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8. TROUBLE SHOOTING
DANGER!
The AVR is NOT insulated from the power supply and from field circuit.
The maintenance operations MUST be done ONLY when the AVR is disconnected and the
protection devices are mounted and/or activated.
Disconnect the AVR in case of High Voltage Test on the alternator windings.
8.1 First Inspection
When the system is shut-down, check the fastening of fast-on terminals on the AVR. Generally, check all connections to avoid loose
contact.
8.2 Trouble shooting
The following instructions are supposed to help to find out the fault location within the whole excitation system. However, it is not
possible to deal with all eventualities.
List of Possible Faults
Machine is not exciting
Checks, action
• Field circuit interrupted
• Check connection wiring
• Measure power supply Aux - Com
• Check for tripped protective circuit-breaker
• Check the built-in fuse
• Check operating mode
• Check programmable digital input setting and connection
• Set point error
• Check set point
• No electronics supply
Overvoltage during start-up
• Measure the Generator voltage directly on the voltage sensing input
• Check configuration
• Check set point
• Overvoltage caused by voltage regulator
• Check overvoltage threshold
• Check regulator settings
Unstable Output Voltage in no-load operation
• Check operating mode
• Check programmable digital input setting and connection
• Check set point
• Regulator error
• Set point error
• Control element fault
• Check parameters of voltage regulator
• Check/adjust stability settings r.350 and r.351
• Unstable Increase/Decrease inputs
• Unstable External analog input
• Check wiring for loose contacts, check input voltages, check field
BELTRAME
CENTRO SERVIZI ENERGIA
Summary of Contents for S2014
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