Operation Manual

MARATHON SE350 VOLTAGE REGULATOR
START-UP PROCEDURE:
Ensure the voltage regulator is correctly connected to the generator. Refer to the specific connection
diagram supplied with the generator. Set the regulator voltage adjust to full counter-clockwise
(minimum voltage level). Set the stability control full clockwise (maximum stability level). Connect the
positive lead of a 100V DC voltmeter to F1 and the negative lead of the voltmeter to F2 or use an
appropriate AC voltmeter on the generator output leads.
Start and run the generator at no load and rated speed. The generator voltage should build up to a
minimum level. (Actual level is dependent upon connection). If it does not build up, refer to field
flashing section in generator manual. Slowly adjust the voltage control until the generator voltage
reaches the normal value. Turn the stability adjust counter-clockwise until instability is shown on the
voltmeter. With the system operating in an unstable condition, slowly adjust the stability control
clockwise until generator stability is reached. Interrupt regulator power for a short time (approximately
1-2 seconds). If the generator remains stable no further adjustment is necessary. If the generator does not
remain stable increase the stability slightly and interrupt regulator power again. Repeat this procedure
until system stability is reached and maintained.
TROUBLESHOOTING
SYMPTOM CAUSE ACTION
Residual Voltage
No Output
Residual Voltage at regulator power
input wires 3&4 below 10V AC.
Acceleration time to rated speed too long.
Field leads F1, F2 not connected.
Power input leads not connected.
Blown or missing fuse.
Defective regulator.
Defective generator.
Check wiring diagram for proper
connections.
Flash generator field.
Reduce acceleration time.
Interrupt power input to regulator after
achieving rated speed.
Connect field leads F1, F2.
Connect power input leads 3,4.
Replace fuse.
Replace regulator.
Consult generator manual.
Output Voltage Low Incorrect connections.
Voltage adjust turned down.
Defective regulator.
Check wiring diagram for proper
connections.
Rotate voltage adjust CW until desired
voltage is reached.
Replace regulator.
Output Voltage High Voltage adjust turned too high. Rotate voltage adjust CCW until desired
voltage is reached.
Output Voltage High
No Adjustment
Defective regulator. Replace regulator.
Generator Output
Voltage Hunting
Stability adjust not set properly. Rotate the stability adjust in a CW
direction until hunting stops.
Poor Regulation Defective regulator. Replace regulator.
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