Siemens MCC-3298 User Manual

SAMMS-LV

™

Siemens Advanced Motor Master System for
Low Voltage Motors

User's Manual

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Manual No. MCC-3298

The use of unauthorized parts in the repair of the equipment or tampering by
unqualified personnel will result in dangerous conditions which will cause severe
personal injury or equipment damage. Follow all safety instructions contained
herein.

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.

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.

IMPORTANT

QUALIFIED PERSON

SUMMARY

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.

Contents

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

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

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

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

1.2.2 Advanced Protection for Low-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-LV Device ...........7

2.1 Receiving and Storing the SAMMS-LV 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-LV Device...........................9

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

3 Operating the SAMMS-LV 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-LVX Only) ............................17

3.9 Ridethrough Upon Loss of Power

(SAMMS-LVX Only) .........................................17

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

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

3.12 Protection Curves and Overload

Classes ..........................................................17

3.13 Ultimate Trip Level and Service Factor ............22

3.14 Phase Unbalance ........................................... 22

3.15 Dual Overload Protection (SAMMS-LVX Only) .22

3.16 Jam Protection (SAMMS-LVX Only).................22

3.17 Loss of Load Protection/War ning

(SAMMS-LVX Only) .........................................22

3.18 Process Current Warning (SAMMS-LVX Only) .22

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

3.20 Repetitive Starts .............................................23

3.21 Start Inhibit .....................................................23

3.22 Cooling T ime Constants .................................23

3.23 Normalized Temperature Rise for Class B and

Class F Insulation ...........................................23

3.24 Ground Fault Detection .................................. 23

3.25 Autoreset After a Trip (SAMMS-LVX Only)........24

3.26 Emergency Restarting .................................... 24

3.27 Using the Hand Held Communicator (HHC) ...24

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

3.27.2The LIST Key ....................................... 26

3.27.3 UP and DOWN Keys ............................26

3.27.4 Using the ENTER Key ..........................26

3.28 Using the SAMMS-LV Device

Functions ....................................................... 29

3.28.1Program Mode/Passwords................... 29

3.28.2 SAMMS-LV Functions..........................31

4 Troubleshooting the SAMMS-LV

Device.....................................................39

Appendix A - Technical Specifications of the

SAMMS-LV Device ................................4 2

©Copyright 1994 Siemens Energy & Automation, Inc.
SIEMENS is a registered trademark of Siemens AG. ACCESS, SAMMS, SAMMS-LV, 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-LV electronic motor control and protection

device 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-LV 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-LV) motor protection and control relay

which incorporates protection designed for low voltage motors.

This manual also contains information for installing and operat-

ing the device, communicating with other devices over the

ACCESS electrical distribution communications 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-LV 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-LV Device

The SAMMS-LV 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 low voltage motors. The SAMMS-LV system

includes a microprocessor-based SAMMS-LV 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-LV device

is a multi-functional device offering the following:

 advanced motor protection for low 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-LV device does not replace the disconnect

device or the contactor itself.

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

learn about the SAMMS-LV device Section 1, Introduction

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

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

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

connect the SAMMS-LV device to the ACCESS

Section 2, Installing the SAMMS-LV Device

System

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

learn about the technical specifications of the

Appendix A, Technical Specifications of the SAMMS-LV Device

SAMMS-LV device

Table 1.1 Where to find information

3

1 Introduction

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Figure 1.1 SAMMS-LV, front view

1.2.1 The SAMMS-LV Device Models

The SAMMS-LV device is available in two models: SAMMS-LVE

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

industrial and commercial specifications and installations. Table

1.2 compares the features of each model.

The SAMMS-LV 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-LVX 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-LVX device accepts up to four remote inputs, while

SAMMS-LVE accepts two remote inputs.

SAMMS-LVE is a model of SAMMS-LV tailored to across-the-

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

tions of the SAMMS-LVX 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-LVE accepts

two remote inputs, and provides one output to actuate a single

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

The SAMMS remote inputs are compatible with all PLCs and

electromechanical remote control devices that have a 120VAC

or 125VDC output signal.

1.2.2 Advanced Protection for

Low-Voltage Motors

For advanced protection of low voltage motors, the SAMMS-LV

device uses a motor model algorithm that continually calculates

the stator winding and housing temperature as a function of the

motor rms current. The motor model compares the calculated

temperature 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 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-LV

devices memory.

1.2.5 Using the Standardized Control Panel

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

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

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

includes six pushbuttons with lights and tactile feedback. These

light bars and pushbuttons are programmed 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-LV 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 reaches

a critically high value.

1.2.4 Programming Control Circuits

The SAMMS-LV device allows you to modify its configuration by

programming the microprocessor. The SAMMS-LV device

replaces conventional timers, overload relays, pushbuttons,

and selector switches.

SAMMS-LVE 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-LV device communicates with other devices via

the ACCESS system. When connected to the ACCESS system,

the SAMMS-LV 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-LV 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 ACCESS

System (manual no. SG-6028).

A library of more than 70 typical control circuits exists for use

with SAMMS-LVX to meet applications ranging from simple

5

1 Introduction

SAMMS-LV Model SAMMS-LVE SAMMS-LVX

Application

Across-the-line, non reversing

Across-the-line, reversing

Two-speed, one winding, constant or

variable torque

Two-speed, one winding, constant

horsepower

Two-speed, two winding

Reduced voltage, autotransformer

Reduced voltage, Y-D, open transition

Reduced voltage, Y-D, closed transition

Part winding

Wye-delta

Full voltage, part winding

Functions available (see table 3.7)

Ridethrough upon loss of power

Ground fault protection/alarm

X X

F0-F21 plus F25-F27 (except no

F3, F5, or F8)

No Yes

Yes Yes

X

X

X

X

X

X

X

X

X

X

F0-F27

Programmable alarm contact

Control circuits

Change settings requires password

Remote inputs

Outputs

Light bars

Table 1.2 SAMMS-LV models

No Yes

Seven (preloaded), selectable with

HHC. May download any custom

across-the-line control circuit

Yes Yes

Two Four

One Three

Two Three

Any downloadable control circuit

6

2 Installing the SAMMS-LV Device

2 Installing the SAMMS-LV Device

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

2.1 Receiving and Storing the
SAMMS-LV 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-LV 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-LV device and its associated
devices in most industrial equipment environments. Unless the
device is designed for specific requirements, you should install
the SAMMS-LV 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.

and a wiring diagram. The connection diagram illustrates the
connections between the SAMMS-LV device and its peripheral
devices. The ladder diagram illustrates the control circuit
loaded into the SAMMS-LV device. Figure 2-1 shows a typical
connection diagram for the SAMMS-LV 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-LV 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-LV 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.

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

2.3 Mounting the Device

The SAMMS-LV device mounts in a front door of Siemens
motor control center (MCC), or on the front door of any motor
controller.

2.4 Connecting the Device

This section contains general guidelines that you should follow
to connect the SAMMS-LV device. These guidelines include
instructions for routing the wiring, connecting the wires and
grounding the device. Use these guidelines to install the
SAMMS-LV 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-LV device as part of a motor
controller, Siemens personnel install the wiring between the
SAMMS-LV 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

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-LV 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-LV Device

Figure 2.1 Full voltage non-reversing connection diagram

8

2 Installing the SAMMS-LV 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-LV 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-LV Device

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

2.4.5 Communications Connection

The SAMMS-LV 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-LVX

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
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-LV Device

enables the SAMMS-LV to communicate with a remote super­visory device. Examples of the remote supervisory device
include the Power Monitor display 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-LV device
and allow it to operate in the ACCESS electrical distribution

1 = ­2 = GND
3 = +
4 = 12VDC+

Top View

5 = 12VDC-

communications system.
The SAMMS-LV 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-LV device to
the ACCESS network.

Proper make-up of 5 pin plug

Rear View

54321

Side View

5 pin plug

12345

Ribbon cable assembly

12Vdc(-)
12Vdc(+)

BLK

Comm Cable Comm Cable

SAMMS
Communications
Module
CM-1

WHT

Shield

Figure 2.3 SAMMS-LV device communications connections

10

Rear view of the SAMMS-LV device

3 Operating the SAMMS-LV Device

3 Operating the SAMMS-LV Device

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

Operation of the device requires that the unit have control power

(12VAC) applied to terminals 5-6. Most operations also require

use of the Hand-Held Communicator (HHC). Use of the HHC is

described in detail in section 3.27.

3.1 Password Protection

Changing the settings of the SAMMS-LV 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-LV device is shipped from the factory

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

the user as described in section 3.28.1. 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-LV device as illustrated in Figure

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

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 3.28. 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-LV device

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

relay test.

Note that this test checks the electronic circuitry, but does not

replace a test in which actual power current is passed through

the primary circuit.

Use the following procedure to reset the SAMMS-LV 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.

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8

7

6

4

5

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Figure 3.1 Front view of SAMMS-LV

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-LV 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-LV device

stores in its memory the executable code representing the

ladder diagram for the users control application. The SAMMS-LV

device and ladder diagram code replace the conventional

control logic defined by wired interconnection of electrome-

chanical timers, control relays, pushbuttons, selector switches,

and pilot lights. A library of over 70 standard ladder diagrams

available for the SAMMS-LV 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-LV device.

The circular symbols represent output devices such as contactor

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

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-LV 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

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-LV output devices:

AC Outputs

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

capable of driving contactors up to size 6, while SAMMS-LVE

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-LV 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-LV 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-LV software. Through the

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

tacts.

TR4 Fixed on-delay 30

Table 3.1 Types of software timing relays

Pilot LEDs

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

panel, while the SAMMS-LVE 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-LV

device.

Remote AC Inputs

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

remote control, or you can use two inputs for SAMMS-LVE.

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.

The communications inputs must be included in the ladder logic

(control circuit).

3 Operating the SAMMS-LV Device

3.6 Ladder Diagrams

3.6.1 Library of Standard Ladder Diagrams

The SAMMS-LV library of more than 70 ladder diagrams covers

most standard motor control applications. Table 3.3 lists the

standard control circuits and the input and output assignments

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 (size 2 through 4)

 reduced-voltage, autotransformer (sizes 5 and 6)

 full-voltage, part winding

 wye-delta, open transition

 wye-delta, closed transition

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-LVE has seven preloaded circuits (ladder diagrams)

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

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-LV 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-LV 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-LV device (sheet 1)

13

3 Operating the SAMMS-LV Device

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

12345678 9 10 11 12

STOP or OFF

SAMMS-LVX

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
Jam

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