Kohler MMS Instruction Manual

Automatic Transfer Switches
Models:
MMS/MNS
MMT/MNT
Electrical Controls:
E33+ Solid-State
TP-5662 2/00d
Operation and
Installation

TP-5662 2/00 Table of Contents
Table of Contents
Safety Precautions and Instructions I.........
Introduction i...............................
List of Related Materials i..........................
Service Assistance ii.........................
Service Information ii..............................
Product Information ii..............................
Section 1 Specifications 1....................
1.1 Standard Features 1.........................
1.2 Optional Features 1..........................
Section 2 Operation 3........................
2.1 Startup 3...................................
2.2 Controls and Indicators 4.....................
2.3 Manual Operation 4..........................
2.4 Automatic Operation 4.......................
2.4.1 Normal Power Source Failure 4........
2.4.2 Normal Power Source Restoration 5....
2.5 Programmed Transition Switch 6..............
2.5.1 Normal Power Source Failure 6........
2.5.2 Normal Power Source Restoration 6....
Section 3 Accessories 7......................
3.1 Typical Mounting Locations 8.................
3.2 DA-23—Plant Exerciser 9.....................
3.2.1 Clock Resetting Procedure 10..........
3.2.2 Initial Setup (Time and Day) Procedure
10..................................
3.2.3 Plant Exercise and Shutdown Timers
Programming Procedure 10............
3.2.4 Time Resetting Procedure 11...........
3.2.5 Reviewing the Program 11.............
3.2.6 Modifying an Existing Program 11.......
3.2.7 Manual Override Procedure 11.........
3.2.8 Continuous Manual Operation 11.......
3.2.9 Ending Continuous Manual Operation
11..................................
3.3 DA-24—Battery Charger 12....................
3.3.1 Specifications 12.....................
3.3.2 Installation Connections 13............
3.3.3 Disconnecting the Charger Before
Replacing or Servicing the Battery 14....
3.3.4 Reconnecting the Charger After
Replacing or Servicing the Battery 14....
3.3.5 Charging Lead-Acid Batteries 15........
3.3.6 Charging Nickel-Cadmium Batteries 15..
3.3.7 Charger Voltage Adjustment 15.........
3.3.8 Charger and Battery Maintenance 15....
3.4 DA-26—3-Phase Sensing 16...................
Section 4 Scheduled Maintenance 17...........
4.1 Inspection and Service 18.....................
4.1.1 General Inspection 18.................
4.1.2 Other Inspections and Service 19.......
4.2 Testing 19...................................
4.2.1 Weekly Generator Set Exercise 19......
4.2.2 Monthly Automatic Operation Test 19....
4.3 Service Schedule 20..........................
Section 5 Installation 21.......................
5.1 Receipt of Unit 21............................
5.1.1 Inspection 21.........................
5.1.2 Lifting 21............................
5.1.3 Storage 22...........................
5.1.4 Unpacking 22........................
5.2 Mechanical Installation 22.....................
5.3 Check Manual Operation 22....................
5.4 Electrical Wiring 22...........................
5.4.1 AC Power Connections 23.............
5.4.2 Controller Logic 24....................
5.4.3 Accessory and Control Connections 24..
5.5 Generator Set Preparation 25..................
5.6 Functional Tests 25...........................
5.6.1 Voltage Check 25.....................
5.6.2 Automatic Operation Test 26...........
5.7 Controller Setup 27...........................
5.8 Programmed Transition Setup 28...............
5.8.1 Description 28........................
5.8.2 Timing Adjustment for Programmed
Transition 28.........................
5.9 Ensure Warranty Registration 29................
Appendix A Abbreviations A-1................

TP-5662 2/00Table of Contents

TP-5662 2/00 ISafety Precautions and Instructions
Safety Precautions and Instructions
IMPORTANT SAFETY
INSTRUCTIONS. Electromechanical
equipment, including generator sets,
transfer switches, switchgear, and
accessories, can cause bodily harm
and pose life-threatening danger when
improperly installed, operated, or
maintained. To prevent accidents be
aware of potential dangers and act
safely. Read and follow all safety
precautions and instructions. SAVE
THESE INSTRUCTIONS.
This manual has several types of safety
precautions and instructions: Danger,
Warning, Caution, and Notice.
DANGER
Danger indicates the presence of a
hazard that will cause severe
personal injury, death,orsubstantial
property damage.
WARNING
Warning indicates the presence of a
hazard that can cause severe
personal injury, death, or substantial
property damage.
CAUTION
Caution indicates the presence of a
hazard that will or can cause minor
personal injury or property damage.
NOTICE
Notice communicates installation,
operation, or maintenance information
that is safety related but not hazard
related.
Safety decals affixed to the equipment
in prominent places alert the operator
or service technician to potential
hazards and explain how to act safely.
The decals are shown throughout this
publication to improve operator
recognition. Replace missing or
damaged decals.
Accidental Starting
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set.
Accidental starting can cause
severe injury or death. Before
working on the generator set or
connected equipment, disable the
generator set as follows: (1) Move the
generator set master switch to the OFF
position. (2) Disconnect the power to
the battery charger. (3) Remove the
battery cables, negative (--) lead first.
Reconnect the negative (--) lead last
when reconnecting the battery. Follow
these precautions to prevent starting of
the generator set by an automatic
transfer switch, remote start/stop
switch, or engine start command from a
remote computer.
Battery
Sulfuric acid in batteries.
Can cause severe injury or death.
Wear protective goggles and
clothing. Battery acid may cause
blindness and burn skin.
WARNING
Battery electrolyte is a diluted
sulfuric acid. Battery acid can cause
severe injury or death. Battery acid
can cause blindness and burn skin.
Always wear splashproof safety
goggles, rubber gloves, and boots
when servicing the battery. Do not
open a sealed battery or mutilate the
battery case. If battery acid splashes in
the eyes or on the skin, immediately
flush the affected area for 15 minutes
with large quantities of clean water.
Seek immediate medical aid in the case
of eye contact. Never add acid to a
battery after placing the battery in
service, as this may result in hazardous
spattering of battery acid.

TP-5662 2/00II Safety Precautions and Instructions
Explosion.
Can cause severe injury or death.
Relays in the battery charger
cause arcs or sparks.
Locate the battery in a well-ventilated
area. Isolate the battery charger from
explosive fumes.
WARNING
Battery gases. Explosion can cause
severe injury or death. Battery gases
can cause an explosion. Do not smoke
or permit flames or sparks to occur near
a battery at any time, particularly when
it is charging. Do not dispose of a
battery in a fire. To prevent burns and
sparks that could cause an explosion,
avoid touching the battery terminals
with tools or other metal objects.
Remove wristwatch, rings, and other
jewelry before servicing the equipment.
Discharge static electricity from your
body before touching batteries by first
touching a grounded metal surface
away from the battery. To avoid sparks,
do not disturb the battery charger
connections while the battery is
charging. Always turn the battery
charger off before disconnecting the
battery connections. Ventilate the
compartments containing batteries to
prevent accumulation of explosive
gases.
Hazardous Voltage/
Electrical Shock
Hazardous voltage.
Can cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
(600 volts and under)
WARNING
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING
Grounding electrical equipment.
Hazardous voltage can cause
severe injury or death. Electrocution
is possible whenever electricity is
present. Open the main circuit
breakers of all power sources before
servicing the equipment. Configure the
installation to electrically ground the
generator set, transfer switch, and
related equipment and electrical
circuits to comply with applicable codes
and standards. Never contact
electrical leads or appliances when
standing in water or on wet ground
because these conditions increase the
risk of electrocution.
Installing the battery charger.
Hazardous voltage can cause
severe injury or death. An
ungrounded battery charger may
cause electrical shock. Connect the
battery charger enclosure to the ground
of a permanent wiring system. As an
alternative, install an equipment
grounding conductor with circuit
conductors and connect it to the
equipment grounding terminal or the
lead on the battery charger. Install the
battery charger as prescribed in the
equipment manual. Install the battery
charger in compliance with local codes
and ordinances.
Connecting the battery and the
battery charger. Hazardous voltage
can cause severe injury or death.
Reconnect the battery correctly,
positive to positive and negative to
negative, to avoid electrical shock and
damage to the battery charger and
battery(ies). Have a qualified
electrician install the battery(ies).
Installing accessories to the
transformer assembly. Hazardous
voltage can cause severe injury or
death. To prevent electrical shock
disconnect the harness plug before
installing accessories that will be
connected to transformer assembly
primary terminals 76, 77, 78, and 79.
Terminals are at line voltage. (Models
with E33+, S340, S340+, 340, R340,
and R33 controls only)
Installing accessories to the
transformer assembly. Hazardous
voltage can cause severe injury or
death. To prevent electrical shock
disconnect the harness plug before
installing accessories that will be
connected to the transformer assembly
primary terminals on microprocessor
logic models. Terminals are at line
voltage.
Making line or auxiliary
connections. Hazardous voltage
can cause severe injury or death. To
prevent electrical shock deenergize the
normal power source before making
any line or auxiliary connections.

TP-5662 2/00 IIISafety Precautions and Instructions
Hazardous voltage.
Can cause severe injury or death.
Disconnect all power sources before
servicing. Install the barrier after
adjustments, maintenance, or
servicing.
(600 volts and under)
WARNING
Servicing the transfer switch.
Hazardous voltage can cause
severe injury or death. Deenergize all
power sources before servicing. Open
the main circuit breakers of all transfer
switch power sources and disable all
generator sets as follows: (1) Move all
generator set master controller
switches to the OFF position. (2)
Disconnect power to all battery
chargers. (3) Disconnect all battery
cables, negative (--) leads first.
Reconnect negative (--) leads last when
reconnecting the battery cables after
servicing. Follow these precautions to
prevent the starting of generator sets
by an automatic transfer switch, remote
start/stop switch, or engine start
command from a remote computer.
Before servicing any components
inside the enclosure: (1) Remove
rings, wristwatch, and jewelry. (2)
Stand on a dry, approved electrically
insulated mat. (3) Test circuits with a
voltmeter to verify that they are
deenergized.
Servicing the transfer switch
controls and accessories within the
enclosure. Hazardous voltage can
cause severe injury or death.
Disconnect the transfer switch controls
at the inline connector to deenergize
the circuit boards and logic circuitry but
allow the transfer switch to continue to
supply power to the load. Disconnect
all power sources to accessories that
are mounted within the enclosure but
are not wired through the controls and
deenergized by inline connector
separation. Test circuits with a
voltmeter to verify that they are
deenergized before servicing.
Hazardous voltage.
Can cause severe injury or death.
Only authorized personnel should
open the enclosure.
(600 volts and under)
WARNING
Short circuits. Hazardous
voltage/current 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
making adjustments or repairs.
Remove wristwatch, rings, and jewelry
before servicing the equipment.
Testing live electrical circuits.
Hazardous voltage or current can
cause severe injury or death. Have
trained and qualified personnel take
diagnostic measurements of live
circuits. Use adequately rated test
equipment with electrically insulated
probes and follow the instructions of the
test equipment manufacturer when
performing voltage tests. Observe the
following precautions when performing
voltage tests: (1) Remove rings,
wristwatch, and jewelry. (2) Stand on a
dry, approved electrically insulated
mat. (3) Do not touch the enclosure or
components inside the enclosure. (4)
Be prepared for the system to operate
automatically.
(600 volts and under)
Heavy Equipment
Unbalanced weight.
Improper lifting can cause severe
injury or death and equipment
damage.
Use adequate lifting capacity.
Never leave the transfer switch
standing upright unless it is securely
bolted in place or stabilized.
WARNING
Moving Parts
Hazardous voltage.
Can cause severe injury or death.
Operate the generator set only when
all guards and electrical enclosures
areinplace.
Moving rotor.
WARNING

TP-5662 2/00IV Safety Precautions and Instructions
Notice
NOTICE
Hardware damage. The transfer
switch may use both American
Standard and metric hardware. Use
the correct size tools to prevent
rounding of the bolt heads and nuts.
NOTICE
When replacing hardware, do not
substitute with inferior grade
hardware. Screws and nuts are
available in different hardness ratings.
To indicate hardness, American
Standard hardware uses a series of
markings, and metric hardware uses a
numeric system. Check the markings
on the bolt heads and nuts for
identification.
NOTICE
Improper operator handle usage.
Use the manual operator handle on the
transfer switch for maintenance
purposes only. Return the transfer
switch to the normal position. Remove
the manual operator handle, if used,
and store it in the place provided on the
transfer switch when service is
completed.
NOTICE
Foreign material contamination.
Cover the transfer switch during
installation to keep dirt, grit, metal drill
chips, and other debris out of the
components. Cover the solenoid
mechanism during installation. After
installation, use the manual operating
handle to cycle the contactor to verify
that it operates freely. Do not use a
screwdriver to force the contactor
mechanism.
NOTICE
Electrostatic discharge damage.
Electrostatic discharge (ESD)
damages electronic circuit boards.
Prevent electrostatic discharge
damage by wearing an approved
grounding wrist strap when handling
electronic circuit boards or integrated
circuits. An approved grounding wrist
strap provides a high resistance (about
1 megohm), not a direct short,to
ground.

TP-5662 2/00 i
Introduction
Introduction
This manual provides operation and installation
instructions for Kohlerrtransfer switches with E33+
electrical controls.
t:in:002:001
Information in this publication represents data available
at the time of print. Kohler Co. reserves the right to
change this literature and the products represented
without notice and without any obligation or liability
whatsoever.
Read this manual and carefully follow all procedures
and safety precautions to ensure proper equipment
operation and to avoid bodily injury. Read and follow the
Safety Precautions and Instructions section at the
beginning of this manual. Keep this manual with the
equipment for future reference.
The equipment service requirements are very important
to safe and efficient operation. Inspect parts often and
perform required service at the prescribed intervals.
Obtain service from an authorized service
distributor/dealer to keep equipment in top condition.
x:in:002:002
List of Related Materials
This manual covers operation and installation
information for the transfer switch’s electrical controls.
See the power switching device operation and
installation manual to decode the transfer switch model
number and verify that the transfer switch model and
electrical controls match the models shown on the front
cover of this manual before proceeding with operation or
installation.
A separate operation and installation manual that
covers the transfer switch’s power switching device
completes the operation and installation instructions for
the transfer switch. The transfer switch model number
shows which power switching device is installed on the
switch. The following table lists the available power
switching devices and the related operation and
installation manual part numbers.
Models (Power Switching Device)
Operation/
Installation
Manual
Model MMS/MNS (molded-case circuit
breaker or switch 40 to 1250 amp) TP-5658
Model MMS/MNS (circuit breaker or switch
1600 to 4000 amp) TP-5678
Model MMT/MNT (molded-case circuit
breaker or switch 40 to 1250 amp) TP-5973
Separate manuals cover service and parts information
for transfer switch power switching devices and
electrical controls. The following table(s) list the
available manual part number(s).
Models (Power Switching Device)
Service/
Parts Manual
Model MMS/MNS (molded case circuit
breaker or switch 40 to 4000 amp) TP-5666
Model MMT/MNT (molded-case circuit
breaker or switch 40 to 1250 amp) TP-5974
Electrical Controls (Type)
Service/
Parts Manual
E33+ (Solid-State) TP-5670
x:in:002:003

TP-5662 2/00ii Service Assistance
Service Assistance
Please contact a local authorized distributor/dealer for
sales, service, or other information about Kohler
Generator Division products.
Service Information
To locate a local authorized distributor/dealer inside
the U.S.A. and Canada
DLook on the product or in the information included with
the product
DConsult the Yellow Pages under the heading
Generators— Electric
DVisit the Kohler Generator Division web site at
www.kohlergenerators.com
DCall 1-800-544-2444
To locate a local authorized distributor/dealer
outside the U.S.A. and Canada
DLook on the product or in the information included
with the product
DConsult the telephone directory under the heading
Generators—Electric
DVisit the Kohler Generator Division web site at
www.kohlergenerators.com
DContact the nearest regional office
Africa, Europe, Middle East
London Regional Office
Langley, Slough, England
Phone: [phone]
Fax: [phone]
Australia
Australia Regional Office
Queensland, Australia
Phone: [phone]
Fax: [phone]
China
China Regional Office
Shanghai, People’s Republic of China
Phone: [phone]
Fax: [phone]
India, Bangladesh, Sri Lanka
India Regional Office
Bangalore, India
Phone: [phone]
(91) 80-2284279
Fax: [phone]
Japan
Japan Regional Office
Tokyo, Japan
Phone: [phone]
Fax: [phone]
Latin America
Latin America Regional Office
Lakeland, Florida, U.S.A.
Phone: [phone]
Fax: [phone]
South East Asia
Singapore Regional Office
Singapore, Republic of Singapore
Phone: [phone]
Fax: [phone]
Product Information
Product identification numbers determine service parts.
Record the product identification numbers in the spaces
below immediately after unpacking the products so that
the numbers are readily available for future reference.
Record field-installed kit numbers after installing the
kits.
Trans
f
er S
w
itch Identi
f
ication Numbers
Record the product identification numbers from the
transfer switch nameplate.
Model Number
Serial Number
Accessory Number Accessory Description

TP-5662 2/00 1Section 1 Specifications
Section 1 Specifications
The following specifications are for Kohlerrtransfer
switches with the E33+ electrical control system. See
the power switching device operation and installation
manual for power switching device specifications and
other transfer switch features. See List of Related
Materials in the Introduction section of this manual.
1.1 Standard Features
DSolid-state electrical controls for KohlerrModel
MMS/MNS and MMT/MNT transfer switches.
DNormal source single-phase voltage sensing fixed at
70% for dropout and 90% for pickup.
DEmergency source single-phase sensing pickup
fixed at 85% of rated voltage and 95% of rated
frequency.
DTest switch maintained—simulates a normal source
power failure.
DLamps indicating normal and emergency source
availability and switch position.
DEngine-start contacts provided.
DTime delay engine start (TDES) fixed at 3.0 seconds.
DTime delay emergency-to-normal (TDEN) fixed at
5 minutes.
DProgram transition available. Individual time
adjustment of 2 to 40 seconds off-to-emergency
(TDOE) and off-to-normal (TDON). Switch will stop in
the Off position (neither source connected) for the
TDOE or TDON time.
DAll printed circuit boards conformally coated for
environmental protection.
1.2 Optional Features
See Section 3, Accessories, for details of optional
features selected. The transfer switch’s nameplate
includes a list of factory-installed accessories.
DPlant exerciser, solid-state, digital display, 7- or
14-day, no load.
DBattery charger, 2-ampere float, 12- and 24-volt.
D3-phase sensing, normal source fixed at 70% for
dropout and 90% for pickup for all phases.

TP-5662 2/002 Section 1 Specifications
Notes

TP-5662 2/00 3Section 2 Operation
Section 2 Operation
Hazardous voltage.
Can cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
(600 volts and under)
WARNING
Schedule preventive maintenance on the transfer
switch at regular intervals after installation. See
Section 4 for preventive maintenance.
Contact an authorized service center to inspect and
service the transfer switch when any wear, damage,
deterioration, or malfunction of the transfer switch or its
components is evident or suspected; do not energize
the switch.
2.1 Startup
Perform the following powerup procedure after
maintenance or service of the standby system when
power sources were disconnected from the transfer
switch, not for initial startup.
For initial startup, follow the instructions in the
installation section of the operation and installation
manual for the power switching device and Section 5,
Installation, in this manual.
Read and understand documentation provided with the
switch and labels affixed to the switch. Review the
operation of installed accessories.
Follow the steps below to power up the transfer switch
and prepare it for automatic operation.
Powerup Procedure
1. Place the generator set master switch in the OFF
position to prevent starting the generator set.
2. Disconnect both the normal and emergency power
sources by opening circuit breakers or switches
leading to the transfer switch.
3. Open the transfer switch enclosure door and check
that the wire harnesses for the power switching
device and the controller are plugged together at
the inline disconnect plug P1. See Figure 5-1.
4. Follow the manual operation procedure to prepare
the transfer switch for automatic operation. See
the power switching device operation and
installation manual for instructions.
5. Close and lock the transfer switch enclosure door.
Replace and tighten any fastening screws on the
enclosure door.
6. Prepare the standby generator set for operation.
Check the oil level, coolant level, fuel supply,
batteries, and items specified by the generator set
prestart checklist or similar instructions in the
operation manual.
7. Place the generator set master switch in the AUTO
position. The generator set should start.
8. When loads are ready to be energized, close circuit
breakers or switches leading to the transfer switch.
9. Perform an automatic operation test. See
Section 5.6.2.

TP-5662 2/004 Section 2 Operation
2.2 Controls and Indicators
Some of the switches and indicators located on the
transfer switch enclosure door may be optional
accessories. See Figure 2-1.
2
3
1
5
4
1. Normal Position (green) lights when the load is connected to
the normal source.
2. Emergency Position (red) lights when the load is connected
to the emergency source.
3. Emergency Source Available (white) lights when the
emergency source is acceptable.
4. Test Switch. The normal position allows automatic transfer
switch operation. The test position signals the generator set
to start.
5. Normal Source Available (white) lights when the normal
source is acceptable.
321159
TO INSURE AGAINST SHOCK
OR BURNS, DISCONNECT ALL
SUPPLY SOURCES BEFORE
WORKING ON THIS SWITCH
WARNING
AUTO
CAUTION:
AFTER TEST IS COMPLETED
RETURN SWITCH TO AUTO
POSITION.
EMERGENCYNORMAL
TRANSFER SWITCH POSITION
NORMAL EMERGENCY
SOURCE AVAILABLE
TEST
Figure 2-1 Transfer Switch Controls and Indicators
2.3 Manual Operation
Manually operate the power switching device to prepare
the transfer switch for automatic operation, to reset a
tripped circuit breaker, or to test or troubleshoot the unit.
Refer to the power switching device operation and
installation manual to operate the transfer switch
manually.
2.4 Automatic Operation
Controller circuitry, programming, or accessories
determine when a power source is acceptable, has
failed, or is restored and operates accordingly. A power
source is acceptable when the voltage and/or frequency
on all sensed phases rise above preset levels. Failure of
a power source occurs when the voltage and/or
frequency on one or more sensed phases fall below
preset levels. A power source is restored when it
becomes acceptable after failing. Typical ATS operation
is divided into two sequences:
DFailure of the normal power source and the
resulting transfer to the emergency source or
Emergency.
DRestoration of the normal power source and the
resulting transfer back to the normal source or
Normal.
The following sections explain these automatic
sequences of operation for a standard controller with a
limited number of accessories that affect the sequence
of operation. Installed controller accessories can
change the sequence of operation given here; review
the operation of any optional accessories on the transfer
switch. See Section 3, Accessories.
2.4.1 Normal Power Source Failure
The following sequence describes the system response
to a normal power source failure. See Figure 2-2.
1. Normal Power Source Fails. The normal source
acceptable relay (K2) on the controller’s main logic
circuit board deenergizes when the voltage on any
sensed phase of the normal power source falls
below the dropout level. The normal source
available indicator lamp turns off. See Figure 2-1
and Figure 5-2.
2. NR Relay Deenergizes and Engine Start Time
Delay Starts. When the K2 relay deenergizes, the
NR relay on the interface circuit board

TP-5662 2/00 5Section 2 Operation
deenergizes. Also, the time delay engine start
(TDES) relay, located on the main controller circuit
board, begins its timing cycle. See Figure 5-2 and
Figure 5-3. TDES prevents nuisance starting of
the generator set during brief power outages. If the
normal source voltage on all sensed phases rises
above the pickup level before the TDES relay times
out, the K2 and NR relays reenergize and the
controller resets all circuits for any future normal
source failure.
3. Generator Signalled to Start. When the TDES
relay times out, it deenergizes and the engine start
contact closes to signal the generator set to start.
Controller circuitry monitors the emergency power
source for acceptability.
4. Emergency Source Becomes Acceptable and
Starts a Time Delay to Transfer to Emergency.
Controller circuitry energizes the emergency
source acceptable relay K1, located on the main
logic circuit board, when the voltage and frequency
on one sensed phase of the emergency source
reach the pickup levels. The emergency source
available lamp lights. See Figure 2-1 and
Figure 5-2.
5. Switch Transfers Load to Emergency. When the
emergency source is acceptable, the emergency
relay (ER) on the interface circuit board energizes.
See Figure 5-3. When the ER relay energizes, the
power switching device transfers the load to the
emergency source. The transfer switch is now
supplying the load from the emergency source and
remains latched in this position until the normal
source is restored.
Normal Power Source Fails
Time Delay Engine Start (TDES)
Switch Transfers Load to Emergency Source
Figure 2-2 ATS Sequence of Operation, Normal
Power Source Failure
2.4.2 Normal Power Source Restoration
The following sequence describes system response to
normal source restoration. See Figure 2-3. In this
sequence of operation, if the emergency power source
fails and the normal source is acceptable, the ATS
bypasses all time delays in the sequence and transfers
the load immediately to the normal source.
1. Normal Power Source Returns. Controller
circuitry starts the time delay emergency-to-normal
(TDEN) when the normal source is acceptable.
The normal source is acceptable when the voltage
level on all sensed phases rise above the voltage
pickup level. TDEN allows time for the normal
source to stabilize before load reconnection. If the
emergency source fails (voltage or frequency on
one phase falls below the dropout level) during this
timing cycle, the K1 relay deenergizes and the
controller signals the power switching device to
immediately transfer the load to the normal source,
if the normal source is acceptable.
2. Switch Transfers Back to Normal When TDEN
times out, the K2 relay energizes which, in turn,
energizes the NR relay, and the ER relay
deenergizes. The power switching device
transfers the load back to the normal source.
3. Generator Set Receives Signal to Shut
Down When the K2 relay energizes it causes the
time delay engine start (TDES) relay to energize,
which signals the generator set to shut down by
opening the engine start contact. All circuits reset
for any future normal source failure.
Normal Power Source Returns
Time Delay Emergency-to-Normal (TDEN)
Switch Transfers Load to Normal Power Source
Figure 2-3 ATS Sequence of Operation, Normal
Power Source Restoration

TP-5662 2/006 Section 2 Operation
2.5 Programmed Transition Switch
2.5.1 Normal Power Source Failure
The sequence for programmed transition follows. See
Figure 2-4. Refer to Section 5.8.2 for the programmed
transition relay timing adjustment procedure.
1. The normal power source fails.
2. The TDES (time delay engine start) timer begins.
3. The TDES ends timing, indicating the engine has
been signalled to start.
4. The generator power source becomes acceptable
after the generator reaches rated voltage and
frequency.
5. The switch transfers to the Off position. The load is
disconnected from both power sources.
6. The TDOE (time delay off-to-emergency) timer
begins.
7. The TDOE timer ends.
8. The switch transfers the load to the emergency
source.
Time Delay Engine Start (TDES)
Switch Transfers to Off position
Time Delay Off-to-Emergency (TDOE)
Switch Transfer to Emergency Position
Normal Power Source Fails
Figure 2-4 ATS Sequence of Operation, Normal
Power Source Failure
2.5.2 Normal Power Source Restoration
The sequence for programmed transition follows. See
Figure 2-5.
1. The normal power source is acceptable.
2. The TDEN (time delay emergency-to-normal)
timer begins.
3. The TDEN timer ends.
4. The switch transfers to the Off position. The load is
disconnected from both power sources.
5. The TDON (time delay off-to-normal) timer begins.
6. The TDON timer ends.
7. The switch transfers the load to the normal source.
Time Delay Emergency-to-Normal (TDEN)
Switch Transfers to Off Position
Switch Transfers to Normal Position
Time Delay Off-to-Normal (TDON)
Normal Power Source Returns
Figure 2-5 ATS Sequence of Operation, Normal
Power Source Restoration

TP-5662 2/00 7Section 3 Accessories
Section 3 Accessories
Determine factory-installed accessories by examining
the transfer switch nameplate. This section describes
optional accessories available on KohlerrModel
MMS/MNS and MMT/MNT transfer switches with E33+
solid-state electrical controls. All accessories are
UL1008 listed.
Accidental starting.
Can cause severe injury or death.
Disconnect the battery cables before
working on the generator set.
Remove the negative (--) lead first
when disconnecting the battery.
Reconnect the negative (--) lead last
when reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting can
cause severe injury or death. Before working on the
generator set or connected equipment, disable the generator
set as follows: (1) Move the generator set master switch to the
OFF position. (2) Disconnect the power to the battery charger.
(3) Remove the battery cables, negative (--) lead first.
Reconnect the negative (--) lead last when reconnecting the
battery. Follow these precautions to prevent starting of the
generator set by an automatic transfer switch, remote
start/stop switch, or engine start command from a remote
computer.
Hazardous voltage.
Can cause severe injury or death.
Disconnect all power sources before
opening the enclosure.
(600 volts and under)
WARNING
Grounding electrical equipment. Hazardous voltage can
cause severe injury or death. Electrocution is possible
whenever electricity is present. Open the main circuit
breakers of all power sources before servicing the equipment.
Configure the installation to electrically ground the generator
set, transfer switch, and related equipment and electrical
circuits to comply with applicable codes and standards. Never
contact electrical leads or appliances when standing in water
or on wet ground because these conditions increase the risk of
electrocution.
Installing the battery charger. Hazardous voltage can
cause severe injury or death. An ungrounded battery
charger may cause electrical shock. Connect the battery
charger enclosure to the ground of a permanent wiring system.
As an alternative, install an equipment grounding conductor
with circuit conductors and connect it to the equipment
grounding terminal or the lead on the battery charger. Install
the battery charger as prescribed in the equipment manual.
Install the battery charger in compliance with local codes and
ordinances.
Connecting the battery and the battery charger.
Hazardous voltage can cause severe injury or death.
Reconnect the battery correctly, positive to positive and
negative to negative, to avoid electrical shock and damage to
the battery charger and battery(ies). Have a qualified
electrician install the battery(ies).
Installing accessories to the transformer assembly.
Hazardous voltage can cause severe injury or death. To
prevent electrical shock disconnect the harness plug before
installing accessories that will be connected to transformer
assembly primary terminals 76, 77, 78, and 79. Terminals are
at line voltage. (Models with E33+, S340, S340+, 340, R340,
and R33 controls only)
Making line or auxiliary connections. Hazardous voltage
can cause severe injury or death. To prevent electrical
shock deenergize the normal power source before making any
line or auxiliary connections.

TP-5662 2/008 Section 3 Accessories
Hazardous voltage.
Can cause severe injury or death.
Disconnect all power sources before
servicing. Install the barrier after
adjustments, maintenance, or
servicing.
(600 volts and under)
WARNING
Servicing the transfer switch. Hazardous voltage can
cause severe injury or death. Deenergize all power sources
before servicing. Open the main circuit breakers of all transfer
switch power sources and disable all generator sets as
follows: (1) Move all generator set master controller switches
to the OFF position. (2) Disconnect power to all battery
chargers. (3) Disconnect all battery cables, negative (--) leads
first. Reconnect negative (--) leads last when reconnecting the
battery cables after servicing. Follow these precautions to
prevent the starting of generator sets by an automatic transfer
switch, remote start/stop switch, or engine start command
from a remote computer. Before servicing any components
inside the enclosure: (1) Remove rings, wristwatch, and
jewelry. (2) Stand on a dry, approved electrically insulated
mat. (3) Test circuits with a voltmeter to verify that they are
deenergized.
Servicing the transfer switch controls and accessories
within the enclosure. Hazardous voltage can cause
severe injury or death. Disconnect the transfer switch
controls at the inline connector to deenergize the circuitboards
and logic circuitry but allow the transfer switch to continue to
supply power to the load. Disconnect all power sources to
accessories that are mounted within the enclosure but are not
wired through the controls and deenergized by inline
connector separation. Test circuits with a voltmeter to verify
that they are deenergized before servicing.
NOTICE
Electrostatic discharge damage. Electrostatic discharge
(ESD) damages electronic circuit boards. Prevent
electrostatic discharge damage by wearing an approved
grounding wrist strap when handling electronic circuit boards
or integrated circuits. An approved grounding wrist strap
provides a high resistance (about 1 megohm), not a direct
short, to ground.
3.1 Typical Mounting Locations
See Figure 3-1 for typical mounting locations for
accessories. The mounting locations of accessories
may vary when the transfer switch has multiple
accessories. See Figure 2-1 for a closeup view of
controls and indicators on the front of the enclosure.
BD-320000B
21
3
1. DA-24—Battery charger, 12 or 24 VDC
2. DA-23—Plant exerciser timer
3. DA-26—3-Phase sensing accessory
P4
P15
TR1
TR2
F
U
S
E
4
F
U
S
E
3
F
U
S
E
21
E
S
U
F
1234
P8
P9
P2 P3
P1
Figure 3-1 Typical E33+ Inner Panel Accessory
Mounting Locations

TP-5662 2/00 9Section 3 Accessories
3.2 DA-23—Plant Exerciser
Accessory DA-23-Z plant exerciser contains a 14-day
programmable timer that periodically runs the
emergency source generator set. The exerciser timer is
mounted below the main logic circuit board on the inner
panel of the enclosure door.
Exercising the generator set under load once a week for
a minimum of 30 minutes helps to maximize the
reliability of the emergency power system.
The plant exerciser closes the engine start contacts
directly, operating the generator set unloaded. The
transfer switch only transfers to the emergency source if
the normal source fails during the exercise period.
The plant exerciser has a liquid crystal display (LCD)
panel that shows various exerciser information and four
pushbuttons to enter information. See Figure 3-2. The
following sections detail how to set the exerciser.
12
5
678
9
11
3
12
13
10
4
12
/
Pr
24
12
18
6:00
6
®
1
C
3
+
1. Blinking clock symbol = set time of day.
Constant clock symbol = time switch running.
2. Generator start contact state, half shaded = on,
no shading = off.
3. Segment display of first program, 1 segment = 15 min.
4. Segment display of second program, 4 programs per day max.
5. Symbol of program input.
6. Set button stores the programs to memory. Also used to
override the program.
7. Plus button increases time in increments for programs.
8. Arrow button changes from day to hour:minute. Copy start and
shutdown times from one day to the next.
9. Week button alternates between week one and week two.
10. Displays week one or week two.
11. Actual day of the week or program day.
12. Real time, set start time or set shutdown time.
13. Hand symbol blinking = continuous manual operating.
14. Hand symbol constant = manual override.
TT-1255
Figure 3-2 Exercise Timer

TP-5662 2/0010 Section 3 Accessories
3.2.1 Clock Resetting Procedure
1. Lift the bottom flap of the timer’s front cover to
open.
2. Simultaneously press and hold the ARROW (®),
PLUS (+), and SET ( ) buttons for 10 seconds.
SeeFigure3-2.
3. Continue to depress the ARROW (®) button and
simultaneously release the PLUS (+) and SET ( )
buttons.
4. Release the ARROW (®) button when all
segments of the LCD display appear.
3.2.2 Initial Setup (Time and Day)
Procedure
1. Press the ARROW (®) button once. The clock
symbol and the program day flash.
2. Press and release the PLUS (+) button until the
current day of the week displays. Monday is day 1,
Sunday is day 7.
3. Press the ARROW (®) button once when the
current day displays.
4. Press and release the PLUS (+) button to increase
the hour. Press the ARROW (®) button once to
enter the hour. The timer runs from 1 to 24 hours,
not am/pm.
5. Press and release the PLUS (+) button to increase
the minutes. Hold the PLUS (+) button to increase
the minutes by 5.
6. Press the ARROW (®) button once to enter the
minute. After the minute has been entered, PR
(program) flashes on the exerciser’s display, and
the number 1 in the display’s lower left corner
indicates the week.
3.2.3 Plant Exercise and Shutdown
Timers Programming Procedure
1. Press and release the ARROW (®) button to
advance to the desired exercise day. If the
exercise day is in week 1, proceed to step 2. If the
exercise day is in week 2, continue with step 1a.
a. Press and release the ARROW (®) button to
advance to day 7.
b. Press the ARROW (®) button once.
c. Press the WEEK (1/2) button once. The
number 2 in the display’s lower left corner
indicates the week.
d. Press and release the ARROW (®) button four
times to advance to the desired exercise day.
2. Press or hold the PLUS (+) button to set the
exercise start time.
3. Press the SET ( ) button to save the exercise
start time.
4. Press or hold the PLUS (+) button to set the
exercise shutdown time. Bar segments fill the
display to identify the start time.
5. Press the SET ( ) button to save the exercise
shutdown time.
6. Press the ARROW (®) key to advance to the next
exercise day.
7. Press the PLUS (+) and SET ( ) buttons
simultaneously to clear the setting if the exercise
start and shutdown times are different from the
previous day or do not apply to the current day.
Repeat steps 2--6 to set the exercise start and
shutdown times for each day of the week.
8. Press the ARROW (®) button once to complete
programming when day 7 of week 1 or week 2
displays. The program is complete and ready to
run when the clock icon is in the upper left corner of
the exerciser’s display.

TP-5662 2/00 11Section 3 Accessories
3.2.4 Time Resetting Procedure
1. Perform Initial Setup (Time and Day) Procedure
steps1to5(Section3.2.2).
2. Press and release the ARROW (®) button eight
times until the clock icon appears.
3.2.5 Reviewing the Program
Continue to press and release the ARROW (®) button
to review the programmed start and shutdown times.
3.2.6 Modifying an Existing Program
Use one of the following procedures to reprogram a
previously entered program.
Reprogramming Procedure for Setting Weeks and
Days
1. Press the WEEK (1/2) button to choose week 1 or
week 2.
2. Press the ARROW key (®) four times.
3. Perform the procedure listed under Plant Exercise
and Shutdown Timers Programming Procedure.
4. Cancel the entered program for every day by
pressing the PLUS (+) and SET ( ) buttons
simultaneously.
5. Enter the new program for every day
Reprogramming Procedure for Resetting the
Clock
1. Reset the clock as described under Time Resetting
Procedure.
2. Perform the steps listed under Setup (Time and
Day) Procedure (Section 3.2.2).
3.2.7 Manual Override Procedure
Use the following procedure to manually override the
exercise timer and start or stop the generator.
1. Press and release the SET ( ) button once. The
generator start contact changes state.
2. Press and release the SET ( ) button again to
end manual override. The generator start contact
changes state. If manual override is not ended, the
timer automatically continues with the program at
the next preset on or off time.
3.2.8 Continuous Manual Operation
Perform the following steps for continuous manual
operation of the generator.
1. Press the SET ( ) button for two seconds until the
hand icon ( ) flashes.
If the generator start contact is on ( ), the
segmented display appears. If the generator start
contact is off ( ), the segmented display does not
appear.
2. Press and release the SET ( ) button to cause
the generator start contact to change state.
3.2.9 Ending Continuous Manual
Operation
To end continuous manual operation, press the SET
() button for two seconds until the clock icon appears
in the display.