Toshiba H9 ASD Installation And Operation Manual page 258

LED Screen
OC2
OC2P
OC3
OC3P
OCA1 or OCL
OCA2 or OCL
OCA3 or OCL
OCR
OH
OH2
H9 ASD Installation and Operation Manual
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Over-Current During • Phase-to-phase short (U, V, or W).
Deceleration
• 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.
Overheat During • Cooling fan inoperative.
Deceleration
• 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.
Over-Current During • Load fluctuations.
Run
• 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.
Overheat During 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.
U-Phase Over-Current • Low impedance at the U lead of the ASD output.
V-Phase Over-Current • Low impedance at the V lead of the ASD output.
W-Phase Over-Current • Low impedance at the W lead of the ASD output.
Dynamic Braking • ASD inability to discharge the bus voltage during regeneration.
Resistor Over-Current
• 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.
Overheat • Cooling fan inoperative.
• Ventilation openings are obstructed.
• Internal thermistor is disconnected.
External Overheat • Excessive-heat signature received at the TB3 – TH1(+) and TH1(-)
terminals. See
Possible Causes
F637 for setup information.
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