LED | LCD | Description |
| Possible Causes |
Display | Display |
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*OP | Overvoltage |
| • | ASD attempting to start into a spinning motor after a |
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| DC bus voltage exceeds |
| momentary power loss. |
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| specifications. | • Incoming commercial power is above the specified | |
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| range. |
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| • Decel time is too short. | |
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| • Voltage spikes at the | |
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| filter. |
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| • | DBR required. |
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| • DBR resistance value is too high. | |
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| • DBR function is turned off. | |
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| • Overvoltage Stall feature is turned off. | |
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| • | System is regenerating. |
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| • | Load instability. |
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| • Disable the Ridethrough function (F302). | |
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OT | Overtorque | Torque requirement is in excess | • | ASD is not correctly matched to the application. |
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| of the setting of F616 or F617 | • F616 or F617 setting is too low. | |
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| for a time longer than the setting | ||
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| of F618. | • | Obstructed load. |
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*POFF | Control |
| • | Defective Control board. |
| Undervoltage | Undervoltage condition at the 5, | • Excessive load on power supply. | |
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| 15, or the 24 VDC supply. | ||
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| • | Low input voltage. |
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PtSt | Reference Point | Two | • | Two speed reference frequency setpoints are too close to |
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| setpoint values are too close to |
| each other (increase the difference). |
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| each other. |
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UC | Undercurrent | With the | this function sets the | |
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| (F610) parameter enabled, the |
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| output current of the ASD is |
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| below the level defined at F611 |
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| and remains there for a time |
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| longer than the setting of F612. |
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* Reset ignored if active. |
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H9 ASD Installation and Operation Manual | 249 |