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W7 ASD Installation and Operation Manual 151
Motor Overload • V/f setting needs to be adjusted.
• Motor is locked.
• Continuous operation at low speed.
• Load requirement exceeds ability of the motor.
• Startup frequency setting adjustment required.
Option PCB Error • Optional device malfunction.
• Improper system settings (at ASD or optional device).
• Loose or improper connection.
Out(put) Phase Loss • 3-phase output from the ASD is low or missing.
Overcurrent Acc • V/f setting needs to be adjusted.
• Restart from a momentary power outage.
• The ASD is starting into a rotating motor.
• ASD/Motor not properly matched.
• Phase-to-phase short (U, V, or W).
• Accel time too short.
• Voltage Boost setting is too high.
• Motor/machine jammed.
• Mechanical brake engaged while the ASD is running.
• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
during acceleration. On ASDs that are greater than 100 HP, this fault occurs when
the ASD current exceeds 320% of the rated FLA during acceleration.
Overcurrent Dec • Phase-to-phase short (U, V, or W).
• Deceleration time is too short.
• Motor/machine jammed.
• Mechanical brake engaged while the ASD is running.
• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
during deceleration. On ASDs that are greater than 100 HP, it occurs when the
ASD current exceeds 320% of the rated FLA during deceleration.
Overcurrent Run • Load fluctuations.
• ASD is operating at an elevated temperature.
• ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or less
during a fixed-speed run or if during a fixed-speed run the ASD overheats. On
ASDs that are greater than 100 HP, it occurs when the ASD current exceeds 320%
of the rated FLA on a fixed-speed run.
Overheat • Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
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 all trips are cleared.
Fault Screen Display Possible Causes