Magnum MMG25FHI Operating Manual - page 28
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9. Should the engine not start and run within three starting cycles, the LCD window will show “SD Start fail”. The
starting sequence may be repeated after the starter has had a minimum of two minutes to cool. Press the “FAULT
RESET” button to clear the controller. To start the unit, press the green “ENGINE START” button.
Note: The engine controller may skip the preheat engine steps on some of the larger models.
10. Once the engine starts it will immediately begin speeding up to a constant 1800 rpm. The engine may hunt or
change speeds until operating speed is reached. After a few minutes of operation, the engine will be warmed
up and the LCD window will show engine and generator operating parameters. Temperature will be shown as
“0” until the engine temperature is approximately 100° F.
11. Check the generator for excessive noise or vibration and any coolant, oil or fuel leaks before applying any loads.
12. Check that the AC output voltage is correct. The output voltage can be fine adjusted by using the fine voltage
adjustment screw (rheostat), as described on page 21.
13. Check that the frequency (Hz) is correct. With no loads connected to the generator, the frequency should read
approximately 60 Hz, depending on the type of engine governing used.
14. If all wiring connections have been made correctly, switch the main circuit breaker to the “ON / I” position and
then add any loads attached to the convenience outlets by switching the respective circuit breaker to the “ON /
I” position. You will notice a slight change in engine sound when a load is applied to the unit.
“AUTO” (REMOTE) STARTING OF THE GENERATOR
The “AUTO” button is used when the generator is started from a location other than the control panel and by using
a transfer switch. “AUTO” (remote start) is the normal setting when the generator is being used as a standby power
supply. Before putting the generator in the “AUTO” mode, review the Pre-Start Check List and Manual Starting of the
Generator sections beginning on page 26. Also follow all safety warnings and information on isolating the generator
with a transfer switch if the unit is to be used as a standby power supply (see page 40). Then continue with the steps
described below:
1. Perform a manual start of the generator at least once to verify that the engine is operating correctly.
2. If a check of the remote start circuit is desired, remove the wires from the remote start terminal block.
Press the “AUTO” button, the Liquid Crystal Display (LCD) window should highlight “AUTO” in the upper
left corner. Attach a jumper wire (minimum 16 gauge) across the two terminals on the remote start
terminal block. This applies a ground to the Magnum Digital Controller (MDC) to close the starting circuit
contacts. The engine should crank, start and run.
3. Remove the jumper wire from the remote start terminal block and the engine will stop. Reconnect any
necessary wires from the remote start switch (transfer switch) to the remote start terminal block.
4. Confirm unit is in “AUTO” mode. The LCD window should have “AUT” highlighted in the upper left corner.
5. Close the main circuit breaker (set to “ON / I”).
6. Secure the generator by closing and locking all access doors.
7. The generator is now ready for remote starting.
SHUTTING DOWN THE GENERATOR
Check with personnel using power supplied by the generator and let them know that the power is going to be turned
off. Make sure the power shut down will not create any hazards by accidentally turning off equipment that needs to
be kept on (pumps, compressors, lights, etc.).
1. Remove all loads from the generator by opening all circuit breakers (turn to OFF / “O”).
2. Let the engine run for approximately five minutes to allow it to cool down.
3. Push the red “ENGINE STOP” button. Pressing “Engine Stop” will result in the generator going into the
shut down cycle and starting a 15 second shut down timer called “Stop Value.” If the unit does not shut
down within 15 seconds a “Stop Fail” alarm will be displayed on the Liquid Crystal Display (LCD) window.
4. Move the “CONTROL ON/OFF” toggle switch to the “CONTROL OFF / O” position.