Parker 514C Product Manual page 38

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