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The fourth protection circuit to prevent short circuit when the motor is started in reverse
Source: InternetPublisher:containsmachine Keywords: Protection circuit motor short circuit BSP Updated: 2020/04/15
It uses voltage interlock relays KAi and KAz to ensure arc extinguishing during the forward and reverse switching process
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In the picture. SA is the main command switch; KA3 is the undervoltage relay.
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