Siemens SINAMICS GL150, Operating Instructions Manual

Page: 125 / 168

Disconnecting the demagnetization equipment from the low-voltage supply
For systems with demagnetizing equipment, in addition to disconnecting the medium voltage,
you must also disconnect the demagnetization equipment from the low-voltage supply.
DANGER
Electric shock hazard
To demagnetize, for example, the demagnetizing equipment generates a medium voltage
from the 400 V supply and feeds this medium voltage into the system. When working on the
system and with the fuse switch disconnector closed, if this voltage is touched, then it can
result in death or severe physical injury.
● Always open the fuse switch disconnector before working on the system. Observe the five
safety rules.
1. Swing open the fuse holder of the fuse switch disconnector.
2. Remove the fuse holder.
Figure 9-2 Fuse switch disconnector with fuse holder swung out
9.3 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 door of the closed-loop control cabinet is not electromechanically interlocked. For this
reason, it can also be opened during operation.
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.
Maintenance
9.3 Opening the device
SINAMICS GL150 6SL38555UN113KA0Z
Operating Instructions Rev.201910281450 EXAMPLE
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