Sincro RD1 - Maintenance and Trouble-Shooting; Preventive Maintenance; Trouble-Shooting

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MAINTENANCE AND TROUBLE-SHOOTING
PREVENTIVE MAINTENANCE
Periodical inspections of the equipment are required to ensure they are clean, dust and moisture
free. It is essential that all terminals and connections are kept free from corrosion.
TROUBLE-SHOOTING
Trouble Possible
causes
Solutions
NO OUTPUT VOLTAGE
- Demagnetized machine
- Wrong connection of the AVR
- Loose terminals/connections
- External potentiometer doesn’t
work (if present)
- Burnt fuse
- Faulty AVR
- Connect (for a while) an external
battery (12Vdc) to the exciter
(respecting the polarities)
- Check as per wiring diagram
- Check if all terminals/connections are
well tightened
- Change external potentiometer (if
present)
- Check and replace
- Replace the AVR
LOW OUTPUT VOLTAGE
- Voltage potentiometer wrongly
adjusted
- Sensing wrongly connected
- Dip-switch wrongly positioned
- Low frequency (under the UF limit)
- Under-Frequency protection is not
properly adjusted
- Faulty AVR
- Check and adjust
- Check the sensing connections
- Check and fix
- Increase the engine speed
- Check and adjust
- Replace the AVR
HIGH OUTPUT VOLTAGE
- Voltage potentiometer wrongly
adjusted
- Sensing wrongly connected
- Dip-switch wrongly positioned
- Missing sensing
- Faulty AVR
- Check and adjust
- Check the sensing connections
- Check and fix
- Check if sensing is interrupted
- Replace the AVR
UNSTABLE VOLTAGE
- Stability response incorrectly
adjusted
- Unstable engine speed
- Loose terminals/connections
- Faulty AVR
- Adjust trimmer “ST”
- Check the frequency/engine speed
- Check if all terminals/connections
are well tightened
- Replace the AVR
FUSE BLOWS
CONTINUOUSLY
- UF protection adjusted for a very
low frequency (so the fuse burn during
the turn-off procedure)
- Faulty AVR
- Adjust UF limit to a value close to
the nominal frequency
- Replace the AVR