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A: There are below possible reasons, please check one by one.
1. There is no short circuit jumper between + 24 V and PW on the terminals;
2. The + 24 V power supply on the terminal is abnormal, please test;
3. If only one digital terminal is invalid, that means the circuit corresponding to that terminal is damaged, other terminals can be used for test;
4. The terminal polarity is set incorrectly;
5. The function parameters of the corresponding terminals of VFD are set improperly, please check the parameters.
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