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GCU-3000 23
Module appears over voltage
or under voltage warning
during operation
• Check AC voltage
• Check over voltage and under voltage setting
• Check for AC open circuit
• Check AC power input protection fuse (F1,
F2, F3)
• Change AVR
• Correct internal setting
• Correct error
• Change fuse
Module appears over speed
or under speed warning
during operation
• Check governor and actuator operation
• Check MPU operation
• Check AC power input protection fuse (F1,
F2, F3)
• Check 50/60 Hz RPM setting
• Check over speed or under speed setting
• Change governor or actuator
• Change MPU
• Change fuse
• Correct internal setting
• Correct internal setting
can not shut off successfully
when switching to OFF
during operation
• Check cool down setting if over delayed
• Check stop timer setting if too short
• Check if energize to start and energize to
stop setting
• Check for stop open circuit
• Check governor and fuel solenoid operation
• Correct internal setting
• Correct internal setting
• Correct internal setting
• Correct internal setting
• Change governor or fuel
solenoid
Single phase system Voltage
valued normal, but module
appears under voltage failure
warning
• Check system phase setting (1 Phase or 3
Phase)
• Check under voltage setting
• Check AC power input protection fuse (F1,
F2, F3)
• Correct internal setting
• Correct internal setting
• Change fuse
Contactor can not execute,
under normal operation
• Check idle speed timer setting for over delay
• Check load contactor
• Check wiring for open circuit
• Correct internal setting
• Change load contactor
• Correct error
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