ABB ACS2000 AFE 2MVA User Manual page 39

39 ACS2000 AFE 2MVA UM 3BHS355653 ZAB E01 REV. H
Grounding switch
—
References
The grounding switch is a safety device that
—
enables safe access to the AFE-INU compartment
2-9 Grounding switch
—
of the drive.
2-10 Grounding circuit
—
2-11 Grounding the drive
When the switch is in position grounded, input fil-
ter (1)
(5) of the drive are connected to the PE ground bus
(6).
The switch is electromechanically interlocked with
a discharge monitoring circuit that prevents clos-
ing of the switch while the DC link capacitor is still
charged.
Grounding the drive is only possible after the main
—
2-9
1 2
—
2-10
Fault
1
—
2-11
AFE (2), DC link (3), INU (4) and output filter
3 4
6
2
Grounding switch
power supply has been disconnected and the DC
link has discharged. When the voltage is below 50 V
(DC), press the pushbutton
Unlocked
(1)
door (the pushbutton lights up) and - at the same
time - turn the grounding switch to the position
grounded (2).
When the grounding switch is in position
grounded, the door safety switch of the AFE-INU
compartment will be released and the door can be
opened.
5
Grounding Switch
located on the control compartment