Opening The Power Unit Doors For Maintenance Work; Manually Unlocking Power Unit Doors - Siemens SINAMICS GM150 Operating Instructions & Installation Instructions

9.3.1

Opening the power unit doors for maintenance work

The doors can only be opened under the following conditions:
● The DC-link voltage is below a threshold value of 60 V.
● The circuit-breaker is open.
● The make-proof grounding switch is closed. The make-proof grounding switch is enabled by
● With synchronous motors, the field contactor must return the external enable signal at the
The position of the grounding switch lever is linked with the check-back signal for the status of
the "Opened" power system breaker and the threshold value (V<Vlimit).
Electric shock although the door interlocking has been released
Even when the door interlocking is released, dangerous high voltages can still be present at
the auxiliary circuits, e.g. fans, anti-condensation heating, closed-loop control, etc. High
voltages can cause death or serious injury if safety rules are not observed or if equipment is
handled improperly.
● Ensure that work is only carried out by qualified personnel.
● Carefully comply with the 5 safety rules.
● Strictly observe the warnings provided in these operating instructions, and the safety-
Not activated door lock
If the door locking mechanism is not activated during operation, then the drive can be
grounded live and cause a short-circuit in the DC link. A DC-link short-circuit can result in
death, serious injury, or material damage.
Remove the grounding bar before the voltage is switched on. This then activates the
mechanical interlocking system, guaranteeing safe drive operation.
9.3.2

Manually unlocking power unit doors

If the auxiliary voltage fails, you can only unlock the doors manually. To unlock the doors,
proceed as described in the chapter titled "Preparation for use".
See also
Opening doors in preparation for use (Page 67)
SINAMICS GM150 6SL3810-2LN31-8AA2
Operating Instructions Rev.201910281332 EXAMPLE
the software.
input with the status "OFF".
WARNING
relevant information on the product itself.
WARNING
Maintenance
9.3 Opening the doors
175