For 2F And 3F; Checking The Alternator Using A Separate Excitation; Replacing The Regulator With A Spare Voltage Regulator - Leroy-Somer R452 Installation And Maintenance Manual

LEROY-SOMER
5.3.2 - for the 2F and 3F
Symptoms
Incorrect PF regulation, PF
potentiometer has no
effect.
PF range incorrect.
The LEDs will not light up.
Cannot adjust the voltage
match circuit.

5.3.3 - checking the alternator using a separate excitation

- The alternator is tested at no load.
- Disconnect the R 452, R 726 and the entire alternator excitation system.
- Connect a 24V 5A variable DC supply to the exciter field wires.
Apply a direct current to the exciter to obtain the rated voltage.
- Check all the alternator parameters:
Stator voltage, exciter field voltage, AREP or regulator power transformer voltages, sensing voltage at the regulator terminal
block.
- All these parameters should be checked against the alternator characteristics.

5.4 - replacing the regulator with a spare voltage regulator

- Set the potentiometers and the jumpers in the same way as the original regulator.
22
INSTALLATION AND MAINTENANCE
VOLTAGE REGULATOR R452
T
ROUBLESHOOTING
Probable causes
- Vectorial composition fault between the sensing
voltage and the stator current.
- Faulty R 726.
- R 726 ST2 jumper missing.
- Wiring fault between the R 452 and the R 726.
- Incorrect setting of P2 and P4 potentiometers.
- Contacts 2F and 3F missing.
- The sensing voltage is incorrect or incorrectly
connected.
Ref. 3563 GB - 4.33 / a - 01.02
Solutions
- Check the sensing wiring and the parallel
operation CT wiring.
- Change the module.
- Check the wiring, in particular the wires
between 1 and 2 of terminal block J1 on the
R 726.
- Reset the range as shown above.
- Check the wiring.
- Check the wiring and the voltage value.