Kohler M340+ Service And Parts Manual

Service and Parts

Automatic Transfer Switches

Models:

M340+

Logic:

Microprocessor

U.S.A. Plant ISO Registered

TP-5672 11/95d

Table of Contents

SUBJECT PAGE SUBJECT PAGE

Safety Precautions and Instructions I. . . . . . . . . . .

Introduction i. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

List of Related Manuals i. . . . . . . . . . . . . . . . . . . . . . . .

Service Assistance i. . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 1. Specifications 1-1. . . . . . . . . . . . . . . . . . .

Purpose of Switch 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Components of Switch 1-1. . . . . . . . . . . . . . . . . . . . . . .

Ratings 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Interpreting a Transfer Switch Part Number 1-3. . . . .

Specifications 1-4.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Standard Features 1-4. . . . . . . . . . . . . . . . . . . . . . .

Shunt-Jumper-Controlled Accessories 1-5. . . . . .

Optional Features 1-5. . . . . . . . . . . . . . . . . . . . . . . .

Section 2. Operation 2-1. . . . . . . . . . . . . . . . . . . . . . .

LED Indicators 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Control Switches and Indicators 2-2. . . . . . . . . . . . . . .

Sequence of Operation 2-3. . . . . . . . . . . . . . . . . . . . . . .

Normal Source Failure 2-3. . . . . . . . . . . . . . . . . . . .

Normal Source Restoration 2-4. . . . . . . . . . . . . . .

Sequence of Operation Programmed Transition 2-6.

Normal Source Failure 2-6. . . . . . . . . . . . . . . . . . . .

Normal Source Restoration 2-7. . . . . . . . . . . . . . .

To Disconnect The P1 Plug 2-9. . . . . . . . . . . . . . . . . . .

Electrical Operation Test 2-9. . . . . . . . . . . . . . . . . . . . .

Section 3. Troubleshooting Guide 3-1. . . . . . . . . .

Section 4. Controller Troubleshooting 4-1. . . . . .

Power to the System 4-2. . . . . . . . . . . . . . . . . . . . . . . . .

Keypad And Status Panel 4-3. . . . . . . . . . . . . . . . . . . .

Normal Source Voltage and Frequency 4-6.. . . . . . . .

Emergency Source Voltage and Frequency 4-9.. . . .

System-Status, Not-In-Automatic Error 4-11.. . . . . . .

System-Status, System-Alert 4-12. . . . . . . . . . . . . . . .

Contactor Position Fault Error Messages 4-12. . . . . .

Transfer Hang Error Message 4-12. . . . . . . . . . . . . . . .

Power-Down Error Message 4-12. . . . . . . . . . . . . . . . .

RAM Or Memory Error Message 4-13. . . . . . . . . . . . .

Manual Transfer Message 4-13. . . . . . . . . . . . . . . . . . .

Manual-to-Off Transfer Message 4-13.. . . . . . . . . . . .

Fault #1 Or Fault #2 Message 4-14.. . . . . . . . . . . . . . .

Programming Mode Not-In-Off 4-15. . . . . . . . . . . . . . .

Engine Operates When it Should Not 4-16. . . . . . . . .

Engine Will Not Start 4-18.. . . . . . . . . . . . . . . . . . . . . . .

Area Protection 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shunt Jumper-Controlled Options 4-21. . . . . . . . . . . . .

Inphase Monitor 4-23. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Source Monitors 4-24. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Plant Exerciser 4-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Delays 4-32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Override 4-33. . . . . . . . . . . . . . . . . . . . . . . . . . .

Off Delays 4-34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Section 5. Accessory Troubleshooting 5-1. . . . . .

Optional Accessories 5-2. . . . . . . . . . . . . . . . . . . . . . . .

Emergency Source Three-Phase Phase Option 5-2.

Test Switches 5-4.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Delay Override Option 5-10. . . . . . . . . . . . . . . . .

Preferred Source Switch 5-14.. . . . . . . . . . . . . . . . . . .

Relay Auxiliary Dry Contacts 5-15. . . . . . . . . . . . . . . . .

Main Shaft Auxiliary Dry Contacts 5-22. . . . . . . . . . . .

Meters 5-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Charger 5-47. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Manual Operation Switches 5-54. . . . . . . . . . . . . . . . . .

Load Shedding Contacts 5-63. . . . . . . . . . . . . . . . . . . .

Remote Communication—RS/232 Or RS/485 5-65. .

Section 6. Service Parts 6-1. . . . . . . . . . . . . . . . . . . .

Introduction 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Inner Panel 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessories 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Delay 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Source monitors 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Test Switches 6-5.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Time Delay Override Switches 6-5.. . . . . . . . . . . . . . .

Preferred-Source Switches 6-5. . . . . . . . . . . . . . . . . . .

Auxiliary Contacts—Relay 6-5. . . . . . . . . . . . . . . . . . . .

Auxiliary Contacts—Main Shaft 6-5. . . . . . . . . . . . . . . .

Meters 6-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Plant Exercisers 6-11. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Battery Chargers 6-11. . . . . . . . . . . . . . . . . . . . . . . . . . .

Source Monitors—Normal and Emergency 6-12. . . .

Load-Shed Contacts 6-12.. . . . . . . . . . . . . . . . . . . . . . .

Time Delays 6-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Appendix A. Glossary of Abbreviations A-1.. . . .

Appendix B. General Controller Information B-1.
Appendix C. Commonly Used Accessories C-1. .

Safety Precautions and Instructions

A transfer switch, like any other electromechanical
device, can pose potential dangers to life and limb if
improperly maintained or imprudently operated. The
best way to prevent accidents is to be aware of the
potential dangers and to always use good common
sense. Below are some general precautions relating to
theoperation ofa transfer switch. This manual contains
several types of safety precautions which are explained
below. SAVE THESE INSTRUCTIONS.

DANGER

Danger indicates the presence of a hazard that will
cause severe personal injury, death, or substantial
property damage if the danger is ignored.

WARNING

Warning indicates the presence of a hazard that can
cause severe personal injury, death, or substantial
property damage if the warning is ignored.

NOTE

Note communicates installation, operation, or
maintenance information that is important but not
hazard related.

Safety decals are affixed to the generator set in
prominent places to advise the operator or service
technician of potential hazards. The decals are
reproduced here to improve operator recognition. For a
further explanation of decal information, refer to the
safety precautions throughout this manual. Before
operating or servicing the generator set, be sure you
understand the messages of these decals. Replace
decals if missing or damaged.

Safety decals are affixed to the transfer switch in
prominent places to advise the operator or service
technician of potential hazards. The decals are
reproduced here to improve operator recognition. For a
further explanation of decal information, refer to the
safety precautions throughout this manual. Before
operating or servicing the transfer switch, be sure you
understand the messages of these decals. Replace
decals if missing or damaged.

CAUTION

Caution indicates the presence of a hazard that will or
can cause minor personal injury or property damage if

the caution is ignored.

TP-5672 11/95

Safety Precautions and Instructions I

Accidental Starting

WARNING

Accidental starting.
Can cause severe injury or death.

Disconnect battery cables before working on
generator set (negative lead first and reconnect it
last).

Accidental starting can cause severe injury or
death. Turn generator set master switch to OFF

position, disconnect power to battery charger, and
remove battery cables (remove negative lead first and
reconnectitlast)to disable generator setbeforeworking
on any equipment connected to generator set. The
generator set can be started by automatic transfer
switch or remote start/stop switch unless these
precautions are followed.

II Safety Precautions and Instructions TP-5672 11/95

Battery

WARNING

Sulfuric acid in batteries.
Can cause severe injury or death.

Use protective goggles and clothes. Battery acid can
cause permanent damage to eyes, burn skin, and eat
holes in clothing.

WARNING

Explosion.
Can cause severe injury or death. Relays in
battery charger cause arcs or sparks.

Locate in a well-ventilated area. Keep explosive
fumes away.

Sulfuric acid in batteries can cause severe injury or
death. Sulfuric acid in battery can cause permanent

damage to eyes, burn skin, and eat holes in clothing.
Alwayswear splash-proofsafety goggleswhen working
around the battery. If battery electrolyte is splashed in
the eyes or on skin, immediately flush the affected area
for15 minutes withlargequantities of cleanwater. Seek
immediatemedicalaidin the caseofeyecontact. Never
addacidtoa battery once thebatteryhasbeen placed in
service. This may result in hazardous spattering of
electrolyte.

Sulfuric acid in batteries can cause severe injury or
death. Sulfuric acid in battery can cause permanent

damage to eyes, burn skin, and eat holes in clothing.
Alwayswear splash-proofsafety goggleswhen working
around the battery. If battery electrolyte is splashed in
the eyes or on skin, immediately flush the affected area
with large quantities of clean water. Continue flushing
with water until emergency help arrives Seek
immediatemedicalaidin the caseofeyecontact. Never
addacidtoa battery once thebatteryhasbeen placed in
service. This may result in hazardous spattering of
electrolyte.

Explosioncancause severe injury or death. Battery
gases can cause an explosion. Do not smoke or permit
flame or spark to occur near a battery at any time,
particularly when it is being charged. Avoid contacting
terminals with tools, etc., to prevent burns and sparks
that could cause an explosion. Remove wristwatch,
rings, and any other jewelry before handling battery.
Never connect negative (--) battery cable to positive (+)
connection terminal of starter solenoid. Do not test
batterycondition by shortingterminals together. Sparks
could ignite battery gases or fuel vapors. Ventilate any
compartment containing batteries to prevent
accumulation of explosive gases. To avoid sparks, do
not disturb battery charger connections while battery is
being changed. Always turn battery charger off before
disconnecting battery connections. Remove negative
lead first and reconnect it last when disconnecting
battery.

TP-5672 11/95

Safety Precautions and Instructions III

Hazardous Voltage/
Electrical Shock

DANGER

Hazardous voltage.
Will cause severe injury or death.

Do not open enclosure until all power sources are
disconnected.

(600 Volt and above)

DANGER

Hazardous voltage.
Will cause severe injury or death.

Disconnect power sources before servicing.
Barrier must be installed after adjustments,
maintenance, or servicing.

(600 Volt and above)

WARNING

WARNING

Hazardous voltage.
Can cause severe injury or death.

Do not open enclosure until all power sources are
disconnected.

(under 600 Volt)

Hazardous voltage can cause severe injury or
death. Whenever electricity is present, there is the

hazardofelectrocution. Openmaincircuitbreaker on all
power sources before servicing equipment. Electrically
ground the generator set and electrical circuits when in
use. Never come into contact with electrical leads or
appliances when standing in water oron wet ground, as
the chance of electrocution is increased under such
conditions.

Hazardous voltage can cause severe injury or
death. Short circuits can cause bodily injury and/or

equipment damage. Do not contact electrical
connections with tools or jewelry while adjustments are
made. Remove wristwatch, rings, and jewelry that can
cause short circuits.

Hazardous voltage can cause severe injury or
death. To prevent the possibility of electrical shock,

disconnect harness plug before installing any
accessories involving connection to transformer
assembly primary terminals 76, 77, 78, and 79.
Terminals are at line voltage!

(S340, R340, and R33 models only.)

Hazardous voltage can cause severe injury or

Hazardous voltage.
Can cause severe injury or death.

Disconnect power sources before servicing.
Barrier must be installed after adjustments,
maintenance, or servicing.

(under 600 Volt)

IV Safety Precautions and Instructions TP-5672 11/95

death. To prevent the possibility of electrical shock,
disconnect harness plug before installing any
accessories involving connection to transformer
assembly primary terminals on microprocessor logic
models. Terminals are at line voltage!

Hazardous voltage can cause severe injury or
death. To prevent the possibility of electrical shock,

de-energize the normal power source to be connected
to the transfer switch before makingany line or auxiliary
connections.

Hazardous voltage can cause severe injury or
death. De-energize bothnormal and emergencypower

sourcesbefore proceeding. Movegenerator set master
switch on controller to OFF position and disconnect
battery negative (--) before working on transfer switch!
Turn the transfer switch selector switch to the OFF
position.

Hazardous voltage can cause severe injury or
death. Disconnect inner panel harness at in-line

connector. This will de-energize circuit board and logic
circuitry, but allow transfer switch to continue to supply
utility power to necessary lighting and equipment.
Hazardousvoltage will exist ifanyaccessories mounted
to inner panel are NOT wired through the inner panel
harness and de-energized by in-line connector
separation. Such accessories are at line voltage.

TP-5672 11/95

Safety Precautions and Instructions V

Heavy Equipment

WARNING

Unbalanced weight.
Improper lift can cause severe injury or death
and/or equipment damage.

Use adequate lifting capacity.
Never leave transfer switch standing upright
unless it is securely bolted in place or stabilized.

VI Safety Precautions and Instructions TP-5672 11/95

Notes

NOTE

Hardware Damage! Transfer switch may use both

American standard and metric hardware. Use the
correct size tools to prevent rounding of bolt heads and
nuts.

NOTE

When replacing hardware, do not substitute with
inferior grade hardware. Screws and nuts are

available in different hardness ratings. American
Standard hardware uses a series of markings and
metric hardware uses a numeric system to indicate
hardness. Check markings on bolt head and nuts for
identification.

NOTE

A manual operator handle is provided on the transfer
switch for maintenance purposes only. Return the
transfer switch to the normal position. Remove manual
operator handle (if used) and store it on the transfer
switch in the placeprovided when service is completed.

NOTE

Perform voltage checks in the order given to avoid
damaging the switch.

NOTE

These battery chargers are designed strictly for use in
thistransfer switch andconform with ULand CSAlisting
requirements where specified. Do not use battery
charger before reading instructions.

NOTE

Connect source and load phases as indicated by the
markings and drawings. Improper connections may
causeshortcircuitsand can causephase-sensitiveload
devices to run in reverse or prevent load devices from
functioning.

NOTE

Charger Damage! Connect battery charger only to a

batterywith thesame DC voltage as the battery charger
output rating.

NOTE

Covertransferswitchduring installation to keepdirt,grit,
metal drill chips, etc., out of components. Cover
solenoid mechanism during installation. After
installation, use manual operating handle to position
contactor to ensure that it operates freely. Do not use a
screwdriver to force contactor mechanism.

TP-5672 11/95

Safety Precautions and Instructions VII

Introduction

This manual covers the operation, troubleshooting,
repair,and service parts for the M340+ microprocessor
logic controller.

Read through this manual and carefully follow all
procedures and safety precautions to ensure proper
transferswitchoperationandtoavoidbodilyinjury.Keep
this manual with the transfer switchfor futurereference.

Service requirements are minimal but are very
important to the safe and reliable operation of the
transfer switch; therefore, inspect associated parts
often. It is recommended that an authorized service
distributor perform required servicing to keep the switch
in top condition.

All information found in this publication isbased on data
availableat timeof printing. The manufacturerreserves
the right to make changes to this literature and the
products represented at any time without notice and
without incurring obligation.

List of Related Manuals

The logic controller covered in this manual is part of a
family of related devices. Separate service and parts
manuals are available for each group within the overall
family. Be sure this manual is the correct manual for the
automatic transfer switch.

A power conversion unit is included in each automatic
transfer switch. There are three types of power
conversion units and each type is covered in a separate
service and parts manual. Available power conversion
units and the related manual numbers are as follows:

Service/

Power Switch Device

Mechanically held or
electrically held contactors

Molded-case circuit breakers
or switch

Standard contactor,
programmed transition, and
Bypass-Isolation

Parts Manual

TP-5667

TP-5666

TP-5668

Service Assistance

For sales and service in the U.S.A. and Canada check
the yellow pages of the telephone directory under the
headingGENERATORS—ELECTRICfor anauthorized
service distributor/dealer or call 1-800-544-2444.

KOHLER CO., Kohler, Wisconsin 53044 U.S.A.
Phone: [phone]
Fax: [phone] (U.S.A. Sales)

920-459-1614 (International)

To ensure supply of correct parts or information, make
note of the following identification numbers in the
spaces provided:

PART NUMBER AND SERIAL NUMBER

Part and serial numbers are provided on the nameplate
attached to the transfer switch.

Part No.

Serial No.

TP-5672 11/95 Introduction i

Notes

TP-5672 11/95Introduction ii

Section 1. Specifications

Purpose of Switch

An automatic transfer switch (ATS)is a device used for
transferring critical electrical loads from a normal
(preferred) source of electrical power to an emergency
(standby) source. This transfer occurs automatically
when the normal source voltage fails, or is substantially
reduced, and the emergency source’s voltage has
reached an acceptable level.

Upon normal source failure, the automatic transfer
switchcontrollersignalsthe generator set(s)tostartand

Components of Switch

A typical automatic transfer switch includes the actual
power switching device and the logic controller to
perform power monitoring and transfer sequencing
tasks. See Figure 1-1. An interface board is also
included to match the controller inputs/outputs to the
levels required by a specific switching device.

The three functional units that make up the automatic
transfer switch are mounted in an enclosure with a
hinged front door. The controller mounts on the back of
thefront doorso its controls and indicatorsare available
to an operator. A signal cable with in-line connectors to
facilitate component replacement and door removal
connects the controller to the interface board and the
switching devices.

transfer to the emergency source. The automatic
transfer switch controller continuously senses for an
acceptable normal source and will retransfer the load to
the normal source after it has been restored to an
acceptable level. After retransfer of the load, the
generator set start signal is removed and the generator
set(s) is allowed to shut down.

1

2

TP-5672 11/95

3

1. Power Conversion Unit

2. Interface Panel

3. Logic Controller

Figure 1-1. Transfer Switch Components

Specifications 1-1

567111

Normal
(Utility)

Power

Emergency (Generator) Power

Generator

Start
Generator

Power
Switching
Device

To Load

Figure 1-2. Basic Transfer Switch Block Diagram

Ratings

Anameplate is attachedtotheautomatic transfer switch
enclosure. See Figure 1-3. The nameplate label
includes a factory part number coded to provide
characteristic and rating information that affects
installationandoperation. Copy the partnumberinto the
blank spaces provided in the introduction and then use
the charts in Figure 1-4 to interpret the part number.

NOTE

Also copy the part number and serial number from the
nameplate into the spaces provided in the Service
Assistance Section of the Introduction for use when
requesting service or parts.

Interface

Logic

Controller

Automatic Transfer Switch

AUTOMATICTRANSFER SWITCH

PARTNO. ZCS-160341-0800

SERIAL NO.
VOLTS
PHASE
HERTZ

KOHLER CO. KOHLER WISCONSIN 53044

567112

KOHLER

AMPS
WIRES
POLES

295232

Figure 1-3. Transfer Switch Nameplate

1-2 Specifications TP-5672 11/95

Interpreting a Transfer Switch Part Number

Record the transfer switch part number in the boxes below. The transfer switch part number defines
characteristics and ratings as explained in the accompanying chart.

Type of Switch Type of Logic Voltage & Frequency

Number of

Poles

Number of

Wires

Type of

Enclosure Amperage Rating Code

Kohler Part Number Key

This chart explains the Kohler transfer switch part numbering code system. The
sample part number shown is for a standard molded-case switch with M340+ logic
rated at 480 volts, 60 hertz, 3-phase, 3-pole, and 4 wires in a NEMA 1 enclosure with
an amperage rating of 80 amperes.

Classification of Power Switch

M: Switch or Circuit Breaker
T: Electrically & Mechanically Held
Z: Contactor Style

Type of Power Switch

C: Contactor
E: Electrically Held Contactor
L: Mechanically Held Contactor
M: Molded-Case Circuit Breaker
N: Molded-Case Switch (no protection)

Type of Switch

S: Standard
B: Bypass

Type of Logic

5: M340+
6: M340+ with programmed transition

Voltage Code

60:600 Volt, 60 Hz 66: 480 Volt, 60 Hz
62:120 Volt, 60 Hz 68: 208 Volt, 60 Hz
63:220 Volt, 50 Hz 71: 380 Volt, 50/60 Hz
64:240 Volt, 60 Hz

SAMPLE PART NUMBER

MNS-566341-0080

Number of Poles

2: 2 pole, 1 phase (MM_, MN_, TE_, TL_, devices

will be supplied with 3 poles)
3: 3 pole, 3 phase
6: 4 pole, fully rated switched poles

(no overlapping neutral)

Number of Wires

2: 2 wire
3: 3 wire
4: 4 wire

Enclosure

1: NEMA type 1

Amperes

Available sizes vary with the type of switch.

Figure 1-4. Transfer Switch Model Description

TP-5672 11/95

Specifications 1-3

Specifications

The specifications listed below are for the M340+ logic
controller. See the respective power switching device
manual for its specifications.

Standard Features

D Normal source voltage sensing adjustable from

75% to 130% of normal for pickup and from 70% to
135% for dropout; provides monitoring line-to-line
for all phases of 3-phase switches.

D TDNE (Time Delay Normal-to-Emergency)

adjustable 0 to 5 minutes.

D TDES (Time Delay Engine Start) adjustable from

0 to 6 seconds.

D TDEN (Time Delay Emergency-to-Normal)

adjustable 0 to 30 minutes.

D Program Transition (Center off)—time delay

during transfer with neither source connected to
the load. Adjustable 0 to 2 minutes.

D LCD digital voltmeter.
D LCD digital running time meter.

D LCD digital transfer counter.
D LCD digital frequency meter.
D Status panel with keypad data entry.
D Area protection with override.
D TDEC (Time Delay Engine Cooldown) adjustable

from 0 to 30 minutes.

D Generator engine start contacts.
D Indicators for switch position—normal and

emergency.

D Indicators for source available—normal and

emergency.

D Lamp test switch, momentary.
D Underfrequency sensing—one phase emergency

source only.

1-4 Specifications TP-5672 11/95

Shunt-Jumper-Controlled Accessories

Enable or disable shunt-jumper-controlled accessories
by altering socket JP1 on the main logic board. See
Figure 1-5. All shunt-jumper features are disabled from
thefactoryunlessthe function was ordered atthetimeof
purchase. But features can be enabled after factory
delivery by adding jumpers to the JP1 socket.

Main Logic Board

JP1

MANUAL

TIME

PLANT

VOLT/

PHASE

OFF

Figure 1-5. Logic Board Accessory Programming

Shunts

D Manual Override. Enabling manual override

allows automatic transfer to an available source
when the connected source fails. Transfer time
delays will be bypassed. Disabling manual
override causes the logic board to wait for manual
operation. The logic board will not automatically
seek the available source.

D Inphase Monitor. Abnormal inrush currents from

switching between two live power sources can
damage motors and related equipment. The
purpose of the inphase monitor is to minimize
abnormal inrush currents to equipment when the
ATS transfers from one source to a new power
source. The inphase monitor samples a single
phase of one source and compares it to a single
phase of the other source. When the two voltages
are within the desired phase angle and
approaching a zero phase angle difference, the
inphase monitor signals the transfer switch to

OVRIDE
DELAY
EXER
FREQ
SEQUENCER
MONITORIN-PHASE
DELAYS

567215

operate. The transfer may be from utility to
generator,from generator to generator,or utility to
utility.

NOTE

This option is available only on contactor type,
nonprogrammed transition switches. If the
contactor is not of this type, then the controller will
not allow this option to be enabled. Enable this
accessory by installing the INPHASE MONITOR
jumper on the controller’s main logic board.

D Phase Rotation and Anti-Single Phasing. This

function provides source monitoring for both the
normal and emergency sources. The feature
includesphaserotation(A B C only)andanti-single
phase protection. This option must be used in
conjunction with accessory DD-05-K in order to
provide source monitoring on the emergency side.
Enable this accessory by installing the PHASE
SEQUENCER jumper on the controller’s main
logic board.

D Normal and Emergency Source Sensing. This

function provides overvoltage sensing on all
phasesof the normalsource,over/underfrequency
sensing on one phase of the normal source,
overvoltage sensing on one phase of the
emergency source, and overfrequency sensing on
one phase of the emergency source. Enable this
accessory by installing theVOLT/FREQjumper on
the controller’s main logic board.

D Plant Exerciser. This function enables a no-load

plantexerciser.Userhasachoice of 7-day,14-day,
or calendar-based exercise modes. Enable this
accessory by installing the PLANT EXER jumper
on the controller’s main logic board.

D Extended Time Delay. This function extends the

time delay to 99 minutes for TDNE, TDES, TDEN,
TDOE, TDON, and TDEC. Enable this accessory
by installing the TIME DELAY jumper on the
controller’s main logic board.

D Off Position Time Delay. This function enables

the time delay during transfer when neither source
is connected to the load. Enable this accessory by
installing the OFF DELAYS jumper on the
controller’s main logic board.

Optional Accessories

See Appendix C for details of optional accessories. The
nameplate includes a list of the accessories selected.
See Figure 1-3.

TP-5672 11/95

Specifications 1-5

Section 2. Operation

Control Switches and Indicators

Various optional control switches and indicator lamps
may be present on the transfer switch door depending

AUTO

TRANSFER

MANUAL

TRANSFER TO

EMERGENCY

MANUAL

TRANSFER TO

OFF

MANUAL

TRANSFER TO

NORMAL

MANUAL

TRANSFER

TEST SWITCH

NORMAL TEST

BYPASS

EMERGENCY TO

NORMAL TIME DELAY

BYPASS NORMAL

TO EMERGENCY

TIME DELAY

AUTO INHIBIT

Contactor Position Time Delays

Normal On EndEmergency

·

Source Available

Normal Emergency

· ·

System Status

Not In Automatic

· ·

Programming Mode Not in Off

·

Flashing, Local Steady,Remote

· ·

Plant Exerciser Load Shed Inphase Monitor Area Protection

· · · ·

Off

·

·

System Alert

Accessory Active

on the options chosen. See Figure 2-1 for LED, Switch,
and Key locations.

Engine Start

·

·

Normal To Emergency

·

·

Emergency To Normal

·

·

Engine Cooldown

·

·

Off Position

·

·

Figure 2-1. Front Panel

LED Indicators

Contactor Position. LEDs indicate transfer switch

position—NORMAL (green), EMERGENCY (red), or
OFF (yellow).

Source Available. LEDs indicate source with
acceptable voltage and frequency—Normal (green)
and/or Emergency (red).

System Status

Not in Automatic (red). LED flashes to indicate that

Test switch is actuated, or Auto/Manual switch is in the
Manual position.

System Alert (red). LED flashes to indicate possible
problem with contactor or logic operation. System alert
will also flash if any fault signals are received from the
generator set.

Programming Mode Not in Off (yellow). LED flashes
to indicate that programming switch is in the LOCAL
position. A steady, nonflashing light indicates that the
programming switch is in the REMOTE position.

Operation 2-1TP-5672 11/95

Time Delays

Engine Start (If emergency source is a generator set).

ON LED indicates that engine-start time delay is timing.
ENDLED indicates thattheengine has been signaledto
start.

Normal to Emergency. ON LED indicates that the
normal-to-emergency time delay is timing. END LED
indicates that the time delay has completed timing.

Emergency to Normal. ON LED indicates that the
emergency to normal time delay is timing. END LED
indicates that the time delay has completed timing.

transfer from emergency to normal and normal to
emergency when sources are near synchronization.

NOTE

When a programmed transition switch is ordered, the
inphase monitor option is disabled by the
microprocessor.

Area Protection. Area protection LED indicates that
the controller is in the area protection mode. The
generator will be signaled to START and the contactor
will transfer to the emergency positionand remain there
while in area protection.

Engine Cooldown. ON LED indicates that the
generator set engine cooldown timer is timing. END
LED illuminates until the engine has shut down.

Off Position. ON LED indicates that the time delay off
positionistiming. ENDLEDindicatesthatthetimedelay
has completed timing.

Accessory Active

Plant Exerciser. Plant excerciser LED indicates that

the system is in the exerciser mode.
LoadShed. LoadshedLEDindicates that programmed

load shedding is active.
Inphase Monitor (availableon ZCtype powerswitches

only). Inphase monitor LED indicates that the sources
are being monitored for phase relationship to allow
inphase transfer. The inphase monitor will permit

Control Switches

Test Switch (Standard). Move the test switch to the

TEST position to simulate a normal source outage.
Not-in-Automatic system status light will flash.

Bypass N-E Time Delay Pushbutton Switch
(Option). If the bypass normal-to-emergency time

delay pushbutton is pressed when
normal-to-emergency time delay is on, time delay will
end.

Bypass E-N Time Delay Pushbutton Switch
(Option). If the bypass normal-to-emergency time

delay pushbutton is pressed, when
emergency-to-normal time delay is on, time delay will
end.

Manual Transfer to Emergency Switch (Option).

When the transfer switch control is in the manual mode
of operation and manual to emergency is required,
press the manual transfer-to-emergency pushbutton to

Programming Mode Switch

NOTE

Theprogramming modeswitch keysshould bekept ina
safe place to prevent unwanted tampering with the
transfer switch control. Do not leave the programming
switch in the LOCAL position with the transfer switch
unattended.

Remote. Allows both status monitoring and setting of
the transfer switch controls by a connected personal
computer.

Off. Transfer switch status settings and power source
may be monitored from the local LCD display or
connected computers.

Local. Allows both status monitoring and setting of
transfer switch control from the microprocessor’s LCD
display and keypad.

cause the transfer switch to transfer to the emergency
position.

Manual Transfer to Off Switch (Option). When the
transfer switch control is in the manual mode of
operation and manual to off is required, press the
manual transfer-to-emergency pushbutton to cause the
transfer switch to transfer to the off position.

Manual Transfer to Normal Switch (Option). When
the transfer switch control is in the manual mode of
operation and manual to normal is required, press the
manual transfer-to-emergency pushbutton to cause the
transfer switch to transfer to the normal position.

Auto/Inhibit Switch (Option). If the auto/inhibit switch
is in the AUTO position, the transfer switch will operate
normally. If the switch is in the Inhibit position, the
transfer switch will not transfer under any conditions.

2-2 Operation TP-5672 11/95

Sequence of Operation

This section describes the correct operation of a
microprocessor-controlled transfer switch.

Sequence of Operation Standard Switch

When the Normal Source Fails

1. The source-available normal LED turns off.

2. The time-delay-engine-start ON LED illuminates
to indicate the engine-start-time-delay is timing.

3. The time-delay-engine-start END LED illuminates
to indicate the engine has been signaled to start.

4. The source-available emergency LED
illuminates.

5. The time-delay normal-to-emergency ON LED
illuminates to indicate the normal-to-emergency
time delay is timing.

6. The time-delay normal-to-emergency END LED
illuminates to indicate the time delay has
completed timing.

7. The load-shed LED illuminates at the same time
all loads to be shed are disconnected from the
switch (if equipped with load-shed option).

8. The inphase monitor LED illuminates (if equipped
with inphase monitor option on ZC type power
switches only). The controller monitors the two
voltagesto makesure theyare ata desiredphase
angle and approaching zero phase angle
difference.

9. The contactortransfers tothe emergency position
after the load-shed time-before-transfer timer has
completed timing. The contactor-position normal
LED turns off and the contactor-position
emergency LED illuminates. The inphase monitor
LED turns off.

10. After the load-shed time-after-transfer timer has
completed timing, the selected loads for the
emergencysource are nowreturnedto the switch.
The load-shed LED turns off (if equipped with
load-shed option).

Operation 2-3TP-5672 11/95

When the Normal Source Returns

1. The source-available, normal LED illuminates.

completed timing. The contactor-position
emergency LED turns off and the
contactor-position normal LED illuminates.

2. The time-delay emergency-to-normal ON LED
illuminates to indicate the emergency-to-normal
time delay is timing.

3. The time-delay emergency-to-normal END LED
illuminates to indicate the time delay has
completed timing.

4. The load-shed LED illuminates at the same time
all loads to be shed are disconnected from the
switch (if equipped with load-shed option).

5. The inphase monitor LED illuminates (if equipped
with load-shed option).

6. The contactor transfers to the normal position
after the load-shed time-before-transfer timer has

7. After the load-shed time-after-transfer timer has
completed timing, the selected loads for the
normal source are returned to the switch. The
load-shed LED turns off (if equipped with
load-shed options).

8. The time-delay engine-cooldown ON LED
illuminates to indicate the generator set engine
cooldown timer is timing.

9. The time-delay engine-cooldown END LED stays
illuminated until the generator has shut down.

10. The source-available, emergency LED turns off.

2-4 Operation TP-5672 11/95

Microprocessor-Controlled Transfer Logic

Standard Switch

Normal Source Failure

Time Delay Engine Start

Time Delay Normal-to-Emergency

Load Shed (all)—if equipped

Inphase Monitor—if equipped

Contactor Transfer to Emergency Position

Load Return (programmed sequence)—if equipped

Normal Source Return

Time Delay Emergency-to-Normal

Load Shed (all)—if equipped

Inphase Monitor—if equipped

Contactor Transfer to Normal Position

Load Return (programmed sequence)—if equipped

Time Delay Engine Cooldown

Operation 2-5TP-5672 11/95

Sequence of Operation Programmed Transition Switch

When the Normal Source Fails

NOTE

When a programmed transition switch is ordered, the
inphase monitor option is disabled by the
microprocessor.

1. The source-available, normal LED turns off.

2. The time-delay-engine-start ON LED illuminates
to indicate the engine-start-time-delay is timing.

3. The time-delay-engine-start END LED illuminates
to indicate the engine has been signaled to start.

4. The source-available emergency LED illuminates
after the generator is at rated voltage and
frequency.

5. The time-delay normal-to-emergency ON LED
illuminates to indicate the normal-to-emergency
time delay is timing.

6. The time-delay normal-to-emergency END LED
illuminates to indicate the time delay has
completed timing.

7. The load-shed LED illuminates at the same time
all loads to be shed are disconnected from the
switch (if equipped with load-shed option).

8. After the load-shed time-before-transfer timerhas
completed timing, the contactor transfers to the
Off position. The contactor-position normal LED
turns off and the contactor-position Off LED
illuminates.

9. The time-delay-off-position ON LED illuminates to
indicate the Off position time delay is timing.

10. The time-delay-off-position END LED illuminates
to indicate the time delay has completed timing.

11. The contactor transfers to the emergency
position. The contactor-position Off LED turns off
and the contactor-position emergency LED
illuminates.

12. After the load-shed time-after-transfer timer
completes timing, the selected loads for the
emergencysource arereturned to the switch. The
load-shed LED turns off (if equipped with
load-shed option).

2-6 Operation TP-5672 11/95

When the Normal Source Returns

1. The source-available, normal LED illuminates.

2. The time-delay emergency-to-normal ON LED
illuminates to indicate the emergency-to-normal
time delay is timing.

3. The time-delay emergency-to-normal END LED
illuminates to indicate the time delay has
completed timing.

4. The load-shed LED illuminates at the same time
all loads to be shed are disconnected from the
switch (if equipped with load-shed option).

5. After the load-shed time-before-transfer timerhas
completed timing, the contactor transfers to the
Off position. The contactor-position emergency
LED turns off and the contactor-position Off LED
illuminates.

6. The time-delay off-position ON LED illuminates to
indicate the off-position-time-delay is timing.

7. The time-delay off-position END LED illuminates
to indicate the time delay has completed timing.

8. The contactor transfers to the normal position.
The contactor-position OFF LED turns off and the
contactor-position normal LED illuminates.

9. After the load-shed time-after-transfer timer has
completed timing, the selected loads for the
normal source are returned to the switch. The
load-shed LED turns off (if equipped with
load-shed option).

10. The time-delay-engine-cooldown ON LED
illuminates to indicate the generator set engine
cooldown timer is timing.

11. The time-delay-engine-cooldown END LED stays
illuminated until the generator has shut down.

12. The source-available emergency LED turns off.

Operation 2-7TP-5672 11/95

Microprocessor-Controlled Transfer Logic

Programmed Transition Switch

Normal Source Failure

Time Delay Engine Start

Time Delay Normal-to-Emergency

Load Shed (all)—if equipped

Contactor Transfer to Off Position

Time Delay Off-to-Emergency

Contactor Transfer to Emergency Position

Load Return (programmed sequence)—if equipped

Normal Source Return

Time Delay Emergency-to-Normal

Load Shed (all)—if equipped

Contactor Transfer to Off Position

Time Delay Off-to-Normal

Contactor Transfer to Normal Position

Load Return (programmed sequence)—if equipped

Time-Delay-Engine-Cooldown

2-8 Operation TP-5672 11/95

To Disconnect The P1 Plug

1. If the transfer switch isin the normal position, open
the emergency-source circuit breaker.

it is available, after a time delay. For immediate
retransfer, open and then reclose the
emergency-source circuit breaker. Place the
generator set start switch in the AUTO position.

2. If the transfer switch is in the emergency position,
open the normal-source circuit breaker.

3. Separate the in-line disconnect plug by grasping
and squeezing the plug. Do NOT pull on the wires.

560423

Electrical Operation Test

Place the transfer switch in the NORMAL position. Use
thefollowing procedureto check theelectrical operation
of the automatic transfer switch:

1. Press andhold the testpushbutton for 15seconds.
See Figure 2-1.

2. The generator set should start and run after the
time delay engine start (TDES) completed timing.

3. The transfer switch will transfer to the emergency
position. The transfer occurs after the
normal-to-emergency time delay (TDNE) has
completed timing.

4. Release the test pushbutton. The transfer switch
retransfers to normal after the
emergency-to-normal time delay.

5. Time delay engine cooldown (TDEC) allows the
engineto continue running foranunloaded running
time. The transfer switch TDEC will complete
timing before any TDEC function in the generator
set controller begins timing.

6. Close load circuit breaker(s) when loads may be
safely energized.

Figure 2-2. In-Line Disconnect Plug

To Reconnect The P1 Plug

1 Engage the in-line disconnect plugby grasping the

connectors and pressing them together. See
Figure 2-2.

2 If thetransfer switch isin the normalposition, place

thegenerator set startswitchin the AUTOposition.
Then close the emergency-source circuit breaker.

3. If the transfer switch is in the emergency position,
close the normal-source circuit breaker. The load
willautomatically retransferto the normalsource, if

NOTE

Connecting the transfer switch in-line disconnect
plugs(P1)togetherwhen the generator controller’s
master switch is in the AUTO position causes the
generator set to IMMEDIATELY start and run until
the generator set controller’s cooldown timer
completes timing.

This completes functional tests of the transfer switch.
Leave the AUTO/MANUAL switch in the AUTO
TRANSFER position.

Operation 2-9TP-5672 11/95

Section 3. Troubleshooting Guide

For location of pushbuttons, switches, LEDs, and keys
referred to in this section, see Figure 2-1. Refer to
Figure 3-1 as a guide to troubleshooting problems with

Problem Refer to Section 4—Controller Troubleshooting

None of the LEDs are on and the LCD is blank Power to the system
Pressing a key on the keypad does not supply the appropriate

response
Every LED does not turn on and every character block on the LCD

does not blacken
The normal source should be available but the Source-Available,

Normal LED is not on
The emergency source should be available but the

Source-Available, Emergency LED is not on
The Automatic/Test pushbutton is pressed, the Automatic/Inhibit

switch (option DD-09) is set to Inhibit, or the Automatic-Transfer key
switch (option DD-29) is set to manual, but the System-Status,
Not-In-Automatic LED is not flashing

The System-Status, System-Alert LED is flashing; check the LCD
for a message

The LCD displays Auxiliary-Switch Fault or Double Auxiliary--Switch
fault message

The LCD displays Transfer Hang error message Transfer hang error message
The LCD displays Power-Down error message Power-down error message
The LCD displays RAM or Memory error message RAM or memory error message
The Programming-Mode-Not-In-Off LED is flashing Programming-mode-not-in-off
The engine operates when it should not be operating Engine operates when it should not
The engine should start Engine will not start
One of the control options is not working (the control options

include the inphase monitor, source-phase-sequence,
normal/emergency voltage/frequency sensing, plant exerciser,
extended time delay,and manual override)

the microprocessor logic controller. Refer to Figure 3-2
as guide to troubleshooting problems with the
microprocessor accessories.

Keypad and status panel

Keypad and status panel

Source-available, normal error

Source-available, emergency error

System-status, not-in-automatic error

System-status, system-Alert error

Auxiliary-switch fault or double auxiliary-switch fault error
message

Shunt-jumpered controlled options

TP-5672 11/95

Figure 3-1. Microprocessor logic controller troubleshooting chart

TroubleshootingGuide

3-1

Problem Refer to Section 5—Accessory Troubleshooting

Controller will not sense three-phase emergency voltage Phase sequencer,accessory DD-05
The generator set does not start when the test switch is in the

Test switch, accessory DD-06 and DD-07

engine start position
The generator set does not start when the test switch is in the test

Test switch, accessory DD-06 and DD-07

position
The normal-to-emergency time delay pushbutton does not work Time delay override, accessory DD-08
The emergency-to-normal time delay pushbutton does not work Time delay override, accessory DD-08
The auxiliary dry contacts relay boards do not operate Relay auxiliary dry contacts, accessory DD-14
The analog meters are not working Meters, accessory DD-18
The battery charger is not working Battery charger, accessory DD-24
The manual transfer to emergency source does not work Manual operation switches, accessory DD-29
The manual transfer to normal source does not work Manual operation switches, accessory DD-29
The manual transfer to off does not work Manual operation switches, accessory DD-29
The auto/manual switch does not work in the manual position Manual operation switches, accessory DD-29
The auto/manual switch does not work in the auto position Manual operation switches, accessory DD-29
The load shed contacts do not work Load-shed contacts, accessory DD-35
Problems with remote communication exist Remote communication—RS/232 or RS/485, accessory

DD-51

Figure 3-2. Accessory troubleshooting chart

3-2 TroubleshootingGuide

TP-5672 11/95

Section 4. Controller Troubleshooting

The following section will assist in solving common
problems with the M340+ controller. Note any optional
accessoriesthatmayhavebeenfurnishedonthisswitch

Is the LCD screen blank
and no LEDs illuminated?

Is there 19 vac between terminals
TB-AC1-NAS and TB-AC1-NCS of
the power supply board?

No

Yes

Replace the power
supply board.

Is a battery connected to terminals
TB-DC1-29 and TB-DC1-34 of the
power supply board?

Yes

Is there rated battery voltage
between terminals TB-DC1-29
and TB-DC1-34 of the power
supply board?

No

Check battery and wiring
from battery to assembly
for open of shorted leads.

Is an optional remote
communications board
installed?

Yes No

Is there 10 vdc between pin P2-13
of plug 2 and terminals TB-DC1-34
of the power supply board?

Is there normal source
voltage between terminals
TB-AC1-NA and TB-AC1-NC
of the power supply board?

Is there 10 vdc between terminals
TB-DC1-30 and TB-DC1-34 of
the power supply board?

No

Replace the
load-shed board.

No

and review their operation in section 5—Accessory
Troubleshooting.

No

Yes

Is there from 12 to 30 vdc

No

Yes

Yes Yes

Yes

between terminals
TB-DC1-23 and TD-DC1-34
of the power supply board?

Replace the
logic board.

Yes

Troubleshooting
complete.

Check the normal source
and contactor-to-power
supply board wiring harness
for open or shorted leads.

Yes

Is there an optional
load-shed board
installed?

No

Disconnect the
load-shed board.

Yes

Recheck the voltage at terminals
TB-DC1-23 and TB-DC1-30 of the
power supply board, and pin P2-13
of plug 2. Are the voltages correct?

No

No

Yes

Disconnect the
communications
board.

Recheck the voltage at terminals TB-DC1-23
and TB-DC1-30 of the power supply board, and
pin P2-13 of plug 2. Are the voltages correct?

No

Replace the logic board.

TP-5672 11/95

No

Recheck the voltage at terminals TB-DC1-23
and TB-DC1-30 of the power supply board, and
pin P2-13 of plug 2. Are the voltages correct?

Yes

Yes

Replace the remote
communication board.

Yes

Replace the power supply board.

Figure 4-1. Troubleshooting—Power to the system

Yes

No

Recheck the voltage at terminals TB-DC1-23
and TB-DC1-30 of the power supply board, and
pin P2-13 of plug 2. Are the voltages correct?

Disconnect the status panel
board.

Disconnect the logic board.

No

Controller Troubleshooting

No

Yes

Replace the
logic board.

4-1

Power to the System

Ifthereisaproblemwiththelogicboard,thefirststepisto
check the status panel. If no LEDs on the status panel
are illuminated and the liquid crystal display (LCD) is
blank, check the power to the system by performingthe
following steps. See Figure 4-1 for the Power to the
System troubleshooting flowchart. See Appendix B
Figure B-4 for location of power supply board
components referred to in this section. See Appendix B
FigureB-6forlocationanddescriptionofP2ribboncable
pins. See Appendix B Figure B-9 for location of main
logic board components referred to in this section.

1. Using a voltmeter, connect one test lead to
TB-AC1-NA. Connect the other test lead to
TB-AC1-NC. If the voltmeter does not read the
expected normal source voltage,check the normal
sourceandthecontactor-to-assemblyharness,P1.

2. If thenormalsourcevoltageispresent,connectone
test leadto TB-AC1-NAS and the other test leadto
TB-AC1-NCS. If the voltmeter does not read
approximately 19 volts AC, the secondary normal
source voltage, check that the transformer is wired
correctly. If the transformer is wired correctly and
the voltmeter still does not read 19 volts AC,
disconnect transformer secondary wires andretest
transformer secondary voltage to determine if the
transformer or the logic board assembly is at fault.

3. If boththenormalsourcevoltageandthesecondary
normal source voltage are present, connect one
test lead to TB-AC1-EA and the other test lead to
TB-AC1-EC. If the voltmeter does not read the
expected emergency source voltage, check the
emergency source and the contactor-to-assembly
harness, P1.

4. If theemergencysourcevoltageispresent,connect
one test lead to TB-AC1-EAS and the other test
leadtoTB-AC1-ECS.If thevoltmeterdoesnot read
approximately19voltsAC,theexpectedsecondary
emergency source voltage, check that the
transformer is wired correctly. If the transformer is
wiredcorrectly andthe voltmeter still doesnot read
19 volts AC, disconnect transformer secondary
wires and retest transformer secondary voltage to
determine if the transformer or the logic board
assembly is at fault.

5. If the emergency source, normal source, and
transformers are all working properly, and the
batteryback-upoptionisused,connectthe positive
testleadtoTB-DC1-29andthe negativetestleadto
TB-DC1-34.If thevoltmeterdoesnot read between
12and30voltsDC,expectedbatteryvoltage,check
the battery-to-assembly wires and the battery.

6. Connect the positive test lead to TB-DC1-23, and
the negative test lead to TB-DC1-34. If the
voltmeter does not read betweenapproximately12
and30voltsDC,checkifanaccessoryisconnected
toTB-DC1-23.Ifthereisanaccessoryconnectedto
TB-DC1-23,disconnectit. If the voltmeter stilldoes
notread between12and30 voltsDC, performstep

9.

NOTE

When taking a voltage or resistance measurement
at a ribbon cable pin, do not disconnect the ribbon
cable from the board. Use a needle point probe to
take the readings from the holes on the top side of
the ribbon cable connector.

7. Connect the positive test lead to P2-13, and the
negative test lead to TB-DC1-34. If the voltmeter
does not read approximately 10 volts DC, perform
step 9. See Appendix B Figure 6 for location of P2
ribbon cable pins.

8. Connect the positive test lead to TB-DC1-30 and
the negative test lead to TB-DC1-34. If the
voltmeterdoesnotreadapproximately10voltsDC,
perform step 9.

9. If eachofthemeasurementstakeninsteps6,7,and
8 was correct, this step may be skipped.

a. Disconnect the main logic board ribbon cable

from P2, and recheck the voltages in steps 6, 7,
and8. If thevoltagereadings in steps 6,7, and8
are now correct, the main logic board is
defective. Replace the logic board assembly.

b. If the logic board is equipped with a load shed

board, disconnect the load shed ribbon cable
from P10 on the main logic board, and recheck
the voltages in steps 6, 7, and 8. If the voltage
readings in steps 6, 7, and 8 are now correct,
replace the Load Shed board.

c. If the logic board is equipped with a remote

communications board, disconnect the remote
communications ribbon cable from P12 on the
main logic board, and recheck the voltages in
steps6, 7, and 8. If thevoltagereadings in steps
6, 7, and 8 are now correct, replace the remote
communications board.

d. Disconnect the status panel ribbon cable from

P4,andrecheckthevoltagesinsteps6,7, and8.
If the voltage readings in steps 6, 7, and 8 are
now correct, the status panel is defective.
Replace the logic board assembly.

e. If the voltages measured in steps 6, 7, and 8

were never correct, replace the power supply
board.

4-2 Controller Troubleshooting

TP-5672 11/95

Keypad And Status Panel

For location of pushbuttons, switches, LEDs, and keys
referred to in this section, see Figure 2-1.

1. Testthe keypadby pressinga keyandcheckingthe
response.If theresponseiscorrect,repeatthisstep
until satisfied that there is not a problem with the
keypad. If the response is ever incorrect, the
keypad is defective. Replace the logic board
assembly.

2. Press the LAMP TEST key on the keypad.

3. If afterpressingtheLAMPTEST keysomeLEDson
thedisplaypanelareon, butat leastoneLED isnot
on, the status panel is defective. Replace the logic
board assembly.

4. If after pressing the LAMP TEST key some of the
character blocks on the LCD appear black, but at
least one character block is not black, the status
panel is defective. Replace the logic board
assembly.

5. If after pressing the LAMP TEST key no LEDs are
on, and the character blocks in the LCD are black,
verify that there is power to the system by
performing the steps outlinedin Section 4—Power
To The System. Check the P2 and P4 ribboncable
connections by performingthefollowingsteps. See
Appendix B FigureB-9 for locationof ribboncables
andotherpowersupplyboardcomponentsreferred
to in this section.

a. Disconnect all power sources.
b. Wait 30 seconds.

c. Being careful not to bend or break any of the

pins, remove both P2 and P4 ribbon cable
connectors.

d. Inspect the pins on the P2 and P4 ribbon cable

connectors.

e. If pinsarebent,carefullybendthemback. Ifpins

are broken, replace the ribbon cable connector.

f. Carefully reconnect P2 and P4 ribbon cable

connector.

g. If the problem still exists,replacethe logic board

assembly.

560442

Figure 4-2. The M340+ LCD display during a lamp

test

TP-5672 11/95

Controller Troubleshooting

4-3