10
OPM-108/B
A.C. ELECTRICAL CONNECTIONS
NOTICE: CLASS 1 WIRING METHODS ARE TO BE USED
FOR ALL FIELD WIRING CONNECTIONS TO TERMINALS
OF A CLASS 2 CIRCUIT
All wiring must be completed in accordance with the
National Electric Code as well as any state and local codes.
You must pay particular attention to wire size requirement
for the amperage of service you are dealing with. The table
below provides you guidance on wire sizing based on both
wire type and amperage.
Wire amperages have been
derated for 40° C ambient temperatures operation.
WARNING:
Make sure the generator is disconnected from the battery to
prevent accidental starting.
A. NEUTRAL LUGS:
These lugs are isolated from ground and provided for you
to connect your neutral wire from the transfer switch to the
generator.
The 1200 Amp terminal block lugs on the 300-350kW will
handle wire sizes #3/0 to 600 MCM and should be torqued
to 28 ft. lbs.
The 1000 Amp terminal block lugs on the 250kW will
handle wire sizes #3/0 to 500 MCM and should be torqued
to 28 ft. lbs. (Rated for 900 Amp for AL)
B. GENERATOR CIRCUIT BREAKER:
This circuit breaker provides overload protection for the
generator. Your power feeds from the transfer switch
12
5040-00
60708-166
MOUNTING THE AUTOMATIC
TRANSFER SWITCH (A.T.S.)
*************
***** WARNING *****
*************
FIRE HAZARD - All wiring must be done by a licensed
electrician, and must conform to the National Electrical
Code and comply with all state and local codes and
regulations. Check with the local authorities before
proceeding!
INSTALLATION NOTES
Because of the many different types of service, feeder, and
distribution equipment, no specifi c wiring instructions can be
provided. It is recommended that only copper wire be used.
In all cases it is essential that while the load is connected to
the generator, there can be absolutely no feedback from the
generator to the power line or the power line to the generator.
When properly installed, the normal A.T.S. Control and safety
systems will eliminate all paths for feedback.
To wire the automatic transfer switch into the existing wiring, fi rst
determine which circuits will be on the emergency load circuit.
If the entire load is to be transferred, the transfer switch can
be wired in directly after the watt-hour meter and the service
entrance, providing the service entrance ampere rating is within
the transfer switch’s rated capability.
If only specifi c circuits are to be powered under emergency
power failure conditions, an additional distribution panel
designated “emergency distribution panel” must be installed.
All selected emergency circuits are removed from main
distribution panels and installed in the emergency distribution
panel. The A.T.S. is then installed between the main panel and
the emergency distribution panel. Suggested circuits: freezer,
refrigerator, furnace, emergency lights, sump pump, emergency
outlet circuits, etc. Total running load must not exceed generator
rating.
A.C. ELECTRICAL
CONNECTIONS
NOTICE - CLASS 1 WIRING METHODS ARE TO BE USED
FOR ALL FIELD WIRING CONNECTIONS TO TERMINALS
OF A CLASS 2 CIRCUIT
All wiring must be completed in accordance with the Nation
Electric Code as well as any state or local codes.
You must pay particular attention to wire size requirement for
the amperage of service you are dealing with. Appendix “2”
provides you guidance on wire sizing based on both wire type
and amperage.
Wire amperage’s have been derated for 40
o
C
ambient temperatures operation.
A - Neutral Lugs,
These neutral lugs are isolated from ground
and provided for you to connect your neutral wire from the
transfer switch to the generator.
The 1200 amp terminal block lugs on the 300 to 350 kW will
handle wire sizes #3/0 to 600 MCM and should be torqued to 28
ft. lbs.
The 1000 amp terminal block lugs on the 250 kW will handle
wire sizes #3/0 to 500 MCM and should be torqued to 28 ft. lbs.
(Rated for 900 AMP for AL)
B - Generator Circuit Breaker,
This circuit breaker provides
overload protection for the generator. Your power feeds from
the transfer switch will connect to the bottom lugs on the circuit
breaker. The generator power feeds have already been wired
into the upper lugs.
Please refer to the circuit breaker installed on your unit for
breaker lug capacities and proper torque specifi cations.
To select the proper conductor size between the Generator
and the ATS, fi rst look your model up in Table 1 of Appendix
“A” for your generator amperage. Then refer to Appendix “2” for
guidance on wire sizing based on both wire type and amperage.
Wire amperages have been derated for 40
o
C ambient
temperatures operation.
For additional information on wire sizing refer to table 310-16 of
the National Electrical Code ANSI/NFPA 70.
C - Ground Lug
, These ground lugs are bonded to ground
and are provided for you to connect your ground wire from the
transfer switch to. The lugs will handle wire sizes #6 AWG to 300
MCM and should be torqued to 21 ft. lbs.
CONNECTING BATTERY CHARGER &
BLOCK HEATER
A three-stage battery charger is provided standard on
this unit. The charger is an Automatic Battery Charger &
Maintainer. This charger has three rates of charging. During
the first mode, known as Bulk charging, the charging
current is limited to 10 Amps at a voltage of up to 14/27
Volts. The yellow LED will be on constantly during this
stage. When the charging rate drops to 2.5 Amps, the
charge will enter the ABSORPTION charging mode. During
this mode, the yellow LED will be flashing. The charging
voltage is held at 14/27 Volts and the charging rate
gradually reduces the amount of current (Amps) flowing to
the battery to 100% charged state. The battery can be left
on this mode indefinitely. During this mode, the green LED
will be on constantly.
This charger is mounted under the customer connection
on the control side of the generator and plugged into the
receptacle mounted in the AC connection cabinet. The
battery charger receptacle is to be powered by a GFCI
circuit and installed in accordance with the United States
National Electric Code. It is suggested that this circuit be
fused for 15 amps. The block heaters on these units are
1000 watt on the DR175 and 2250 watt on the larger units.
The 2250 watt heaters and will require a separate 20 amp
GFCI fused circuit. They are labeled Battery Charger Circuit
and Block Heater Circuit.
The engine block heater installed on this unit should
also be plugged in this receptacle. The block heater is
thermostatically controlled and when plugged in will
maintain the engine coolant temperature between 100 and
120 degrees F.
MOUNTING THE AUTOMATIC
TRANSFER SWITCH
WARNING: FIRE HAZARD:
All wiring must be done by a licensed electrician, and must
conform to the National Electrical Code and comply with
all the local codes and regulations. Check with the local
authorities before proceeding.
INSTALLATION NOTES:
Because of many different types of service, feeder and
distribution equipment, no specific wiring instructions can
be provided. It is recommended that only copper wire
be used. In all cases it is essential that while the load is
connected to the generator, there can be absolutely no
feedback from the generator to the power line or the power
line to the generator. When properly installed, the normal
ATS Control and safety system will eliminate all paths and
feedback.
To wire the automatic transfer switch into existing wiring,
first determine which circuits will be on the emergency load
circuit. If the entire load is transferred, the transfer switch
can be wired directly after the watt-hour meter and the
service entrance, providing the service entrance ampere
rating is within the transfer switch’s rated capability.
If only specific circuits are to be powered under emergency
power failure conditions, an additional distribution panel
designated “emergency distribution panel” must be
installed.
All selected emergency circuits are removed from main
distribution panels and installed in the emergency
distribution panel. The ATS is then installed between
the main panel and the emergency distribution panel.
Suggested circuits: freezer, refrigerator, furnace, emergency
lights, sump pump, emergency outlet circuits, etc. Total
running load must not exceed generator rating.
