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LED
LCD
Screen
Screen
Lower Limit
LLT
Part Replace
LTA
Main Under-Volts
MOFF
Over-Current
OC
*Over-Heat
*OH
Run-Time Counter
OJ
* Reset ignored if active.
https://www.toshiba.com/tic/
Alarms, Trips, and Troubleshooting
Table 17. Alarms. (Continued)
Alarm Description
Lower-Limit Time.
• Parameter
Part replacement alarm.
• Part Replacement Alarm at
• 3-phase input voltage low.
• Defective control board.
• Excessive load on power supply.
Under-Voltage (Main
• Under-Voltage/Ridethrough settings require
Circuit Power Supply).
• Failed rectifier module.
• PO–PA jumper missing or loose.
• Phase-to-phase short (U/T1, V/T2, or W/T3).
• Defective IGBT (U/T1, V/T2, or W/T3).
• ASD output to the motor is connected
• ASD is attempting to start into a spinning motor
• Motor/machine is jammed.
• Mechanical brake engaged while the ASD is
• Acceleration/deceleration time is too short.
ASD Output Current
greater than
F601
setting.
• Voltage Boost setting is too high.
• V/f setting adjustment is required.
• Load fluctuations.
• ASD is operating at an elevated temperature.
• ASD/Motor is improperly matched.
• ASD current exceeds 320% or 340% of the
• Normal when Automatic Accel/Decel active.
• ASD is operating at an elevated temperature.
• ASD is too close to heat-generating equipment.
Over-Heating.
• Cooling fan vent is obstructed.
• Cooling fan is inoperative.
• Internal thermistor is disconnected.
User-set run-time counter
• Type Reset is required; select Clear run timer.
exceeded.
Q9 Plus ASD Install/Op Manual
Possible Cause
F256
adjustment is required.
F634
adjustment.
incorrectly.
after a momentary power loss.
starting or while running.
rated FLA on ASDs that are greater than 100
HP or that are 100 HP or less, respectively,
during acceleration.
timed out.
265
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