Emergency Stop Switch; Main Circuit Breaker; Voltage Regulation - Magnum MMG 125 Operating Manual

EMERGENCY STOP SWITCH

The generator is equipped with one emergency stop switch, located on the right rear
corner of the unit next to the control door. The switch is clearly labeled "EMERGENCY
STOP" and is red in color. The switch can be accessed and activated with all doors
closed and locked.
Activate the emergency stop switch by pushing the red button in until it locks down. This
will trip the main circuit breaker which will open the contact disconnecting the load to the
connection lugs. This will also open the fuel circuit, shutting down the engine. The
Emergency Stop fault will be displayed on the control panel.
The switch will remain closed until it is pulled out.
Use the EMERGENCY STOP switch only when the generator must be shut down immediately.
For any other shut down, follow the detailed procedure on page 22.

MAIN CIRCUIT BREAKER

The main circuit breaker is located on the main control panel. When the breaker is in the off "O" position, power is
interrupted between the customer connection lugs and the generator. Once the connections have been made to
the connection lugs and the generator has been started and allowed to reach normal operating temperature, the
breaker may be switched to the on "I" position. Use the breaker handle extension supplied with this unit to apply
additional leverage to the switch.
The main circuit breaker will be tripped, disconnecting power to the connection lugs, if
any of the following items occur while the unit is running:
1. Overload of the generator circuits to the connection lugs.
2. The door covering the customer connection lugs is opened.
3. If the emergency stop switch is activated.
4. If the door to the reconnect box (link board) is removed.
Make sure that any problems that cause the main circuit breaker to trip are corrected
before returning the switch to the on "I" position.
The main circuit breaker interrupts power to the customer connection lugs only.
The customer convenience outlets have power even if the main circuit breaker is in the
OFF "O" position.

VOLTAGE REGULATION

The electronic voltage regulator controls the output of the generator by regulating the current into the exciter field.
The regulator has three screwdriver adjustable potentiometers that may be adjusted for voltage, stability and under
frequency (U/F). The voltage regulator on your unit is adjusted before shipment from the factory. Contact Magnum
Products LLC for additional information before attempting to adjust the voltage regulator.
NOTICE
WARNING
To disconnect power to the convenience outlets, use the individual circuit
breakers located near each outlet.
ON/I ON/I
OFF/O
OFF/O
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