Toshiba vlp technology P9 ASD Installation & Operation Manual page 276

LED Screen
Overheat During
OC1P
Acceleration
Over-Current During
OC2
Deceleration
Overheat During
OC2P
Deceleration
Over-Current During
OC3
Run
Overheat During Run
OC3P
U-Phase Over-Current
OCA1 or OCL
V-Phase Over-Current
OCA2 or OCL
W-Phase Over-Current • Low impedance at the W lead of the ASD output.
OCA3 or OCL
Dynamic Braking
OCR
Resistor Over-Current
268
LCD Screen
• Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
• Acceleration time is too short.
• Improper V/f setting.
• ASD or the motor is improperly matched to the application.
• 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.
• Cooling fan inoperative.
• 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.
Possible Causes/Troubleshooting
P9 ASD Installation and Operation Manual