ABB ACS2000 User Manual page 28

28 A C S 2 0 0 0 , 4 K V U S E R M A N U A L
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23
Grounding circuit
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24
Grounding the drive
1
2
3
4
5
6
7
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23
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. The DC link is considered
discharged when the voltage level is below 50 VDC.
At this voltage level, the "GROUND SW RELEASED"
pilot light (see 1, in Figure 24) on the door of the
control compartment will light up, indicating that
the grounding switch can be turned to the
grounded (O) position (see 2, in Figure 24).
When the grounding switch is in the grounded
position (see 2, in Figure 24), the Kirk® key and the
MV compartment door key (triangular) are used to
open the AFE/INU compartment door.
See Appendix P - Integral Input Contactor
Disconnect, located on the CD, for detailed
information on drives with this option.
2
1
Input filter
AFE - Active Front End
DC link
INU - INverter Unit
dV/dt output filter
Grounding switch
PE ground
3 4
6
7
It is not required to disconnect the main power
supply before grounding the drive via the
ground switch; with the integral input contactor
disconnect and auxiliary drive transformer option
the proper procedure is to let the drive discharge,
operate the ground switch, and then open the
isolation switch.
1
1 GROUND SW RELEASED pilot light
2 Grounding switch handle - grounded (OFF) position
3 Grounding switch handle - ungrounded (ON) position
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24
5
I
O
2
I
O
3