Voltage Selector Switch; Emergency Stop Switch - Generac Power Systems MAGNUM MLT4250 Owner's Manual

Operation
B
Figure 3-9. Connecting Generator Output Lugs

Voltage Selector Switch

See Figure 3-10. The
mechanically changes the connections between the
generator output leads and the connection lugs on the
main control panel. Voltage ranges are selected by
rotating the handle on the switch to the desired voltage.
IMPORTANT NOTE: NEVER change the voltage selec-
tor switch while the engine is running or the controller is
on. If the engine is running or starts while the setting is
changed, severe arcing will occur causing damage to the
switch and generator windings.
The voltage selector switch is equipped with a lockout
mechanism. Once the proper voltage has been selected,
insert a padlock through the lockout hole(s). By locking
the handle in place, unauthorized changing of the voltage
setting is prevented.
20
A
004529
voltage selector switch
277/480V 3-PHASE
120/
208V
277/
480V
Switch styles vary by model.
= Not recommended for normal use
120/208V 3-PHASE
120/
208V
120/
277/
240V
480V
Switch styles vary by model.
120/240V 3-PHASE
120/ 120/
208V 240V 3PH
277/ 120/
480V 240V
1PH
Switch styles vary by model.
4 Position Voltage Selector Switch Option
= Not recommended for normal use
120/240V 1-PHASE
120/
208V
120/
240V
Switch styles vary by model.
Figure 3-10. Selecting Voltage

Emergency Stop Switch

The unit is equipped with one emergency stop switch.
For location of the emergency stop switch, refer to
Component Locations. The red switch is clearly labeled
EMERGENCY STOP. 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 switch will remain closed until it is pulled out.
Figure 3-11. Emergency Stop Switch
NOTE: Use the emergency stop switch only when the
unit must be shut down immediately. For any other shut
down, refer to Shutting Down the
Owner's Manual for MLT Light Tower
L1-L2 = 480V L1-N = 277V N =
L2-L3 = 480V L2-N = 277V
L3-L1 = 480V L3-N = 277V
VOLTAGES AT RECEPTACLES
RECEPTACLE L-L L-N
GFCI - 139V
GFCI w/Buck - 120V
Twist-locks 240V 139V
002810
L1-L2 = 208V L1-N = 120V N =
L2-L3 = 208V L2-N = 120V
L3-L1 = 208V L3-N = 120V
VOLTAGES AT RECEPTACLES
RECEPTACLE L-L L-N
GFCI - 120V
GFCI w/Buck - 120V
Twist-locks 208V 120V
002809
L1-L2 = 240V L1-N = 120V N =
L2-L3 = 240V L2-N = 208V
L3-L1 = 240V L3-N = 120V
VOLTAGES AT RECEPTACLES
RECEPTACLE L-L L-N
GFCI - 120V
GFCI w/Buck - 120V
Twist-locks 120V 0/120V
002811
002811
L1-L2 = - L1-N = 120V N =
L2-L3 = - L2-N = -
L3-L1 = 240V L3-N = 120V
VOLTAGES AT RECEPTACLES
RECEPTACLE L-L L-N
GFCI - 120V
GFCI w/Buck - 120V
Twist-locks 240V 120V
002812
002393
Unit.