Alarms, Trips, and Troubleshooting
Q9 Plus ASD Install/Op Manual
270 https://www.toshiba.com/tic/
Note: The event that caused the trip(s) must be corrected or must decrease to less than the
threshold value required to cause the trip to allow for a Reset to be recognized. In the event
of multiple active trips, the trip displayed will remain until all faults are corrected and
cleared.
OC3, OC3P Over-Current Run
Over-current during fixed
speed operation.
• ASD/Motor is improperly matched to the
application.
• Load fluctuations.
• ASD is operating at an elevated temperature.
• ASD current exceeds 320% or 340% of the rated
FLA on ASDs that are greater than 100 HP or
that are 100 HP or less, respectively, during
acceleration.
OCA1 U-Phase OC U-phase over-current.
• Low impedance at the U/T1 phase.
• IGBT failure.
OCA2 V-Phase OC V-phase over-current.
• Low impedance at the V/T2 phase.
• IGBT failure.
OCA3 W-Phase OC W-phase over-current.
• Low impedance at the W/T3 phase.
• IGBT failure.
OCL Output Short
Output short circuit at U-V-
W phases.
• ASD is starting into a rotating motor.
• ASD/Motor is improperly matched to the
application.
• Phase-to-phase short (U/T1, V/T2, or W/T3).
• Acceleration time is too short.
• Voltage Boost setting is too high.
• Motor/machine is jammed.
• Mechanical brake is engaged while the ASD is
running.
• Short Circuit Detection adjustment is required
(F613).
• ASD current exceeds 320% or 340% of the rated
FLA on ASDs that are greater than 100 HP or
that are 100 HP or less, respectively, during
acceleration.
• Motor winding short.
• Phase-to-phase short or phase-to-ground short
external to the ASD.
Table 18. Fault Codes (Continued)
LED
Screen
LCD
Screen
Fault Description Possible Cause
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