● The "zero voltage criterion" in the DC link is fulfilled.
● The "zero voltage criterion" at the phase connection is fulfilled.
● None of the cell controls supplies status information.
The cell electronics no longer operate below a cell voltage of 200 V. As a consequence,
status information is no longer transferred to the control.
● The cell electronics no longer functions.
Up to the residual discharge (<5 V), the system waits for 5x the time constant of the
discharge resistor and cell capacitor. For the components being used, this results in a time
constant of at least 14 minutes.
WARNING
Danger to life even after shutdown
After shutdown, high voltages are present at the drive and its components. Furthermore, if the
connection to the machine or the line supply is not disconnected and grounded, these voltages
can persist. Touching live components can result in death or serious injury.
● Never force the doors open during operation or while the DC link capacitors are being
discharged.
● The five safety rules (Page 15) must be observed.
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".
9.4 Preventive maintenance
9.4.1 Inspection
The purpose of an inspection is to ascertain and evaluate the current status of the equipment.
An inspection mainly comprises visual checks. Inspections should be carried out based on a
schedule that meets the needs of the special ambient conditions at the location of use. The
following servicing and inspection instructions are used as the basis for regular inspection of
the equipment.
Maintenance
9.4 Preventive maintenance
SINAMICS PERFECT HARMONY GH150 6SL38253AE412AA1-Z
Operating Instructions Rev.201910281231 EXAMPLE 107
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