Siemens SAMMS-MV User Manual

SAMMS-MV

™

Siemens Advanced Motor Master System for
Medium Voltage Motors

User's Manual

14

13

12

11

10

9

8

7

4

3

2

1

6

5

15

16

Manual No. MVC-9108

The information contained herein is general in nature and not intended for specific
application purposes. It does not relieve the user of responsibility to use sound
practices in application, installation, operation, and maintenance of the equip­ment purchased. Siemens reserves the right to make changes in the specifica­tions shown herein or to make improvements at any time without notice or
obligations. Should a conflict arise between the general information contained in
this publication and the contents of drawings or supplementary material or both,
the latter shall take precedence.

For the purpose of this manual a qualified person is one who is familiar with the
installation, construction or operation of the equipment and the hazards involved.
In addition, he has the following qualifications:
(a) is trained and authorized to de-energize, clear, ground, and tag circuits

and equipment in accordance with established safety practices.

(b) is trained in the proper care and use of protective equipment such as

rubber gloves, hard hat, safety glasses or face shields, flash clothing, etc.,
in accordance with established safety practices.

(c) is trained in rendering first aid.

IMPORTANT

QUALIFIED PERSON

These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency
to be met in connection with installation, operation, or maintenance. Should further information be desired or should
particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to
the local sales office.

The contents of this instruction manual shall not become part of or modify any prior or existing agreement, commitment
or relationship. The sales contract contains the entire obligation of Siemens Energy & Automation, Inc. The warranty
contained in the contract between the parties is the sole warranty of Siemens Energy & Automation, Inc. Any statements
contained herein do not create new warranties or modify the existing warranty.

SUMMARY

Contents

1 Introduction .............................................2

1.1 About this Manual ............................................3

1.2 About the SAMMS-MV Device ..........................3

1.2.1 The SAMMS-MV Device Models ............4

1.2.2 Advanced Protection for Medium-Voltage

Motors ...................................................4

1.2.3 Overload Protection ...............................5

1.2.4 Programming Control Circuits ................5

1.2.5 Using the Standardized Control Panel....5

2 Installing the SAMMS-MV Device..........7

2.1 Receiving and Storing the SAMMS-MV Device. 7

2.2 Where to Locate the Device .............................7

2.3 Mounting the Device .........................................7

2.4 Connecting the Device .....................................7

2.4.1 Wiring Guidelines ...................................7

2.4.2 Grounding the Device ............................9

2.4.3 Connecting the Device to a Control Power

Source...................................................9

2.4.4 Connecting Input and Output Devices to

the SAMMS-MV Device .........................9

2.4.5 Communications Connection ................. 9

3 Operating the SAMMS-MV Device ......11

3.1 Password Protection.......................................11

3.2 Using the Reset/Test Push Button ..................11

3.2.1 Performing a Lamp Test .......................11

3.2.2 Performing an Overload Relay Test...... 11

3.3 Motor Control .................................................11

3.4 Output Devices ............................................... 12

3.5 Input Devices ..................................................12

3.6 Ladder Diagrams............................................13

3.6.1 Library of Standard Ladder Diagrams...13

3.6.2 Custom Ladder Diagrams ....................13

3.7 Incomplete Sequence ..................................... 17

3.8 Intelligent Reduced-Voltage

Starting (SAMMS-MVX Only)...........................17

3.9 Ridethrough Upon Loss of Power

(SAMMS-MVX Only) ........................................ 17

3.10 Overload Protection........................................ 17

3.11 Motor Ambient Temperature ...........................17

3.12 Protection Curves and Overload

Classes ..........................................................19

3.13 Ultimate Trip Level and Service Factor ............23

3.14 Phase Unbalance ........................................... 23

3.15 Dual Overload Protection................................ 23

3.16 Jam Protection (SAMMS-MVX Only) ...............23

3.17 Loss of Load Protection/Warning

(SAMMS-MVX Only) ........................................ 23

3.18 Process Current Warning (SAMMS-MVX Only) 23

3.19 Stator Protection.............................................23

3.20 Rotor Protection .............................................23

3.21 Repetitive Starts .............................................24

3.22 Start Inhibit .....................................................24

3.23 Cooling T ime Constants .................................24

3.24 Normalized Temperature Rise for Class B and

Class F Insulation ...........................................24

3.25 Ground Fault Detection .................................. 24

3.26 Autoreset After a Trip (SAMMS-MVX Only) ......26

3.27 Emergency Restarting .................................... 26

3.28 Using the Hand Held Communicator (HHC) ...26

3.28.1 The (F)unction Key ...............................26

3.28.2The LIST Key ....................................... 26

3.28.3 UP and DOWN Keys ............................28

3.28.4 Using the ENTER Key ..........................28

3.29 Using the SAMMS-MV Device

Functions ....................................................... 28

3.29.1Program Mode/Passwords...................32

3.29.2 SAMMS-MV Functions ........................32

4 Troubleshooting the SAMMS-MV

Device.....................................................40

Appendix A - Technical Specifications of the

SAMMS-MV Device...............................43

©Copyright 1994 Siemens Energy & Automation, Inc.
ACCESS, SAMMS, SAMMS-MV, Series 81000, SEAbus, Power Monitor, Power Monitor PC, WinPM, and SIEServe are trademarks
of Siemens Energy & Automation, Inc. Microsoft is a registered trademark and Windows is a trademark of Microsoft Corporation.
IBM is a registered trademark of International Business Machines, Inc.

1

1 Introduction

1 Introduction

The SAMMS-MV electronic motor control and protection de-

vice is designed and manufactured in accordance with the

latest applicable provisions of the National Electric Code,

Underwriters Laboratories Standards and Procedures, NEMA

Standards, and the National Electric Safety Code. You must

thoroughly read and understand this users manual before you

begin any work with the SAMMS-MV device. Successful appli-

cation and operation of this equipment depends as much upon

proper installation and maintenance by the user as it does upon

the careful design and fabrication by Siemens.

The purpose of this instruction manual is to assist the user in

developing safe and efficient procedures for the installation,

maintenance, and use of the equipment.

Contact the nearest Siemens representative if any additional

information is desired.

Qualified Person

For the purpose of this manual and product labels, a Qualified

Person is one who is familiar with the installation, construction

and operation of this equipment, and the hazards involved. In

addition, this person has the following qualifications;

Signal Words

The signal words Danger, Warning, and Caution used

in this manual indicate the degree of hazard that may be

encountered by the user. These words are defined as:

DangerIndicates an imminently hazardous situation which,

if not avoided, will result in death or serious injury.

WarningIndicates an potentially hazardous situation which,

if not avoided, could result in death or serious injury.

CautionIndicates an potentially hazardous situation which,

if not avoided, may result in minor or moderate injury.

Dangerous Procedures

In addition to other procedures described in this manual as

dangerous, user personnel must adhere to the following:

1. Always work on de-energized equipment. Always de-ener-

gize a breaker, or contactor, and remove it from the equip-

ment before performing any tests, maintenance, or repair.

2. Always perform maintenance on equipment employing springs

after the spring-charged mechanisims are discharged.

3. Always let an interlock device or safety mechanism perform

its function without forcing or defeating the device.

Field Service Operation

Siemens can provide compentent, well-trained Field Service

Representatives to provide technical guidance and advisory

assistance for the installation, overhaul, repair, and mainte-

nance of Siemens equipment, processes, and systems. Con-

tact regional service centers, sales offices, or the factory for

details.

 Training and authorization to energize, de-energize, clear,

ground, and tag circuits and equipment in accordance with

established safety practices.

 Training in the proper care and use of protective equipment

such as rubber gloves, hard hat, safety glasses, face shields,

flash clothing, etc., in accordance with established safety

procedures.

 Training in rendering first aid.

2

1 Introduction

1.1 About this Manual

This manual introduces you to the Siemens Advanced Motor

Master System (SAMMS-MV) motor protection and control

relay which incorporates protection designed for medium

voltage machines. This manual also contains information for

installing and operating the device, communicating with other

devices over the ACCESS electrical distribution communica-

tions system, and troubleshooting the device. This manual also

provides a helpful technical reference for you to use. Refer to

table 1.1 to determine which section of the manual contains the

information that you need.

These instructions prepare you to handle, install, operate and

maintain the SAMMS-MV device and the Hand-Held Commu-

nicator (HHC). The individual starters and controllers used are

designed for specific applications based upon your equipment

and needs. Instructions covering these starters and compo-

nents are not included in this manual. For this information, refer

to instructions and drawings furnished with your equipment, or

contact your Siemens representative. You must read these

instructions and determine applicability of your equipment.

Refer to the nameplate data on your controller and to the

electrical diagrams supplied with your controller to determine

applicability of your equipment.

1.2 About the SAMMS-MV Device

The SAMMS-MV device, shown in Figure 1.1, is a software-

configured electronic motor control and overload protection

device that incorporates protection tailored to the special

characteristics of medium voltage motors. The SAMMS-MV

system includes a microprocessor-based SAMMS-MV device

which receives signal inputs from a set of current transformers

(either 3-1Ø or 1-3Ø) and power input from a 12 volt tap on the

controllers control power transformer. To perform certain

monitoring and setup activities, a Hand-Held Communicator

(HHC) shown in Figure 1.2, is required. The SAMMS-MV device

is a multi-functional device offering the following:

 advanced motor protection for medium voltage motors

 pre-programmed control circuits

 standardized control panel with input/output devices replac-

ing conventional push-buttons, pilot lights and selector

switches

 diagnostics

 statistical motor data

 real-time metering

 local display of all motor and control circuit data

 open architecture communications using the ACCESS sys-

tem

Note: The SAMMS-MV device does not replace the disconnect

device (drawout contactor mounting or isolating switch) or the

contactor itself.

If you need to... ...refer to this section

learn about the SAMMS-MV device Section 1, Introduction

install the SAMMS-MV device Section 2, Installing the SAMMS-MV Device

operate the SAMMS-MV device Section 3, Operating the SAMMS-MV Device

operate the Hand-Held Communicator Section 3, Operating the SAMMS-MV Device

connect the SAMMS-MV device to the ACCESS

Section 2, Installing the SAMMS-MV Device

System

troubleshoot the SAMMS-MV device Section 4, Troubleshooting the SAMMS-MV Device

learn about the technical specifications of the

Appendix A, Technical Specifications of the SAMMS-MV Device

SAMMS-MV device

Table 1.1 Where to find information

3

1 Introduction

16

15

14

13

12

11

10

9

8

7

6

4

5

3

2

1

Figure 1.1 SAMMS-MV, front view

1.2.1 The SAMMS-MV Device Models

The SAMMS-MV device is available in two models: SAMMS-MVE

and SAMMS-MVX. Each model meets the various demands of

industrial and commercial specifications and installations. Table

1.2 compares the features of each model.

The SAMMS-MV device is designed for critical process control

where prevention of downtime is critical. It offers motor control

and protection along with motor diagnostic and motor/driven

equipment protection. Engineering and operating personnel

have access to important data enabling them to optimize

motor-driven equipment capabilities, maximize the process

system output and facilitate maintenance.

SAMMS-MVX is a full function model, applicable to all control

needs, from a simple across-the-line unit to a more compli-

cated reduced voltage scheme. It includes all of the functions

listed in table 3.7. Any of the standard control circuits listed in

table 3.3, or a custom circuit, may be downloaded. The

SAMMS-MVX device accepts up to four remote inputs, while

SAMMS-MVE accepts two remote inputs.

SAMMS-MVE is a model of SAMMS-MV tailored to across-the-

line (FVNR) applications. It provides all of the protective func-

tions of the SAMMS-MVX device, except that it has no jam

protection (F23), loss of load protection/alarm (F24), or process

current warning (F22) functions. Functions F3 and F5 associ-

ated with two-speed applications are not available. No provi-

sion for automatic reset (F8) is provided. SAMMS-MVE accepts

one remote input, and provides one output to actuate a single

contactor. An alarm contact is not available with SAMMS-MVE.

These remote inputs are compatible with all PLCs and electro-

mechanical remote control devices that have a 120VAC or

125VDC input signal.

1.2.2 Advanced Protection for

Medium-Voltage Motors

For advanced protection of medium voltage motors, the

SAMMS-MV device uses a motor model algorithm that continu-

ally calculates the stator winding and housing temperature as

well as the rotor temperature as a function of the motor rms

current. The motor model compares the calculated tempera-

ture to trip temperature values and provides a signal that trips

the motor off line when the motor reaches a trip temperature

value. The model closely emulates the heating and cooling of

the motor windings as well as the rotor and provides protection

against both transient and steady-state overload conditions.

4

1 Introduction

across-the-line starters to complicated reduced-voltage start-

ers. With optional software, the specified control circuit can be

loaded either from the library or from a modified version into the

microprocessors memory, in the factory or on site, using an

IBM®-PC compatible computer. If you would like to learn more

about this software package, refer to SAMMS Custom Soft-

ware Manual, Bulletin CP 3291.

Highly specialized control circuits can be developed and exist-

ing circuits can be modified using an optional IBM-PC compat-

ible software package. This software uses conventional engi-

neering symbols along with pull-down menus and a mouse to

draw ladder diagrams. When you have finished drawing the

diagram, the software translates the diagram into microproces-

sor machine code and downloads it into the SAMMS-MV

devices memory.

1.2.5 Using the Standardized Control Panel

The SAMMS-MV device can be used for local and/or remote

control. The SAMMS-MVE device provides two light bars, while

the SAMMS-MVX model provides three light bars. Each model

includes six pushbuttons with lights and tactile feedback. You

can program these light bars and pushbuttons for the various

functions of the control circuit used.

Figure 1.2 Hand-Held Communicator (HHC)

1.2.3 Overload Protection

The motor model offers the selection of overload classes 2

through 23.

The SAMMS-MV device offers more accurate motor protection

than traditional thermal overload and most electronic motor

protection devices. This prolongs motor life by eliminating

nuisance tripping for multiple restarts, and allowing for proper

cool down time when the motor winding temperature or rotor

temperature reaches a critically high value.

1.2.4 Programming Control Circuits

The SAMMS-MV device allows you to modify its configuration

by programming the microprocessor. The SAMMS-MV device

replaces conventional timers, overload relays, pushbuttons,

and selector switches.

SAMMS-MVE is preloaded with seven across-the-line control

circuits, and the desired control circuit can be selected using

the Hand-Held Communicator (HHC.) Alternatively, a custom

across-the-line circuit may be downloaded from a PC.

The test/reset button is used to test and reset the overload

function and to test the front panel lights.

Diagnostics

Eight diagnostic LEDs, located on the front panel, provide

information about conditions affecting the motor.

Statistical Data about the Motor

The microprocessors memory stores statistical data about the

motor and displays this data on the Hand-Held Communicator

(HHC).

Real-Time Metering Data

The Hand-Held Communicator displays real-time metering

data.

Local Displaying of Motor and Circuit Data

The HHC and the eight (8) diagnostic LEDs display motor and

control circuit data. The eight (8) diagnostic LEDs are located on

the front panel of the device.

Communicating with Other Devices

The SAMMS-MV device communicates with other devices via

the ACCESS system. When connected to the ACCESS system,

the SAMMS-MV device provides two-way communication with

the Power Monitor display and monitoring unit, an IBM PC-

compatible computer running the Power Monitor PC com-

munications and supervisory software or another supervisory

device. This ability allows you to control and monitor motors

from a centralized location. You can have remote access to all

SAMMS-MV data such as diagnostics, statistical data, real-

time metering, and controller status. If you would like to learn

more about the ACCESS system, refer to Installing the AC-

CESS System (manual no. SG6028).

A library of more than 40 typical control circuits exists for use

with SAMMS-MVX to meet applications ranging from simple

5

1 Introduction

SAMMS-MV Model SAMMS-MVE SAMMS-MVX

Application

Across-the-line (FVNR)

Reversing

Two-speed

Reduced voltage

Functions available (see table 3.7)

Ridethrough upon loss of power

Ground fault protection/alarm

Programmable alarm contact

Control circuits

Change settings requires password

Remote inputs

Outputs

Light bars

Table 1.2 SAMMS-MV models

X X

F0-F21 plus F25-F27 (except no

F3, F5, or F8)

No Yes

Yes Yes

No Yes

Seven (preloaded), selectable with

HHC. May download any custom

across-the-line control circuit

Yes Yes

One Four

One Three

Two Three

X

X

X

F0-F27

Any downloadable control circuit

6

2 Installing the SAMMS-MV Device

2 Installing the SAMMS-MV Device

This section provides instructions for installing the SAMMS-MV
device. You should adapt these instructions to suit the needs of
your installation and equipment.

2.1 Receiving and Storing the
SAMMS-MV Device

Thoroughly inspect the equipment before accepting the ship­ment from the transportation company. Compare each item
received against the packing list and report any shortages or
damaged equipment to the carrier.

If you are not going to install the SAMMS-MV device immedi­ately, store it in a clean, dry location at ambient temperatures
from -40° C to 85° C. The surrounding air should not contain any
corrosive fumes or electrically conductive contaminants. The
storage location should prevent condensation from forming
within the equipment enclosure.

Note: Improper storage can cause equipment damage. Follow
all storage instructions carefully. Failure to follow storage in­structions will void the warranty.

2.2 Where to Locate the Device

You can locate the SAMMS-MV device and its associated
devices in most industrial equipment environments. Unless the
device is designed for specific requirements, you should install
the SAMMS-MV device and its controller in an area where the
following conditions exist:

• Ambient air must be free of dirt, combustible vapor, steam,
electrically conductive or corrosive material.

• Area around the controller must provide access to the
equipment for inspection, maintenance and operation.

2.3 Mounting the Device

The SAMMS-MV device mounts in a front door panel of the low
voltage compartment of Siemens Series 81000™ medium
voltage control (MVC) equipment. Mount the device in the
normal low-voltage compartment associated with each me­dium voltage controller.

2.4 Connecting the Device

This section contains general guidelines that you should follow
to connect the SAMMS-MV device. These guidelines include
instructions for routing the wire, connecting the wire and
grounding the device. Use these guidelines to install the
SAMMS-MV device and its peripheral devices in a motor
controller. Also use these guidelines to connect the motor
controller to the motor.

When Siemens supplies a SAMMS-MV device as part of a
motor controller, Siemens personnel install the wiring between
the SAMMS-MV device and its peripheral devices in the motor

controller at the factory. The schematic diagram used contains
three components: a connection diagram, a ladder diagram
and a wiring diagram. The connection diagram illustrates the
connections between the SAMMS-MV device and its periph­eral devices. The ladder diagram illustrates the control circuit
loaded into the SAMMS-MV device. Figure 2-1 shows a typical
connection diagram for the SAMMS-MV device.

If Siemens does not supply the motor controller, the retrofitter
or original equipment manufacturer should develop an equiva­lent electrical scheme.

2.4.1 Wiring Guidelines

You must observe the following guidelines when installing the
SAMMS-MV device and connecting it with its peripheral de­vices.

Note: Failure to follow these guidelines can cause pickup of
unwanted signals resulting in erratic operation and damage to
the SAMMS-MV device.

Guideline 1: Separate the low-voltage (115 VAC or less) from
the higher voltage conductors (460 VAC or higher) as much as
possible. If low-voltage and medium-voltage wires must cross
paths, make sure that they intersect at a right angle.

Guideline 2: To eliminate noise coupling, install all twisted pairs
or wrap wires in such a way that a complete twist or wrap occurs
at least every two inches.

Guideline 3: Place the low-voltage leads near the controller
chassis.

Guideline 4: Use at least AWG 14 stranded copper wire for any
low-voltage control wiring that you route outside the motor
controller enclosure. Connections to the SAMMS-MV unit must
be made with wire no larger than AWG 14.

Guideline 5: To avoid ground loops, ground each motor
controller at a single ground point.

The top portion of the device contains 16 terminal locations for
connecting control power leads, power supply, ground, inputs
and outputs. (Refer to Figure 2.2 for a description of each
terminal block assignment.)

7

2 Installing the SAMMS-MV Device

Figure 2.1 Full voltage non-reversing connection diagram

8

2 Installing the SAMMS-MV Device

2.4.2 Grounding the Device

As stated in Guideline 5, ground each motor controller at a
single ground point. The grounding path to earth must be
permanent and continuous. It must also be able to safely
conduct ground fault currents that may occur in the system to
ground through minimum impedance. The earth ground does
not carry any current under normal conditions.

Note: Do not ground the SAMMS auxiliary current sensor (ACT)
leads. (See figure 2.1.)

ALARM RELAY OUTPUT

115VAC (CPT INPUT)

12VAC (CPT INPUT)
12VAC (CPT INPUT)

Connect a ground bus to the chassis of each controller or to the
chassis of the mounting equipment containing the earth ground
through a grounding conductor.

Refer to Article 250 of the National Electrical Code for informa­tion about the types and sizes of wire conductors and methods
for safely grounding electrical equipment and components.

2.4.3 Connecting the Device to a Control
Power Source

The SAMMS-MV device requires a 12 VAC control power
source in order to operate. Connect the control power source
to terminals 5 and 6 located on the top of the relay.

2.4.4 Connecting Input and Output Devices
to the SAMMS-MV Device

Connect your devices to the input and output connections on
the SAMMS-MV device as illustrated in Figure 2.2.

2.4.5 Communications Connection

The SAMMS-MV device is equipped with an RS-485 commu­nications port on the back of the device. The communications
port allows connection to a communications module which

AC INPUT 4
AC INPUT 3
AC INPUT 2
AC INPUT 1

ACT RETURN

ACT INPUT 1
ACT INPUT 2
ACT INPUT 3

12345678 9 10 11 121314

SAMMS-MVX

LED on LED Flashing

LED

Current

> 40%

Unbalance
Impending

> 110%

Trip
Overload

Overload

Trip
Incomplete

Trip

Sequence

Trip: Loss

External

of Load, or

TripAlarm

Jam, or
RTDInput
Trip: CPU

CPU

Failure or

Fault

Low Voltage

Ground

Trip

Fault

20 - 40%
> 100%

< 110%
Start

Inhibit

Alarm: Loss
of Load or
Prcs Current

Alarm

CPU
Fault

Ground
Fault

Ready

Current
Unbalance

Impending
Trip

Overload
Trip

Incomplete
Sequence

External
Trip/Alarm

Reset/Test

15 16

RETURN
OUTPUT 3
OUTPUT 2
OUTPUT 1

Figure 2.2 Terminal block assignments

9

2 Installing the SAMMS-MV Device

enables the SAMMS-MV to communicate with a remote super­visory device. Examples of the remote supervisory device
include the Power Monitor display and monitoring unit, a
standard personal computer running the Power Monitor PC
communications and supervisory software, or Siemens
Microsoft® Windows™ based SIEServe™ or WinPM™ soft­ware. These supervisory devices and programs can communi­cate with the SAMMS-MV device and allow it to operate in the

1 = ­2 = GND
3 = +
4 = 12VDC+
5 = 12VDC-

Top View

ACCESS electrical distribution communications system.
The SAMMS-MV device connects to the SEAbus™ RS-485 via

the 5 pin plug on the Communications Module CM-1. The
communications connections are illustrated in Figure 2.3. Refer
to Installing the ACCESS System (manual no. SG-6028), for
detailed information on connecting the SAMMS-MV device to
the ACCESS network.

Proper make-up of 5 pin plug

Rear View

54321

Side View

5 pin plug

12345

4

3

1 2

Ribbon cable assembly

12Vdc(-)
12Vdc(+)

BLK

Comm Cable Comm Cable

SAMMS
Communications
Module
CM-1

WHT

Shield

Figure 2.3 SAMMS-MV device communications connections

10

Rear view of the SAMMS-MV device

3 Operating the SAMMS-MV Device

3 Operating the SAMMS-MV Device

This section explains how to operate the SAMMS-MV device.

3.1 Password Protection

Changing the settings of the SAMMS-MV device requires the

use of the Hand-Held Communicator (HHC) in the program

mode. To access the program mode, the user needs a

password. The SAMMS-MV device is shipped from the factory

with the password 0000. This password can be changed by

the user as described in section 3.29.1. Display of data using

the HHC does not require use of a password.

3.2 Using the Reset/Test Push Button

The Reset/Test pushbutton is located at the bottom center of

the front panel of the SAMMS-MV device as illustrated in Figure

3.1. You press this pushbutton to manually reset the SAMMS-MV

device after a fault or a trip condition occurs so that the motor

can be restarted. You can also use the Reset/Test pushbutton

to perform a lamp test or an overload relay test.

3.2.1 Performing a Lamp Test

To test the diagnostic LEDs, the control LEDs and the light bars

on the front panel, use the following procedure:

1. Press and hold the Reset/Test pushbutton for one to two

seconds.

3.2.2 Performing an Overload Relay Test

You may perform an overload relay test whenever the motor is

stopped. Use the following procedure to perform an overload

relay test.

1. Press and hold the Reset/Test pushbutton for at least the

duration of the class time. The class time is set by accessing

function F7. If you need to know how to access function F7,

see Section 3.29. If you release the Reset/Test pushbutton

before the duration of the class time, the device performs a

lamp test. If a fault or trip condition exists when you press the

Reset/Test pushbutton, the device performs a reset instead

of a lamp test.

2. Continue to hold down the Reset/Test pushbutton. After

reaching the class time duration, the Impending Trip and the

Phase Unbalance LEDs illuminate.

3. Release the Reset/Test pushbutton. The Impending Trip

and Phase Unbalance LEDs go off, and the Overload Trip

LED illuminates for two seconds. If the SAMMS-MV device

is tripped, it is automatically reset at the end of the overload

relay test.

Use the following procedure to reset the SAMMS-MV device

after a trip event.

1. Press the Reset/Test pushbutton.

2. Release the Reset/Test pushbutton. (All LEDs and light bars

on the front panel illuminate for two seconds.)

If a fault or trip condition exists when you press the Reset/Test

pushbutton, the device performs a reset instead of a lamp test.

Figure 3.1 Front view of SAMMS-MV

2. Release the Reset/Test pushbutton. The device resets the

alarm LEDs. If the motor has cooled sufficiently, you can

restart the motor.

3.3 Motor Control

You can configure the SAMMS-MV device to perform many

motor starting and control functions. These functions include

basic across-the-line, to more complicated reversing, two-

speed, and reduced-voltage starting. The SAMMS-MV device

stores in its memory the executable code representing the

ladder diagram for the users control application. The

SAMMS-MV device and ladder diagram code replace the

conventional control logic defined by wired interconnection of

electromechanical timers, control relays, pushbuttons, selector

switches, and pilot lights. A library of over 40 standard ladder

diagrams available for the SAMMS-MV device covers most

applications. In addition to the standard ladders, you can

construct custom ladder diagrams, using optional software, to

handle special applications.

Figures 3.2 and 3.3 illustrate the ladder symbols representing

input and output devices available for the SAMMS-MV device.

The circular symbols represent output devices such as contactor

coil drivers, pilot LEDs on the front panel of the SAMMS-MV

device, software time-delay relays and software control relays.

All other symbols represent input devices such as software

auxiliary contacts, remote AC inputs, front-panel pushbuttons,

and software timer instantaneous and timed contacts.

11

3 Operating the SAMMS-MV Device

STATE

LED On Flashing

Current

Unbalance

> 40% 20 - 40%

Impending Trip > 110% > 100% - <110%

Overload Trip Trip Start Inhibit

Incomplete

Sequence

Trip

External

Trip/Alarm

Trip: Loss of Load

or Jam or RTD

Alarm: Loss of

Load or Process

Current

CPU Fault Trip: CPU Failure or

Low Voltage

Ground Fault Trip Alarm

Light bar (L1) Stop or Off Off Delay Timer

Timing

Light bar (L2) Start, On, Forward,

Low Speed, Right

On Delay Timer

Timing

Light bar (L3) Reverse, High

Speed, Left

On Delay Timer

Timing

3.4 Output Devices

You can use the following SAMMS-MV output devices:

AC Outputs

The SAMMS-MVX device provides up to three AC coil drivers

capable of driving contactors up to size H6, while SAMMS-MVE

provides one coil driver.

Control Relays

The device provides up to eight software-controlled relays.

These relays are helpful in local two-wire and other applications

requiring maintained contacts.

Timing Relays

The SAMMS-MV device contains four internal software timing

relays. You can configure all four timers as on-delay timers;

however, if needed, you can configure the two adjustable timers

(timing relays TR1 and TR2) as either on-delay or off-delay

timers. Using the Hand Held Communicator, you can program

timing relays TR1 and TR2 from 0 through 200 seconds

(functions F13 and F14). Timing relay TR3 has a fixed 1 second

delay, and timing relay TR4 has a fixed 30 seconds delay. Table

3.1 illustrates the type of timers used on the device and their

ranges.

Timer Type Time (in seconds)

TR1 Programmable on-delay or

off-delay

TR2 Programmable on-delay or

off-delay

TR3 Fixed on-delay 1

0 - 200

0 - 200

Front Panel Pushbuttons

The SAMMS-MV device has six front-panel pushbuttons for

local control of the device. You must use pushbutton 1 (PB1) for

stopping the motor. You must use three of the pushbuttons

(PB4-PB6) for the Hand, Off and Auto functions if these

functions are used in your configuration. If these functions are

not used, you may use PB4-PB6 for other functions. You can

configure the other two pushbuttons (PB2 and PB3) at your

discretion. Refer to Figure 3.4 for assignment of pushbuttons.

Insert labels are used to identify the function associated with

each pushbutton or light bar.

Software Auxiliary Contacts

Any number of internal (software) auxiliary contacts can be

configured. These contacts show either a normally open (NO)

or normally closed (NC) status. You can set up these auxiliary

contacts using the SAMMS-MV software. Through the

SAMMS-MV software, the pilot LEDs also have auxiliary con-

tacts.

TR4 Fixed on-delay 30

Table 3.1 Types of software tming relays

Pilot LEDs

The SAMMS-MVX device contains three light bars on the front

panel, while the SAMMS-MVE contains two light bars. Light bar

L1 is reserved and must be used as the STOP or OFF LED. You

can configure L2 and L3 at your discretion. The Hand, Off and

Auto LEDs correspond to the Hand, Off and Auto pushbuttons

on the front panel as illustrated in Figure 3.4. You can use the

Incomplete Sequence LED in reduced-voltage applications or

to verify contactor operation. Refer to Figure 3.4 for the location

of the LEDs and Table 3.2 for a description of the LED states.

Flashing Pilot LEDs

The front panel contains two or three flashing light bars that

indicate various conditions such as on-delay timing. These

flashing light bars, L1, L2 and L3 as defined above, indicate

different output devices if they are flashing rather than if they are

on constantly. Refer to Figure 3.4 for an illustration of pilot LEDs.

3.5 Input Devices

You can use the following input devices with the SAMMS-MV

device.

Remote AC Inputs

For SAMMS-MVX you can use four 120 VAC or VDC inputs for

remote control, or you can use one input for SAMMS-MVE.

12

Table 3.2 Description of pilot LEDs

Software Timer Inputs

Each timer has an unlimited number of normally open (NO) and

normally closed (NC) contacts. Timers configured as on-delay

timers have an unlimited supply of normally open timed-closed

(NOTC), and normally closed timed-open (NCTO) contacts.

Timers configured as off-delay timers have an unlimited supply

of normally open timed-open (NOTO), and normally closed

timed-closed (NCTC) contacts.

Communications Inputs

A serial, RS-485 communications port is located on the back of

the device for external communications.

3 Operating the SAMMS-MV Device

The communications inputs must be included in the ladder logic

(control circuit).

3.6 Ladder Diagrams

3.6.1 Library of Standard Ladder Diagrams

The SAMMS-MV library of more than 40 ladder diagrams

covers most standard motor control applications. Table 3.3 lists

the standard control circuits and the input and output assign-

ments for the library. You can use the library with the following

starter types:

• across-the-line, non-reversing

• across-the-line, reversing

• two-speed, two winding

• two-speed, one-winding, constant or variable torque

• two-speed, one-winding, constant horsepower

• reduced-voltage, autotransformer

• reduced-voltage, reactor

For each starter type, the library includes seven control types:

• local two-wire

• local three-wire

• local three-wire, remote two-wire

• local two-wire, remote two-wire

• local three-wire, remote three-wire

• remote two-wire

• remote three-wire

SAMMS-MVE has seven preloaded circuits (ladder diagrams)

for use with across-the-line (FVNR) applications. SAMMS-MVX

may be used with any of the circuits.

For details on the library of standard ladder diagrams, refer to

the SAMMS Standard Circuit Manual.

3.6.2 Custom Ladder Diagrams

For special motor control applications not covered by the library

of standard ladders, you can construct custom ladder dia-

grams using the input and output devices and their associated

symbols for the SAMMS-MV device. Siemens personnel can

build these custom ladder diagrams or you can build your own.

You can purchase an optional IBM PC-compatible software

package to develop custom ladder diagrams for special control

applications. The package also includes a library of standard

symbols. The package enables you to reconfigure existing

SAMMS-MV devices to meet changing plant needs. Refer to

the Custom Software Manual for the SAMMS device, Bulletin

CP 3291.

Figure 3.2 Ladder symbols used with the SAMMS-MV device (sheet 1)

13

3 Operating the SAMMS-MV Device

Figure 3.3 Ladder symbols used with the SAMMS-MV device (sheet 2)

12345678 9 10 11 12

STOP or OFF

SAMMS-MVX

LED on LED Flashing

LED

VARIABLE

Current
Unbalance

Impending
Trip

Overload
Trip

Incomplete
Sequence

External
TripAlarm

CPU
Fault

Ground
Fault

> 40%

> 110%

Overload

VARIABLE

Trip
Trip: Loss

of Load,or
Jamor
RTDinput

Trip: CPU
Failure or
Low Voltage

Trip

20 - 40%
> 100%

< 110%
Start

Inhibit

Alarm: Loss
of Load or
Prcs Current

Alarm

L1

L2

L3

CPU
Fault

Ground
Fault

Ready

Current
Unbalance

Impending
Trip

Overload
Trip

Incomplete
Sequence

External
Trip/Alarm

Reset/Test

13

15 16

14

PB6

AUTO or
VARIABLE

PB5

OFF or
VARIABLE

PB4

HAND or
VARIABLE

PB3

PB2

PB1

VARIABLE

VARIABLE

STOP or OFF

Figure 3.4 Assignment of pushbuttons and light bars

14

Preloaded in

SAMMS-MVE

can be

downloaded

in

SAMMS-MVX

3 Operating the SAMMS-MV Device

Input Assignments

Starter

Type

FVNR PB10 LOCAL, 2-WIRE OFF ON

FVNR PB11 LOCAL, 3-WIRE STOP START

FVNR PB12 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP START HAND OFF AUTO

FVNR PB13 LOCAL/REMOTE 2-WIRE STOP HAND OFF AUTO

FVNR PB14 LOCAL/REMOTE 3-WIRE STOP START

FVNR PB15 REMOTE, 2-WIRE

FVNR PB16 REMOTE, 3-WIRE

Program

Block

Control Type PB1 PB2 PB3 PB4 PB5 PB6

Available with

SAMMS-MVX

only

FVR PB17 LOCAL, 2-WIRE OFF FWD REV

FVR PB18 LOCAL, 3-WIRE STOP FWD REV

FVR PB19 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP FWD REV HAND OFF AUTO

FVR PB20 LOCAL/REMOTE 2-WIRE STOP FWD REV HAND OFF AUTO

FVR PB21 LOCAL/REMOTE 3-WIRE STOP FWD REV

FVR PB22 REMOTE, 2-WIRE

FVR PB23 REMOTE, 3-WIRE

FVR PB24 LOCAL/REMOTE 3-WIRE

2SPD,2W PB25 LOCAL, 2-WIRE OFF LOW HIGH

2SPD,2W PB26 LOCAL, 3-WIRE STOP LOW HIGH

2SPD,2W PB27 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

2SPD,2W PB28 LOCAL/REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

2SPD,2W PB29 LOCAL/REMOTE 3-WIRE STOP LOW HIGH

2SPD,2W PB30 REMOTE, 2-WIRE

2SPD,2W PB31 REMOTE, 3-WIRE

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

2SPD,

1W, CT

OR VT

PB32 LOCAL, 2-WIRE OFF LOW HIGH

PB33 LOCAL, 3-WIRE STOP LOW HIGH

PB34 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

PB35 LOCAL/REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

PB36 LOCAL/REMOTE 3-WIRE STOP LOW HIGH

PB37 REMOTE, 2-WIRE

PB38 REMOTE, 3-WIRE

Table 3.3 Standard control circuits

ELECTRICALLY INTERLOCKED

STOP FWD REV

15

3 Operating the SAMMS-MV Device

Available with

SAMMS-MVX

only

Starter

Type

2SPD,

1W, CH

2SPD,

1W, CH

2SPD,

1W, CH

2SPD,

1W, CH

2SPD,

1W, CH

2SPD,

1W, CH

2SPD,

1W, CH

Program

Block

PB39 LOCAL, 2-WIRE OFF LOW HIGH

PB40 LOCAL, 3-WIRE STOP LOW HIGH

PB41 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

PB42 LOCAL/REMOTE 2-WIRE STOP LOW HIGH HAND OFF AUTO

PB43 LOCAL/REMOTE 3-WIRE STOP LOW HIGH

PB44 REMOTE, 2-WIRE

PB45 REMOTE, 3-WIRE

Control Type PB1 PB2 PB3 PB4 PB5 PB6

Input Assignments

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Auto TX)

RVA

(Reactor)

RVA

(Reactor)

RVA

(Reactor)

RVA

(Reactor)

RVA

(Reactor)

RVA

(Reactor)

RVA

(Reactor)

PB46 LOCAL, 2-WIRE OFF ON

PB47 LOCAL, 3-WIRE STOP START

PB48 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP START HAND OFF AUTO

PB49 LOCAL/REMOTE 2-WIRE STOP HAND OFF AUTO

PB50 LOCAL/REMOTE 3-WIRE STOP START

PB51 REMOTE, 2-WIRE

PB52 REMOTE, 3-WIRE

PB301 LOCAL, 2-WIRE OFF ON

PB302 LOCAL, 3-WIRE STOP START

PB303 LOCAL, 3-WIRE, REMOTE 2-WIRE STOP START HAND OFF AUTO

PB304 LOCAL/REMOTE 2-WIRE STOP HAND OFF AUTO

PB305 LOCAL/REMOTE 3-WIRE STOP START

PB306 REMOTE, 2-WIRE

PB307 REMOTE, 3-WIRE

Table 3.3 Standard control circuits (continued)

16

3 Operating the SAMMS-MV Device

3.7 Incomplete Sequence

Sometimes the motor contactors do not respond in a timely

manner to start, stop, transition, speed or direction change

commands from the controller. If the SAMMS-MV device does

not detect motor current one second after issuing a start

command or if the SAMMS-MV device detects motor current

one second after issuing a stop command, an Incomplete

Sequence trip occurs. The motor contactors are opened and

the Incomplete Sequence LED illuminates solidly. In standard

reduced-voltage autotransformer (RVA) starters, an incomplete

sequence also occurs if the remote RUN seal-in contact wired

to pin 9 does not close within one second of the transition from

starting to full-speed operation. This function can be disabled

permanently when configured at the factory. You can also

disable it with the Hand Held Communicator to the SAMMS-MV

device. This is helpful when the controller is tested before

connecting to the motor. After connecting the HHC, use the

function UP and DOWN buttons to select F1. While pressing the

ENTER button for a period of one second push START.

Repeating the same process enables the incomplete sequence

protection function.

3.8 Intelligent Reduced-Voltage Starting

(SAMMS-MVX Only)

Intelligent reduced-voltage starting is provided in all standard

reduced-voltage Siemens starters. The advantage of this fea-

ture is that the transition from reduced to full voltage is deter-

mined by the magnitude of the actual motor current and not by

a timer. This optimizes the transition.

When a motor with intelligent reduced-voltage starting is started,

a 30 second timer is energized. If the timer times out, the

transition to full voltage commences as a fail-safe measure. If,

before the 30 second timer times out, the motor current drops

to below the full-load current setting, the transition commences.

The state of the RUN contactor, whose auxiliary contact is

connected to Remote input 4 (pin 9), is checked one second

after the transition. If the contactor is not closed, an incomplete

sequence trip occurs.

3.9 Ridethrough Upon Loss of Power

(SAMMS-MVX Only)

If a motor is running and control power is lost, the motor restarts

automatically with two-wire control as soon as power is re-

stored. With three-wire control, you must restart the motor

manually. The optional ridethrough feature available with

SAMMS-MVX allows three-wire controls to ride through power

outages of up to one second. This feature is especially useful

where the power system is subject to momentary interruptions.

If, while the motor is running, power is lost to a three-wire control

having the ridethrough option, the contactors are opened to

prevent chattering and then reclosed automatically if power

returns within one second.

3.10 Overload Protection

Medium-voltage motors are rotor limited under locked rotor

conditions, and stator limited under running overload condi-

tions. Additionally, the type of motor construction affects the

thermal behavior of the rotor. For example, open drip-proof

motors have significantly shorter cold stall times than totally

enclosed fan-cooled motors. The motor protection algorithm in

the SAMMS-MV device is designed specifically to provide rotor

protection based on the type of motor construction, and to

differentiate between a stalled rotor and a rotor accelerating to

running speed.

The motor overload protection function is based on calculating

the motors winding, housing, and rotor temperatures. These

temperatures are compared to the allowable temperature limits

for the motors winding, housing, and rotor. On the basis of this

comparison, the SAMMS-MV device either stops the motor or

allows it to run.

For example, consider the motor winding and rotor temperature

rises illustrated in Figure 3.5. The motor starts for 5 seconds and

runs for a period of 2200 seconds. Then, the motor is subjected

to a running overload condition that raises the winding tempera-

ture to the maximum allowable winding temperature rise result-

ing in an overload trip. At this temperature, the motor cannot

start until the motor winding temperature cools down to the full-

load temperature. The motor can then start and run at full-load

current. Figure 3.6 depicts the temperature rise in the rotor and

stator winding during a 10 second stall for an ODP motor. In this

case, the rotor temperature rises at a rate faster than the

winding temperature, and reaches the maximum allowable

value resulting in a trip. In order to prevent damage to the motor,

SAMMS-MV will not allow the motor to start until the winding

and the rotor temperatures cool down to the full load tempera-

ture or less.

In the motor model, the greatest of the root mean square (RMS)

current values for the motor phases is converted into a heat-like

quantity. This is done by a mathematical function that depends

on the ratio of the RMS current to the full-load current set for the

motor. The function is based not only on ideal overload

characteristics, but also on empirical motor data. The heat-like

quantity is analogous to an input source of current to the

electric-circuit analog. The exact values of the various elements

in the circuit depend, in some cases, on nameplate data

entered for the particular motor being protected. Unlike the

method of protection in conventional overload relays, the motor

model is general enough to protect many classes of motors, yet

sophisticated enough to offer customized protection to particu-

lar motors. To customize protection to the motor enter the

following nameplate data:

• full-load current setting (F4)

• service factor (F6)

• type of motor construction (Open Drip Proof (ODP) or Totally

Enclosed Fan Cooled (EFC) (F6)

• cold stall time, if available (F7)

• motor ambient temperature (F0)

3.11 Motor Ambient Temperature

Motors are used in a wide range of temperatures. However,

motors designed according to NEMA standards are rated at

40°C ambient temperature.

The SAMMS-MV allows you to decrease or increase the

motors thermal capacity according to the motors ambient

17

3 Operating the SAMMS-MV Device

Figure 3.5 ODP motor thermal signature

18

3 Operating the SAMMS-MV Device

Figure 3.6 Rotor and winding temperature during 10 second motor stall

temperature. You can select ambient temperature from 0° to

70°C in increments of 5°C, with HHC function F0.

Important: Do not use this feature with motors rated for ambient

temperature other than the standard 40°C.

are designed to cause a trip in 90% to 100% of the class time

for a current of 600% of I

The lowest overload class, greater than or equal to the motors

starting time, gives the best protection. Overload classes 2

through 23 are available in SAMMS-MV. The range of protec-

3.12 Protection Curves and Overload

Classes

The specific motor protection curve selected depends upon the

overload class setting. The overload class is defined as the

maximum tripping time in seconds for a current level of 600%

of the full-load current or I

motors is 600% of I

of 10 guarantees that a current of 600% of I

FLC

in 10 seconds or less. In the SAMMS-MV, the protection curves

. (The typical starting current of

FLC

.) For example, an overload class setting

will cause a trip

FLC

tion curves are shown in Figures 3.7 through 3.10.

Important: In the unlikely event that the motor acceleration time

(overload class) exceeds the motors stall time, use a speed

switch as an input source to open the contactor if the switch

senses a locked rotor or stall condition.

Note: For clarity, the time-current characteristic curves in this

manual are shown with overload classes 2, 5, 10, 15 and 23

only. Use interpolation to derive values of other overload

classes not shown.

FLC

.

19

3 Operating the SAMMS-MV Device

ratio

I

FLC

I

10000

1000

100

10

SECONDS

1

110

.1

ratio

I

FLC

I

20

10000

1000

100

10

SECONDS

1

110

.1

Figure 3.7 Time-current characteristic curve for cold motors with SF=1.00 Figure 3.8 Time-current characteristic curve for warm motors with SF=1.00

3 Operating the SAMMS-MV Device

ratio

I

FLC

I

10000

1000

100

10

SECONDS

1

110

.1

Figure 3.10 Time-current characteristic curve for warm motors with SF=1.15Figure 3.9 Time-current characteristic curve for cold motors with SF=1.15

ratio

I

FLC

I

10000

1000

100

10

SECONDS

1

110

.1

21

3 Operating the SAMMS-MV Device

100000

Motor running current
at full load current

10000

Loss of load
adjustable from
20 to 90% of
rated FLC

1000

Jam protection
adjustable from
120 to 400% of FLC

Seconds

100

10

1

.1

Jam and loss of load
protection persistence
delay (5 times overload class)

.1 1

Class 5 curve

Motor starting current
600% rated full load current

I

ratio

I

FLC

Cold stall time
adjustable from
5 to 100 seconds

610

Figure 3.11 Motor protection graph

22

3 Operating the SAMMS-MV Device

3.13 Ultimate Trip Level and Service Factor

The ultimate trip level is the maximum continuous current that

does not cause an overload trip. Any higher current applied

indefinitely to an unprotected motor will ultimately damage it.

The ultimate trip level for motors with a unity service factor is

110% of the full-load current setting. For motors with a service

factor of 1.15, the ultimate trip level is 120%. You can select a

service factor of 1.00 or 1.15 with HHC function F6.

3.14 Phase Unbalance

Unbalanced three-phase voltages or loss of one phase can

result in unbalanced currents being supplied to the motor.

Unbalanced currents include negative-sequence components

that produce heat in the motor winding, decreasing the effi-

ciency of the motor for a given load. The SAMMS-MV device

measures the magnitude of the current unbalance as the

maximum deviation from the average of the three-phase cur-

rents, divided by the average of the three-phase currents. In

case of loss of a phase, the unbalance is 100% in a three-wire,

ungrounded system.

With phase unbalance protection enabled, current unbalances

of between 20% and 40% cause the Phase Unbalance LED to

flash as a warning. If the unbalance increases to above 40%, the

Phase Unbalance LED illuminates solidly and overload tripping

accelerates. The effect of an unbalance of greater than 40% is

to shift the motor protection curve in the direction of faster

tripping.

You enable the phase unbalance protection using HHC function

F9.

• Enabled = ON

• Disabled = OFF

With phase unbalance protection enabled, HHC function F17

displays the percentage of current unbalance. Both functions

display OFF if phase unbalance protection is disabled.

enable jam protection using HHC function F23.

• enabled = ON

• disabled = OFF

3.17 Loss of Load Protection/Warning

(SAMMS-MVX Only)

If the running current of the motor suddenly drops below 20 to

95% (adjustable) of its previous reading in 360 msec, a loss of

load has occurred. Such a loss of load could be due to a broken

belt or loss of back pressure in a pump. Loss of load detection

is locked out for five times the overload class time after a start,

direction, or speed change (See Figure 3.11). You can select

loss of load protection or warning using HHC function F24.

• protection = ON

• warning = OFF

With protection selected, detection of a loss of load trips the

motor off-line and illuminates the External Trip LED. With

warning selected, the motor does not trip off-line and the

External Trip LED flashes until the current returns to its former

steady-state level or higher. SAMMS-MVX is normally shipped

with loss of load protection OFF (WARNING), and with default

setting of 50% I

FLC

.

3.18 Process Current Warning

(SAMMS-MVX Only)

It is often convenient to have an indication that the load current

is above its normal operating level so that the process can be

checked and, if necessary, adjusted. You can set the process

current warning from 0% (displayed as OFF) to 100% of the

full-load current with HHC function F22. As long as the motor

running current exceeds the process current warning level, the

External Trip LED flashes. Process current warning is locked out

for five times the class time after a start or a direction or speed

change.

3.15 Dual Overload Protection

(SAMMS-MVX Only)

Because the high-speed and low-speed currents differ in two-

speed motors, different full-load current settings are often

required. In such applications, use function F5 to select the full-

load current for low-speed operation.

3.16 Jam Protection (SAMMS-MVX Only)

Certain mechanical loads, especially those containing gears,

are susceptible to jamming. Jam protection can prevent dam-

age to the motor and the driven equipment by quickly tripping

the motor off-line in the event of a jam. If you have enabled jam

protection, you may adjust the jam trip level from 120-400% of

The jam trip time is 360 msec. SAMMS-MVX is normally

I

FLC.

shipped with jam protection enabled, with a trip level of 200%

(See Figure 3.11). Jam protection is locked out for 5 times

I

FLC

the overload class after a start, speed, or direction change. If the

jam limits are exceeded, the motor is tripped off-line and the

External Trip LED on the front panel solidly illuminates. You can

3.19 Stator Protection

By selecting the overload class slightly greater than or equal to

the motors starting time, the motor model defines an energy I

value. In this value, I equals 600% of the motors full load current

and t equals the overload class selected.

If the amount of energy exerted by the motor during start, stall

or under locked rotor condition exceeds the amount of energy

defined by the overload class selected, the SAMMS-MV device

will trip. This protects the motors winding against excessive

heat build up. For example, a typical motor starts within 3 to 4

seconds. By selecting an overload class 4 or 5, you can safely

start the motor hot or cold and without nuisance tripping. This

also provides protection against stall time exceeding 4 or 5

seconds; assuming the locked rotor current equals 600% of the

motors full-load current (See Figure 3.11).

3.20 Rotor Protection

Since medium-voltage motors are rotor limited under locked

rotor conditions, and stator limited under running conditions,

the SAMMS-MV device computes an accurate thermal signa-

23

2

t

3 Operating the SAMMS-MV Device

Boundary

Parameters

Class B

Insulation

Class F

Insulation

% Full Load

Temperature

Rise

Steady State

Temperature

rise at

full-load

current

80º C 105º C 100

Maximum

allowed

winding

temperature

140º C 185º C 175

ture of the rotor and provides a signal to trip the motor off-line

when it reaches a trip temperature value. The motor model

takes into account the change of the rotor resistance during

motor startup. Rotor resistance is a function of motor slip;

therefore, it is highest at locked rotor and decreases as the

motor speeds, and the slip decreases.

You can select motor cold stall time from 5 to 100 seconds in

increments of 1 second. The selected time will adjust the rotor

loop elements so that the maximum temperature limit in the

rotor is reached under locked rotor conditions for the time

selected. If cold stall time is not known, the rotor model will

assume a cold stall time based on the type of motor used. The

user is allowed to select an open drip proof (ODP) motor or a

totally enclosed fan-cooled motor (TEFC) motor. The default

value for the ODP motor is 10 seconds. The default value for the

TEFC motor is 20 seconds.

3.21 Repetitive Starts

The motor model allows repetitive starts without nuisance

tripping while protecting the motor against overload and stall

conditions. Repetitive starts can occur as long as the following

conditions are met:

1. The energy exerted by the motor during start does not

exceed the energy defined by the overload class selected.

2. The motor winding temperature does not exceed the maxi-

mum temperature allowed.

TEFC motors include the following types of motors:

• Totally Enclosed Fan Cooled

• Totally Enclosed Fan Cooled Explosion Proof

• Totally Enclosed Air-to-Air Cooled (TEAAC)

ODP motors include the following types of motors:

• Drip Proof Weather Protected I (WP-1)

• Weather Protected II (WP-2)

• Open Drip Proof

• Totally Enclosed Water-to-Air Cooled (TEWAC)

3.24 Normalized Temperature Rise for Class

B and Class F Insulation

Steady state and maximum winding temperature are functions

of the motors insulation class. In this motor model, normalized

temperature rise for both Class B and Class F insulation are

used. The motor winding temperature is displayed as a per-

centage of the steady-state full-load temperature rise as shown

in Table 3.5.

3. The rotor temperature does not exceed the maximum

temperature allowed.

4. The SAMMS-MV is not in start inhibit (See Section 3.22).

For example, a motor starting from cold condition could have

4 or more typical starts of 5 seconds without nuisance tripping

and without damaging the motor insulation. Figure 3.12 shows

a multi-start scenario for an ODP motor.

3.22 Start Inhibit

When the motor temperature reaches the maximum values

allowed, the SAMMS-MV device trips. If you attempt a restart,

the overload LED flashes and the motor will not start until the

motor winding and rotor temperatures cool down to the full load

temperature. HHC function F25 displays the motor winding

temperature as a percentage of the full-load temperature. HHC

function F10 displays the time to enable restart in seconds.

3.23 Cooling Time Constants

The motor time constant is a function of the motor type. The

values listed in Table 3.4 are used in the motor model.

Motor

Condition

Stopped 80º C to

Running Idle 80º C to

Table 3.4 Motor time constants

24

Delta

Temperature

29º C

39.4º C

Motor Type

TEFC ODP

9900 s 6000 s

7200 s 4500 s

Table 3.5 Steady state and maximum winding temperature rise

3.25 Ground Fault Detection

In SAMMS-MV devices, HHC function F12 selects ground fault

protection or warning.

• protection = ON

• warning = OFF

The device detects a ground fault if the fault current exceeds the

pickup level for 360 msec. If you have selected protection (ON),

the motor trips and the Ground Fault LED illuminates until reset.

If you selected warning (OFF), the Ground Fault LED flashes as

long as the fault current exceeds the pickup level. Table 3.6 lists

the pickup levels for each overload size. Ground fault protection

is locked out for 1.4 seconds following a start.

3 Operating the SAMMS-MV Device

Figure 3.12 Multi-start scenario for an ODP motor

25

3 Operating the SAMMS-MV Device

Size Pickup Current

Range

H3A 7A to I 10A

H3B 7A to I 10A

H3C 7A to I 10A

H6 7A to I 20A

Table 3.6 Ground fault pickup levels

Ground fault detection requires no additional external circuitry

or transformers. Ground fault detection for the SAMMS-MV

device is not available for grounded, three-phase systems or

single-phase applications. Ground fault pickup time is 360

msec.

FLC

FLC

FLC

FLC

Default Pickup

Current

3.26 Autoreset After a Trip (SAMMS-MVX

Only)

To restart the motor after a trip or a fault, you must first reset the

SAMMS-MVX device. You can reset the SAMMS-MV device in

one of two ways. First, press the Reset/Test button on the front

panel of the device. Second, enable the autoreset with HHC

function F8.

• enable = ON

• disable = OFF

With autoreset enabled, overload and external trips automati-

cally reset in 30 seconds after the trip. Once the reset occurs,

the SAMMS-MV device can be used to restart the motor, unless

the motor has reached its maximum temperature and has not

cooled down to the full-load level (start inhibit). Resetting after

a trip does not interrupt or otherwise affect the ongoing motor

thermal computations.

With the emergency restart function enabled (HHC function

F11), the motor can be restarted regardless of the residual heat.

If the SAMMS-MV device performs an emergency restart, the

winding, housing, and rotor temperatures in the motor model

computations reset to zero. Any time the motor is started,

whether an emergency restart or a normal start, the emergency

restart HHC function F11 is automatically reset to disable.

• enabled = ON

• disabled = OFF

3.28 Using the Hand Held Communicator

(HHC)

The HHC provides you with the capability to monitor and alter

various motor control and protection functions provided with

the SAMMS-MV device. For example, you can monitor and

alter control and protection settings such as on-delay time and

overload class. You can also monitor a variety of motor

operating conditions such as average current and elapsed

running time.

The SAMMS-MV device functions accessible through the HHC

are shown in Table 3.7 The number of functions available

depends upon the model of the SAMMS-MV device you are

using.

The HHCs small size makes it convenient to carry around and

use for communication with many SAMMS-MV devices. To use

the HHC, connect the HHCs cable, which uses a DB-9

connector, to the communication port located on the front

panel of the SAMMS-MV device. The HHC receives power and

control from the SAMMS-MV device. When connected to the

SAMMS-MV device, data is displayed on the HHC by a four-

character, seven segment liquid crystal display. When discon-

nected from the SAMMS-MV device, the HHC does not retain

or display data.

Once connected, you can access the functions provided by the

SAMMS-MV device through the use of the HHCs control keys.

The HHC has five (5) control keys: (F)unction, LIST, UP, DOWN,

and ENTER. The asterisk (*) key serves no function. The HHC

control keys are described in the following sections.

3.28.1 The (F)unction Key

When you press the (F)unction key, the function mode is

selected and the HHC displays the number of the selected

function preceded by F. With the HHC in the function mode, use

the UP and DOWN keys to step from one function to the next.

3.27 Emergency Restarting

In certain critical applications, you may want to restart a hot

motor even though restarting will damage or destroy the motor.

An emergency restart is a motor start that occurs after an

overload trip on maximum allowable winding, housing, or rotor

temperature; but before all have cooled down to the full-load

temperature level (100%) or below. In other words, an emer-

gency restart is a start that occurs before the restart time

displayed by HHC function F10 reaches zero.

26

3.28.2 The LIST Key

When you press the LIST key, the display mode is selected and

the HHC displays the value corresponding to the selected

function. If the selected function is a set point, the HHC displays

the actual setting. If the selected function is a measured

quantity, the HHC displays the value of the measured quantity.

In the display mode, use the UP and DOWN keys to step

through the range of possible set points for the selected

3 Operating the SAMMS-MV Device

SAMMS-MV

Function Number Function SAMMS-MVX SAMMS-MVE

F0 Ambient temperature

F1 Control circuit number

F2 Size for overload No. 1

F3 Size for overload No. 2 (low speed)

F4 Full load current for OLR No. 1

F4A 5A CT primary current (if used)

F5 Full load current for OLR No. 2

F5A 5A CT primary current (low speed) (if used)

F6 Service factor

F6A Motor type

F7 Overload trip class (class 2 through 23)

F7A Cold stall time

F8 Automatic reset

F9 Phase unbalance

F10 Time to restart

F11 Emergency restart

F12 Ground fault protection or warning

F12A Ground fault pickup current

F13 Timer No. 1

F14 Timer No. 2

F15 Motor current

F16 Last trip current

F17 Percent unbalance current

F18 Total elapsed run-time on motor

F19 Total number of motor starts

F20 Number of overload trips

F21 Reset motor data

F22 Set process current warning

F23 Jam protection

F23A Jam pickup current

F24 Loss of load protection or warning

F24A Loss of load pickup current

F25 Motor winding temperature as % of full load temperature

F26 Baud rate

F27 Address

Table 3.7 SAMMS-MV models and functions

• •

• •

• •

•

• •

• •

•

•

• •

• •

• •

• •

•

• •

• •

• •

• •

• •

• •

• •

• •

• •

• •

• •

• •

• •

• •

•

•

•

•

•

• •

• •

• •

27

3 Operating the SAMMS-MV Device

function. Pressing the LIST key returns the active setting to the

display.

There is one occasion when the LIST key is disabled making the

corresponding functions inoperative. In a SAMMS-MV device

with autoreset disabled at the factory, the LIST key has no effect

for F8.

3.28.3 UP and DOWN Keys

Use the UP and DOWN keys to step through the functions while

the HHC is in the function mode. When the HHC is in the display

mode, use the UP and DOWN keys to step through the values

for a selected function. You can use the keys in three ways:

1. Single step - press the key and release it.

2. Slow scroll - press the key and hold the key down for no

longer than a two or three seconds.

3. Fast scroll - press the key and hold the key down long

enough for the HHC to step through more than five steps.

The following information discusses how to operate the UP and

DOWN keys in the function and display modes.

1. In the function mode, the UP key increases the function

number by one and the DOWN key decreases the function

number by one. If F0 appears on the display, pressing the

DOWN key rolls the function over to the highest-numbered

function, F27. If the highest-numbered function (F27) ap-

pears in the display, pressing the UP key rolls the function

over to the lowest-numbered function (F0).

2. In the display mode, use the UP and DOWN keys to step

through the range of settings for each set point function. You

also use the UP and DOWN keys to step through the

individual line currents and the average line current of F15.

Just as the UP and DOWN keys cause the function numbers

to roll over, they also cause the range of settings to roll over.

3.28.4 Using the ENTER Key

Use the ENTER key to change settings on the HHC display. The

SAMMS-MV device disables the ENTER key under the follow-

ing conditions:

1. The ENTER key is disabled while the device is in the function

mode.

press the (F)unction key. The display shows the number of

the function most recently selected, (e.g. F9).

2. Use the UP or DOWN key (as described above) to step or

scroll to the desired function. The display shows the desired

function, (e.g. F4).

3. Press the LIST key. The display shows the active setting for

the selected function, (e.g. 112, representing a full-load

current setting of 112A for a motor controlled by a size H3B

contactor.)

4. Use the UP or DOWN key (as described above) to step or

scroll to the desired setting. The display shows the desired

setting, (e.g. 67 for 67A).

5. To view the active setting, press the LIST key. The number

112 appears on the display.

6. Repeat step 4 to return to the desired setting.

7. To enter the desired setting (67) which is displayed, press

the ENTER key. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

8. Press the LIST key to show the new setting (67) on the

display.

9. To move to the other functions, press the (F)unction key. The

display shows, in the example, F4.

10. Press the UP and DOWN keys to step through the function

numbers. The SAMMS-MV device is in the function mode.

11. To exit the program mode, press and hold the (F)unction

key for several seconds. The display will show Prog.

Press the UP or DOWN key to change to display mode.

3.29 Using the SAMMS-MV Device Func-

tions

This section lists the 28 major motor control and protection

functions and several related functions (F0-F27, F6A, F9A,

F12A, F23A, and F24A) and how to use them. The functions

available for each version of the SAMMS-MV device are shown

in table 3.7. Table 3.8 provides a description of each function

and its associated range, step size, and default value.

2. The ENTER key is disabled for non-setting functions that

display a parameter.

3. The ENTER key is disabled while the motor is running to

prevent settings from being changed while the motor is

running.

Use the following procedure to change a setting. This example

shows you how to change the full-load current setting from

112A to 67A.

1. With the HHC in the program mode (see section 3.29.1),

28

To access a function perform the following steps:

1. Connect the HHCs cable to the communications port on

the front of the SAMMS-MV device.

2. Locate the desired function using the (F)unction and UP and

DOWN keys.

3. Then locate and follow the steps provided with the function

you wish to perform.

3 Operating the SAMMS-MV Device

Function

Number

F0 Select ambient temperature. 0 - 70º C 5º C 40º C

F1 Display (or change for SAMMS-MVE)

F2 Display the size for single-speed

F3 Display the low-speed size for

F4 Select the full-load current setting (I )

F4A Display the primary current if 5A

F5 Select the full-load current setting (I )

F5A Display the primary current if 5A

F6 Select the service factor. 1 or 1.15 N/A 1.15

Function Description Range Step Size Default Value

0 - 9999 1 N/A

the control circuit number,

Enable/disable incomplete sequence

status.

H3A, H3B, H3C, H6 As shown N/A

controller, or the high-speed size for

two-speed motor controllers.

H3A, H3B, H3C, H6 As shown N/A

two-speed controller. F3 is OFF for

single-speed motor controllers.

for the size for single-speed motor

controller or the high-speed size for

two-speed motor controllers.

secondary CT's are used.

for the low-speed size for two-speed

motor controllers. F5 is OFF for single

speed motor controllers.

secondary CT's are used.

H3A: 18 - 72A

FLC

H3B: 60 - 240A

H3C: 192 - 400A

H6: 320 - 720A

Function of size in F2 Function of size in F2 OFF (denotes

H3A: 18 - 72A

FLC

H3B: 60 - 240A

H3C: 192 - 400A

H6: 320 - 720A

Function of size in F3 Function of size in F3 OFF (denotes

1A

1A

1A

2A

1A

1A

1A

1A

18

60

192

320

SAMMS sensors

in use)

18

60

192

320

SAMMS sensors

in use)

F6A Select type of motor. ODP or EFC N/A ODP

F7 Select the overload trip class. 2-23 1 10

F7A Select cold stall time. 5-100 1 10 (ODP) /

F8 Enable/disable autoreset of overload

and external trips.

F9 Enable/disable phase unbalance

protection.

F10 Display the time to wait until the motor

can be restarted. Applies after an

overload trip with the winding, housing,

or rotor temperature above the

maximum allowed for restarting.

F11 Enable/disable the emergency restart

capability.

Table 3.8 Motor control and protection functions (page 1 of 2)

ON/OFF N/A OFF

ON/OFF N/A ON

Real Time Value 1s N/A

ON/OFF N/A OFF

20 (EFC)

29

3 Operating the SAMMS-MV Device

Function

Function Description Range Step Size Default Value

Number

F12 Select ground fault protection or

ON/OFF N/A OFF

warning. ON means protection; OFF

means warning.

F12A Select ground fault pick-up current

value.

7A-I 1A 10A (H3A-H3C)

FLC

20A (H6)

F13 Set programmable timer #1. OFF - 200 seconds 1 second OFF

F14 Set programmable timer #2. OFF - 200 seconds 1 second OFF

F15 Display the average line current and the

individual line currents.

F16 Display the most recent trip current. H3A: 0 - 720A

F17 Display the percentage current

H3A: 0 - 720A

H3B: 0 - 2400A

H3C: 0 - 4000A

H6: 0 - 7200A

H3B: 0 - 2400A

H3C: 0 - 4000A

H6: 0 - 7200A

1A

1A

1A

2A

1A

1A

1A

2A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

0 - 100% 1% N/A

unbalance. OFF is displayed if

unbalanced protection is off.

F18 Display the elapsed motor running time

in tens of hours.

0.0 - 6553 (x 10 hr.) 0.1x10hr.

up to 999.9,

N/A

1x10hr.

up to 6553

F19 Display the number of motor starts in

tens of hours.

0.0 - 6553 (x 10) 0.1x10

up to 999.9,

N/A

1x10

up to 6553

F20 Display the number of overload trips. 0 - 9999 1 N/A

F21 Reset motor data. Zeroes the elapsed

N/A N/A N/A

running time, the number of starts, and

the number of overload trips.

F22 Set process current warning 0-100% I 1% I OFF

FLC

FLC

F23 Jam protection ON/OFF N/A ON

F23A Select jam pickup current 120-400% I 5% 200%

FLC

F24 Loss of Load ON/OFF N/A ON

F24A Select loss of load pickup current 20-95% of running

5% 50%

current

F25 Display percentage of motor winding

0 to 250% 1% N/A

temperature

F26 Select baud rate 2400/4800/9600 N/A 4800

F27 Select address 1-224 1 200

Table 3.8 Motor control and protection functions (page 2 of 2)

30

3 Operating the SAMMS-MV Device

Press and hold F key

F

UP DOWN

Display

mode

ENTER ENTER

Program

mode

Prompt for

password

To change

password

UP DOWN

Enter new
password

twice

UP DOWN

ENTER

ENTER

To select function

for viewing

Prompt for

new password

To select

digit

To enter

digit

First digit

selected

Enter following

digits in the

same manner

0000-9999

ENTER

No

UP DOWN

UP DOWN

ENTER

ENTER

UP DOWN

To select

digit

To enter

digit

Password

Correct?

Yes

To select function

to change settings

First digit

selected

Enter following

digits in the

same manner

0000-9999

Authorized to

change settings

Password

No

entered

twice?

Yes

Figure 3.13 Entering and changing passwords

ENTER

31

3 Operating the SAMMS-MV Device

3.29.1 Program Mode/Passwords

To access the functions in program mode, the user is required

to enter a password. The default password is 0000, and may

be changed at any time. To enter the password and have

access to program mode:

1. Press and hold the (F)unction key for several seconds until

dISP is displayed.

2. Press the UP or DOWN key to change to the program mode.

The display reads Prog.

3. Press the ENTER key, and the display shows HHH0, the

prompt for entering the password.

4. Press the UP or DOWN key to select the first digit, then press

ENTER. The display reads HH0-.

5. Continue to select password digits and press ENTER to

enter each digit.

6. After correctly entering the four digit password, the display

reads - - - -, and pressing ENTER gives access to the

functions in program mode.

7. If the password was entered incorrectly, the display will read

Err. Press the ENTER key to return to program mode and

try again.

To change the password:

1. Enter the password as described above.

2. With the password entered and the display showing - - - -,

press the UP or DOWN key to enter change mode. The

display reads CHg.

3. Press the ENTER key, and the display shows HHH0, the

prompt for entering the new password.

4. Enter the new password in the same way described above.

After entering all four digits of the new password, the display

will again display HHH0.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

F1 - Control Circuit Number and Incomplete Se-

quence Status

1. Press the LIST key to view the control circuit number

programmed at the factory. The circuit numbers range from

0 through 9999. (The UP, DOWN and ENTER keys become

disabled.)

2. For SAMMS-MVE, to change the settings, you must be in

the program mode. The available selections are program

blocks 10-16 (refer to table 3.3). If you have loaded a custom

circuit, the designation for that circuit will be shown.

3. Press the UP or DOWN key to scroll through the range of

circuit numbers, until the desired circuit number appears on

the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

7. To enable or disable incomplete sequence, press the EN-

TER key for a period of one second or more. A . will be

displayed after the F1 on the HHC if incomplete sequence

is enabled. (The SAMMS-MV is shipped from the factory

with the incomplete sequence enabled.)

5. Enter the new password a second time. If it was entered

correctly the display reads donE, and pressing ENTER

gives access to the functions in program mode.

6. If the password was entered incorrectly, the display will read

Err. Press the ENTER key to return to program mode and

try again.

3.29.2 SAMMS-MV Functions

F0 - Ambient Temperature

1. Press the LIST key to view the ambient temperature se-

lected. The default value is 40° C and the range of possible

values is from 0° C to 70° C in increments of 5° C.

2. To change the setting, you must be in program mode.

32

F2 - Size for Overload Relay #1

Overload relay #1 protects single-speed motors and two-

speed motors running on high speed. The possible values are

H3A, H3B, H3C and H6. Use the following procedure to display

the size for overload relay #1.

1. Press the LIST key to view the size selected for overload

relay #1.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

3 Operating the SAMMS-MV Device

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

F3 - Size for Overload Relay #2 (SAMMS-MVX Only)

Overload relay #2 protects two-speed motors running on low

speed. The possible values are H3A, H3B, H3C, H6 and OFF.

OFF appears for single-speed motors. Use the following proce-

dure to display the size for overload relay #2.

1. Press the LIST key to view the size selected for overload

relay #2.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

F4 - Full-Load Current for Overload Relay #1

1. Press the LIST key to view the active full-load current setting

for overload relay #1. The setting should normally be the full

load current as shown on the motor nameplate (high speed

for two-speed machine). The range of possible settings and

the factory default value depend on the size displayed in F2

as follows:

Overload

Relay Size

Setting

Range

Step Default

H3A 18 to 72A 1A 18

F4A - 5A CT Primary Current Selection for Overload

Relay #1

SAMMS-MV is normally used with SAMMS sensors to provide

the current input signals to the device. Optionally, SAMMS-MV

may be used with conventional 5A secondary current trans-

formers.

1. Press the LIST key to view the sensor in use for overload

relay #1. If standard SAMMS sensors are used, the display

will read OFF. If 5A secondary CTs are in use, the CT

primary current will be displayed.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F5 - Full-Load Current for Overload Relay #2

(SAMMS-MVX Only)

1. Press the LIST key to view the active full-load current setting

for overload relay #2. This setting should normally be the full

load current for the low speed shown on the motor name-

plate. The range of possible settings and the factory default

value depend on the size displayed in F3. The values are

similar to those found in the table in the procedure for F4. If

the control is not a two-speed control, OFF appears on the

display, and UP, DOWN and ENTER keys become disabled.

H3B 60 to 240A 1A 60

H3C 192 to 400A 1A 192

H6 320 to 720A 2A 320

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings until the selected setting appears.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. (If you make an incorrect selection, repeat

steps 3 and 4).

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings until the selected setting appears.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. (If you make an incorrect selection, repeat

steps 3 and 4).

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F5A - 5A CT Primary Current Selection for Overload

Relay #2 (SAMMS-MVX Only)

SAMMS-MV is normally used with SAMMS sensors to provide

the current input signals to the device. Optionally, SAMMS-MV

may be used with conventional 5A secondary current trans-

formers.

33

3 Operating the SAMMS-MV Device

1. Press the LIST key to view the sensor in use for overload

relay #2. If standard SAMMS sensors are used, the display

will read OFF. If 5A secondary CTs are in use, the CT

primary current will be displayed.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F6 - Service Factor

1. Press the LIST key to view the active service factor, 1.0 or

1.15. The factory default is 1.15. A service factor of 1.15

adjusts the overload trip thresholds up by 15% over their

values for a service factor of 1.0. This results in more margin

before tripping.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to

alternate between the two choices until the selected value

is displayed.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. (If you make an incorrect selection, repeat

steps 3 and 4.)

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog.Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F7 - Overload Trip Class

The trip class is the time in seconds that it takes the overload

relay to trip for a starting current of 600% of the full-load current

setting. The range of possible values is 2-23.

1. Press the LIST key to view the active trip class.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to scroll

through the range of settings until the selected setting

appears.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. (If you make an incorrect selection, repeat

steps 3 and 4.)

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog.Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F7A - Cold Stall Time

1. Press the LIST key to view the active cold stall time in use.

(The range of possible values is between 5 and 100 seconds

in increments of one second. The factory default value is 10

seconds. If the cold stall time is more than 100 seconds,

enter 100.

2. To change the setting, you must be in program mode.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F6A - Motor Type

1. Press the LIST key to view the motor type in use. The factory

default is OdP for open drip proof. EFC designates

totally enclosed fan cooled.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to

alternate between the two choices until the selected value

is displayed.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. (If you make an incorrect selection, repeat

steps 3 and 4.)

34

3. To change the setting, press the UP or DOWN key to scroll

through the range of settings until the selected setting

appears.

4. Press the ENTER key to change the active setting to the

selected value. The display becomes blank while you hold

down the ENTER key, and the SAMMS-MV device stores

the new setting. If the overload class selected exceeds the

cold stall time, the word SUrE appears on the display

requiring reentry before accepting the data.

Important: The word SUrE is used as a reminder that

supplemental protection is required if the motor acceleration

time (overload class) exceeds the allowable stall time for the

motor. A speed switch should be used as an input source to

open the contactor if the switch senses a locked rotor or stall

condition.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

3 Operating the SAMMS-MV Device

F8 - Autoreset (SAMMS-MVX Only)

1. Press the LIST key to view the active autoreset setting, either

ON or OFF. If autoreset is ON, the SAMMS-MV device

automatically resets 30 seconds after an overload or exter-

nal trip. At this time the motor can start. If autoreset is OFF,

you must manually reset the overload relay with the Reset/

Test button before restarting the motor. The factory default

is OFF.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to select

the new setting.

4. Press and hold the ENTER key. If the displayed setting is

ON, go to step 6. If the displayed setting is OFF go to step

5.

5. Release the ENTER key while the display appears blank.

When you release the key, the setting changes to OFF. Go

to step 6.

6. Release the ENTER key. SUrE appears on the display.

7. Press the ENTER key to make the change to ON.

Note: The reason for displaying SUrE and requiring you to

press the ENTER key a second time is because the motor can

restart immediately after an overload trip if autoreset is ON.

8. If you made an incorrect selection, repeat steps 3 through

7.

9. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

10.Press the (F)unction key to step through other functions.

F9 - Phase Unbalance Protection

1. Press the LIST key to view the active phase unbalance

protection setting (ON or OFF). The factory default setting is

ON.

a. When phase unbalance protection is enabled (ON), cur-

rent unbalances of greater than 40% accelerate overload

tripping. The Phase Unbalance LED flashes for unbal-

ances between 20% and 40%. It remains steadily illumi-

nated for unbalances greater than 40%.

b. When phase unbalance protection is disabled (OFF), the

Phase Unbalance LED remains off, unbalanced condi-

tions have no effect on protection, and F17 (Display

Unbalanced Current) displays OFF.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to display

the setting options, then press ENTER to select the setting

that is shown. The display blanks while the ENTER key is

pressed.

4. Repeat Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F10 - Display Time to Restart

1. Press the LIST key to view the time remaining before the

motor can be restarted. The time is displayed in seconds.

While the motor is cooling, the time to restart counts down

from the maximum winding or rotor temperature allowed to

the steady-state, full-load temperature. The display is al-

ways zero if the motor is not in a start inhibit mode. If a time

to restart displays, the motor can only be restarted by an

emergency restart (see F11).

2. The UP, DOWN, and ENTER keys are disabled.

3. Press the (F)unction key to go to other functions.

F11 - Emergency Restarting

1. Press the LIST key to view the emergency restart setting (ON

or OFF). The factory default is OFF. With emergency restart

enabled (ON), you can restart the motor after the overload

relay is reset (manually or automatically), even when the time

to reset is not zero. When you initiate an emergency restart,

the motor conditions are reset to zero to simulate a com-

pletely cold start. The emergency restart function is auto-

matically disabled after any restart (emergency or normal),

and you must manually re-enable the emergency restart

function by setting F11 to ON.

2. Emergency restart can be enabled in either the program

mode or the display mode.

3. To change the setting, press the UP or DOWN key to display

the setting options, then press ENTER to select the setting

that is shown. If the selected setting is ON, skip to Step 5.

4. If the selected setting is OFF, the display blanks while the

ENTER key is pressed. When the ENTER key is released, the

setting is changed to OFF. Skip to Step 6.

5. If the selected setting is ON, SUrE is displayed when you

release the ENTER key. Press ENTER again to make the

change to ON.

Note: The motor can be damaged if restarted before it is

allowed to cool. The SUrE display allows you to reconsider

35

3 Operating the SAMMS-MV Device

your actions before pressing the ENTER key a second time

to select the ON setting.

6. Repeat Step 3 if you select an incorrect setting.

7. If you are in the program mode, press and hold the (F)unction

key for several seconds to exit. The display will show Prog.

Press the UP or DOWN key to change to the display mode.

8. Press the (F)unction key to go to other functions.

F12 - Ground Fault Protection or Warning

1. Press the LIST key to view the active ground fault detection

setting (ON or OFF). The factory default setting is warning

(OFF), and the other setting is protection (ON).

a. When warning (OFF) is selected, the Ground Fault LED

flashes if the ground current increases beyond the pickup

level. The LED stops flashing as soon as the current drops

below the pickup level.

b. When protection (ON) is selected, a ground current above

the pickup level will cause a trip. The motor stops, and the

Ground Fault LED is steadily lit. You must reset the unit

before the motor can be restarted.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to display

the setting options, then press ENTER to select the setting

that is shown. The display blanks while the ENTER key is

pressed.

4. Repeat Step 3 if you select an incorrect setting.

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F13 - Set Programmable Timer #1

1. Press the LIST key to view the active setting for timer #1. The

default setting is OFF. If the timer is not used in the control

circuit, OFF is displayed and the UP, DOWN, and ENTER

keys are disabled. OFF is also displayed for a setting of 0

seconds. The timer may be adjusted from 0 - 200 seconds

in one second increments.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key until the

desired value is displayed then press the ENTER key to

select the setting. The display blanks while the ENTER key

is pressed.

4. Repeat Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F14 - Set Programmable Timer #2

1. Press the LIST key to view the active setting for timer #2. The

default setting is OFF. If the timer is not used in the control

circuit, OFF is displayed and the UP, DOWN, and ENTER

keys are disabled. OFF is also displayed for a setting of 0

seconds. The timer may be adjusted from 0 - 200 seconds

in one second increments.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F12A - Ground Fault Pickup Current

1. Press the LIST key to view the active ground fault pickup

current in use. The range of values and default values are

shown in the table below:

Size Pickup Current Default

H3A-H3C 7A-I 10A

H6 7A-I 20A

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key to display

the setting options, then press ENTER to select the setting

that is shown. The display blanks while the ENTER key is

pressed.

4. Repeat Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

FLC

FLC

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key until the

desired value is displayed then press the ENTER key to

select the setting. The display blanks while the ENTER key

is pressed.

4. Repeat Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F15 - Display Current

1. Press the LIST key to view the instantaneous line currents or

the average instantaneous line current. (The LIST key is

disabled for full voltage, part-winding starters.) For instanta-

neous line currents, the display shows the phase designator

(A, b , or C) in the left-most character followed by three

significant digits of the value of the current. For the average

instantaneous line current, four digits are displayed without

a phase designator.

36

3 Operating the SAMMS-MV Device

a. Because only four characters can display at a time,

individual line currents of 1000 amps and above are

displayed as three dashes following the phase designa-

tor, e.g., A - - -.

b. For sizes H3A, H3B, and H3C, the current is displayed to

the nearest 1 amp. For size H6, currents are displayed to

the nearest 2 amps.

2. To view another line current, press the UP or DOWN key to

scroll through the four selections.

Note: The value can be reset to zero with F21.

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F19 - Number of Motor Starts

1. Press the LIST key to view the number of motor starts. The

number of starts is displayed in tens of starts as follows:

Actual Number of Starts Displayed Number

3. The ENTER key is disabled for this function.

4. Press the (F)unction key to go to other functions.

F16 - Trip Current

1. Press the LIST key to view the value of the current that

caused the most recent trip.

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F17 - Current Unbalance

1. Press the LIST key to view the percentage current unbal-

ance. When unbalance protection is disabled (F9 = OFF),

OFF is displayed. The percentage unbalance is the ratio of

the greatest deviation of the three phase currents from their

average to the average of the three phase currents ex-

pressed as a percentage.

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F18 - Display Total Elapsed Run Time of the Motor

1. Press the LIST key to view the total elapsed running time of

the motor. The run time is displayed in tens of hours as

follows:

Actual Number of Hours Displayed Time

0 0.0

9999 999.9

10000 1000

65535 6553

65536 0.0 (roll over)

0 0.0

9999 999.9

10000 1000

65535 6553

65536 0.0 (roll over)

Note: The value can be reset to zero with F21.

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F20 - Number of Overload Trips

1. Press the LIST key to view the number of overload trips, up

to 9999.

Note: The value can be reset to zero with F21.

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F21 - Reset Motor Data

1. To reset to zero the elapsed running time, the number of

starts, and the number of overload trips, press the LIST key.

CLr is displayed.

2. Press the ENTER key. SUrE is displayed.

3. Press the ENTER key again to zero the motor data.

4. To return to Step 1, press the LIST key at any time.

5. The UP and DOWN keys are disabled for this function.

6. Press the (F)unction key to go to other functions.

The displayed value does not increment until a full hour, or for

elapsed times greater than 10000 hours a full ten hours, have

elapsed. Internally, however, the elapsed time is maintained

to the nearest 0.1 second.

37

3 Operating the SAMMS-MV Device

F22 - Process Current Warning Level (SAMMS-MVX

Only)

1. Press the LIST key to view the active process current level.

The value represents the percentage of the full load current

setting above which a motor current causes the External

Trip LED to flash. The function is disabled for five times the

class time after starting, or after a speed or direction

change. The range of settings is in 1% increments from zero

(OFF) through 100. The factory default is OFF.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key until the

desired setting is displayed then press the ENTER key to

select the setting. The display blanks while the ENTER key

is pressed.

3. Return to Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F23 Jam Protection (SAMMS-MVX Only)

1. Press the LIST key to view the active jam protection setting

(ON or OFF). The factory default setting is ON. If jam

protection is enabled (ON) and the motor running current

increases to the pickup current value within 360 msec, the

motor will trip off-line and the External Trip LED is steadily lit.

The function is disabled for five times the class time after

starting, or after a speed or direction change.

2. To change the setting, you must be in program mode.

3. To change the protection setting, press the UP or DOWN

key to display ON or OFF, then press ENTER to select the

setting that is shown. The display blanks while the ENTER

key is pressed.

4. Return to Step 3 if you select an incorrect setting.

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

5. Press the (F)unction key to step through to another function.

F24 - Loss of Load Protection or Warning

(SAMMS-MVX Only)

1. Press the LIST key to view the active loss of load setting (ON

or OFF). The factory default setting is warning (OFF), and the

other setting is protection (ON). This function is disabled for

five times the class time after starting or speed or direction

changes.

a. When protection (ON) is selected and the motor current

drops below the pickup current value, within 360 msec,

the External Trip LED will light and the SAMMS-MV trips.

b. When warning (OFF) is selected and the motor current

drops below the pickup current value within 360 msec,

the External Trip LED flashes but the SAMMS-MV does

not trip.

2. To change the setting, you must be in program mode.

3. To change the protection setting, press the UP or DOWN

key to display ON or OFF options, then press ENTER to

select the setting that is shown. The display blanks while the

ENTER key is pressed.

4. Return to Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F24A - Loss of Load Pickup Current (SAMMS-MVX

Only)

1. Press the LIST key to view the active setting. The range of

possible values is between 20% and 95% to the FLC, in

increments of 5%. The factory default is 50%.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F23A Jam Pickup Current (SAMMS-MVX Only)

1. Press the LIST key to view the jam current pickup value in

use. The range of possible values is between 120% and

400% to the FLC, in increments of 5%. The factory default

is 200%.

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key until the

desired setting is displayed then press the ENTER key to

select the setting. The display blanks while the ENTER key

is pressed.

4. To exit the program mode, press and hold the (F)unction key

38

2. To change the setting, you must be in program mode.

3. To change the setting, press the UP or DOWN key until the

desired setting is displayed then press the ENTER key to

select the setting. The display blanks while the ENTER key

is pressed.

4. Return to Step 3 if you select an incorrect setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to go to other functions.

F25 - Percentage of Motor Winding Temperature

1. Press the LIST key to view the temperature of the motor

windings as a percentage of the steady-state, full-load

winding temperature. The maximum allowable winding tem-

perature percentage is 175%.

3 Operating the SAMMS-MV Device

2. The UP, DOWN, and ENTER keys are disabled for this

function.

3. Press the (F)unction key to go to other functions.

F26 - Baud Rate

1. Press the LIST key to view the active setting. Allowable

settings are 2400, 4800, or 9600 baud. The factory default

is 4800.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

F27 - Address

1. Press the LIST key to view the active setting. Allowable

addresses are 1-224. The factory default is 200.

2. To change the setting, you must be in program mode.

3. Press the UP or DOWN key to scroll through the range of

settings, until the selected setting appears on the display.

4. Press the ENTER key to change the active setting to the

selected setting. The display becomes blank while you hold

down the ENTER key and the SAMMS-MV device stores the

new setting.

5. To exit the program mode, press and hold the (F)unction key

for several seconds. The display will show Prog. Press the

UP or DOWN key to change to the display mode.

6. Press the (F)unction key to step through to another function.

39

4 Troubleshooting

4 Troubleshooting the SAMMS-MV
Device

This section discusses how to troubleshoot the SAMMS-MV
device. The troubleshooting guide below lists basic errors that
can occur while operating the SAMMS-MV device. Use the
guide as necessary to solve error conditions as they arise. Do
not attempt to solve any error condition that is not listed in the
troubleshooting guide. Instead, contact your Siemens repre­sentative.

Note: When contacting your Siemens representative, refer to
the SAMMS-MV production control label to identify production
date, hardware version, and software version. This label is
mounted on the right side of the unit when viewed from the front.
For example, 93-250-456-01/03 represents a device that was
produced in 93, the 250th day of the year, unit number 456,
hardware version 01, and software version 03.

Troubleshooting Guide

Error Condition Main Cause Remedy

Current Unbalance Current unbalance LED is illuminated if

current unbalance exceeds 40%, or it
flashes if current unbalance is between
20 and 40%. Current unbalance may
be due to voltage or load unbalance.

Overload Trip Indicates motor exceeded winding,

housing, or rotor temperature
threshold.

1.2.Correct the cause of voltage or load unbalance.
Verify current transformer secondary voltage is

unbalanced at SAMMS-MV terminals 1, 2, and 3 with
reference to 4.

1.

Verify that the full load current F4 and service factor
F6 on the HHC matches the full load current and the
service factor on the motor nameplate.

2.

If the motor tripped during start, increment the
overload class one step and start again. If still
unsuccessful, the motor’s rotor may be locked or
stalled. Correct motor malfunction before restarting.

3.

If the motor tripped after running for a period more
than the overload class selected, the trip may be due
to a running overload such as excessive loading on a
conveyor belt or bad bearings. Remove the cause of
the overload before restarting the motor.

4.

F16 on HHC displays the most recent overload trip
current value.

40

Troubleshooting Guide

Error Condition Main Cause Remedy

4 Troubleshooting

Incomplete
Sequence

External Trip If the external trip LED is solidly

Indicates the SAMMS-MV unit does not
detect current one second after a start
command, or it detects current one
second after a stop command.

illuminated and the motor is stopped, it
indicates a jam or loss of load
condition, or a trip caused by an
overtemperature indication from an
RTD.

1.

If the unit trips one second after start, verify that
current transformer secondary input is present in the
range of 100 mVAC to 3.54 VAC at terminals 1, 2,
and 3 with reference to 4. Verify that the coil voltage
is 115 VAC at terminals 14, 15, or 16 with reference
to 13 when the motor is started. Verify 115 VAC at
terminal 7 with reference to 13. Correct conditions if
necessary. Call Siemens if unit continues to trip.

If the unit trips one second after a stop command,

2.
verify the contactor is open. Repair or replace the
contactor if it is not functioning properly.

Verify operation of mechanical interlock, and replace

3.
or adjust.

Verify absence of voltage at terminals 1, 2, and 3 with

4.
reference to 4, and at terminals 14, 15, or 16 with
reference to 13. If voltage is present, define the
source and reconnect so that the motor current only
passes through the current transformer.

To disable incomplete sequence, select F1 on the

5.
HHC, press the ENTER key for one or more seconds
and start the motor. The incomplete sequence will
remain disabled until the above procedure is
repeated.

1.

Jam conditions such as a blocked conveyor belt or
gear train cause a sudden increase in motor current,
which can damage the motor’s insulation in a short
period of time.

Loss of load conditions, such as a broken blade of an

2.
impeller or loss of back pressure of a pump, result in
a sudden decrease in motor current.

RTD trip indicates that the stator temperature or the

3.
temperature of one of the bearings has exceeded its
threshold.

RTD stator trip indicates either that the motor cooling
system is blocked, or that the fan is broken.

RTD bearing trip indicates overheating of the motor or
load bearings.

In any case, the motor should not be restarted until
the cause of the overheating has been corrected.

F16 on the HHC displays the external trip current at

4.
the time of the trip, or the RTD number which caused
the trip.

In any case, determine the reason for the external trip
and correct the problem before restarting the motor.
If the external trip LED flashes and the motor
continues to run, it indicates loss of load warning or
process current warning.

41

4 Troubleshooting

Troubleshooting Guide

Error Condition Main Cause Remedy

CPU Fault Indicates a problem in the

microprocessor or a low voltage
condition.

Ground Fault Indicates the ground fault current

exceeded the threshold. If ground fault
protection was selected, the ground
fault LED illuminates solidly and the
motor stops. If ground fault warning
was selected, the ground fault LED
flashes and the motor continues to run.

Ready Light not
Illuminated

Improper Remote
Operation

Usually indicates lack of control power. 1.

Indicates connection or operator error. 1.

Verify voltage between terminals 5 and 6 is more than
10 VAC. If fault persists, call Siemens.

The cause of the ground fault should be determined
and removed before using the motor again. F16 on
the HHC displays the ground fault trip current.

Verify the presence of 12 VAC between terminals 5
and 6 of the SAMMS-MV unit.

2.

If control power is not present, check the control
power fuses or the control power transformer and
replace if defective.

3.

If control power is present, push the RESET button to
test lights and unit. If the Ready light does not
illuminate, call Siemens.

Verify the SAMMS-MV unit is in the Auto mode.

2.

Verify 115 VAC input at SAMMS-MV terminals 9, 10,
11, and 12 with reference to 13, and at terminal 7
with reference to 13.

Improper Alarm
Contact Operation

Improper Light
Operation

Improper Local
Operation

Improper Contactor
Operation

Cannot Change
HHC Settings

Improper
SAMMS-MV
Operation

3.

If remote operation is intermittent, verify connections
are made in a manner to avoid noise interference.
Refer to Section 2 of this manual for instructions.

Indicates connection error. Verify 115 VAC at terminals 7 and 8 with reference to

13.

Usually indicates programming error. 1.2.Perform lamp test by pressing RESET button.

Verify ladder diagram.

Operator error. Verify SAMMS-MV is in Local mode.

Connection error. Verify 115 VAC at terminal 7 with reference to 13,

and at output terminals 14, 15, or 16 with reference
to 13 when the motor is started.

Usually indicates motor is running. Change parameters after motor is stopped.

Usually indicates improper grounding
or noise interference.

Refer to Section 2 of this manual for instructions.

42

Appendix A Technical Specifications

Appendix A - Technical Specifications of the SAMMS-MV Device

MMoottoorr CCoonnttrrooll SSppeecciiffiiccaattiioonnss

Inputs Six pushbuttons

Four remote inputs

Outputs SAMMS-MVX:

Three coil drivers
Three light bars
One programmable alarm contact

SAMMS-MVE:
One coil driver
Two light bars

Diagnostic LEDs * Current unbalance

* Impending trip
* Overload trip
* External trip
* Incomplete sequence
* Ground fault
* CPU fault
* Ready
* Light bar flashes (timer timing)
* Impending trip LED flashes (motor temperature warning)
* Overload trip LED flashes (start inhibit)
* CPU LED ON (momentary loss of voltage)

Current Ranges:
18 - 72A
60 - 240A
192 - 400A
320 - 720A

PPeerrmmiissssiibbllee CCTT RRaattiiooss

5A secondary CT ratios (functions
F4A & F5A)

Overload Relay Size:
H3A
H3B
H3C
H6

Overload Relay Size

H3A
H3B

H3C

H6

Permissible CT Ratios
30:5, 40:5, 50:5, 75:5, 100:5
100:5, 150:5, 200:5, 250:5, 300:5, 400:5
300:5, 400:5, 500:5, 600:5
500:5, 600:5, 800:5, 1000:5

43

Appendix A Technical Specifications

OOvveerrllooaadd SSppeecciiffiiccaattiioonnss
Overload classes Overload classes 2 through 23 with one second increments.
Trip Characteristics Tripping time at 6 x I = 95% of the overload class (±5%).

Tripping time at 1.5 x I within two minutes for warm conditions for all classes.

Tripping threshold (1.1 ± 0.05) x I for motors with 1.00 service factor, and

(1.2 ± 0.05) x I for motors with 1.15 service factor.
Tripping time 20 minutes @1.15 x I for motors with service factor 1.
Mechanical jam protection

SAMMS-MVX only

Sudden increase of the motor running current. Pick-up current adjustable from 120 to

400% in increments of 5% of I . Pick-up time 360 msec.

Default values: 200% I .
Loss of load protection

SAMMS-MVX only

Sudden decrease of motor running current. Pick-up current adjustable form 20 to 95% in

increments of 5% of I . Pick-up time 360 msec.

Default values: 50% I .
Process current warning

Settings from 0 to 100% of I .

FLC

FLC

FLC
FLC

FLC

FLC

FLC

FLC

FLC

FLC

SAMMS-MVX only
Accuracy ± 5% of overload trip curve values.

± 2% repeat accuracy.
Phase unbalance protection Response time after 1 second

Shifted trip threshold value to 0.9 x I at 40% phase unbalance.

FLC

Equipment ground fault protection Response time after 1.4 seconds.

Pick-up time: 360 msec.

Pick-up current:

Overload Relay Size Pick-up Current Default

H3A 7A- I 10A

H3B 7A- I 10A

H3C 7A- I 10A

H6 7A- I 20A

FLC
FLC

FLC

FLC

Rotor protection Cold stall time adjustable from 5 to 100 seconds in increments of 1 second. If cold stall

time is not known, default value shall be according to the type of motor used.

Motor Type Cold Stall Time

Open Drip Proof (ODP) 10 Seconds

Totally Enclosed Fan Cooled (EFC) 20 Seconds
Ambient temperature Motor ambient temperature adjustable 0 - 70°C in increments of 5°C.

Default value: 40°C.

44

Appendix A Technical Specifications

SSttaattiissttiiccaall DDaattaa

Elapsed motor running time - x10

- Range: 0.0 to 6553 (65,536 hours)

- Unit increments: 10 hours

Number of motor starts - x10

- Range:0.0 to 6553 (65,536 hours)

- Unit increments: 10 operations

Number of overload trips - Range: 0 to 9999

- Increments: 1 trip

Current display Overload Relay Size Current Increments

H3A 1A

H3B 1A

H3C 1A

H6 2A

AAllaarrmm CCoonnttaaccttss ((SSAAMMMMSS--MMVVXX OOnnllyy))

Configuration - N.C.

- N.O.

Functions - Impending Trip

- Overload Trip

- External Trip

- Ground Fault

- All of the above

SSooffttwwaarree CCoonnffiigguurreedd CCoonnttrrooll DDeevviicceess
Timers 4
Timing range Timers 1 and 2: 0 - 200 seconds selectable

Timer 3: 1 second fixed value

Timer 4: 30 seconds fixed value
Timer auxiliary contacts Software instantaneous and timed contacts
Control relays 8
Auxiliary contacts Software instantaneous contacts

45

Appendix A Technical Specifications

DDiimmeennssiioonnss
SAMMS-MV 6.25 inches W; 6.00 inches H; 2.125 inches D
Handheld Communicator 3.15 inches W; 5.7 inches H; 1.37 inches D

EEnnvviirroonnmmeennttss
Operating temperature range -25º C to +70º C.
Storage temperature -40º C to +85º C.
Relative humidity 5 to 95% non-condensing.
Altitude 6600 ft.
Vibration 5 g's at a frequency range of 10 to 60 Hz.
Electrostatic discharge No hardware failures at 15 kV at any point in the front of the unit.
Electromagnetic interference 5 kV repeated pulses, per UL-991 and ANSI C37.90A.
Radio frequency interference Up to 95 MHz and 61.3 V/M field strength

CCoonnttrrooll PPoowweerr SSppeecciiffiiccaattiioonnss
Unit powered by 12.00 VAC (+10%, -15%) supply
Power requirements 4VA
Control circuit inputs 120 VAC or 125 VDC (+10%, -15%)
Control circuit outputs 120 VAC (+10%, -15%)
Maximum output loading allowed

for continuous operation
Frequency 50 Hz: +4%, -5%

1.0A for each output energized
Maximum leakage current allowed: 5mA

60 Hz: ± 5%

46

Appendix A Technical Specifications

Catalog Number

SAMMS-MV Model Number

SAM6 - SAMMS-MVE
SAM7 - SAMMS-MVX

Configuration

Control Type

L - Local and/or Remote Control

Alarm Contacts Configuration

(SAMMS-MVX Only)

0 - None
1 - Normally Closed Contacts (N.C.)
2 - Normally Open Contacts (N.O.)

SAM6

L1ALG0000

Alarm Contacts Output (SAMMS-MVX Only)

A - Any of the Below
B - Impending Trip
C - Overload Trip
D - External Trip
E - Ground Fault
F - None

Loss of Voltage (SAMMS-MVX Only)

L - Loss of Voltage Ridethrough
0 - None

G - Ground Fault Protection
0 - None

Control Circuit Number
Loaded at Factory
0000 - None

Figure A-1Figure A-1

Figure A-1 Catalog Number and Configuration Breakdown for SAMMS-MV

Figure A-1Figure A-1

Ground Fault

Control Circuit Number

47

Appendix A Technical Specifications

SIDE FRONT

1234 56 78910111213141516

SAMMS-MVX

LED Flashing

LED on

LED

Current

> 40%

20 - 40%

Unbalance
Impending

> 100%

> 110%

Trip

< 110%

Overload

Start

Overload

Trip

Inhibit

Incomplete

Trip

Sequence

Trip:Loss

Alarm: Loss

External

of Load, or

of Load or

TripAlarm

Jam, or

6.00"

2.125" 6.25"

.375" 5.50"

Prcs Current

RTDInput
Trip:CPU

CPU

Failure or

Fault

Low Voltage

Ground

Trip

Alarm

Fault

Current
Unbalance

Impending
Trip

Overload
Trip

Incomplete

CPU

Sequence

Fault

External

Ground

Trip/Alarm

Fault

Reset/Test

Ready

5.25"

.375"

4X .125" DIA X .375" DEEP
FOR #6 SELF-TAPPING
MOUNTING SCREWS

REAR

Figure A-2Figure A-2

Figure A-2 Overall Dimensions and Mounting Diagram

Figure A-2Figure A-2

S1

12

OPEN

S2

2345

OPEN

1

SWITCH # FUNCTION POSITION

S1 - 1
S1 - 2
S2 - 1
S2 - 2
S2 - 3
S2 - 4
S2 - 5

1.010"

2.50+.02"

.266"

3.258"

NORMALLY OPEN
NORMALLY CLOSED
ANY OF THE BELOW
IMPENDING TRIP
OVERLOAD TRIP
EXTERNAL TRIP
GROUND FAULT

Figure A-3 Figure A-3

Figure A-3 Alarm Contact Configuration Switches (SAMMS-MVX Only)

Figure A-3 Figure A-3

48

Appendix A Technical Specifications

4.25

0.375

0.50

3.50

.188 DIA (2X)
FOR MOUNTING

1.00

RATING LABEL LOCATION

#10 STUD WITH NUTS, WASHER,
& LOCKWASHER (TYPICAL)

2.94

36" TINNED COPPER
#20 GA LEADS

TYPE
5A ACT

Figure A-4 SAMMS 5A Auxiliary Current Transformer

INPUT
5A

CATALOG NUMBER
SAMMS 5A ACT

49

Siemens Energy &
Automation, Inc.

Switchgear and Motor Control
Division
P.O. Box 29503
Raleigh, NC 27626-0503

Bulletin MVC-9108 (New) 2M 0394FP Printed in U.S.A.

© 1994 Siemens Energy & Automation, Inc.

Siemens is a registered trademark of Siemens AG