Siemens SINAMICS PERFECT HARMONY GH150

3.8.2 Door limit switch
Door limit switches monitor the doors. The circuit breaker opens when a door is opened.
3.8.3 Electromechanical door interlocking system
The electromechanical door interlock system is designed to protect personnel, and is an
integral part of the safety concept. During operation all the doors are interlocked (with the
exception of the door for the Control Module).
The electromechanical door interlocking system prevents access to the power unit while
operational. The following conditions must be fulfilled in order to open the doors. You can open
the doors once released by the control.
For more information see section "Opening device" in the "Maintenance" chapter.
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 on this topic, see section "Repair"
in the "Maintenance" chapter.
See also
Opening the device (Page 106)
3.8.4 Precharging
The power cell capacitors must be precharged in order to avoid overcurrents and temporary
overvoltage conditions in the DC link when connecting the line supply. The DC link is
precharged via the auxiliary supply.
The precharging circuit comprises the following components:
● Precharging transformer
● Diode bridge
● 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.
Description
3.8 Components
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
Operating Instructions Rev.201910281231 EXAMPLE 39