Product Manual

28 Owner’s Manual for MDG25IF4
Operation
A ground connection is located on the far right of the cam
lock panel. The unit must be connected to a good
earthen ground for proper operating safety. The
generator neutral is bonded to ground when it is shipped
from the factory. The bonding plate must be removed
when the generator is used as a standby power source.
Installation should be in compliance with the National
Electrical Code (NEC), state, and local regulations.
Using the Voltage Selector
Switch
1. Shut down the unit according to Shutting Down
the Unit.
2. Remove padlock from voltage selector switch
lockout device.
3. Move voltage selector switch to desired voltage.
4. Replace and lock padlock on voltage selector
switch lockout device.
5. Start the unit according to Manually Starting the
Unit or AUTO (Remote) Starting the Unit.
Fine Voltage Adjustment
See Voltage Adjust Screen for information on screen
display.
Figure 3-9. Voltage Adjust Screen
1. With the unit running, press .
2. Press . The voltages displayed will flash.
3. Use ▲ and ▼ to adjust the voltage.
4. Press  to confirm the new voltage. The voltages
displayed will stop flashing.
Voltage Regulator
The automatic voltage regulator controls the output of the
generator by regulating the current into the exciter field.
The voltage regulator is adjusted before shipment from
the factory. The regulator has four screwdriver adjustable
potentiometers that may be adjusted for under frequency
roll-off (U/F), U/F dip (DIP), stability (STAB), and voltage
(VOLT). Contact a GMP ASD for additional information
before attempting to adjust the voltage regulator.
NOTE: For units equipped with a Marathon DVR2000E+
automatic voltage regulator, see the Marathon operating
manual provided with the unit.
Achieving 240V Three-Phase in
208V Three-Phase (Parallel Low
Wye) Configuration
IMPORTANT NOTE: Using this method to achieve
240V 3Φ will result in a line to neutral voltage of 139V,
and is not recommended for single phase usage.
Proceed as follows to check which version of the
PowerZone controller application the unit has:
1. With the unit shut down, set the control power
switch to the ON (I) position. The controller will
toggle automatically to the home screen after
initialization.
2. Press ▲, ►, ▼, or ◄ to enter the maintenance
screens.
3. Press ► until the status tab is selected. This tab
will display which version of the PowerZone
application the unit has.
NOTE: The version is also displayed in the top left
corner of the Configuration menu. See Accessing the
Configuration Menu.
(000157)
DANGER
Electrocution. Do not disable or modify the
connection box door safety switch. Doing so
will result in death or serious injury.
WARNING
Electric Shock. Never change the voltage
selector switch while the engine is running or
the controller is on. Doing so could result in
death, serious injury or equipment
damage.
(000302)
Manual Mode
GEN
V
+
-
Voltage Adjust
- Press , voltage will begin flashing
- Use and arrows to adjust voltage
- Press to confirm new voltage. Numbers will stop flashing
V
L-N Average
L-L Average
V
277
480
002803
V
+
-
WARNING
Electric Shock. Never change the voltage
selector switch while the engine is running or
the controller is on. Doing so could result in
death, serious injury or equipment
damage.
(000302)
CAUTION
(000303)
Equipment Damage. Verify voltage application before
making changes to factory settings. Incorrect voltage
applied to a load could result in equipment damage.