| Generally, it is not recommended to connect the contactor at the output end of the frequency converter. | ||||||
| If the contactor must be connected, the following criteria should be followed: | ||||||
| First, pull in the contactor first, and then start the frequency converter; | ||||||
| Stop the machine, stop the frequency converter first, and then disconnect the contactor. | ||||||
| It is absolutely not allowed to cut in or disconnect the contactor suddenly when the frequency converter is in operation, | ||||||
| because this will cause huge impulse current, damage the frequency converter or motor, | ||||||
| and may lead to explosion in serious cases. | ||||||
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