P9 ASD Installation and Operation Manual 259
*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 ASD
on pg. 15).
• Cooling fan is inoperative.
• Internal thermistor is disconnected.
*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 is 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 is improperly set.
*OP *Over-Voltage DC bus voltage exceeds
specifications.
• ASD is attempting to start into a spinning motor after a
momentary power loss.
• Incoming commercial power is above the specified
range.
• Decel time is too short.
• Voltage spikes at the 3-phase input; install inductive
filter.
• DBR is required.
• DBR resistance value is too high.
• DBR function is turned off.
• Over-Voltage Stall feature is turned off.
• System is regenerating.
• Load instability.
• Disable the Ridethrough function (F302).
OT Over-Torque Torque requirement is in excess
of the setting of F616 or F617
for a time longer than the setting
of F618.
• ASD is not correctly matched to the application.
• F616 or F617 setting is too low.
• Obstructed load.
*POFF *Control Under-
Voltage
Under-voltage condition at the 5,
15, or the 24 VDC supply.
• Defective Control board.
• Excessive load on power supply.
• Low input voltage.
* Reset ignored if active.
Table 14. P9 ASD Alarms.(Continued)
LED
Screen
LCD
Screen
Description Possible Causes/Troubleshooting
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