Fig. 2-4 Grounding Switch - ABB ACS5000 User Manual

Chapter 2 - Power electronics and cabinet features
Grounding switches
2-6 (16)
The grounding switches are safety devices that enable safe access to the
medium voltage compartments of the drive. There is a grounding switch in
each power cell.
Fig. 2-4 Grounding switch
When all three switches are in position grounded, the rectifier, the DC link
and the inverter in each power cell are connected to the PE ground
busbar.
The switch is electromechanically interlocked with a discharge monitoring
circuit to prevent closing of the switch while the DC-link capacitor is still
charged.
Grounding the drive is only possible after the main power supply has been
disconnected and the DC link has discharged. When the voltage is below
50 V (DC), the lamp GROUNDING SWITCH UNLOCKED
then light up and the grounding switches can be turned to position
grounded (Fig. 2-5: 2).
When the grounding switches are in position grounded, the door safety
switch of the rectifier/inverter compartment is released, and the door can
be opened.
3BHS221906 ZAB E01 Rev. D
ABB
(Fig. 2-5: 1)
5k A UM