ABB ACS2000 User Manual page 50

Chapter 2 - Power electronics and cabinet features
Legend
1 Input filter
2 AFE - Active Front
End
3 DC link
4 INU - INverter Unit
5 dV/dt output filter
6 Grounding switch
7 PE ground
Figure 2-8 Grounding circuit
2-10 (28)
1
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 2-9) 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 2-9).
When the grounding switch is in the grounded position (see 2, in Figure
®
2-9), 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.
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.
2UEA001270 Rev. F
2 3
6
7
4 5
ACS2000 User manual