Unattended Start Protection
If the Run command is already set when power is turned ON, the inverter starts running immediately after powerup. The Unattended Start Protection (USP) function prevents that automatic startup, so that the inverter will not run without outside intervention. When USP is active and you need to reset an alarm and resume running, either turn the Run command OFF, or perform a reset operation by the terminal [RS] input or the keypad Stop/reset key.
In the figure below, the [USP] feature is enabled. When the inverter power turns ON, the motor does not start, even though the Run command is already active. Instead, it enters
the USP trip state, and displays E 13 error code. This requires outside intervention to reset the alarm by turning OFF the Run command per this example (or applying a reset). Then the Run command can turn ON again and start the inverter output.
| Run command [FW,RV] | 1 |
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| [USP] terminal | 1 |
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| Alarm output terminal | 1 |
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| Inverter output frequency | 0 |
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| Inverter power supply | 1 |
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| E13 | Alarm | Run | |
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Option | Terminal | Function Name | State |
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13 | USP | Unattended Start |
| ON | On powerup, the inverter will not resume a Run | ||||||||||||||||
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| OFF | On powerup, the inverter will resume a Run | |||||||||||||||
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| command that was active before power loss | |||||||||||||||
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| C001 C007 |
| Example (default input configuration shown see | ||||||||||||||||
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| • Note that when a USP error occurs and it is |
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| canceled by a reset from a [RS] terminal input, the |
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | L | PLC | P24 |
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| inverter restarts running immediately. |
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•Even when the trip state is canceled by turning
the terminal [RS] ON and OFF after an under |
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voltage protection E09 occurs, the USP function |
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will be performed. | See I/O specs on page 21,22. | ||
• When the running command is active immediately | |||
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after the power is turned ON, a USP error will |
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occur. When this function is used, wait for at least |
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three (3) seconds after the powerup to generate a |
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Run command. |
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34
