LED Display | LCD Display |
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OC2 |
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| Overcurrent During | • Deceleration time is too short. | |
| Deceleration | ||
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| • | Motor/machine jammed. |
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| • Mechanical brake engaged while the ASD is running. | |
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| • ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or | |
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| less during deceleration. On ASDs that are greater than 100 HP, it occurs |
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| when the ASD current exceeds 320% of the rated FLA during deceleration. |
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OC2P |
| • | Cooling fan inoperative. |
| Overheat During | • Ventilation openings are obstructed. | |
| Deceleration | ||
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| • Internal thermistor is disconnected. | |
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| • Deceleration time is too short. | |
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| • DC Injection current is too high. | |
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| • ASD or the motor is improperly matched to the application. | |
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OC3 |
| • | Load fluctuations. |
| Overcurrent During | • ASD is operating at an elevated temperature. | |
| Run | ||
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| • ASD current exceeds 340% of the rated FLA on ASDs that are 100 HP or | |
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| less during a |
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| overheats. On ASDs that are greater than 100 HP, it occurs when the ASD |
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| current exceeds 320% of the rated FLA on a |
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OC3P |
| • | Cooling fan inoperative. |
| Overheat During Run | • | Ventilation openings are obstructed. |
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| • Internal thermistor is disconnected. | |
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| • | Improper V/f setting. |
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| • ASD or the motor is improperly matched to the application. | |
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OCA1 or OCL | • | Low impedance at the U lead of the ASD output. | |
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OCA2 or OCL | • | Low impedance at the V lead of the ASD output. | |
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OCA3 or OCL | • | Low impedance at the W lead of the ASD output. | |
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OCR |
| • | ASD inability to discharge the bus voltage during regeneration. |
| Dynamic Braking | • No dynamic braking resistor (DBR) installed. | |
| Resistor Overcurrent | ||
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| • Deceleration time is too short. | |
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| • Improper DBR setup information. | |
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| • Defective IGBT7 (or IGBT7 ckt.). | |
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OH |
| • | Cooling fan inoperative. |
| Overheat | • Ventilation openings are obstructed. | |
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| • Internal thermistor is disconnected. | |
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OH2 | External Overheat | • | |
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| terminals. See F637 for setup information. | |
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H9 ASD Installation and Operation Manual | 253 |