5-5
Diagnostics and Fault Finding
514C Product Manual
PROBLEM
POSSIBLE CAUSE
REMEDY
Motor Runs but stops
after a period with
"Overcurrent Trip"
LED 3 Illuminated.
Overcurrent.
Check Motor wiring and Motor for
earth faults.
Check controller for Faulty Thyristor
Devices.
Motor Runs but stops
after a period
indicating Controller
Motor Overtemperature
trip from Motor
Microtherm.
Check cooling Fan if used. Fan
rotation may be reversed giving airflow
but insufficient for adequate cooling.
Unhealthy.
Check Cooling path.
Motor runs at Full
Speed only
Tachogenerator
Feedback. Incorrect
Tachogenerator Polarity
or Open Circuit
Tachogenerator
Check Tachogenerator viability and
connectivity.
Check Speed Feedback Calibration
Switches.
Check Max Speed Calibrate
Potentiometer P10.
Armature Voltage
Feedback.
Check Speed Feedback Calibration
Switches.
Check Max Speed Calibrate
Potentiometer P10.
Open Circuit Speed
Setpoint Potentiometer
Check Terminal 13 or 10 as
appropriate
Motor runs with Zero
Setpoint.
Zero Speed Offset
Adjustment
Adjust P11 to give Zero Speed
Motor Speed
unstable at Constant
Stability Adjustment.
See General Running performance
adjustments Chapter 4.
Speed Setpoint.
Current Stability
Adjust Current Loop Stability
Potentiometers P6 & P7.
Speed Stability
Adjust Speed Loop Stability
Potentiometers P3 & P4.
IR Compensation.
No IR compensation for
Tachogenerator Feedback. Reduce P8
for Armature Voltage Feedback
Drive does not
produce required
current.
Drive incorrectly
calibrated.
Set SW2, SW3, SW4 to correct
calibration current.
Current calibration set
incorrectly.
The maximum current that the drive
can produce is its rated current.
Setting the calibration above this can
cause damage.
Settings above 39.9Amps will cause
erroneous calibration values.
DO NOT CALIBRATE THE DRIVE
ABOVE RATED CURRENT.
Current Limit set wrongly. Check the current limit diagnostic 23
and the main current limit diagnostic
24. Adjust P5 and external current
limit pot (if used).
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