Service Manual FCD 300
Release 01/2003
15
Revise 08/01/2003 by DD Service Manager, Steffen Sundbæk
11.
Symptom / Causes chart
Symptom/Cause chart is generally directed towards the more experienced technician. The
intent of this chart is to provide a range of possible causes for a specific symptom. In doing
so, this chart provide a direction, but with limited instructions.
Symptom
Possible Causes
LED “ON” is not light
•
Missing power line in
•
Missing 24 V ext. supply
LED “Bus” is flashing
•
Bus communication error
•
Bus address conflict – e.g. dual address
•
Local operation or Local stop
LED “Status” is light
•
Corresponding to parameter setting. For further
information see design guide - parameter number 26
and DeviceNet manual for specific DeviceNet
signalling.
No LED light
•
Incorrect or missing input voltage
•
Incorrect or missing DC Bus voltage
•
Remote control wiring loading the power supply
•
Control card not connected right – check plugs
•
Defective Control Card
•
Defective Interface /ILD Card
•
Defective Relay Card
Blown input line fuses (Shorted
Rectifier module)
•
Shorted IGBT
•
Shorted DC Bus
•
Shorted brake IGBT
•
Mis-wired Dynamic Brake option
Motor operation unstable (Speed
Fluctuating)
•
Start compensation set too high
•
Slip Compensation set too high
•
Improper current feedback
•
PID Regulator or Auxiliary Reference mis-adjusted
•
Control signal noise
Motors draws high current but
cannot start.
(May appear to rock back and
forth)
•
Start voltage too high
•
Open winding in motor
•
Open connection to motor
•
One inverter phase missing. (Test output phase
balance.)
Motor runs unloaded but stalls
when loaded.
(Motor may run rough and VLT
may trip).
•
Current Limit set too low
•
One half of one inverter phase missing. (Test output
phase balance.)
Unbalanced input phase currents
NB:
Slight variations in phase
currents are normal.
Variations greater than 5%
require investigation
•
Input line voltage
•
Faulty connection on input wiring
•
Fault in plant power transformer
•
Input Rectifier module faulty (open diode).
