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248 H9 ASD Installation and Operation Manual
OC Over Current
ASD output current greater than
F601 setting.
• Defective IGBT (U, V, or W).
• ASD output to the motor is connected incorrectly.
Disconnect the motor and retry.
• ASD output phase-to-phase short.
• The ASD is starting into a spinning motor.
• Motor/machine jammed.
• Mechanical brake engaged while the ASD is starting or
while running.
• Accel/Decel time is too short.
• Voltage Boost setting is too high.
• Load fluctuations.
• ASD operating at an elevated temperature.
*OH Overheat
ASD ambient temperature
excessive.
• ASD is operating at an elevated temperature.
• ASD is too close to heat-generating equipment.
• Cooling fan vent is obstructed (see Mounting the H9
ASD on pg. 15).
• Cooling fan is inoperative.
• Internal thermistor is disconnected.
OJ Timer Run-time counter exceeded. • Type Reset required; select Clear run timer.
*OLI ASD Overload
Load requirement in excess of
the capability of the ASD.
• The carrier frequency is too high.
• An excessive load.
• Acceleration time is too short.
• DC damping rate is set too high.
• The motor is starting into a spinning load after a
momentary power failure.
• The ASD is improperly matched to the application.
OLM Motor Overload
Load requirement in excess of
the capability of the motor.
• V/f parameter improperly set.
• Motor is locked.
• Continuous operation at low speed.
• The load is in excess of what the motor can deliver.
*OLR Resistor
Overload
Excessive current at the
Dynamic Braking Resistor.
• Deceleration time is too short.
• DBR configuration improperly set.
LED
Display
LCD
Display
Description Possible Causes