Opening The Device - Siemens SINAMICS GL150 Operating And Installation Instructions

Figure 9-2
9.2

Opening the device

The drive is equipped with a door interlocking system. Depending on the design, this is an
electromechanical door interlocking system or optionally a safety locking system.
The power unit doors can only be opened under the following conditions:
● The DC link current is zero.
● The firing pulses are disabled.
● Voltages at the input and output sides are below a minimum value.
● The circuit breakers are open.
● Any grounding switches that may be present are closed.
● The mushroom pushbutton on the control unit is actuated.
SINAMICS GL150 6SL38503UM114PA0Z
Operating Instructions 04/2017
Example: Securing the grounding spider in place
By pressing the mushroom pushbutton, the contactor safety combination, and therefore
the undervoltage protection to the power units, is interrupted. Secure the mushroom
pushbutton so that it cannot be released by attaching a warning plate, for example.
Maintenance
9.2 Opening the device
105