Installation and maintenance
R250
A.V.R.
4067 en - 2009.05 / b
LEROY-SOMER
9
3.3 - Electrical faults
Warning: after setting-up or trouble-
shooting, replace all access panels or
covers.
Fault
Action
Effect
Check/cause
No voltage at
no load on
start-up
Connect a new battery
of 4 to 12 volts to
terminals E- and E+
respecting the polarity
for 2 to 3 seconds
The alternator starts up and its
voltage is still correct when the
battery is removed.
- Lack of residual magnetism
The alternator starts up but its
voltage does not reach the rated
value when the battery is
removed.
- Check the connection of the voltage
reference to the A.V.R.
- Faulty diodes
- Induced short circuit
The alternator starts up but its
voltage disappears when the
battery is removed
- Faulty A.V.R.
- Exciter field short-circuited
- Short-circuit in the main field. Check the
resistance
Voltage too
low
Check the drive speed
Correct speed
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
Speed too low
Increase the drive speed
(Do not touch the A.V.R. pot (P1) before
returning to the correct speed.)
Voltage too
high
Adjust A.V.R.
potentiometer
Adjustment ineffective
- Faulty A.V.R.
- 1 faulty diode
Voltage
oscillations
Adjust A.V.R. stability
potentiometer
- 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)
Voltage
correct at no
load and too
low when on
load (*)
Run at no load and
check the voltage
between E+ and E- on
the A.V.R.
- 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
(*) 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
disappears
during
operation
Check the A.V.R., the
surge suppressor, the
rotating diodes and
replace any defective
components
The voltage does not return to the
rated value
- Exciter winding open circuit
- Faulty induced excitation
- Faulty A.V.R.
- Main field open circuit or short-circuited
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Summary of Contents for R570U
Page 1: ...User and maintenance manual for generating sets R570U 33504081501NE_1_1 ...
Page 15: ...Alternator Cabinet Figure 1 3 Examples of identification plates 13 297 ...
Page 18: ...Sockets voltage 208 120V 16 297 ...
Page 125: ...9 Appendix 9 1 Appendix A Engine user and maintenance manual 123 297 ...
Page 126: ...124 297 ...
Page 128: ...126 297 ...
Page 129: ...OPERATOR S MANUAL Generating set and industrial engines 16 liter EMS 2 127 297 ...
Page 159: ...157 297 ...
Page 218: ...216 297 ...
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Page 222: ...7748681 English 12 2011 220 297 ...
Page 223: ...9 2 Appendix B Alternator user and maintenance manual 221 297 ...
Page 224: ...222 297 ...
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Page 250: ...www leroy somer com 248 297 ...
Page 261: ...Installation and maintenance R250 A V R 4067 en 2009 05 b LEROY SOMER 11 259 297 ...
Page 281: ...2012 03 e LEROY SOMER 19 Installation and maintenance R 450 AVRs 4531 en 279 297 ...
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