Toshiba Q9+ - Page 277

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