SDMO R44C3 User Manual

11
2010.10 / i
LeRoY-SoMeR
4.4 - Mechanical defects
Fault Action
Bearing
Excessive overheating of one or both
bearings (temperature > 80 °C on the
bearing retainers with or without abnormal
noise)
- If the bearing has turned blue or if the grease has turned black, change the
bearing.
- Bearing not properly seated.
- End shields misaligned (anges not properly tted).
Temperature
abnormal
Excessive overheating of alternator frame
(more than 40 °C above the ambient
temperature)
- Air ow (intake-outlet) partially clogged or hot air is being recycled from
the alternator or engine
- Alternator operating at too high a voltage (> 105% of Un on load)
- Alternator overloaded
Vibration
Excessive vibration
- Misalignment (coupling)
- Defective mounting or play in coupling
- Rotor balancing fault
Excessive vibration and humming noise
coming from the machine
- Alternator operating in single-phase mode (single-phase load or faulty
contactor or installation fault)
- Stator short-circuit
Abnormal noise
Alternator damaged by a signicant impact,
followed by humming and vibration
- System short-circuit
- Mis-paralleling
Possible consequences
- Broken or damaged coupling
- Broken or bent shaft end
- Shifting and short-circuit of main eld
- Fan fractured or coming loose on shaft
- Irreparable damage to rotating diodes or AVR
4.5 - Electrical faults
Fault Action Effect Check/Cause
No
voltage
at no load
on start-up
Connect between E- and
E+ a new battery of 4 to
12 volts, respecting
the AVR polarities, for
2 to 3 seconds
The alternator builds up and its voltage is
still correct when the battery is removed.
- Lack of residual magnetism
The alternator builds up but its voltage
does not reach the rated value when
the battery is removed.
- Check the connection of the voltage reference to the
AVR
- Faulty diodes
- Armature short-circuit
The alternator builds up but its voltage
disappears when the battery is removed
- Faulty AVR
- Field windings disconnected
- Main eld winding open circuit. Check the resistance
Voltage too low Check the drive speed
Correct speed
Check the AVR connections (AVR may be faulty)
- Field windings short-circuited
- Rotating diodes burnt out
- Main eld winding short-circuited - Check the
resistance
Speed too low
Increase the drive speed
(Do not touch the AVR voltage pot. (P2) before running
at the correct speed.)
Voltage too high Adjust AVR voltage
potentiometer
Adjustment ineffective Faulty AVR
Voltage
oscillations
Adjust AVR stability
potentiometer
If no effect: try normal/rapid recovery
modes (ST2)
- Check the speed: possibility of cyclic irregularity
- Loose connections
- Faulty AVR
- Speed too low when on load (or LAM 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 AVR
Voltage between E+ and E-
SHUNT < 20 V - AREP/PMG < 10 V - Check the speed (or LAM set too high)
Voltage between E+ and E-
SHUNT > 30 V - AREP/PMG > 15 V
- Faulty rotating diodes
- Short-circuit in the main eld. Check the resistance
- Faulty exciter armature
(*) Caution: For single-phase operation, check that the sensing wires coming from the AVR are correctly connected to the operating terminals
Voltage
disappears
during operation
(**)
Check the AVR, 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 exciter armature
- Faulty AVR
- Main eld open circuit or short-circuited
(**) Caution: Internal protection may be activated (overload, open circuit, short-circuit)
INSTALLATION AND MAINTENANCE
LSA 43.2 / 44.2 - 4-poLe
ALTeRNAToRS
3434 en -
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SDMO R44C3 Specifications

General

Brand	SDMO
Model	R44C3
Category	Inverter
Language	English