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LED Screen
OC2
Over-Current During
Deceleration
OC2P
Over-Heat During
Deceleration
OC3
Over-Current During
Fixed Speed
OC3P
Over-Heat During Run • Cooling fan inoperative.
OCA1 or OCL
U-Phase Over-Current
OCA2 or OCL
V-Phase Over-Current
OCA3 or OCL
W-Phase Over-Current • Low impedance at the W lead of the ASD output.
OCR
Dynamic Braking
Resistor Over-Current
OH
Over-Heat
GX9 ASD Installation and Operation Manual
LCD Screen
• 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.
• Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
• Deceleration time is too short.
• DC Injection current is too high.
• ASD or the motor is improperly matched to the application.
• 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.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
• Improper V/f setting.
• ASD or the motor is improperly matched to the application.
• Low impedance at the U lead of the ASD output.
• Low impedance at the V lead of the ASD output.
• 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.
• Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
Possible Causes/Troubleshooting
231
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