Troubleshooting Table; For 1F Regulation, Parallel Operation Between Alternators - Leroy-Somer R452 Installation And Maintenance Manual

LEROY-SOMER

5.3 - troubleshooting table

- Before any intervention on the R 452 or the R 726, carefully note the potentiometer and jumper positions.
5.3.1 - for 1F, parallel operation between alternators
Symptoms
Absence of voltage
on start-up, at no load.
Voltage too high and
adjustment potentiometer
has no effect.
Voltage too high, but
adjustable by the
adjustment potentiometer.
Voltage too low, but
adjustable by the voltage
potentiometer.
20
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
T
ROUBLESHOOTING
Probable causes
- No residual magnetism or polarity inversion
between the excitation output and the excitation
input.
- De-energising contacts open.
- The speed is less than the rated speed.
- Connection lost between the regulator and the
exciter.
- Alternator loaded or short-circuited.
- External potentiometer connected incorrectly.
- Faulty regulator.
- Faulty exciter or rotating diode bridge.
- Fuses blown.
- Incorrect voltage at the sensing terminals.
- Loss of sensing.
- The external potentiometer has an incorrect
value.
- Faulty regulator.
- Voltage potentiometer set too high.
- Regulator sensing incorrect.
- Faulty regulator.
- ST3 and ST4 jumpers.
- The speed is too low.
- Exciter and rotating diodes.
Ref. 3563 GB - 4.33 / a - 01.02
Solutions
- Voltage build-up is required.
- Close this contact.
- Adjust the speed.
- Check the wiring.
- Remove the load from the alternator.
- Check the wiring.
- Test it or change it.
- Check the exciter and the diodes.
- Replace the fuses.
- Check the wiring of the 0, 110V, 220V and 380V
terminals on terminal block J1.
- Check the wiring.
- Set a potentiometer with the correct value.
- Test it or change it.
- Adjust voltage potentiometer P2 or the external
potentiometer.
- Check the wiring and the sensing value at the
0V, 110V, 220V and 380V terminals.
- Test it or change it.
- Check the presence of the ST3 and ST4
jumpers.
- Set to the correct speed.
- Check the exciter and the rotating diodes.