Technical information

7 – TROUBLESHOOTING
104
Motor current dropped under the Under Current Trip Level setting
(P26/PFN03) for longer than the Under Current Trip Delay time setting
(P27/PFN04).
F34 Undercurrent
Check system for cause of under current condition.
A current imbalance larger than the Current Imbalance Trip Level
parameter setting (P28/PFN05) was present for longer than ten (10)
seconds.
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.
F37 Current Imbalance
Check motor for internal problems.
Ground current above the Ground Fault Trip level setting (P29/PFN06)
has been detected for longer than 3 seconds.
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 (P1/QST01), CT ratio (P68/FUN03) and
burden switch settings are correct.
Verify that the CTs are installed with all the White dots towards the input
line.
F38 Ground Fault
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
control card.
Motor current went below 10% of FLA while the starter was running.
Verify Motor Connections.
Verify the CT wiring to the MX control card.
Verify that the motor FLA (P1/QST01), CT ratio (P68.FUN03) and
burden switch 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 for loose connections.
F39 No Current at Run
Check for inline contactor or disconnect.
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 control card.
Check all SCRs with ohmmeter for shorts.
Verify that the Input Phase Sensitivity parameter setting (P67/FUN04) is
correct.
Verify that the Starter Type parameter setting (P64/FUN07) is correct.
F40 Shorted / Open SCR
Verify the motor wiring. (Verify dual voltage motors for correct wiring
configuration).