● Precharging resistors
● Contactor for switching on and off
● Circuit-breaker
Detailed information about interconnecting the precharging components is provided in the
circuit manual. The component mounting locations are provided in the layout diagram.
Designation Value
Precharging time
1)
25 s
Precharging current in three-phase 400 V supply 20 A
Discharging time of the DC link T
DISCH
1)
≈ 300 s
1)
The time can vary depending on the system
3.5.4 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
Opening the doors (Page 160)
3.5.5 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 drive functions safely, the actuating lever for the make-proof grounding
switch must be removed.
Description
3.5 Description of the components
SINAMICS SM150 6SL3845-7NN46-7AA0
36 Operating Instructions 04/2017
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