OPERATION
Page
74
Copyright Trace Engineering Company, Inc.
5916 - 195th Street N.E.
Arlington, WA 98223
Telephone: 360/435-8826
Fax: 360/435-2229
www.traceengineering.com
PS Series Inverter/Charger
Part No. 3597
Rev. D: November 23, 1999
(4) Time (Exercise Period Days): The generator is automatically started at a pre-selected time
whenever it exceeds a set number of days without running. Once the start command is initiated,
the generator starts and runs for 15 minutes to ensure that it remains fully operational and that
the generator’s starting battery is maintained at an optimal state of charge. To set generator start
time, go to END QUIET TIME under the GENERATOR TIMER menu. To set the number of days
between exercise periods, go to SET EXERCISE PERIOD DAYS under the GEN AUTO START
SETUP menu. If the value is set to 10, the generator will start every tenth day of continuous non-
operation. To disable this feature, set the value to zero.
GENERATOR STARTING AND STOPPING CONFIGURATIONS
Two different generator start routines are available to allow use with a variety of generator types. The
sequence of closing and opening of the RY7 relay, on the GEN RELAY MODULE, changes depending
upon what position the underlining cursor is in from the SET RY7 FUNCTION menu item under the GEN
STARTING DETAILS (13) menu item. The choices are GLOWSTOP or RUN.
When RUN is selected as the function of the RY7 relay, the RY7 COM and RY7 N.O. contacts remain
closed while the generator is running. This is usually wired to the ignition system of the generator engine
and/or a fuel solenoid valve. The normally closed contacts of this relay are also available on the terminal
block, marked RY7 N.C. The normally closed contact is open (not connected to the common terminal)
while the generator is running. When the generator is off, the RY7 N.C. terminal is connected to the RY7
COM terminal. This configuration is useful for starting many HONDA brand generators as well as some
others. This should also be used to select when the RY7 COM and RY7 N.O. contacts are used to control
a two wire (auto crank) type generator.
When GLOWSTOP is selected as the function of the RY7 relay, the RY7 COM and RY7 N.O. contacts
remain open while the generator is running. The contacts close only when it is time for the generator to be
stopped. This is useful for generators that require a stop signal to shut down the generator. The
GLOWSTOP configuration is useful for starting ONAN brand generators. The GLOWSTOP setting can
also be used for diesel generators. The RY7 COM and RY7 N.O. contacts will be closed during the PRE
CRANK SECONDS period. This relay can be used to provide both the GLOW and STOP signals. When
this is done the generator will be given both GLOW and STOP signals before cranking and when
stopping. This is done on many diesel generators by their own starting systems. You should also check
that the control system also powers the glow plugs during the cranking signal - the generator
manufacturer or dealer can provide more information.
The terminals marked RY8 COM and RY8 N.O. provide contacts that remain closed only during generator
cranking period. This is usually wired to the starter solenoid (relay) of the generator engine. This relay
closes after an initial PRE CRANK delay period (the default MAX CRANKING SECONDS period is 10
seconds). Relay RY8 will open after a half-second delay, once the inverter senses an AC voltage above
80 VAC on the AC INPUT terminals (the ‘MAXIMUM AC AMPS IN’ switch must be in the AC2 position). If
the voltage remains for the POST CRANK period, relay RY8 will remain open. If the generator doesn’t
start it will close again after a POST CRANK delay period. The inverter will attempt to start the generator
up to 5 times (the number of times the inverter tries to start the generator is fixed at 5 attempts). If the
required voltage level is not reached, relay RY7 opens (in RUN mode) to “kill” the generator before a
restart is attempted. This reduces the chance that the starter motor will be engaged on a spinning
generator engine. This protection is inherent in the GLOWSTOP mode.
The generator will be stopped when the battery charger has kept the temperature compensated battery
voltage near the BULK VOLTS DC setting for the ABSORPTION TIME period. When it is time to stop the
generator, relay RY7 will open or close (depending on which RY7 FUNCTION is selected), stopping the
generator. This will occur after a 40 second cool down period. If the generator does not stop, the inverter
will continue to charge the battery at the FLOAT VOLTS DC.
The transfer from generator to inverter will be less noticeable if you manually turn off the generator from
the SWRC instead of from the generators off switch. This allows the inverter to first disconnect the
generator before it is turned off, reducing problems with voltage sags during the transition.
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