P9 ASD Installation and Operation Manual 265
OC3P Overheat During Run • Cooling fan is inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
• Improper V/f setting.
• ASD or the motor is improperly matched to the application.
OCA1 or OCL U-Phase Over-Current • Low impedance at the U lead of the ASD output.
OCA2 or OCL V-Phase Over-Current • Low impedance at the V lead of the ASD output.
OCA3 or OCL W-Phase Over-Current • Low impedance at the W lead of the ASD output.
OCR Dynamic Braking
Resistor Over-Current
• ASD inability to discharge the bus voltage during regeneration.
• No dynamic braking resistor (DBR) installed.
• Deceleration time is too short.
• Improper DBR setup information.
• Defective IGBT7 (or IGBT7 ckt.).
• 3-phase input voltage is above specification.
OH Overheat • Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
OH2
External Overheat • Excessive-heat signature received at the TB3 – TH1(+) and TH1(-)
terminals. See F637 for setup information.
OL1 ASD Overload • Acceleration time is too short.
• DC Injection current is too high.
• Improper V/f setting.
• Motor is running during restart.
• ASD or the motor is improperly matched to the application.
OL2 Motor Overload • Improper V/f setting.
•Motor is locked.
• Continuous operation at low speed.
• Load requirement exceeds ability of the motor.
• Startup frequency setting adjustment required.
OLR Dynamic Braking
Resistor Overload
• Deceleration time is too short.
• DBR setting adjustment is required.
• Over-Voltage Stall setting adjustment is required.
OP1 Over-Voltage During
Acceleration
• Motor is running during restart.
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 cleared.
Table 15. P9 ASD Fault Listing. (Continued)
LED Screen LCD Screen Possible Causes/Troubleshooting
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