3.5.7
Electromechanical door interlock system
The electromechanical door interlock system is designed to protect personnel, and is an
integral part of the safety concept. During operation and when the make-proof grounding switch
is open, all the doors are interlocked (with the exception of the door for the control section).
The electromechanical door interlock system ensures that the doors for the power unit cannot
be opened when the DC link voltage is above a defined threshold value. The control only
releases the door interlocking once the circuit breaker is safely open and the grounding switch
is closed. You can open the doors once released by the control.
The device cannot be switched on again until all the doors are closed. The doors remain
interlocked if the auxiliary voltage fails. For more information, refer to the Chapter
"Maintenance"
See also
3.5.8
Make-proof grounding switch
The make-proof grounding switch grounds the voltage DC link. This ensures that no hazardous
voltages are present in the DC link when the doors are opened.
To ensure that the device functions safely, the actuating lever for the make-proof grounding
switch must be withdrawn.
See also
Grounding using a make-proof grounding switch (Page 144)
3.5.9
Circuit-breaker (provided by the customer)
To ensure adequate device protection, the circuit breaker provided by the customer must fulfill
the following requirements:
● The maximum time between when the circuit-breaker trips to when a no-current state (I=0)
is reached is 80 ms.
● The circuit breaker must be equipped with an undervoltage tripping function.
● Avoid additional delay times when controlling the circuit breaker. All commands 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. Consequently, do not use any coupling
relays.
Description
3.5 Description of the components
SINAMICS SM150 6SL3810-7NN38-0AA1
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