7.8 Associated Protection provided by the Customer
To ensure adequate protection for VFDs, the associated protection (that is, the circuit breaker or
fused contactor) provided by the customer must fulll the following requirements:
• The rated interrupting time of the associated protection shall not exceed 100 ms (duration
between trip to no-current state).
• A feedback signal must be provided from the associated protection to indicate the status -
CLOSED or OPEN for VFDs with precharge.
• The associated protection must be connected as described in the section of this manual
entitled "Control Section".
• An overcurrent protection device must be provided to protect the VFD.
• When provided, the master mechanical interlock key (K1) must be coordinated with the
associated protection.
• This device is considered the main upstream isolating / disconnecting means for the
equipment and is subject to the local governing electrical codes (e.g., NEC, CEC, EU norms).
Electrical Connections
7.8 Associated Protection provided by the Customer
Type 6SR5 Air-Cooled
Operating Instructions, AK, A5E39390112 49
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