Control Panel
SEQUENCE OF AUTOMATIC OPERATION
Initial Conditions: Generator in Auto ready to run, load being sup- plied by the Utility Source through the transfer switch.
1.When the utility voltage fails (falls below 60% of nominal), a
2.As soon as the unit starts a 5 second
3.Once the unit is running and the switch has transferred the load to the generator the unit will monitor utility voltage. When utility voltage returns (above the programmable pickup voltage, normally 80% of nominal), a 15 second “Return to Utility” timer will start. At the end of the return to utility time, if the utility voltage is still above the pickup voltage, the unit will transfer the load back to the utility source and run the unit through a one minute cool down period. When the cool down period is over the unit will shut down and be ready for the next outage.
4.If during the cool down period utility voltage should fall below 60% of nominal for the line interrupt delay period, the unit will transfer the load back to the generator and continue to moni- tor the utility.
CRANK CYCLES AND OVERCRANK SHUTDOWN
If the unit fails to start during a cranking period it will display the Overcrank Shutdown Alarm. The system will control the cranking cycles as follows:
The first crank cycle is a 16 second crank time followed by a 7 second rest. The next 5 cycles will be 7 seconds of cranking time each followed by a 7 second rest time.
If the unit fails to start by the end of the 6 crank/rest cycles the Overcrank Shutdown Alarm will display and the unit will not attempt to crank until the alarm is reset.
AUTO START
This unit is designed to automatically start in the event of a util- ity failure or brown out condition. Brown out is defined as utility voltage less than 60% nominal, while utility is considered good when it is restored to at least the pickup value, 80% of nominal. These levels are fixed. The “Line Interrupt period” is an adjustable parameter by the dealer. If
MANUAL START
Allows the user to start and run the generator manually.
Transfer of the load to the generator will occur if utility is lost while the unit is running in the manual mode (only if activated).
ALARM AND WARNING MESSAGES
Alarms are defined as “Latching” which means they must be cleared before the alarm message on the screen will clear. They can be of type “Shutdown” or not and are logged in the alarm log. Alarms are all annunciated on the display).
Warnings are “Non Latching” meaning the message automati- cally clears when the warning condition goes away. Warnings can not be of type “Shutdown” but they are logged in the alarm log. Warnings are all annunciated on the display.
LOW OIL PRESSURE SHUTDOWN ALARM
There is a 10 second delay before oil pressure is monitored.
HIGH COOLANT TEMPERATURE SHUTDOWN ALARM
There is a 10 second delay before engine temperature is moni- tored.
Once running there is a 1/4 second delay before shut down. The limit is set at 125° C or 257° F.
OVERCRANK SHUTDOWN ALARM
Occurs if the engine has not started within the specified crank cycle.
OVERSPEED SHUTDOWN ALARM
Warning indicator is measured and calculated by the microproces- sor. Overspeed is defined as +20% of nominal engine speed for 3 seconds, or +25% immediate.
Nominal engine speed = 60.0 Hz
RPM SENSOR FAILURE SHUTDOWN ALARM
During cranking: If the board does not see a valid RPM signal within four (4) seconds of cranking it will shut down and lock out on RPM sensor loss.
During running: If the RPM signal is lost for one full second the board will shut the engine down, wait 15 seconds, then
If no RPM signal is detected within the first four (4) seconds of cranking, the control board will shut the engine down and latch out on RPM sensor loss.
If the RPM signal is detected the engine will start and run normally. If the RPM signal is subsequently lost the control board will try two more
05/10 A .Rev CntrlNex001
