Generac Power Systems R-200A User Manual

 

 

5

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)

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

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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:

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.

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.

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.

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.

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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