Chapter 6 - Insulation Resistance Measurement
ABB
32 (of 62) 3BHS135824 ZAB E01Rev. D ACS 6000 Commissioning Manual
6.2.3 CBU Preparation
The following preparatory measures must be taken in a Capacitor Bank
Unit (CBU):
2
3
4
5
6
PGND
DC_plus
DC_NP
DC_minus
Short circuit of DC link busbars is already made in TEU.
1 Make a short circuit between the auxiliary contacts of the earthing
isolator and connect it to ground (-X715 / 9,10).
Note that the earthing isolator must be in position “NOT EARTHED”.
2 Short circuit and ground the coil of the charging relay K2CHU
(-X714 / 1,2)
3 Ground the primary side of the charging transformer TCHU
(-X710 / 7)
4 Connect the secondary side of the charging transformer TCHU to
the DC link and short circuit the charging diode bridge.
5 Short circuit the common mode filter capacitor CGND.
6 Disconnect the common mode filter capacitor CGND from PE
(protective earth).
7 Disconnect the HV-line from the coupling unit AGH520S, if included
in the converter configuration.
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