directly measured but is indirectly predicted by adding the calculated slip angle to the measured rotor angle. The rotor angle is obtained by integrating the output of the pulse tach (the zero position is arbitrary). The slip frequency required to provide the desired flux and torque is calculated from the d-axis and q-axis current commands and the rated slip frequency. The slip frequency is integrated to get the slip angle and added to the measured rotor angle to obtain the flux angle. Indirect control can be used at any speed but its weakness is that the calculated slip is sensitive to errors in the motor parameters. Errors in slip frequency increase the coupling between flux and torque which adversely affects the stability of the flux control. Since large motors generally have lower magnetizing current and lower slip than small motors they are more sensitive to parameter errors (i.e. a small error in slip produces a large error in torque and flux).

Because of its salient pole construction, the position of the rotor flux in a synchronous machine is not arbitrary but is determined by the physical position of the rotor. A synchronous machine therefore requires an absolute position encoder instead of an incremental encoder for indirect vector control. The encoder must also be aligned with the direct axis of the rotor. To avoid having to physically align the encoder, an offset angle specified by parameter Encoder Offset is added to the encoder output to compensate for the difference between the encoder zero and the direct axis of the rotor. Parameter Encoder Reverse is provided to reverse the encoder rotation in software if it does not match the rotation of the motor.

The encoder output must be Gray code and not normal binary. In most cases the encoder will actually have a 10 or 12-bit parallel output, but the Tach Feedback board can only accommodate 8 bits. Which 8 bits are used is determined by the number of motor poles and is shown on the electrical drawings. There is no parameter to specify the encoder resolution; it is inferred from the number of motor poles.

1557-UM050F-EN-P –June 2013

5-38 DESCRIPTION OF OPERATION

1557-UM050F-EN-P – June 2013

PARAMETER AND VARIABLE DESCRIPTIONS 6-1

Parameter and Variable Descriptions

Firmware Revisions 4.72 & 5.32

Important Notice: With the introduction of the new 18-pulse control boards, the Drive Control firmware has

been split into two parallel versions. Firmware revisions below 5.00 can only be used in the original Drive Control board 80165-108-51. Firmware revision 5.00 and above can only be used in the new 18-Pulse Drive Control board 80190-118-51. Although every effort has been made to make them as similar as possible, the two versions of firmware are definitely not interchangeable and will not function if installed in the wrong type of Drive Control board.

The drive control firmware provides over two hundred parameters and variables that are accessible to the user. Parameters are user adjustable constants such as ramp times or trip levels that are saved in nonvolatile (EE) memory when the control power is off. Variables are values such as speed reference or current feedback that cannot be changed by the user. Parameters and variables are grouped and described separately. For example, there is a group of parameters for the speed control function and there is also a separate group of variables for the speed control function.

Parameter Descriptions

The drive parameters are described in this section. The parameter descriptions are arranged in the functional groups used by the programming terminal. Each description begins with the full name of the parameter, followed by the name displayed on the programming terminal. The linear number of the parameter is given followed by the minimum and maximum values showing the position of the decimal point and the units if applicable. Next is the default value that is assigned when a parameter initialization is performed. Finally, there is a short description of the function of the parameter. Unless stated otherwise, all parameters are saved in nonvolatile memory.

1 Feature Select Parameters

Contactor Configuration [Contactor config]

Linear number: 1 Minimum value: 0 Maximum value: 7 Default value: 0 This parameter specifies the contactor configuration, specifically under what conditions the input and output contactors will be open. The possible contactor configurations specified by this parameter are:

Input Contactor Output Contactor 0 Open when not running Open when not running 1 Open for all faults Open when not running 2 Open when not running Open for all faults 3 Open for all faults Open for all faults 4 Open when not running Open when not running 5 Open for critical faults only Open when not running 6 Open when not running Open for all faults 7 Open for critical faults only Open for all faults

Critical faults are line overcurrent, DC link overcurrent, and line overvoltage. If an input or output contactor is not provided, the "close contactor" discrete output should be connected to the corresponding "contactor closed" discrete input.

Provision for keeping the contactors closed for all except critical faults was added in Rev 4.40/5.10.

1557-UM050F-EN-P – June 2013

6-2 PARAMETER AND VARIABLE DESCRIPTIONS

Automatic Restart Delay [Auto restart dly]

Linear number: 3 Minimum value 0.000 sec Maximum value: 10.000 sec Default value: 0.000 sec This parameter specifies the time interval after a line voltage outage during which the drive will automatically restart if the line voltage is restored, assuming that the drive was running at the time of the outage. The drive will restart only if control power is maintained during the outage.

Test Mode [Test mode]

Linear number: 4 Minimum value 0 Maximum value: 4 Default value: 0 This parameter specifies the drive test mode. It is not saved and is set to zero at power up. If this parameter is changed when the drive is running, the change will not take effect until the drive is stopped.

0 normal operating mode 1 gate test mode (medium voltage off) 2 dc current test mode 3 system test mode 4 open circuit test mode

Refer to Chapter 5 for a description of the test modes.

Speed Command Select 0 [Spd cmd select 0]

Linear number: 6 Minimum value 1 Maximum value: 15 Default value: 1 This parameter specifies the speed command that is selected when parameter Speed Command Select has a value of 1. The 11 possible sources of speed command that can be selected by this parameter are:

1 Speed Command 0 (analog input 1L) 2 Preset Speed Command 1 3 Preset Speed Command 2 4-8 Preset Speed Command 3 9 Speed Command 8 (analog input 1M) 10 SCANport adapter 1 (Communications Processor board Port 1) 11 SCANport adapter 2 (Communications Processor board Port 2) 12 SCANport adapter 3 (not used) 13 SCANport adapter 4 (not used) 14 SCANport adapter 5 (not used) 15 SCANport adapter 6 (1336-GM1 RI/O adapter)

This parameter was added in Rev 4.62/5.11 and replaces parameter Default Speed Command Select.

Speed Command Select 8 [Spd cmd select 8]

Linear number: 9 Minimum value 1 Maximum value: 15 Default value: 9 This parameter specifies the speed command that is selected when parameter Speed Command Select has a value of 9. The possible sources of speed command that can be selected by this parameter are the same as parameter Speed Command Select 0.

This parameter was added in Rev 4.62/5.11.

1557-UM050F-EN-P – June 2013

PARAMETER AND VARIABLE DESCRIPTIONS 6-3

Speed Command Select [Speed cmd select]

Linear number 7 Minimum value: 0 Maximum value: 15 Default value: N/A This parameter specifies the source of the drive speed command. It is not saved and is set to either 1 (Local) or 9 (Remote) at power up depending on the state of the Local/Remote digital input. The 11 possible sources of speed command that can be selected by this parameter are:

0 none 1 Speed Command Select 0 (Local) 2 Preset Speed Command 1 3 Preset Speed Command 2 4-8 Preset Speed Command 3 9 Speed Command Select 8 (Remote) 10 SCANport adapter 1 (Communications Processor board Port 1) 11 SCANport adapter 2 (Communications Processor board Port 2) 12 SCANport adapter 3 (not used) 13 SCANport adapter 4 (not used) 14 SCANport adapter 5 (not used) 15 SCANport adapter 6 (1336-GM1 RI/O adapter)

Reverse Enable [Reverse enable]

Linear number: 8 Minimum value: 0 Maximum value: 1 Default value: 0 (Off) This parameter is used to prevent the drive from running in the reverse direction. When this parameter is set to zero, the commanded direction of rotation is always forward.

Note that this does not prevent reverse rotation if the load overpowers the drive.

Input Contactor Opening Delay [Input open delay]

Linear number: 10 Minimum value: 0.0 min. Maximum value: 57.0 min. Default value: 0.0 min. This parameter specifies the time delay between the drive shutting off, and the input contactor opening, if the contactor is configured to open when the drive is not running. The purpose of this delay is to keep a harmonic filter energized if the drive is stopped for a short time, and not have to wait for the filter capacitors to discharge before restarting.

Parameter Level [Parameter level]

Linear number: 13 Minimum value: 0 Maximum value: 3 Default value: 2 This parameter specifies which of the parameters and variables are visible: 0 Minimum 1 Standard 2 Full 3 Development

Parameters that are not visible are set to their default value. If this parameter is changed, the new value will not take effect until the control power is turned off and on.

This parameter was added in Rev 5.00 and is not present in 4.xx.

1557-UM050F-EN-P – June 2013

6-4 PARAMETER AND VARIABLE DESCRIPTIONS

Drive Control Firmware Revision Number [Drive contrl FRN]

Linear number: 15 Minimum value: 0.00 Maximum value: 99.99 Default value: N/A This parameter specifies the revision of firmware installed in the Drive Control boards. Changing the value of this parameter has no effect.

Prior to Rev 4.60/5.10, this parameter was called simply “Firmware Revision”.

Communications Processor Firmware Revision Number [Comm proc FRN]

Linear number: 16 Minimum value: 0.00 Maximum value: 99.99 Default value: N/A This parameter specifies the revision of firmware installed in the Communications Processor board. Changing the value of this parameter has no effect.

This parameter was added in Rev 4.60/5.10.

2 Nameplate Parameters

Rated Line Frequency [Rated line freq]

Linear number: 17 Minimum value: 50 Hz Maximum value: 60 Hz Default value: 60 Hz This parameter specifies the rated frequency of the drive, and must be set to either 50 Hz or 60 Hz.

Capacitor kvar [Capacitor kvar]

Linear number: 20 Minimum value: 1 kvar Maximum value: 7500 kvar Default value: 100 kvar This parameter specifies the total three phase nameplate kvar of the motor filter capacitors.

Capacitor Volts [Capacitor volts]

Linear number: 21 Minimum value: 1000 V Maximum value: 10000 V Default value: 2400 V This parameter specifies the nameplate voltage rating of the motor filter capacitors. If the rated capacitor voltage is less than the rated motor voltage then the drive assumes that the capacitors are connected in wye and multiplies the rated capacitor voltage by 3. Otherwise the drive assumes that the capacitors are connected in delta and uses this parameter unchanged.

Prior to Rev 4.60/5.10, this parameter specified line to line rated voltage regardless of the capacitor connection.

1557-UM050F-EN-P – June 2013

PARAMETER AND VARIABLE DESCRIPTIONS 6-5

Capacitor Frequency [Capacitor freq]

Linear number : 28 Minimum value: 50 Hz Maximum value: 60 Hz Default value: 60 Hz This parameter specifies the rated nameplate frequency of the motor filter capacitors (50 Hz or 60 Hz). This parameter has been included to eliminate the requirement to recalculate the capacitor kvar when the capacitor rated frequency is not the same as line frequency.

Rated Motor Volts [Rated motor volt]

Linear number: 22 Minimum value: 1000 V Maximum value: 7200 V Default value: 2300 V This parameter specifies the rated line to line voltage of the motor. It is used along with the known divider ratios of the voltage feedback boards to calculate the motor voltage feedback scaling. 1.0 per unit voltage is defined as equal to this parameter.

The motor rated voltage should be specified as 2300/4000V and not 2400/4160V to ensure that the line voltage is slightly higher than the motor voltage. Since the motor voltage is limited by the line voltage, increasing the motor rated voltage in an attempt to get more out of the drive will only force the drive to go into field weakening at a lower speed.

Rated Motor Amps [Rated motor amps]

Linear number: 23 Minimum value: 10 A Maximum value: 1000 A or 1400 A (FRN 5.30) Default value: 60 A This parameter specifies the rated full load current of the motor. 1.0 per unit current is defined as equal to this parameter multiplied by the service factor parameter. If, as often happens, the motor rated current for a service factor of 1.0 is entered, and it is later determined that the motor is undersized and it is necessary to operate at a higher service factor, it is better to change the service factor parameter instead of this parameter. Changing the motor rated current changes the base impedance of the motor, meaning that the drive must be retuned.

Rated Motor kw [Rated motor kw]

Linear number: 24 Minimum value: 30 kw Maximum value: 7500 kw or 10000 kw (FRN 5.30) Default value: 187 kw This parameter specifies the rated power of the motor. This parameter and the following parameter are actually the same parameter with different scaling. Either parameter may be set and the other will automatically change to the corresponding value in the alternative units.

Rated Motor hp [Rated motor hp]

Linear number: 25 Minimum value: 40 hp Maximum value: 10000 hp or 13400 hp (FRN 5.30) Default value 250 hp This parameter specifies the rated power of the motor. This parameter and the preceding parameter are actually the same parameter with different scaling. Either parameter may be set and the other will automatically change to the corresponding value in the alternative units.

1557-UM050F-EN-P – June 2013

6-6 PARAMETER AND VARIABLE DESCRIPTIONS

Rated Motor rpm [Rated motor rpm]

Linear number: 26 Minimum value: 150.0 rpm Maximum value: 3600.0 rpm Default value: 1185.0 rpm This parameter specifies the rated full load speed of the motor in rpm. It is equal to synchronous speed for a

synchronous motor and slightly less than synchronous speed for an induction motor. A “rated rpm” warning will

be displayed if this parameter is entered incorrectly.

Rated Motor Frequency [Rated motor freq]

Linear number: 29 Minimum value: 40 Hz Maximum value: 90 Hz Default value: 60 Hz This parameter specifies the frequency corresponding to the rated motor rpm specified by the previous parameter. It is included for the situation in which the motor rated frequency is not the same as the line rated frequency (e.g. a 60 Hz motor on a 50 Hz supply). The rated frequency of the drive is still the rated line frequency.

Motor Type [Motor type]

Linear number: 30 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the type of motor connected to the drive. 0 induction (asynchronous) 1 synchronous

This parameter was added in Rev 5.00 and is not present in 4.xx.

Drive Type [Drive type]

Linear number: 32 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the type of drive. 0 Bulletin 1557 (all versions) 1 Powerflex 7000

This parameter was added in Rev 5.30 and is not present in 4.xx.

Link Inductance [Link inductance]

Linear number: 27 Minimum value: 1.0 mH Maximum value: 600.0 mH Default value: 64.0 mH This parameter specifies the nameplate value of the dc link inductor in mH (total for both coils).

Service Factor [Service Factor]

Linear number: 31 Minimum value: 0.75 Maximum value: 1.25 Default value: 1.0 This parameter specifies the service factor of the motor. Because the motor parameters are normalized to the service factor, changing this parameter allows the motor rating to be changed without affecting the drive tuning.

This parameter was added in Rev 4.55/5.00.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-7

3 Speed Command Parameters

Preset Speed Command 1-3 [Preset speed 1-3]

Linear numbers: 33-35 Minimum value: 0.5 Hz Maximum value: 90.0 Hz Default values: 30.0/40.0/50.0 Hz These three parameters specify preset speed commands that can be selected by the logic command word.

Preset Jog Speed [Preset jog speed]

Linear number: 40 Minimum value: 1 Hz Maximum value: 60 Hz Default value: 6.0 Hz This parameter specifies the preset jog speed command, which is selected by the logic command word.

Speed Command 0 Minimum [Speed cmd 0 min]

Linear number: 41 Minimum value: -127.0 Hz Maximum value: 127.0 Hz Default value: 6.0 Hz This parameter specifies the value of speed command corresponding to 0.00V on analog input 1L. The required value can be calculated using the following formula:

Speed cmd 0 min = fmin - [vmin x (fmax-fmin) / (vmax-vmin)] fmin is the minimum operating speed fmax is the maximum operating speed vmin is the voltage corresponding to minimum operating speed vmax is the voltage corresponding to maximum operating speed

Speed Command 0 Maximum [Speed cmd 0 max]

Linear number: 42 Minimum value: 0.0 Hz Maximum value: 127.0 Hz Default value: 60.0 Hz This parameter specifies the value of speed command corresponding to 10.00V on analog input 1L. It may be less than Speed Command 0 Minimum. The required value can be calculated using the following formula: Speed cmd 0 max = fmin + [(10V-vmin) x (fmax-fmin) / (vmax-vmin)]

The terms are as defined in the description of parameter Speed Command 0 Minimum.

Speed Command 8 Minimum [Speed cmd 8 min]

Linear number: 43 Minimum value: -127.0 Hz Maximum value: 127.0 Hz Default value: 6.0 Hz This parameter specifies the value of speed command corresponding to 0.00V on analog input 1M. The required value can be calculated as described for parameter Speed Command 0 Minimum.

Speed Command 8 Maximum [Speed cmd 8 max]

Linear number: 44 Minimum value: 0.0 Hz Maximum value: 127.0 Hz Default value: 60.0 Hz This parameter specifies the value of speed command corresponding to 10.00V on analog input 1M. It may be less than Speed Command 8 Minimum. The required value can be calculated as described for parameter Speed Command 0 Maximum.

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6-8 PARAMETER AND VARIABLE DESCRIPTIONS

Speed Command 9 Minimum [Speed cmd 9 min]

Linear number: 45 Minimum value: 127.0 Hz Default value: 6.0 Hz This parameter specifies the value of speed command corresponding to a digital speed command input of 0. The required value can be calculated using the following formula:

Speed cmd 9 min = fmin + [vmin x (fmax-fmin) / (vmax-vmin)] fmin is the minimum operating speed fmax is the maximum operating speed vmin is the value corresponding to minimum operating speed vmax is the value corresponding to maximum operating speed

Speed Command 9 Maximum [Speed cmd 9 max]

Linear number: 46 Minimum value: 0.0 Hz Maximum value: 127.0 Hz Default value: 60.0 Hz This parameter specifies the value of speed command corresponding to a digital speed command input of

32767. It may be less than Speed Command 9 Minimum. The required value can be calculated using the

following formula: Speed cmd 9 max = fmin + [(32767-vmin) x (fmax-fmin) / (vmax-vmin)] The terms are as defined in the description of parameter Speed Command 9 Minimum.

Speed Command Minimum [Speed cmd min]

Linear number: 47 Minimum value: 1.0 Hz Maximum value: 75.0 Hz Default value: 6.0 Hz This parameter specifies the minimum value of the speed command. When the drive is running, the absolute value of the speed command will not be less than this value regardless of the other parameter settings (except for Speed Command Maximum).

Speed Command Maximum [Speed cmd max]

Linear number: 48 Minimum value: 1.0 Hz Maximum value: 75.0 Hz Default value: 60.0 Hz This parameter specifies the maximum value of the speed command. The absolute value of the speed command will not be greater than this value regardless of the other parameter settings (including Speed Command Minimum).

4 Skip Speed Parameters

Skip Speed 1-4 [Skip speed 1-4]

Linear numbers: 49-52 Minimum value: 6.0 Hz Maximum value: 90.0 Hz Default value: 90.0 Hz These four parameters specify the center of the skip speed zones.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-9

Skip Speed Band 1-4 [Skip spd band 1-4]

Linear numbers: 53-56 Minimum value: 0.0 Hz Maximum value: 2.0 Hz Default value: 0.0 Hz These four parameters specify the width of the skip speed zones.

5 Speed Ramp Parameters

Acceleration Time 1 [Accel time 1]

Linear number: 65 Minimum value: 0 sec Maximum value: 999 sec Default value: 5 sec This parameter specifies the time for the speed reference to increase from zero to Ramp Speed 1.

Acceleration Time 2 [Accel time 2] Linear number: 66 Minimum value: 0 sec Maximum value: 999 sec Default value: 3 sec This parameter specifies the time for the speed reference to increase from Ramp Speed 1 to Ramp Speed 2.

Acceleration Time 3 [Accel time 3] Linear number: 67 Minimum value: 0 sec Maximum value: 999 sec Default value: 14 sec This parameter specifies the time for the speed reference to increase from Ramp Speed 2 to Ramp Speed 3.

Acceleration Time 4 [Accel time 4] Linear number: 68 Minimum value: 0 sec Maximum value: 999 sec Default value: 3 sec This parameter specifies the time for the speed reference to increase from Ramp Speed 3 to Ramp Speed 4.

Deceleration Time 1 [Decel time 1]

Linear number: 69 Minimum value: 0 sec Maximum value: 999 sec Default value: 3 sec This parameter specifies the time for the speed reference to decrease from Ramp Speed 1 to zero.

Deceleration Time 2 [Decel time 2] Linear number: 70 Minimum value: 0 sec Maximum value: 999 sec Default value: 3 sec This parameter specifies the time for the speed reference to decrease from Ramp Speed 2 to Ramp Speed 1.

Deceleration Time 3 [Decel time 3] Linear number: 71 Minimum value: 0 sec Maximum value: 999 sec Default value: 14 sec This parameter specifies the time for the speed reference to decrease from Ramp Speed 3 to Ramp Speed 2.

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6-10 PARAMETER AND VARIABLE DESCRIPTIONS

Deceleration Time 4 [Decel time 4] Linear number: 72 Minimum value: 0 sec Maximum value: 999 sec Default value: 3 sec This parameter specifies the time for the speed reference to decrease from Ramp Speed 4 to Ramp Speed 3.

Ramp Speed 1 [Ramp speed 1]

Linear number: 73 Minimum value: 5.0 Hz Maximum value: 6.0 Hz Default value: 5.0 Hz This parameter specifies the first break point in the speed ramp and also the speed at which the drive switches between starting mode and normal running mode. THIS PARAMETER IS SET AT THE FACTORY AND

SHOULD NOT BE CHANGED WITHOUT CONSULTING THE FACTORY.

Ramp Speed 2 [Ramp speed 2] Linear number: 74 Minimum value: 5.0 Hz Maximum value: 100.0 Hz Default value: 12.0 Hz This parameter specifies the second break point in the speed ramp. It must be greater than Ramp Speed 1.

Ramp Speed 3 [Ramp speed 3] Linear number: 75 Minimum value: 5.0 Hz Maximum value: 100.0 Hz Default value: 54.0 Hz This parameter specifies the third break point in the speed ramp. It must be greater than Ramp Speed 2.

Ramp Speed 4 [Ramp speed 4] Linear number: 76 Minimum value: 5.0 Hz Maximum value: 100.0 Hz Default value: 60.0 Hz This parameter specifies the fourth break point in the speed ramp. It must be greater than Ramp Speed 3.

Coast Speed [Coast speed] Linear number: 77 Minimum value: 2 Hz Maximum value: 100 Hz Default value: 2 Hz This parameter specifies the speed at that the drive shuts off and coasts when stopping.

Ramp Start Delay [Ramp start delay]

Linear number: 78 Minimum value: 1 sec Maximum value: 10 sec Default value: 3 sec This parameter specifies the time the speed reference remains at zero after the drive is started. The purpose of the delay is to allow flux to be established in the motor before attempting to accelerate. If the torque required at starting is very low then this parameter can be set to a small value such as 1 second, but should be set to a higher value if high starting torque is required. This parameter is active even when tach feedback is enabled.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-11

Ramp Test Step [Ramp test step]

Linear number: 80 Minimum value: 0.0 Hz Maximum value: 30.0 Hz Default value: 0.0 Hz This parameter specifies the magnitude of the step that is added to the speed command to demonstrate the response of the speed ramp. If this parameter is set to a non zero value, the drive will continuously ramp up and down between a maximum speed equal to the speed command plus the value of this parameter, and a minimum value equal to the speed command minus the value of this parameter. The ramp test function is intended to be used in factory test only. This parameter is not saved and is initialized to zero at power up.

6 Speed Control Parameters

Speed Regulator Bandwidth [Spdreg bandwidth]

Linear number: 81 Minimum value: 0.5 r/s Maximum value: 5.0 r/s Default value: 1.0 r/s This parameter specifies the small signal bandwidth of the speed control loop. It is used in the calculation of the speed regulator gains. This parameter affects only the response time of the speed regulator and not the overshoot. The speed regulator bandwidth will automatically be reduced to limit the bandwidth-inertia product to a maximum of 30.

Total inertia [Total inertia]

Linear number: 82 Minimum value: 0.10 sec Maximum value: 100.00 sec Default value: 1.00 sec This parameter specifies the total inertia of the motor and load, which is defined as the time required to accelerate to rated speed at rated torque. This parameter replaces the mechanical time constant parameter used in firmware revisions prior to 4.00. When upgrading the firmware, either the speed regulator should be retuned or the inertia can be calculated using the following relationship between the old and new parameters:

Total inertia = 1.47 X T mechanical

Torque Rate Limit [Trq rate limit]

Linear number: 83 Minimum value: 0.00 Maximum value: 60.00 Default value: 10.00 This parameter specifies the maximum change allowed in the torque command in one second. The purpose of this parameter is to prevent rapid changes in motor torque that might damage shafts and couplings. A value of

1.00 corresponds to rated motor torque in one second. Setting the torque rate limit too low will cause the

speed regulator to overshoot.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit per cycle and was a much smaller number.

Torque Limit Motoring [Trq lmt motoring]

Linear number: 84 Minimum value: 0.00 Maximum value: 1.50 Default value: 1.00 This parameter specifies the maximum value of the torque command when motoring. A value of 1.00 corresponds to rated motor torque.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

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6-12 PARAMETER AND VARIABLE DESCRIPTIONS

Torque Limit Braking [Trq lmt braking]

Linear number: 85 Minimum value: 0.00 Maximum value: 1.50 Default value: 0.80 This parameter specifies the maximum value of the torque command when braking or generating. A value of

1.00 corresponds to rated motor torque.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

Torque Command 0 [Trq command 0]

Linear number: 86 Minimum value: 0.00 Maximum value: 1.50 Default value: 0.15 This parameter specifies the value of the torque command at zero speed used in starting mode. It may be higher or lower than Torque Command 1. If this parameter is set too low the motor may not start. If it is set too high the start will be excessively rough and noisy. A value of 1.00 corresponds to rated motor torque. This parameter has no effect if the optional tach feedback is enabled.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

Torque Command 1 [Trq command 1]

Linear number: 87 Minimum value: 0.00 Maximum value: 1.50 Default value: 0.15 This parameter specifies the value of the torque command at Ramp Speed 1 and above used in starting mode. It may be higher or lower than Torque Command 0. In starting mode, the torque command changes linearly from Torque Command 0 at zero speed to Torque Command 1 at Ramp Speed 1. When the drive switches from starting mode to normal running mode and the speed regulator is released, the torque command is initially equal to the value of this parameter. If it is set too low the motor may stall before the speed regulator has time to increase the torque command. If it is set too high, the motor will accelerate very rapidly after the transition until the speed regulator is able to decrease the torque command to the value required to follow the speed ramp. A value of 1.00 corresponds to rated motor torque. This parameter has no effect if the optional tach feedback is enabled.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

Speed Reference Step [Speed ref step]

Linear number: 88 Minimum value: 0.0 Hz Maximum value: 2.0 Hz Default value: 0.0 Hz This parameter specifies the magnitude of the step that is added to the speed error to demonstrate the step response of the speed loop. It is not saved and is initialized to zero at power up.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-13

Speed Feedback Mode [Speed fdbk mode]

Linear number: 89 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the type of speed feedback used. 0 stator frequency with slip compensation 1 tachometer/encoder

The drive automatically switches to stator frequency feedback when a tach loss fault occurs. If the tach loss fault is successfully cleared the drive switches back to tach feedback mode.

Torque Control Mode [Trq control mode]

Linear number: 90 Minimum value: 0 Maximum value: 5 Default value: 1 This parameter specifies the torque control mode.

0 zero torque 1 speed regulator 2 external torque command 3 speed regulator with external positive torque limit 4 speed regulator with external negative torque limit 5 sum of speed regulator and external torque command

Torque Command External [Trq command ext]

Linear number: 91 Minimum value: -1.500 Maximum value: 1.500 Default value: 0.000 The function of this parameter depends on the torque control mode:

0 not used 1 not used 2 torque command 3 positive torque limit 4 negative torque limit 5 torque command

A value of 1.00 corresponds to rated motor torque. Note that motoring torque is positive for forward rotation and negative for reverse rotation.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

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6-14 PARAMETER AND VARIABLE DESCRIPTIONS

Torque Command Minimum [Trq command min]

Linear number: 92 Minimum value: 0.00 Maximum value: 1.50 Default value: 1.50 This parameter specifies the minimum initial value of the torque reference when the speed regulator is enabled. When starting a drive without tach feedback, the actual motor torque is measured and the torque reference is set to an appropriate value before enabling the speed regulator. This is intended to reduce the speed overshoot that can occur when Torque Command 1 is set too high. A value of 1.00 corresponds to rated motor torque. This parameter has no effect when tach feedback is enabled.

The default setting disables this load dependent initialization of the torque reference. If this starting torque

adjustment function is required, “Torque Command Minimum” should be set to a value lower than “Torque

Command 1”.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

Speed Error Deadband [Spd err deadband]

Linear number: 93 Minimum value: 0.0 Hz Maximum value: 5.0 Hz Default value: 0.0 Hz This parameter specifies a deadband for the speed regulator error. If the absolute value of the speed error is less than the value of this parameter, the output of the speed regulator will not change. This parameter is intended to be used only in torque control mode 5, and should be left at its default value of zero in all other torque control modes.

Speed Feedback Filter [Spd fdbk filter]

Linear number: 110 Minimum value: 0 r/s Maximum value: 50 r/s Default value: 0 r/s This parameter specifies the bandwidth of a second order low pass filter for the motor speed feedback. The purpose of this filter is to attenuate any undesirable components, such as mechanical resonant frequencies, in the speed feedback. Normally, this parameter should be left at its default value of zero, which automatically selects a filter bandwidth equal to ten times the speed regulator bandwidth. At this setting, the filter will have no noticeable affect on the response of the speed regulator, but as the filter bandwidth decreases below this value, the speed regulator becomes more underdamped until it eventually becomes unstable.

This parameter was added in Rev 4.60/5.10.

Torque Rate Limit 0 [Trq rate limit 0]

Linear number: 111 Minimum value: 0.00 Maximum value: 60.00 Default value: 1.00 This parameter specifies the maximum change allowed in the torque command in one second during open loop starting. The purpose of this parameter is to allow torque to be applied slowly when starting to avoid exciting the torsional natural frequency of the mechanical system. This parameter is used only during open loop starting. The normal Torque Rate Limit parameter is used when running and when starting with the optional tach feedback enabled.

This parameter was added in Rev 4.72/5.20

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PARAMETER AND VARIABLE DESCRIPTIONS 6-15

7 Flux Control Parameters

Flux Regulator Bandwidth [Flxreg bandwidth]

Linear number: 97 Minimum value: 1 r/s Maximum value: 30 r/s Default value: 10 r/s This parameter specifies the small signal bandwidth of the flux control loop. It is used in the calculation of the flux regulator gain. The maximum bandwidth possible for stable flux control tends to decrease as motor size increases.

Base Speed [Base speed] Linear number: 98 Minimum value: 30.0 Hz Maximum value: 100.0 Hz Default value: 60.0 Hz This parameter specifies the frequency at which field weakening begins. Base Speed is normally set equal to the rated frequency of the motor. It can be set to a lower value only if the motor is specially designed to operate at a higher than normal flux level without saturating.

Flux Command Base Speed [Flx cmd base spd]

Linear number: 100 Minimum value: 0.300 pu Maximum value: 1.500 pu Default value: 0.900 pu This parameter specifies the value of the flux command at base speed and rated load. The flux command will never be greater than this parameter, which can be set manually or by autotuning.

Flux Reference Step [Flx ref step]

Linear number: 102 Minimum value: 0.000 pu Maximum value: 0.100 pu Default value: 0.000 pu This parameter specifies the magnitude of the step that is added to the flux reference to demonstrate the step response of the flux loop. It is not saved and is initialized to zero at power-up.

Flux Command No Load [Flx Cmd no load]

Linear number: 103 Minimum value: 0.300 pu. Maximum value: 1.500 pu Default value: 0.700 pu This parameter specifies the value of the flux command at no load. The flux command will change linearly from Flux Command No Load to Flux Command Base Speed as Torque Reference changes from 0.00 to 1.00. Reducing the motor flux improves efficiency when running for extended periods at less than full load. The maximum torque capability of the drive is reduced in proportion to the reduction in flux. If the load increases suddenly when the drive is running with reduced flux, there may be a large drop in speed until the flux can be restored to its normal level. If Flux Command No Load is set higher than Flux Command Base Speed, the flux command will not vary with load.

Note: For Bulletin 1557M drives, this parameter is internally limited to 0.600 pu maximum.

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6-16 PARAMETER AND VARIABLE DESCRIPTIONS

If Command Bandwidth [If cmd bandwidth]

Linear number: 104 Minimum value: 0.1 r/s Maximum value: 10.0 r/s Default value: 1.0 r/s This parameter specifies the bandwidth of the field current command for synchronous motors. It should be set to a value that is less than the bandwidth of both the flux regulator and the field current control.

This parameter was added in Rev 5.00 and is not present in 4.xx.

Icd Command Gain [Icd command gain]

Linear number: 105 Minimum value: 0.0 Maximum value: 1.0 Default value: 0.5 This parameter specifies the gain of the capacitor current compensation for synchronous motors. When this parameter is set to its minimum value of 0.0, all the current for the motor filter capacitor is supplied by the drive. The line current is higher than the motor current and the motor operates at approximately unity power factor. When this parameter is set to its maximum value of 1.0, all the current for the motor filter capacitor is supplied by the motor. The line current is less than the motor current and the motor operates at a lagging power factor with reduced field current. When this parameter is set to its default value of 0.5, approximately half the motor filter capacitor current is supplied by the drive and half by the motor. The line current and the motor current are approximately equal and the motor power factor is slightly lagging. This parameter is not used for induction motors.

This parameter was added in Rev 5.10 and is not present in 4.xx.

8 Current Control Parameters

Current Regulator Bandwidth [Curreg bandwidth]

Linear number: 113 Minimum value: 0 r/s Maximum value: 400 r/s Default value: 200 r/s This parameter specifies the small signal bandwidth of the current control loop. It is used in the calculation of the current regulator gain. This parameter affects only the response time of the current regulator and not the overshoot. It is normally set to 200 radian/second.

DC Link Inductance [L DC link]

Linear number: 114 Minimum value: 0.00 pu Maximum value: 10.0 pu Default value: N/A This parameter specifies the per unit dc link inductance calculated from the nameplate link inductance and the voltage and current ratings of the drive. It is not saved and is recalculated when any of the parameters affecting its value are changed.

DC Link Time Constant [T DC link]

Linear number: 115 Minimum value: 0.010 sec Maximum value: 0.100 sec Default value: 0.040 sec This parameter specifies the time constant of the dc current regulator. It affects both the response time and overshoot of the regulator, and should be adjusted to produce a step response that has zero or a very small overshoot. This parameter can be set manually or by autotuning.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-17

Commutation Inductance [L commutation]

Linear number: 117 Minimum value: 0.00 pu Maximum value: 0.50 pu Default value: 0.10 pu This parameter specifies the commutating inductance of the line converter. This is roughly equal to the impedance of the supply, including the isolating transformer if present, expressed in the per unit system of the drive. The commutating inductance is used in the hardware reconstruction of the line voltage to compensate for commutation notches. It is also used in the calculation of the retard limit for the line converter. This parameter can be set manually or by autotuning.

DC Current Test Command [Idc command test]

Linear number: 119 Minimum value: 0.000 pu Maximum value: 1.000 pu Default value: 0.000 pu This parameter specifies the value of the dc current command when the drive is operating in dc current test mode. It is not saved and is initialized to zero at power up.

DC Current Reference Step [Idc ref step]

Linear number: 120 Minimum value: 0.000 pu Maximum value: 1.000 pu Default value: 0.000 pu This parameter specifies the magnitude of the step that is added to the dc current command to demonstrate the step response of the current loop. It is not saved and is initialized to zero at power-up.

9 Motor Model Parameters

Stator Resistance [R stator]

Linear number: 129 Minimum value: 0.00 pu Maximum value: 0.20 pu Default value: 0.00 pu This parameter specifies the per unit stator resistance of the motor. It is used in the calculation of the stator voltage and in the hardware reconstruction of the rotor flux. Stator resistance is usually less than 0.01 pu unless the motor is very small or the motor cables are very long. This parameter can be set manually or by autotuning.

Warning: An excessively high stator resistance may cause the drive to become unstable at low speed high load.

Total Leakage Inductance [L total leakage] Linear number: 130 Minimum value: 0.00 pu Maximum value: 0.74 pu Default value: 0.20 pu This parameter specifies the per unit total leakage, short circuit, or transient inductance (Ls') of the motor. It is approximately equal to the sum of the stator and rotor leakage inductance’s, and the cable inductance, and has a typical value of 0.20 pu. The leakage inductance parameter is used in the calculation of the stator voltage and in the hardware reconstruction of the rotor flux. This parameter can be set manually or by autotuning.

Warning: An excessively high leakage inductance may cause the drive to become unstable at high speed high load.

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6-18 PARAMETER AND VARIABLE DESCRIPTIONS

Magnetizing Inductance [L magnetizing]

Linear number: 131 Minimum value: 1.00 pu Maximum value: 15.00 pu Default value: 4.00 pu This parameter specifies the per unit motor magnetizing inductance. Typical values of this parameter are in the range 2.0 pu to 6.0 pu for induction motors and 1.0 pu to 2.0 pu for synchronous motors. Magnetizing inductance can change significantly with changes in load and flux. This parameter can be set manually or by autotuning.

Rotor Time Constant [T rotor]

Linear number: 132 Minimum value: 0.10 sec Maximum value: 10.00 sec Default value: 1.00 sec This parameter specifies the rotor time constant of the motor. Typical values are in the range 1.0 to 2.0 sec. The rotor time constant varies significantly with rotor temperature (due to the change in rotor resistance), which has some effect on the response of the flux regulator and the calculation of the slip frequency for induction motors. This parameter can be set manually or by autotuning.

Filter Capacitor [Filter capacitor]

Linear number: 133 Minimum value: 0.00 pu Maximum value: 2.00 pu Default value: 0.42 pu This parameter specifies the per unit effective motor filter capacitance calculated from the capacitor nameplate parameters and the voltage rating of the motor. It is not saved and is recalculated when any of the parameters affecting its value are changed. The normal range for this parameter is 0.40 to 0.60 pu. A warning will be displayed if this parameter is outside the range of 0.25 to 0.75 pu.

Magnetizing Inductance Measured [L magn measured]

Linear number: 134 Minimum value: 1.00 pu Maximum value: 15.00 pu Default value: N/A This parameter represents the motor magnetizing inductance measured by the drive control. It is obtained by dividing the measured flux feedback by the magnetizing current. This parameter is not saved and is continuously recalculated.

Lmd [Lmd]

Linear number: 135 Minimum value: 0.00 pu Maximum value: 10.00 pu Default value: 1.00 pu This parameter specifies the d-axis magnetizing inductance for synchronous motors. It can be set manually or by autotuning. This parameter is not used for induction motors.

This parameter was added in Rev 5.10 and is not present in 4.xx.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-19

10 Converter Parameters

Series Thyristor Line [Series thy line]

Linear number: 145 Minimum value: 1 Maximum value: 6 Default value: 1 This parameter specifies the number of series thyristors in each of the 6 legs of the line converter.

Series Thyristor Motor [Series thy motor]

Linear number: 146 Minimum value: 1 Maximum value: 6 Default value: 1 This parameter specifies the number of series GTO thyristors in each of the 6 legs of the machine converter.

Redundant Thyristor Line [Redundt thy line]

Linear number: 147 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the number of redundant thyristors in each of the 6 legs of the line converter.

Redundant Thyristor Motor [Redundt thy mtr]

Linear number: 148 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the number of redundant GTO thyristors in each of the 6 legs of the machine converter.

CT Ratio Line [CT ratio line]

Linear number: 149 Minimum value: 10 Maximum value: 10000 Default value: 200 This parameter specifies the ratio of the current transformers used for line current feedback.

CT Ratio Motor [CT ratio motor]

Linear number: 150 Minimum value: 10 Maximum value: 10000 Default value: 2500 This parameter specifies the ratio of the current transducers (LEMs) used for motor current feedback.

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6-20 PARAMETER AND VARIABLE DESCRIPTIONS

AmpsRatedMotor

RatioTVxC ..768.1

RxR249

249

rPulseNumbe

AmpsRatedMotor

VxLEMRatio768.1

RxR249

249

CT Burden Line [CT burden line]

Linear number: 151 Minimum value: 1.0 ohms Maximum value: 1000.0 ohms (FRN 5.xx) 6300.0 ohms (FRN 4.xx) Default value: 15.0 ohms This parameter specifies the value of the scaling resistors for the line current feedback. To determine the required value for the scaling resistors, first calculate the equivalent scaling resistance using the following formula:

R =

Because of hardware differences between the original Drive Control board and the new 18-pulse Drive Control board, the actual value of resistor required depends on the firmware version:

For firmware revisions less than 5.00:

C.T. burden line =

For firmware revisions of 5.00 and above:

C.T. burden line = R x

Select the nearest standard resistor value.

CT Burden Motor [CT burden motor]

Linear number: 152 Minimum value: 1.0 ohms Maximum value: 1000.0 ohms (FRN 5.10) 6300.0 ohms (FRN 4.xx) Default value: 39.0 ohms This parameter specifies the value of the scaling resistors for the motor current feedback. To determine the required value for the scaling resistors, first calculate the equivalent scaling resistance using the following formula:

ohms

R =

Because of hardware differences between the original Drive Control board and the new 18-pulse Drive Control board, the actual value of resistor required depends on the firmware version:

For firmware revisions less than 5.00:

C.T. burden motor =

For firmware revisions of 5.00 and above: CT burden motor = R ohms

Select the nearest standard resistor value.

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ohms

PARAMETER AND VARIABLE DESCRIPTIONS 6-21

Pulse Number [Pulse number]

Linear number: 153 Minimum value: 6 Maximum value: 18 (FRN5.xx) 12 (FRN4.xx) Default value: 6 This parameter specifies the pulse number (6, 12, or 18) of the line converter. If this parameter is changed, the control power must be turned off and on before the new value takes eff ect.

Warning: Setting this parameter to the wrong value may cause multiple failures of line converter thyristors.

CT Configuration [CT configuration]

Linear number: 154 Minimum value: 2 Maximum value: 3 Default value: 2 This parameter specifies the number of current transformers per bridge for 12-pulse drives. Set this parameter

to 2 for drives with 2 CT’s on the master bridge only, and to 3 for drives with 3 CT’s on both the master and

slave bridges. If the wrong value is entered for this parameter, the line current feedback scaling will be wrong.

This parameter was added in Rev 4.72 and is not present in 5.xx

PWM Frequency Maximum [PWM freq maximum]

Linear number: 155 Minimum value: 200 Hz Maximum value: 280 Hz or 560 Hz (FRN 5.30) Default value: 200 Hz This parameter specifies the maximum GTO switching frequency. All PWM mode transition frequencies are proportional to this parameter. The 560 Hz maximum applies to Powerflex drives only. Bulletin 1557 drives rated less than 4000V and 2000 KW are automatically limited to 225 Hz maximum.

Flux Minimum [Flux minimum]

Linear number: 156 Minimum value: 0.20 pu Maximum value: 2.00 pu Default value: 0.40 pu This parameter specifies the minimum flux level for operation in the normal running mode. It is normally set to

0.40 pu.

CT Ratio Ground Fault [CT ratio gnd flt]

Linear number: 157 Minimum value: 10 Maximum value: 10000 Default value: 2000 This parameter specifies the ratio of the current transformer used to measure the ground fault (zero sequence) current at the input of the drive.

NOTE: When upgrading the firmware from a revision prior to 3.40, the bridge rectifier on the secondary of the ground fault CT should be removed, but the burden resistor and zener diodes should be retained unchanged.

CT Burden Ground Fault [CT burden gndflt]

Linear number: 158 Minimum value: 10 ohms Maximum value: 10000 ohms Default value: 1000 ohms This parameter specifies the value of the scaling resistor used for the ground fault current feedback.

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6-22 PARAMETER AND VARIABLE DESCRIPTIONS

Current Feedback Rated Line [I fbk rated line]

Linear number: 159 Minimum value: 0.500 V Maximum value: 2.500 V Default value: N/A This parameter specifies the rated line current feedback in volts rms calculated from the line CT ratio and burden and the rated motor current. It is not saved and is recalculated when any of the parameters affecting its value are changed. The nominal value is 1.768 V. A warning will be displayed if this parameter is out of range.

Current Feedback Rated Motor [I fbk rated motor]

Linear number: 160 Minimum value: 0.500 V Maximum value: 2.500 V Default value: N/A This parameter specifies the rated motor current feedback in volts rms calculated from the motor CT ratio and burden and the rated motor current. It is not saved and is recalculated when any of the parameters affecting its value are changed. The nominal value is 1.768 V. A warning will be displayed if this parameter is out of range.

11 Line Converter Protection Parameters

Line Overcurrent Trip [Line O/C trip]

Linear number: 161 Minimum value: 0.00 pu Maximum value: 2.00 pu Default value: 1.50 pu This parameter specifies the level the line current must exceed before a line overcurrent fault is indicated.

NOTE: For current ratings near the maximum for the drive frame size, this parameter will be automatically limited to a maximum value less than 2.00. This feature was added in Rev 4.62/5.11.

Line Overcurrent Delay [Line O/C delay]

Linear number: 162 Minimum value: 0.000 sec Maximum value: 0.040 sec Default value: 0.004 sec This parameter specifies the time the line current must remain above the trip level before a line overcurrent fault is indicated.

Line Overload Trip [Line O/L trip]

Linear number: 163 Minimum value: 0.20 pu Maximum value: 1.15 pu Default value: 1.00 pu This parameter specifies the maximum continuous operating current of the drive.

Line Overload Delay [Line O/L delay]

Linear number: 164 Minimum value: 0 sec Maximum value: 61 sec Default value: 60 sec This parameter specifies the time the drive may operate at 1.5 times the overload trip level before a line converter overload fault is indicated.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-23

Line Overvoltage Trip [Line O/V trip]

Linear number: 165 Minimum value: 0.00 pu Maximum value: 1.50 pu Default value: 1.20 pu This parameter specifies the level the line voltage must exceed before a line overvoltage fault is indicated.

Line Overvoltage Delay [Line O/V delay]

Linear number: 166 Minimum value: 0.000 sec Maximum value: 10.000 sec Default value: 0.050 sec This parameter specifies the time the line voltage must remain above the trip level before a line overvoltage fault is indicated.

Line Undervoltage Trip [Line U/V trip]

Linear number: 167 Minimum value: 0.70 pu Maximum value: 1.50 pu Default value: 0.85 pu This parameter specifies the level the line voltage must fall below before a line undervoltage condition is indicated.

Line Undervoltage Delay [Line U/V delay]

Linear number: 168 Minimum value: 0.010 sec Maximum value: 0.040 sec Default value: 0.020 sec This parameter specifies the time the line voltage must remain below the trip level before a line undervoltage condition is indicated.

DC Link Overcurrent Trip [DC O/C trip]

Linear number: 169 Minimum value: 0.10 pu Maximum value: 2.00 pu Default value: 2.00 pu This parameter specifies the level the dc link current must exceed before a dc link overcurrent fault is indicated.

NOTE: For current ratings near the maximum for the drive frame size, this parameter will be automatically limited to a maximum value less than 2.00. This feature was added in Rev 4.60/5.10.

DC Link Overcurrent Delay [DC O/C delay]

Linear number: 170 Minimum value: 0.000 sec Maximum value: 0.040 sec Default value: 0.004 sec This parameter specifies the time the dc link current must remain above the trip level before a dc link overcurrent fault is indicated.

NOTE: For Bulletin 1557M Drives, this parameter is internally limited to 0.004 sec maximum.

Ground Fault Overcurrent Trip [Gnd flt O/C trip]

Linear number: 171 Minimum value: 0.0 A Maximum value: 1.0 A Default value: 0.5 A This parameter specifies the level the ground fault current signal must exceed before a ground fault overcurrent is indicated.

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6-24 PARAMETER AND VARIABLE DESCRIPTIONS

Ground Fault Overcurrent Delay [Gnd flt O/C dly]

Linear number: 172 Minimum value: 0.000 sec Maximum value: 1.000 sec Default value: 0.050 sec This parameter specifies the time the ground fault current signal must remain above the trip level before a ground fault overcurrent is indicated.

Line dc link Over Voltage Trip [Line DC O/V trip]

Linear number: 173 Minimum value: 0.10 pu Maximum value: 1.47 pu Default value: 1.47 pu This parameter specifies the level the line side dc link voltage must exceed before a dc link over voltage fault is indicated.

This parameter was added in Rev 4.55/5.10.

Line dc link Over Voltage Delay [Line DC O/V dly]

Linear number: 174 Minimum value: 0.00 sec Maximum value: 0.040 sec Default value: 0.010 sec This parameter specifies the time the line side dc link voltage must remain above the trip level before a dc link over voltage fault is indicated.

This parameter was added in Rev 4.55/5.10.

Fan Loss Trip [Fan loss trip]

Linear number: 175 Minimum value: 0.0 V Maximum value: 9.9 V Default value: 2.0 V This parameter specifies the level that the output of the static pressure sensor in the converter cubicle must fall to before a fan loss warning is indicated. If the pressure falls below 80% of the trip level, a fan loss fault will be indicated and the drive will stop. This parameter is used for Powerflex drives only, because 1557 drives do not have a pressure sensor.

This parameter was added in Rev 5.30 and is not present in 4.xx.

Fan Loss Delay [Fan loss delay]

Linear number: 176 Minimum value: 0.0 sec Maximum value: 60.0 sec Default value: 5.0 sec This parameter specifies the time the static pressure in the converter cubicle must remain below the trip level before a fan loss warning or fault is indicated. The delay must be longer than the starting time of the cooling fan.

This parameter was added in Rev 5.30 and is not present in 4.xx.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-25

12 Motor Converter Protection Parameters

Motor Overcurrent Trip [Motor O/C trip]

Linear number: 177 Minimum value: 0.00 pu Maximum value: 2.00 pu Default value: 1.50 pu This parameter specifies the level the motor current must exceed before a motor overcurrent fault is indicated.

Motor Overcurrent Delay [Motor O/C delay]

Linear number: 178 Minimum value: 0.000 sec Maximum value: 0.100 sec Default value: 0.020 sec This parameter specifies the time the motor current must remain above the trip level before a motor overcurrent fault is indicated.

Motor Overload Trip [Motor O/L trip]

Linear number: 179 Minimum value: 0.20 pu Maximum value: 1.15 pu Default value: 1.00 pu This parameter specifies the maximum continuous operating current of the motor.

Motor Overload Delay [Motor O/L delay]

Linear number: 180 Minimum value: 0 sec Maximum value: 61 sec Default value: 60 sec This parameter specifies the time the motor may operate at 1.5 times the overload trip level before a motor converter overload fault is indicated.

Motor Overvoltage Trip [Motor O/V trip]

Linear number: 181 Minimum value: 0.00 pu Maximum value: 1.50 pu Default value: 1.20 pu This parameter specifies the level the motor voltage must exceed before a motor overvoltage fault is indicated.

Motor Over Voltage Delay [Motor O/V delay]

Linear number: 182 Minimum value: 0.000 sec Maximum value: 10.000 sec Default value: 0.050 sec This parameter specifies the time the motor voltage must remain above the trip level before a motor over voltage fault is indicated.

Motor Unbalance Trip [Motor U/B trip]

Linear number: 183 Minimum value: 0.00 pu Maximum value: 1.00 pu Default value: 0.10 pu This parameter specifies the level the motor current unbalance must exceed before a motor unbalance fault is indicated.

This parameter was added in Rev 5.30 and is not present in 4.xx.

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6-26 PARAMETER AND VARIABLE DESCRIPTIONS

Motor Unbalance Delay [Motor U/B delay]

Linear number: 184 Minimum value: 0.00 sec Maximum value: 10.00 sec Default value: 2.00 sec This parameter specifies the time the motor current unbalance must remain above the trip level before a motor unbalance fault is indicated.

This parameter was added in Rev 5.30 and is not present in 4.xx.

Motor Over Speed Trip [Over speed trip]

Linear number: 185 Minimum value: 10 Hz Maximum value: 100 Hz Default value: 66 Hz This parameter specifies the level the motor speed must exceed before a motor overspeed fault is indicated.

Motor Overspeed Delay [Overspeed delay]

Linear number: 186 Minimum value: 0.00 sec Maximum value: 10.00 sec Default value: 0.50 sec This parameter specifies the time the motor speed must exceed the trip level before a motor overspeed fault is indicated.

Motor DC Link Over Voltage Trip [Mtr DC O/V trip]

Linear number: 187 Minimum value: 0.10 pu Maximum value: 1.47 pu Default value: 1.47 pu This parameter specifies the level the machine side dc link voltage must exceed before a dc link over voltage fault is indicated.

DC Link Overvoltage Delay [DC O/V delay]

Linear number: 188 Minimum value: 0.000 sec Maximum value: 0.040 sec Default value: 0.004 sec This parameter specifies the time the machine side dc link voltage must remain above the trip level before a dc link overvoltage fault is indicated.

Note: For Bulletin 1557M drives this parameter is internally limited to 0.004 sec maximum.

Ground Fault Overvoltage Trip [Gnd flt O/V trip]

Linear number: 189 Minimum value: 0.00 pu Maximum value: 1.50 pu Default value: 0.20 pu This parameter specifies the level the motor neutral to ground voltage must exceed before a ground fault overvoltage is indicated.

Note: The value of this parameter must be increased for drives without isolation transformers because the neutral to ground voltage will be quite high in normal operation.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-27

Ground Fault Overvoltage Delay [Gnd flt O/V dly]

Linear number: 190 Minimum value: 0.000 sec Maximum value: 5.000 sec Default value: 0.500 sec This parameter specifies the time the motor neutral to ground voltage must remain above the trip level before a ground fault overvoltage is indicated.

Motor Stall Delay [Mtr stall delay]

Linear number: 191 Minimum value: 0.00 sec Maximum value: 10.0 sec Default value: 2.00 sec This parameter specifies the time the motor must be in a stall condition before a motor stall fault occurs. If the tachometer option is enabled, the motor is considered to be stalled if the drive is in torque limit at any speed less than 1 Hz. If the tachometer option is not enabled, the motor is considered to be stalled if the drive is at

commanded speed and the motor flux is below the level specified by parameter “Flux minimum”. A stall cannot

be detected until the drive reaches the commanded speed because the motor may already be rotating when the drive is started. In this case, if the motor speed is above the commanded speed, or the motor is rotating in the opposite direction, a stall fault will occur.

V Stator Minimum Thyristor Fault [Vs min thy fault]

Linear number: 192 Minimum value: 0.10 pu Maximum value: 0.50 pu Default value: 0.25 pu This parameter specifies the minimum stator voltage required for detection of machine converter thyristor faults. If the drive is incorrectly detecting motor thyristor faults while running (not while starting), increasing this parameter may eliminate the problem.

This parameter was added in Rev 5.10 and is not present in 4.xx.

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6-28 PARAMETER AND VARIABLE DESCRIPTIONS

13 Analog Output Parameters

Analog Offset 4L [Analog offset 4L]

Linear number 201 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00 V This parameter specifies the offset voltage for analog output 4L.

This parameter was added in Rev 5.00 and is not present in 4.xx.

Analog Offset 5L [Analog offset 5L]

Linear number: 193 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00 V This parameter specifies the offset voltage for analog output 5L.

Analog Offset 6L [Analog offset 6L] Linear number: 194 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00 V This parameter specifies the offset voltage for analog output 6L.

Analog Offset 4M [Analog offset 4M]

Linear number: 202 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00 V This parameter specifies the offset voltage for analog output 4M.

This parameter was added in Rev 5.00 and is not present in 4.xx.

Analog Offset 5M [Analog offset 5M] Linear number: 195 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00 V This parameter specifies the offset voltage for analog output 5M.

Analog Offset 6M [Analog offset 6M] Linear number: 196 Minimum value: -10.00 V Maximum value: 9.92 V Default value: 0.00V This parameter specifies the offset voltage for analog output 6M.

Analog Scale 4L [Analog scale 4L]

Linear number: 203 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 4L.

This parameter was added in Rev 5.00 and is not present in 4.xx.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-29

Voltsatreadingmeter

.10...

4096

Voltsatreadingmeter

.10...

128

Voltsatreadingmeter

RPM

.10...

4096

Voltsatreadingmeter

.10...

4096

Analog Scale 5L [Analog scale 5L]

Linear number: 197 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 5L. If this output is used to drive an analog voltmeter, the scale factor can be calculated using the following formula:

Analog Scale 5L =

Analog Scale 6L [Analog scale 6L]

Linear number: 198 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 6L. If this output is used to drive an analog ammeter, the scale factor can be calculated using the following formula:

Analog Scale 6L =

Analog Scale 4M [Analog scale 4M]

Linear number: 204 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 4M.

This parameter was added in Rev 5.00 and is not present in 4.xx.

Analog Scale 5M [Analog scale 5M] Linear number: 199 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 5M. If this output is used to drive an analog speed meter, the scale factor can be calculated using the following formula:

Analog Scale 5M =

Analog Scale 6M [Analog scale 6M] Linear number: 200 Minimum value: 0.000 Maximum value: 10.000 Default value: 1.000 This parameter specifies the multiplication scale factor for analog output 6M. If this output is used to drive an analog power meter, the scale factor can be calculated using the following formula:

Analog Scale 6M =

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6-30 PARAMETER AND VARIABLE DESCRIPTIONS

14 External Fault Parameters

A total of sixteen external fault inputs are provided. All sixteen can be sent from an external device via Remote I/O. Any of the first eight external faults can use discrete hardware inputs instead. The first three hardware fault inputs are standard and the remaining five require the optional discrete I/O. The class of each of the external faults is specified by a corresponding parameter. Class 1 faults cause the drive to trip immediately. Class 2 faults cause the drive to decelerate to a stop at the normal ramp rate before tripping. Class 3 faults are merely warnings and cause no action to be taken. External fault messages are displayed on the terminal in the same way as the permanent internal faults. The text of the external fault messages can be changed through the terminal.

External Fault 1-16 Class [Ext flt 1-16 class]

Linear numbers: 209-224 Minimum value: 1 Maximum value: 3 Default value: 2 These 16 parameters specify the class of each of the external faults.

These parameters were deleted in Rev 4.10 and reinstated in Rev 4.55/5.00.

15 Autotune Parameters

Autotune Select [Autotune Select]

Linear number: 12 Minimum value: 0 Maximum value: 8 Default value: 0 This parameter specifies the autotuning function to be performed: 0 Autotuning off 1 Commutation inductance 2 DC link time constant 3 Commutation inductance and DC link time constant (1 & 2) 4 Motor stator resistance 5 Motor leakage inductance 6 Flux regulator 7 Total inertia 8 Flux regulator and total inertia (6 & 7)

The value of this parameter is set to zero after completion of the selected function.

Autotune Idc Command [Autotune Idc cmd]

Linear number: 124 Minimum value: 0.100 pu Maximum value: 0.900 pu Default value: 0.500 pu This parameter specifies the dc current command used during autotuning of the dc link time constant. If the value of this parameter is set too low, the dc link current may become discontinuous and the autotuning may produce invalid results.

Autotune Idc Step [Autotune Idc stp]

Linear number: 125 Minimum value: 0.000 pu Maximum value: 0.500 pu Default value: 0.250 pu This parameter specifies the value of the step that is added to the dc current command during autotuning of the dc link time constant. If the value of this parameter is set too high relative to the dc current command, the dc link current may become discontinuous and the autotuning may produce invalid results.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-31

Autotune Idc Bandwidth [Autotune Idc BW]

Linear number: 126 Minimum value: 10 r/s Maximum value: 100 r/s Default value: 50 r/s This parameter specifies the bandwidth of the current regulator during autotuning of the dc link time constant. A lower bandwidth is used during autotuning than during normal operation because a slower response can be

measured more accurately.

Autotune Speed Command [Autotune spd cmd]

Linear number: 94 Minimum value: 20.0 Hz Maximum value: 50.0 Hz Default value: 30.0 Hz This parameter specifies the speed command used during autotuning of the flux regulator and total inertia.

Prior to Rev 4.72/5.20, this parameter was called Autotune Speed Command Minimum and was defined differently.

Autotune Torque Step [Autotune trq stp]

Linear number: 96 Minimum value: 0.050 Maximum value: 0.500 Default value: 0.100 This parameter specifies the size of the torque step that is added to the torque command during autotuning of the total inertia. A value of 1.000 corresponds to rated torque.

Prior to Rev 4.60/5.00, this parameter was scaled in per unit based on the motor rated kVA and was about 10% lower.

Autotune Isd Step [Autotune Isd step]

Linear number: 107 Minimum value: 0.001 pu Maximum value: 0.020 pu Default value: 0.010 pu This parameter specifies the size of the step that is added to the magnetizing current command during autotuning of the flux regulator for synchronous machines. It is not used for induction motors.

This parameter was added in Rev 5.00 and is not present in 4.xx.

Autotune Commutation Inductance [Autotune Lc]

Linear number: 127 Minimum value: 0.00 pu Maximum value: 0.50 pu Default value: 0.00 pu This parameter specifies the value of commutation inductance determined during autotuning. If the commutation inductance autotuning is successful, then parameter "L commutation" in "P Current Control" is set equal to the value of this parameter. If the commutation inductance autotuning fails, then parameter "L commutation" is not changed.

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6-32 PARAMETER AND VARIABLE DESCRIPTIONS

Autotune dc Link Time Constant [Autotune Tdc]

Linear number: 128 Minimum value: 0.000 sec Maximum value: 0.160 sec Default value: 0.000 sec This parameter specifies the value of dc link time constant determined during autotuning. If the dc link time constant measurement is successful, then parameter "T dc link" in "P Current Control" is set equal to the value of this parameter. If the dc link time constant measurement fails, then parameter "T dc link" is not changed.

Autotune Stator Resistance [Autotune Rs]

Linear number: 140 Minimum value: 0.00 pu Maximum value: 0.20 pu Default value: 0.00 pu This parameter specifies the value of motor stator resistance determined during autotuning. If the stator resistance autotuning is successful, then parameter “ R Stator “ in “ P Motor model” is set equal to the value of this

parameter. If the stator resistance autotuning fails, then parameter “ R stator” is not changed.

Autotune Leakage Inductance [Autotune Ls]

Linear number: 141 Minimum value: 0.00 pu Maximum value: 0.74 pu Default value: 0.00 pu This parameter specifies the value of motor leakage inductance determined during autotuning. If the leakage inductance autotuning is successful, then parameter "L total leakage" in "P Motor Model" is set equal to the value of this parameter. If the leakage inductance autotuning fails, then parameter "L total leakage" is not changed.

Autotune Magnetizing Inductance [Autotune Lm]

Linear number: 142 Minimum value: 0.00 pu Maximum value: 15.00 pu Default value: 0.00 pu This parameter specifies the value of motor magnetizing inductance determined during flux regulator autotuning. If the magnetizing inductance measurement is successful, then parameter "L magnetizing" in "P Motor Model" is set equal to the value of this parameter. If the magnetizing inductance measurement fails, then parameter "L magnetizing" is not changed.

Autotune Rotor Time Constant [Autotune T rotor]

Linear number: 143 Minimum value: 0.00 sec Maximum value: 10.00 sec Default value: 0.00 sec This parameter specifies the value of rotor time constant determined during flux regulator autotuning. If the rotor time constant measurement is successful, then parameter "T rotor" in "P Motor Model" is set equal to the value of this parameter. If the rotor time constant measurement fails, then parameter "T rotor" is not changed.

Autotune Lmd [Autotune Lmd]

Linear number: 139 Minimum value: 0.00 pu Maximum value: 10.00 pu Default value: 0.00 pu This parameter specifies the value of d-axis magnetizing inductance for synchronous machines determined during flux regulator autotuning. If the magnetizing inductance measurement is successful, then parameter "Lmd" in "P Motor Model" is set equal to the value of this parameter. If the magnetizing inductance measurement fails, then parameter "Lmd " is not changed. This parameter is not used for induction motors

This parameter was added in Rev 5.10 and is not present in 4.xx.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-33

Autotune Inertia [Autotune inertia]

Linear number: 144 Minimum value: 0.00 sec Maximum value: 100.00 sec Default value: 0.00 sec This parameter specifies the value of total system inertia measured during autotuning. If the inertia measurement is successful, then parameter "Total inertia" in "P Speed Control" is set equal to the value of this parameter. If the inertia measurement fails, then parameter "Total inertia" is not changed.

16 Option Parameters

Synchronizing Regulator Gain [Sync reg gain]

Linear number: 225 Minimum value: 0.0 Maximum value: 7.9 Default value: 1.0 This parameter specifies the gain of the synchronizing regulator.

Synchronous Transfer Lead Angle [Sync lead angle]

Linear number: 226 Minimum value: -90 degrees Maximum value: 90 degrees Default value: 0 degrees This parameter specifies the angle by which the motor voltage leads the drive input voltage when the motor is assumed to be synchronized. The purpose of this parameter is to compensate for any phase difference between the drive input voltage and the bypass contactor supply voltage.

Synchronous Transfer Off Delay [Sync off delay]

Linear number: 227 Minimum value: 0.000 seconds Maximum value: 0.500 seconds Default value: 0.100 seconds This parameter specifies the time delay between the bypass contactor being requested to close and the drive shutting off. It is normally set to slightly less than the contactor closing time.

Synchronizing Error Maximum [Sync error max]

Linear number: 228 Minimum value: 0 degrees Maximum value: 30 degrees Default value: 0 degrees This parameter specifies the maximum allowable synchronizing phase error. The bypass contactor will be requested to close when the synchronizing phase error has remained below this maximum value for the time specified by the Synchronizing Time parameter.

Synchronizing Time [Sync time]

Linear number: 229 Minimum value: 0.1 seconds Maximum value: 10.0 seconds Default value: 1.0 seconds This parameter specifies the time that the synchronizing phase error must be less than Synchronizing Error Maximum before the bypass contactor is requested to close.

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6-34 PARAMETER AND VARIABLE DESCRIPTIONS

Synchronous Transfer Time [Sync xfer time]

Linear number: 230 Minimum value: 0.1 min. Maximum value: 57.0 min. Default value: 1.0 min. This parameter specifies the time allowed for completion of a synchronous transfer. If transfer is not complete

within this time, the drive will stop with a “sync transfer failed” fault. If the “sync transfer failed” fault is disabled,

the transfer request will be cancelled and the drive will continue to run at the commanded speed. A “sync transfer failed” warning will be displayed.

This parameter was added in Rev 4.60/5.10.

External Fault Input [Ext fault input]

Linear number: 232 Minimum value: 0000 Hex Maximum value: FFFF Hex Default value: 0000 Hex This parameter specifies the external fault inputs. It is bit encoded as shown below:

xxx1H - External Fault 1 xxx2H - External Fault 2 xxx4H - External Fault 3 xxx8H - External Fault 4 xx1xH - External Fault 5 xx2xH - External Fault 6 xx4xH - External Fault 7 xx8xH - External Fault 8 x1xxH - External Fault 9 x2xxH - External Fault 10 x4xxH - External Fault 11 x8xxH - External Fault 12 1xxxH - External Fault 13 2xxxH - External Fault 14 4xxxH - External Fault 15 8xxxH - External Fault 16

The presence of an external fault is indicated by setting the corresponding bit. The absence of an external fault is indicated by clearing the corresponding bit.

This parameter is normally sent from an external device via RI/O. The first eight external faults are OR’ed with

the eight hardware fault inputs (i.e. the maximum number of external faults is 16, not 24). If any of the first eight external faults are sent from an external device via RI/O, the corresponding hardware fault input must not be connected.

Tachometer Type [Tach type]

Linear number: 233 Minimum value: 1 Maximum value: 2 or 3 (FRN5.20 only) Default value: 2 This parameter specifies the type of tachometer or encoder installed. 1 single output (non-directional) 2 quadrature outputs (directional) 3 absolute encoder (for synchronous machines)

Warning: If tachometer type is set to 1, the drive cannot determine the direction of rotation when the motor is coasting. If the direction of rotation is not the same as the commanded direction, a flying start will not be successful.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-35

Tachometer Pulses Per Revolution [Tach pulse/rev]

Linear number: 234 Minimum value: 120 Maximum value: 4096 Default value: 360 This parameter specifies the number of pulses produced by the tachometer in one revolution. This parameter is not used for absolute encoders.

Tachometer Loss Trip [Tach loss trip]

Linear number: 235 Minimum value: 0.0 Hz Maximum value: 10.0 Hz Default value: 2.0 Hz This parameter specifies the amount by which the speed feedback from the tachometer and the speed feedback derived from stator frequency must differ before a tachometer loss fault is indicated.

Tachometer Loss Delay [Tach loss delay]

Linear number: 236 Minimum value: 0.00 sec Maximum value: 1.00 sec Default value: 0.10 sec This parameter specifies the time that the tachometer error must be greater than the trip level before a tachometer loss fault is indicated.

Tachometer Select [Tach select]

Linear number: 237 Minimum value: 0 Maximum value: 3 Default value: 0 This parameter specifies which of the four tachometer inputs available on the Tachometer Feedback Board is to be used by the drive. It is not used for synchronous motors with absolute encoders.

Encoder Offset [Encoder offset]

Linear number: 238 Minimum value: 0 deg Maximum value: 359 deg Default value: 0 deg This parameter specifies the value of the offset between the rotor d-axis of the synchronous machine and the zero of the absolute position encoder. It can be set manually or by autotuning. This parameter is not used for induction motors with incremental encoders.

Warning: Parameter “Speed Feedback Select” should not be set to 1 until the encoder offset has been correctly set.

This parameter was added in Rev 5.20 and is not present in 4.xx.

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6-36 PARAMETER AND VARIABLE DESCRIPTIONS

Encoder Reverse [Encoder reverse]

Linear number: 239 Minimum value: 0 Maximum value: 1 Default value: 0 This parameter specifies the direction of rotation of an absolute position encoder. If the parameter is set to 1, the drive firmware reverses the output of the encoder. The encoder rotation should be reversed if a “Tach rotation” warning occurs and cannot be cleared when the drive is running (the warning can always be cleared when the drive is stopped). This parameter is not used for induction motors with incremental encoders.

Warning: Parameter “Speed Feedback Select” should not be set to 1 until the encoder direction has been correctly set.

This parameter was added in Rev 5.20 and is not present in 4.xx.

17 Control Mask Parameters

The parameters in this group specify which adapters are allowed to control the various drive functions. All the parameters in this group are bit encoded as shown below:

xxx1H - adapter 0 xxx2H - adapter 1 xxx4H - adapter 2 xxx8H - adapter 3 xx1xH - adapter 4 xx2xH - adapter 5 xx4xH - adapter 6 xx8xH - adapter 7

Setting a bit enables the function for the corresponding adapter. Clearing a bit disables the function for the corresponding adapter. There is no mask for the stop function because it is enabled for all connected adapters at all times. The control mask parameters are not saved and are set to their default value at power up.

Logic Mask [Logic mask]

Linear number: 241 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue commands to the drive.

Local Mask [Local mask]

Linear number: 242 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can take exclusive local control of the drive.

Start Mask [Start mask]

Linear number: 243 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue start commands.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-37

Direction Mask [Direction mask]

Linear number: 244 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue forward/reverse commands.

Jog Mask [Jog mask]

Linear number: 245 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue jog commands.

Fault Reset Mask [Reset mask]

Linear number: 247 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue fault reset commands.

Speed Command Mask [speed cmd mask]

Linear number: 248 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can select the drive speed command.

Synchronous Transfer Mask [Sync xfer mask]

Linear number: 249 Minimum value: 00 Hex Maximum value: FF Hex Default value: FF Hex This parameter specifies which adapters can issue synchronous transfer commands.

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6-38 PARAMETER AND VARIABLE DESCRIPTIONS

Variable Descriptions

The drive variables are described in this section. The variable descriptions are arranged in the functional groups used by the programming terminal. Each description begins with the full name of the variable, followed by the name displayed on the programming terminal. The linear number of the variable is given followed by the minimum and maximum values showing the position of the decimal point and the units if applicable. Next is the scaling which applies when the variable is assigned to an analog output. Finally, there is a short description of the function of the variable.

18 Status Variables

Logic Command [Logic command]

Linear number: 257 Minimum value: 0000 Hex Maximum Value: FFFF Hex Analog Output Scaling: N/A This variable is the value of the logic command word. It is bit encoded as shown below:

xxx1H - not stop xxx2H - start xxx4H - reverse xxx8H - jog

xx1xH - increase speed command xx2xH - decrease speed command xx4xH - reset faults & warnings xx8xH - clear fault & warning queue

x1xxH - transfer to drive x2xxH - transfer to bypass x4xxH - not defined x8xxH - not defined

0xxxH - select external speed command 0 (analog input 1L) 1xxxH - select preset speed command 1 2xxxH - select preset speed command 2 3xxxH - select preset speed command 3 4xxxH - select preset speed command 3 5xxxH - select preset speed command 3 6xxxH - select preset speed command 3 7xxxH - select preset speed command 3 8xxxH - select external speed command 8 (analog input 1M) 9xxxH - select port 1 speed command AxxxH - select port 2 speed command BxxxH - select port 3 speed command CxxxH - select port 4 speed command DxxxH - select port 5 speed command ExxxH - select port 6 speed command FxxxH - select preset jog speed command

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PARAMETER AND VARIABLE DESCRIPTIONS 6-39

Logic Status 1 [Logic status 1]

Linear number: 258 Minimum value: 0000 Hex Maximum Value: FFFF Hex Analog Output Scaling: NA This variable is the value of logic status 1, the status word that has the same definition for all drives. It is bit encoded as shown below:

xxx1H - enabled xxx2H - running xxx4H - forward command xxx8H - forward rotation

xx1xH - accelerating xx2xH - decelerating xx4xH - warning xx8xH - fault

x1xxH - at speed command x0xxH - port 0 local x2xxH - port 1 local x4xxH - port 2 local x6xxH - port 3 local x8xxH - port 4 local xAxxH - port 5 local xCxxH - port 6 local xExxH - no local

0xxxH - external speed command 0 selected (analog input 1L) 1xxxH - preset speed command 1 selected 2xxxH - preset speed command 2 selected 3xxxH - preset speed command 3 selected 4xxxH - preset speed command 3 selected 5xxxH - preset speed command 3 selected 6xxxH - preset speed command 3 selected 7xxxH - preset speed command 3 selected 8xxxH - external speed command 8 selected (analog input 1M) 9xxxH - port 1 speed command selected AxxxH - port 2 speed command selected BxxxH - port 3 speed command selected CxxxH - port 4 speed command selected DxxxH - port 5 speed command selected ExxxH - port 6 speed command selected FxxxH - preset jog speed command selected

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6-40 PARAMETER AND VARIABLE DESCRIPTIONS

Local Discrete Inputs [Local inputs]

Linear number: 260 Minimum value: 0000 Hex Maximum Value: FFFF Hex Analog Output Scaling: N/A This variable is the value of the 16 local discrete digital inputs. It is bit encoded as shown below:

xxx1H - not stop xxx2H - start xxx4H - input contactor closed xxx8H - output contactor closed xx1xH - select speed command 8 xx2xH - not external fault 1 xx4xH - not external fault 2 xx8xH - not external fault 3

x1xxH - not external fault 4 x2xxH - not external fault 5 x4xxH - not external fault 6 x8xxH - not external fault 7 1xxxH - not external fault 8 2xxxH - transfer to drive 4xxxH - transfer to bypass 8xxxH - bypass contactor closed

The second 8 inputs are optional and will not be present on all drives.

Local Discrete Outputs [Local outputs]

Linear number: 261 Minimum value: 0000 Hex Maximum Value: FFFF Hex Analog Output Scaling: N/A This variable is the value of the 16 local discrete digital outputs. It is bit encoded as shown below:

xxx1H - ready xxx2H - running xxx4H - reverse rotation xxx8H - fault xx1xH - warning xx2xH - start fans xx4xH - close input contactor xx8xH - close output contactor

x1xxH - close bypass contactor x2xxH - at speed command x4xxH – in torque limit x8xxH – in test mode 1xxxH – synchronous transfer in progress 2xxxH – start field supply 4xxxH – enable field supply 8xxxH - reset faults

The second 8 outputs are optional and will not be present on all drives.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-41

Pass Code [Pass code]

Linear number: 262 Minimum value: 0 Maximum value: 65535 Analog Output Scaling: N/A This variable is the encoded value of the terminal pass number. If the terminal pass number is lost or corrupted, the value of the pass number can be determined from the encoded value by consulting the factory.

19 Speed Command Variables

Speed Command 0 [Speed command 0]

Linear number: 273 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the value of analog speed command 0 from analog input 1L.

Speed Command 8 [Speed command 8]

Linear number: 274 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the value of analog speed command 8 from analog input 1M.

Speed Command 9 [Speed command 9]

Linear number: 275 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the value of the digital speed command from the selected SCANport adapter. Since the inputs from all SCANport adapters are multiplexed through this one variable, only the input from the selected adapter is visible.

Speed Command Input [Speed command in]

Linear number: 276 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the value of the selected speed command input. It is valid whether the drive is running or not.

Speed Command [Speed command]

Linear number: 277 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the drive speed command, which is the input to the speed ramp. It is set to zero when the drive is not running.

Speed Reference [Speed reference]

Linear number: 278 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the drive speed reference, which is the output of the speed ramp.

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6-42 PARAMETER AND VARIABLE DESCRIPTIONS

20 Speed Control Variables

Speed Feedback [Speed feedback]

Linear number: 289 Minimum value: -100.0 Hz Maximum value: 100.0 Hz Analog Output Scaling: 1.0 V = 12.8 Hz This variable is the calculated speed feedback after filtering. The speed feedback is positive for forward rotation and negative for reverse rotation.

Speed Error [Speed error]

Linear number: 290 Minimum value: -10.00 Hz Maximum value: 10.00 Hz Analog Output Scaling: 1 V = 0.2 Hz This variable is the speed error obtained by subtracting the speed feedback from the speed reference. It is useful for checking the step response of the speed loop.

Torque Reference [Torque reference]

Linear number: 291 Minimum value: -1.500 pu Maximum value: 1.500 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the torque reference, which is the output of the speed regulator after the torque rate limit and the motoring and generating torque limits have been applied. A value of 1.00 corresponds to rated torque. It is positive for forward torque and negative for reverse torque.

Prior to Rev 4.60/5.00, this variable was scaled in per unit based on the motor rated kVA and was about 10% lower.

Isq Command [Isq command]

Linear number: 292 Minimum value: -2.000 pu Maximum value: 2.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the Q-axis stator current command obtained by dividing the torque reference by the flux reference. It is positive for motoring and negative for generating.

Icq Command [Icq command]

Linear number: 293 Minimum value: -1.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the Q-axis capacitor current command. It is an estimate of the Q-axis current provided by the motor filter capacitor.

Iy Command [Iy command]

Linear number: 294 Minimum value: -2.000 pu Maximum value: 2.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the torque current command obtained by subtracting Icq Command from Isq Command.

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PARAMETER AND VARIABLE DESCRIPTIONS 6-43

PWM Pulse number [PWM pulse number]

Linear number: 295 Minimum value: 1 Maximum value: 361 Analog Output Scaling: NA This variable indicates the number of pulses per cycle for the active PWM mode.

Synchronizing Regulator Error [Sync reg error]

Linear number: 297 Minimum value: -180 degrees Maximum value: +180 degrees Analog Output Scaling: 1.0 V = 18 degrees This variable is the synchronizing regulator error, which is the phase angle between the line voltage and the motor voltage during a synchronous transfer from drive to bypass.

Synchronizing Regulator Output [Sync reg output]

Linear number: 298 Minimum value: -10.0 Hz Maximum value: +10.0 Hz Analog Output Scaling: 1.0 V = 0.2 Hz This variable is the synchronizing regulator output, which is added to the speed regulator error during a synchronous transfer from drive to bypass.

21 Flux Control Variables

Flux Reference [Flux reference]

Linear number: 305 Minimum value: 0.000 pu Maximum value: 1.500 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the rotor flux reference, which varies between a minimum value set by parameter Flux Command No Load and a maximum value set by parameter Flux Command Base Speed. The flux reference varies directly with torque at all speeds, and decreases with speed above Base Speed. The flux reference is also automatically reduced if the current regulator approaches advance limit or retard limit, which can occur when running at high speed and high torque with low line voltage.

Flux Feedback [Flux feedback]

Linear number: 306 Minimum value: 0.000 pu Maximum value: 1.500 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the selected flux feedback, either Flux from Voltage, Flux from Current, or a combination of both.

Flux Error [Flux error]

Linear number: 307 Minimum value: -1.500 pu Maximum value: 1.500 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the flux error obtained by subtracting the flux feedback from the flux reference.

Isd Command 0 [Isd command 0]

Linear number: 308 Minimum value: 0.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the feedforward component of the D-axis stator current command. It is an estimate of the steady state D-axis current and is always positive.

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6-44 PARAMETER AND VARIABLE DESCRIPTIONS

Isd Command 1 [Isd command 1]

Linear number: 309 Minimum value: -1.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the closed loop correction component of the D-axis stator current command. It is the output of the flux regulator and may be positive or negative.

Isd Command [Isd command]

Linear number: 310 Minimum value: -1.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the D-axis stator current command, which is the sum of Isd Command 0 and Isd Command 1.

Icd Command [Icd command]

Linear number: 311 Minimum value: 0.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the D-axis capacitor current command. It is an estimate of the D-axis current provided by the motor filter capacitor.

Ix Command [Ix command]

Linear number: 312 Minimum value: -1.000 pu Maximum value: 1.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the magnetizing current command obtained by subtracting Icd Command from Isd Command. It is positive for lagging current and negative for leading current.

I Field Command [I field command]

Linear number: 314 Minimum value: 0.000 pu Maximum value: 1.000 pu Analog Output Scaling: 10.0 V = 1.000 pu This variable is the current command for the synchronous motor field supply. For synchronous drives, this variable must be assigned to one of the external analog outputs (normally output 4L). An analog output of 10.0 V corresponds to maximum field current, which should be somewhat higher than rated field current. The scaling of the field current command can be adjusted to match the scaling of the field supply current reference input using parameter Analog Scale 4L in Analog Output Parameters. For induction motors this variable is always equal to zero.

This variable was added in Rev 5.00 and is not present in 4.xx.

22 Current Control Variables

Idc Reference [Idc reference]

Linear number: 321 Minimum value: 0.000 pu Maximum value: 2.000 pu Analog Output Scaling: 5.0 V = 1.0 pu This variable is the dc link current reference.

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Rockwell Automation 1557 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual