You can use an MC as an alternative to a molded case circuit breaker (MCCB) when:
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The protective functions of the drive have been triggered
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An emergency stop occurred, and the sequence de-energizes the drive.
If an MC on the input side of the drive (primary side) stops the drive, regenerative braking will not operate, and the drive will coast to stop.
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When you connect electromagnetic switches or magnetic contactors to the output motor circuits, make sure that you sequence them correctly.
If the output motor circuit sequence is incorrect, it can cause damage to the drive.
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Damage to Equipment
Do not energize and de-energize the drive more frequently than one time each 30 minutes.
If you frequently energize and de-energize the drive, it can cause drive failure.
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Note:
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When machinery must not restart after recovery from a momentary power loss that occurred during run, install an MC at the input side of the drive and set a sequence that does not automatically set the Run command to ON after recovery of power.
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When it is necessary to stop momentary power loss, for example to maintain a circuit that has momentary power loss, use a delayed-release MC.
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Use an MC (magnetic contactor) to make sure that you can fully remove power to the drive when necessary. Wire the MC to open when a fault output terminal is triggered.
Protect the Braking Resistor/Braking Resistor Unit
Use an MC on the input side (primary side) to prevent damage to the braking resistor/braking resistor unit.
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Fire Hazard
When you use a braking unit, use a thermal relay on the braking resistors and set a fault contact output for the braking resistor unit to disconnect drive main power through an input contactor.
Incorrect braking circuit protection can cause the resistors to become too hot and cause serious injury or death.
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