To ensure adequate drive protection, the circuit breaker provided by the customer must fulfill
the following requirements:
● The total opening time of the circuit breaker – from the command to actually opening – must
not be more than 80 ms. It is not permissible that the opening time, specified in the technical
documentation of the circuit breaker manufacturer, exceeds 80 ms. The drive monitors the
total opening time.
● The drive monitors the TRIP coils (shunt releases) for wire breakage and failure of the
control voltage in the switchgear installation.
● 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 6SL3825
Operating Instructions 05/2020 23
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