Diagnostics and Fault Finding
5-4
514C Product Manual
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
REMEDY
"Power On" LED 1
Not Illuminated
No Auxiliary Supply
Available.
Check Auxiliary Supply Availability. Is the
Supply Fuse fitted or the Circuit Breaker
closed
?
Auxiliary Supply Fuse. Supply fuse blown. Investigate Contactor
connections or Transformer Tapping Switch
position.
Incorrect Supply
Voltage Applied to
Controller.
Check that the Supply Voltage is compatible
with the Transformer Tapping Switch
position.
Illuminated but drive
does not operate.
Incorrect Auxiliary
Supply Switch Setting.
Correct Auxiliary Supply Switch Setting.
Controller “Trips”
Immediately after
Drive Run command.
Microtherm not wired. Connect Microtherm to terminals T22 and
T11 or if Microtherm not available link T22
to T11.
“PLL LOCK” LED 4
not illuminated after
Drive Run command.
Main Power Supply
not present.
1) Main Contactor not Energised. Check Run
Command & Contactor wiring.
2) Is the Supply Fuse fitted or the Circuit
Breaker closed
?
Motor will not turn
after Drive Run
Enable Signal not
present.
Check Control Circuit Wiring.
Command.
No Speed Setpoint.
Check Total Setpoint terminal T12. Check
Setpoint Pot'meter & Wiring.
If using the Setpoint Ramp Input T13 check
SW1/6 is OFF.
No Armature Current. Check P5 adjustment & External Current
Limit Potentiometer setting & wiring (if used).
No Field.
Check Field AC Supply and Field
connections.
Motor Jammed.
Free Obstruction.
Motor Runs with
“Current Limit”
LED5 illuminated
Incorrect Current Limit
Setting.
Check P5 setting.
Check External Current limit setting & wiring
if used.
and Stops after short
period with "Stall"
Incorrect Current
Calibration.
Check Current Calibration Switches SW2, 3
& 4.
LED2 Illuminated
Motor Jammed.
Free Obstruction.
Motor Runs and
Stops after short
Maximum Controller
Output Exceeded
Check compatibility of Motor Voltage to
Controller Output Voltage.
period with "Stall"
LED2 Illuminated
Incorrect Feedback
Voltage Calibration
Check Feedback Voltage Calibration
Switches SW1/1 & SW1/2. Note these
Switches must be set for both
Tachogenerator & Armature Voltage
Feedback.
Faulty Tachogenerator
and/or Coupling.
Check Tachogenerator (use Armature
Voltage Feedback Temporarily).
