Generac Power Systems Digital Controller R-200A Technical Manual: Generator Operation; Engine Timing; Utility Failure; Manual Mode

Generac power systems digital controller technical manual.
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GENERATOR OPERATION

The R-200A controller monitors the front panel
switch position and reads the DIP switch position set-
tings when the control board is initially powered-up.
In the OFF position the controller will only be incre-
menting the exercise timer and monitoring the bat-
tery voltage and low fuel pressure sensor.
In the MANUAL position the controller will start and
run the generator.
In the AUTO position the controller will go into a
"standby" mode, where the controller will monitor
the utility voltage and the exercise timer, and deter-
mine if the generator needs to be started and the load
transferred.
Battery voltage is continuously monitored and a
warning LED is lit if the battery voltage drops below
approximately 12.2 volts for longer than one (1) min-
ute. The LED will turn off when the battery voltage
goes back above approximately 12.5 volts.
If, however, the battery voltage drops below 6V during
cranking the low battery LED will stay lit.
While starting and running the engine, the controller
will monitor the engine condition and shut the engine
down on;
Over Crank
Over Speed
High Coolant Temperature
Low Coolant Level
Low Oil Pressure
Engine Speed Signal Loss/RPM Sensor Loss (the
overspeed LED flashes to indicate this fault)
Dead Battery (battery voltage < 6V during crank-
ing)
ENGINE TIMING
Nominal engine timing when Natural Gas (NG) fuel
is selected is:
1.6L engine is 34 degrees BTDC at 3600 rpm; 28
degrees BTDC at 1800 rpm
2.4L engine is 30 degrees BTDC
4.2L engine is 15 degrees BTDC
Nominal engine timing when LP fuel is selected is:
1.6L engine is 22 degrees BTDC at 3600 rpm; 20
degrees BTDC at 1800 rpm
2.4L engine is 21 degrees BTDC
4.2L engine is 15 degrees BTDC
General Information
R-panel Technical Manual
UTILITY FAILURE
When the utility fails, a 15 second timer will start.
If the utility is still gone when the timer expires the
engine will crank and start. Once started a 10 sec-
ond engine warm-up timer will be initiated. When
the warm-up timer expires, the R-200A controller
will transfer the load to the generator (ATS Mode).
The transfer of load when the generator is running is
dependent upon the operating conditions as follows:
MANUAL MODE
The unit will not transfer if the utility is present, it
will un-transfer if the utility voltage is above 80% of
nominal for > 15 seconds and will re-transfer if the
utility voltage drops below 60% of nominal for >15
seconds.
AUTO MODE
The engine will run if the utility fails for >15 sec-
onds, will not transfer if the utility is present, will
un-transfer if the utility is above 80% of nominal for
>15 seconds, and will stop the engine after a one 1
minute cool-down time.
EXERCISE MODE
The unit will not exercise if the generator is already
running (in manual or auto mode). The generator
will only transfer if the utility fails during the exer-
cise period for >15 seconds, and the switch is in the
AUTO mode above.
UTILITY RESTORED
When the utility returns, a 15 second timer will start.
At the completion of this time, if the utility supply has
been above 80% of nominal voltage for the previous
15 seconds, the control will transfer the load back to
the utility. When the load is transferred a one (1) min-
ute cool down timer will start, after which the engine
will be shutdown.
INITIAL CRANKING
The initial crank cycle will be a 15 second crank fol-
lowed by a seven (7) second rest. This will be followed
by 5 additional cycles of seven (7) second cranks fol-
lowed by seven (7) second rests. If the engine still
fails to start, the overcrank LED will be illuminated.
Based on the above, the maximum number of engine
crank events is six (6), which is approximately 90
seconds, prior to illuminating the overcrank LED.
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