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Details of zero current detection
I am planning to use the zero current detection of the FR-A024 inverter. While the Instruction Manual defines zero current detection as "L level is detected when the output current goes lower than the certain value during inverter operation and H level when it goes higher than a certain value". Is this also true during DC injection brake operation? What happens during DC injection brake operation?
When having the motor decelerate to stop, can I use the output signal from the zero current detection function to apply a mechanical brake after applying the DC injection brake?
When having the motor decelerate to stop, can I use the output signal from the zero current detection function to apply a mechanical brake after applying the DC injection brake?
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Answer
1. The inverter also monitors the output current during DC injection brake operation in addition to normal operation. Therefore, zero current detection also works during DC injection brake operation.
2. Usually, the operating (RUN) signal or frequency detection (FU) signal is used to apply a mechanical brake.
Although it is possible to use the zero current detection output signal to apply the mechanical brake, zero current detection is not performed after completion of DC injection brake operation since the inverter is stopped.
Therefore, when deceleration stop has been completed normally, the zero current detection signal is not output. (Therefore, the mechanical brake does not work.)
Adjust the operation voltage of the DC injection brake so that the current can be detected.
2. Usually, the operating (RUN) signal or frequency detection (FU) signal is used to apply a mechanical brake.
Although it is possible to use the zero current detection output signal to apply the mechanical brake, zero current detection is not performed after completion of DC injection brake operation since the inverter is stopped.
Therefore, when deceleration stop has been completed normally, the zero current detection signal is not output. (Therefore, the mechanical brake does not work.)
Adjust the operation voltage of the DC injection brake so that the current can be detected.
- Product Name
- Inverter, magnet motor drive
- Product Category
- Inverter
- Series
- FR-A024
