Electrical Faults - Leroy-Somer AVR R250 Installation And Maintenance Manual

LEROY-SOMER

3.3 - Electrical faults

Fault Action
No voltage at Connect a new battery
no load on of 4 to 12 volts to
start-up terminals E- and E+
respecting the polarity
for 2 to 3 seconds
Voltage too Check the drive speed
low
Voltage too Adjust A.V.R.
high potentiometer
Voltage Adjust A.V.R. stability
oscillations potentiometer
Voltage Run at no load and
correct at no check the voltage
load and too between E+ and E- on
low when on the A.V.R.
load (*)
(*) Warning: For single-phase operation, check that the sensing wires coming from the A.V.R. are correctly connected to
the operating terminals (see the alternator manual).
Voltage Check the A.V.R., the
disappears surge suppressor, the
during rotating diodes and
operation replace any defective
components
Installation and maintenance
R250
A.V.R.
Effect
The alternator starts up and its
voltage is still correct when the
battery is removed.
The alternator starts up but its
voltage does not reach the rated
value when the battery is
removed.
The alternator starts up but its
voltage disappears when the
battery is removed
Correct speed
Speed too low
Adjustment ineffective
The voltage does not return to the
rated value.
Warning: after setting-up or trouble-
shooting, replace all access panels or
covers.
4067 en - 11.2006 / a
Check/cause
- Lack of residual magnetism
- Check the connection of the voltage
reference to the A.V.R.
- Faulty diodes
- Induced short circuit
- Faulty A.V.R.
- Exciter field short-circuited
- Short-circuit in the main field. Check the
resistance
Check the A.V.R. connections (A.V.R. may
be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main field winding short-circuited
- Check the resistance
Increase the drive speed
(Do not touch the A.V.R. pot (P1) before
returning to the correct speed.)
- Faulty A.V.R.
- 1 faulty diode
- Check the speed: possibility of cyclic
irregularity
- Loose terminals
- Faulty A.V.R.
- Speed too low on load
(or U/F gradient set too high)
- Check the speed (or U/F gradient set too
high)
- Faulty rotating diodes
- Short-circuit in the main field. Check the
resistance
- Faulty induced excitaion
- Exciter winding open circuit
- Faulty induced excitation
- Faulty A.V.R.
- Main field open circuit or short-circuited
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