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TD Series Digital Solid State Soft Starter 48 - 1250A
Chapter 8 - Troubleshooting
8.1 Failure Analysis
Problem
Possible LED
Display
Possible Causes Solution
Short circuit between the inputs Locate and remove the short
Faulty SCR(s)
Remove power and test the SCR(s). Refer to section 8.2 for SCR Testing
procedure.
Short circuit or ground fault in motor or cabling Locate and remove the short or the ground
Phase Loss Repair the cause of the phase loss
Branch circuit protection not correctly sized Verify the correct sizing of the branch circuit protection
Faulty SCR(s)
Remove power and test the SCR(s). Refer to section 8.2 for SCR Testing
procedure.
Single phase incoming power Correct the problem with the incoming power
Faulty main circuit board
Remove power and replace the PC board assembly. Refer to section 8.4 fo
r
circuit board replacement procedure.
Overload improperly adjusted Adjust the overload (F003)
Excessive load on motor Lighten the load on the motor
Current limit set too low Increase the current limit set point (F014)
Incorrect start adjustment Readjust the starting parameters. Refer to Chapter 5.
Fan(s) not functioning
If the fans have power, remove power and replace the fan(s). If the fans do
not have power, find the cause of the power loss and repair
Heatsink coated with dirt
Remove power and clean the heatsink with high pressure air (80-100 PS
I
max, clean and dry air)
Over current on unit Verify that the running current does not exceed the unit rating.
Environment temperature over 120ºF (ambient
temperature for panel version) or over 104ºF
(ambient temperature for enclosed version)
Locate unit where the ambient temperature is less than 120ºF for the panel
mount version or less than 104ºF for the enclosed version
No control voltage applied to control board Apply control voltage to TB1 pins 1 and 6 on the power board
Control power transformer failure or CPT fuse
failure.
Remove power and replace the power transformer or the CPT fuse
Start circuit wired incorrectly Remove power and correct the start circuit wiring
No start command Apply the start command
No 3 phase line voltage Apply 3 phase line voltage to the unit
Failure of PC board assembly Replace PC board assembly
Faulty control logic Remove power and repair the control logic
Shorted SCR in starter
Refer to section 8.2 for SCR testing procedures and replace the faulty
(shorted) SCR(s)
Faulty motor Check the motor and the motor connections
Faulty SCR(s) Remove power and perform the SCR device checks
Faulty gate/cathode on SCR(s)
Refer to section 8.2 for SCR testing procedures and replace the faulty
(shorted) SCR(s)
Faulty PC board assembly Replace PC board assembly
Faulty motor / wiring Troubleshoot and repair
Faulty wiring Troubleshoot and repair / replace wiring
Faulty main circuit board Replace the PC board assembly
Load shorted / grounded/ faulted Remove power and repair
Faulty main circuit board Replace the PC board assembly
Short in control circuit Remove power, locate and remove the short
Wrong control voltage Apply the correct voltage to the control circuit
Warning: This is a serious fault condition. Ensure that the fault condition is cleared on the load before attempting to restart to
motor.
External Control
circuit fuses blow
after control power is
applied.
All LEDs: OFF
Extremely
unbalanced motor
currents during start
or run mode
Phase Loss LEDs:
ON
Motor stopped during
run
Over Current LEDs:
ON
Motor will not start
All LEDs: OFF
Power On LED: OFF
Start LED: OFF
Phase Loss LEDs:
ON
Shorted SCR LEDs:
ON
Motor vibrates /
Motor growls
Phase Loss LEDs:
ON
One of the main fuses
blows or circuit
breaker opens when
the power is applied
Shunt Trip LEDs:
ON
One of the main fuses
blows or circuit
breaker opens when
the start command is
given.
Overcurrent LEDs
:ON
Phase Loss LEDs:
ON
Motor overload trips
during start
Overload LEDs: ON
Thermostat trips
during run
Over Temp LEDs:
ON