Generac Power Systems R-200A Rpm Signal Failure Flashing Red Overspeed Indicator, Alarm Cancel

General Information

R-panel Technical Manual

RPM SIGNAL FAILURE (FLASHING RED OVERSPEED INDICATOR)

If the R-200A controller does not receive a signal from the engine flywheel sensor, the R-200A control- ler cannot maintain the generator output frequency or monitor for an overspeed condition. If this sig- nal is lost the R-200A controller will shut down the engine as follows:

‹RPM SIGNAL FAILURE DURING CRANKING

The engine control board (R-200A controller) will monitor the engine speed signal during engine crank- ing. If the control board does not see a valid signal within the first four seconds of each crank cycle it will stop the crank cycle, lock out on a shut down fault and flash the overspeed LED.

‹RPM SIGNAL FAILURE DURING RUNNING

Running mode is handled differently because there is always the possibility the engine could slow down or stop running due to a temporary overload. To avoid shutting down and latching out on a temporary problem the following is done. If the engine is up and running, and the control board stops receiving a valid engine speed input signal it will respond as follows:

1.It will close the throttle.

2.It will shut down the engine by turning off the fuel supply.

3.It will wait for 15 seconds to ensure the engine has stopped.

4.It will then energize the starter and monitor the engine speed signal.

A.If the control board does not see the engine speed signal it will stop the crank cycle, lock out on fault, and flash the overspeed LED.

B.If the control board does see the engine speed input signal during cranking it will start and run the engine normally. If the engine speed signal is again lost while running it will repeat the above procedure one more time.

C.If the failure should repeat a third time, the con- trol board will shut down the engine, lock out on fault, and flash the over speed LED.

OVERCRANK (RED LED INDICATOR)

Occurs if the engine has not started within the total 90 second crank cycle. This is a latched fault and will shut down the engine.

INVALID DIP SWITCH SETTING (ALL RED LED’S ON)

All five (5) RED LED’s on the front panel will be ON all the time if DIP switch position 5 is not set cor- rectly.

ALARM CANCEL

When the generator is shut down on a latched fault or latching alarm, the AUTO/OFF/MANUAL switch must be set to the OFF position to turn off the correspond- ing fault LED. Prior to moving the switch to the OFF position, record which LEDs are ON or FLASHING and the date on the back cover of this manual.

AUTOMATIC TRANSFER SWITCH (ATS MODE)

When this generator, along with an RTS-type or HS- type automatic transfer switch has been installed and connected, a circuit board in the generator control panel constantly monitors the utility voltage and con- trols the operation of the transfer switch.

To implement this mode of operation, Position 2 of the eight-position DIP switch, which is located on the generator circuit board (see Figures 1 and 2), must be in the OFF position. In ATS Mode utility voltage sensing, weekly exercising, and load transferring is under the control of the generator.

Should the utility voltage drop below a preset value, and remain at this low voltage for a preset amount of time, the generator cranks and starts. After the generator starts, the transfer switch transfers the load circuits to the generator so the generator can power them. When the utility source voltage has been restored, the transfer switch re-transfers the load circuits back to the utility source voltage and the gen- erator shuts down.

The transfer switch is controlled by the generator circuit board via control wires 23 and 194. Wire 23 connects the collector of an NPN transistor on the generator circuit board to the “low side” (Terminal

23)of the transfer relay coil in the transfer switch. Wire 194 connects positive battery voltage from the generator circuit board to the “high side” (Terminal

194)of the transfer relay coil in the transfer switch.

In order for the generator utility voltage sensing function to work, it is necessary to provide a 5 amp fused 240VAC for 240V or 480V systems or 208VAC utility source connection (depending on the generator being used) from the transfer switch main N1 and N2 terminals to the generator wiring panel N1 and N2 terminals (See Figure 4).

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