Page 2
1017-10
60706-144
TESTING POLICY:
Before any generator is shipped from the factory, it is
fully checked for performance. The generator is loaded to
its full capacity, and the voltage, current, and frequency
are carefully checked.
Rated output of generators is based on engineering tests
of typical units, and is subject to, and limited by, the tem-
perature, altitude, fuel, and other conditions specified by
the manufacturer of the applicable engines.
INTRODUCTION AND DESCRIPTION
The package standby engine-generator set includes all
items necessary for a completely automatic standby power
system as standard equipment. The entire package is
then tested to insure proper operation of all components
and the total systems performance and reliability.
DESCRIPTION
This packaged power system is designed to automati-
cally provide standby power to unattended loads during
electrical outages. Upon an interruption of normal electri-
cal service this packaged power system electrical control
circuits will automatically start the engine. The generator
will produce electrical power and the Automatic Transfer
Switch (A.T.S.) will automatically transfer the electrical
loads to the engine-generator set. Upon restoration of nor-
mal electrical service the emergency transfer switch will
sense return of the normal commercial power. The Auto-
matic Transfer Switch will retransfer the load back to nor-
mal commercial power source. The engine control circuits
will begin a 3 minute cool-down cycle, after which the fuel
supply will be shut off and the engine ignition system dis-
abled.
These packaged power systems consist of two major
components:
1) AUTOMATIC TRANSFER SWITCH
The table below shows the different Automatic Switch
sizes shipped with each unit.
CONTACTOR RATING
MODEL
VOLTAGE
LINE
GENERATOR
PSS50000-3
120/240
400
320
PSS50000-4
120/208
230
230
PSS50000-17
120/240
230
230
PSS50000-18
277/480
100
100
PSS65000-3
120/240
400
320
PSS65000-4
120/208
230
230
PSS65000-17
120/240
230
230
PSS65000-18
277/480
225
225
These Automatic Transfer Switchs (A.T.S.) are wall
mount switches designed for inside installation. The
A.T.S. consists of a line side contactor and a generator
side contactor. The contactors are both electrically and
mechanically interlocked. A seven day electronic exer-
ciser clock are installed in the A.T.S. as standard equip-
ment. The A.T.S. also contains the power failure sensing
circuitry necessary to send a start/stop signal to the engine
generator set.
2) ENGINE/GENERATOR
PSS50000 - The engine generator set consists of a GM
Industrial, eight cylinder, liquid cooled , 5.7L engine
equipped to run on L.P. or N.G. fuel. The engine operates
at 1800 rpm and frequency regulation is maintained by the
engine governor within .5 cycles variation, from no load to
rated load. The 50,000 watt (50kW) generator is a single
bearing, direct drive, rotating field design. The generator is
connected to the engine flywheel via flexible drive disks.
The engine generator is mounted in a drip proof enclosure
for outside installation. Connection boxes are provided to
all customer connections (both AC output and DC control).
A customer supplied 12 Volt, 650 CCA (BCI group 24)
battery is required to complete the installation. Engine op-
eration is controlled by an Electronic Engine Control Mod-
ule (E.C.M.) mounted in the engine generator enclosure.
The E.C.M. is equipped standard with a 3 second start de-
lay, 3 minute cool down delay and cycle cranking consist-
ing of five, 12 second on/12 second off cycles. The ECM
has both oil pressure and high water temperature delays
built into the starting circuit. During initial start up the oil
pressure delay is 12 seconds, to allow the engine time to
build oil pressure, before a shutdown will occur. The high
water temperature shutdown has a 60 to 90 second lock-
out, allowing the engine time to clear the hot water out of
the block in case of a hot restart. In addition if the genera-
tor should lose output during a run cycle the engine will
continue to run for about 60 seconds and then shutdown
and display an overcrank light. The starter will not reen-
gage during this time or until the generator selector switch
has been cycled off and back on. This is the only way to
clear a fault light.
PSS65000 - The engine generator set consists of a GM
Industrial, eight cylinder, liquid cooled , 7.4L engine
equipped to run on L.P. or N.G. fuel. The engine operates
at 1800 rpm and frequency regulation is maintained by the
engine governor within .5 cycles variation, from no load to
rated load. The 65,000 watt (65kW) generator is a single
bearing, direct drive, rotating field design. The generator is
connected to the engine flywheel via flexible drive disks.
The engine generator is mounted in a drip proof enclosure
for outside installation. Connection boxes are provided to
all customer connections (both AC output and DC control).
A customer supplied 12 Volt, 650 CCA (BCI group 24)
battery is required to complete the installation. Engine op-
eration is controlled by an Electronic Engine Control Mod-
ule (E.C.M.) mounted in the engine generator enclosure.
The E.C.M. is equipped standard with a 3 second start de-
lay, 3 minute cool down delay and cycle cranking consist-
ing of five, 12 second on/12 second off cycles. The ECM
has both oil pressure and high water temperature delays
built into the starting circuit. During initial start up the oil
pressure delay is 12 seconds, to allow the engine time to
build oil pressure, before a shutdown will occur. The high
