BENSHAW RediStart MX3 Series, User Manual

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191
8 - TROUBLESHOOTING & MAINTENANCE
Fault Code Description Detailed Description of Fault / Possible Solutions
F31 Over current
Motor current exceeded the Over Current Trip Level setting (PFN01) for longer
than the Over Current Trip Delay Time setting (PFN02).
Check motor for a jammed or an overload condition.
F34 Undercurrent
Motor current dropped under the Under Current Trip Level setting (PFN03) for
longer than the Under Current Trip Delay time setting (PFN04).
Check system for cause of under current condition.
F35 Power Factor Leading
The motor power factor went above the PF leading trip level.
Verify loading of motor.
On synchronous motors, verify field supply current.
F36 Power Factor Lagging
The motor power factor went below the PF lagging trip level.
Verify loading of motor.
On synchronous motors, verify field supply current.
F37 Current Imbalance
A current imbalance larger than the Current Imbalance Trip Level parameter
setting (PFN05) was present for longer than the curr imbal trip time (PFN06).
Check motor wiring for cause of imbalance. (Verify dual voltage and 6 lead
motors for correct wiring configuration).
Check for large input voltage imbalances that can result in large current
imbalances.
Check motor for internal problems.
F38 Ground Fault
Ground current above the Ground Fault Trip level setting (PFN07 / PFN08) has
been detected for longer than the delay time (PFN09) setting.
Check motor wiring for ground faults.
Check motor for ground faults.
Megger motor and cabling (disconnect from starter before testing).
Verify that the motor FLA (QST01) and CT ratio (FUN03) settings are correct.
Verify that the CTs are installed with all the White dots towards the input line.
In Single phase applications, verify that only two CTs are being used; that they are
installed with all the White dots or Xs in the correct direction; and that the CTs are
connected to the L1 and L3 CT inputs on the MX
3
control card.
F39 No Current at Run
Motor current went below 10% of FLA while the starter was running.
Verify Motor Connections.
Verify the CT wiring to the MX
3
control card.
Verify that the motor FLA (QST01) and CT ratio (FUN03) settings are correct.
Check if load is still connected to starter.
Check if motor may have been driven by the load (a regeneration condition).
Check Gate and Cathode connections to MX
3
for loose connections.
Check for inline contactor or disconnect.
F40 Shorted / Open SCR
A shorted or open SCR condition has been detected.
Verify that all SCR gate leads wires are properly connected at the SCR devices
and the MX
3
control card.
Check all SCRs with ohmmeter for shorts.
Verify that the Input Phase Sensitivity parameter setting (FUN04) is correct.
Verify that the Starter Type parameter setting (FUN07) is correct.
Verify the motor wiring. (Verify dual voltage motors for correct wiring
configuration).