Toshiba G9 Installation And Operation Manual page 259

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OC2 Over-Current During
Deceleration
OC2P Over-Heat During
Deceleration
OC3 Over-Current During Run
OC3P Over-Heat During Run
OCA1 or OCL U-Phase Over-Current
OCA2 or OCL V-Phase Over-Current
OCA3 or OCL W-Phase Over-Current
OCR Dynamic Braking Resistor
Over-Current
OH Over-Heat
External Over-Heat
OH2
G9 ASD Installation and Operation Manual
Possible Causes
• 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.
• Low impedance at the W lead of the ASD output.
• ASD inability to discharge the bus voltage during regeneration.
• No Dynamic Braking Resistor (DBR) installed.
• DBR value is too low.
• 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.
• Excessive-heat signature received at the TB3 – TH1(+) and TH1(-) terminals.
See F637 for setup information.
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