LED Display

LCD Display

 

Possible Causes

 

 

 

 

 

 

 

 

OC2

 

Phase-to-phase short (U, V, or W).

 

Overcurrent During

• Deceleration time is too short.

 

Deceleration

 

 

 

 

 

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.

 

 

 

 

OC2P

 

Cooling fan inoperative.

 

Overheat During

• Ventilation openings are obstructed.

 

Deceleration

 

 

 

 

 

• 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.

 

 

 

 

OC3

 

Load fluctuations.

 

Overcurrent During

• ASD is operating at an elevated temperature.

 

Run

 

 

 

 

 

• 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.

 

 

 

 

OC3P

 

Cooling fan inoperative.

 

Overheat During Run

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 Overcurrent

Low impedance at the U lead of the ASD output.

 

 

 

 

OCA2 or OCL

V-Phase Overcurrent

Low impedance at the V lead of the ASD output.

 

 

 

 

OCA3 or OCL

W-Phase Overcurrent

Low impedance at the W lead of the ASD output.

 

 

 

 

OCR

 

ASD inability to discharge the bus voltage during regeneration.

 

Dynamic Braking

• No dynamic braking resistor (DBR) installed.

 

Resistor Overcurrent

 

 

 

 

 

• Deceleration time is too short.

 

 

• Improper DBR setup information.

 

 

• Defective IGBT7 (or IGBT7 ckt.).

 

 

3-phase input voltage is above specification.

 

 

 

 

OH

 

Cooling fan inoperative.

 

Overheat

• 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.

 

 

 

 

 

 

 

H9 ASD Installation and Operation Manual

253

Page 261
Image 261
Toshiba H9 operation manual OCA1 or OCL, OCA2 or OCL, OCA3 or OCL