● The circuit breaker must be equipped with an undervoltage tripping function. The
undervoltage trip unit (low-voltage coil) is controlled via the tripping circuit in which the
"undervoltage trip unit" of the drive must also be integrated. The auxiliary voltage from the
switchgear (this is a reliable supply) is used as the supply.
● Avoid additional delay times when controlling the circuit breaker. All commands from the
drive to the circuit breaker must act directly without intervention of coupling relays.
● A feedback signal must be available for each of the circuit breaker states CLOSED and
OPEN. The feedback signals must not be delayed. Do not use any coupling relays.
● An additional, independently operating overcurrent protection for the circuit breaker must be
provided on the plant side (transformer and cable protection).
● The circuit breaker is activated and enabled by the drive closed-loop controller. Under no
circumstances should you close the circuit breaker by external mechanical or electrical
means. A mechanical interlock of the manual ON command at the circuit breaker prevents
destruction of the drive as a result of an uncoordinated switch-on operation.
2.8 Residual risks
According to the EU machinery directive, machine manufacturers / plant operators must
conduct a risk assessment of their machine. Plant operators must conduct a risk assessment
of their plant. In particular, pay attention to Annex 1 "General Principles" of the EU machinery
directive.
Safety instructions
2.8 Residual risks
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
24 Operating Instructions Rev.201910281231 EXAMPLE
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