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MARATHON SE350 VOLTAGE REGULATOR
WARNING: To prevent personal injury or equipment damage, only a qualified service
technician should install, operate or service this device.
IMPORTANT: DO NOT megger or high-pot the generator while the regulator is
connected. DO NOT high-pot the regulator.
VOLTAGE ADJUST:
A screwdriver adjustable potentiometer adjusts the generator output voltage. Adjustment
clockwise increases the generator output voltage.
STABILITY ADJUST:
System stability is the ability of the generator to respond to load transients. Decreasing
the stability makes the generator less sluggish and faster to respond to load transients. If
the stability of the regulator is decreased too much, the generator will tend to hunt under
steady state conditions. A screwdriver adjustable potentiometer adjusts the system
stability. Adjustment clockwise increases the stability. Increasing the stability increases
the response time of the generator. Conversely, decreasing the stability decreases the
response time of the generator.
V/HZ ROLL-OFF FREQUENCY SELECTION
:
The roll-off point is the frequency where the generator voltage starts to decrease. This
reduces the Kilowatt load to the engine, which allows the engine to recover in speed
under any load transient condition. Use jumper to select 50 Hz or 60 Hz. The screwdriver
adjustable potentiometer sets the roll-off frequency from 54-61 Hz in the 60 Hz setting or
from 45-51 Hz in the 50 Hz setting.
The SE350 has the roll-off point preset to 58 Hz in the 60 Hz mode and 48 Hz in the 50
Hz mode. To change the roll-off point, adjust engine speed to the desired rated speed. (50
or 60 Hz). Set the voltage to the desired setting at rated speed. Adjust engine speed to the
desired roll-off point. Turn the potentiometer counterclockwise until the voltage starts to
drop off. Then adjust the potentiometer clockwise until the voltage returns to rated. Re-
adjust engine speed to rated speed.
23
EXCITER POWER CIRCUIT:
Connect the regulator wire F+ to the generator
F+ or F1 field terminal. Connect the regulator
wire F- to the generator F- or F2 field terminal
SENSING / POWER INPUT CIRCUIT:
Input power and sensing is achieved through
terminals 3 and 4. The voltage input requirement
of the SE350 is 190 to 240V AC.
A 4 Amp 250V – 5x20 mm fuse is supplied with
the re
g
ulator.
50


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