ABB ACS880-204 Hardware Manual page 122

122 Electrical installation
WARNING! If a supply module whose varistors are not disconnected is installed
on an IT system (an ungrounded power system or a high resistance grounded
[over 30 ohms] power system), the system is connected to earth potential through
the varistors of the supply module. This may cause danger or damage the supply module.
If a supply module whose varistors are not disconnected is installed on a corner grounded
TN system, the supply module will be damaged.
3. Fasten the two cable clamp plates included in the supply module, one at the top, one
at the bottom. The clamp plates are identical. Using the cable clamp plates will provide
better EMC compliance, as well as act as a strain relief for the power cables.
4. Strip the power cables so that the shields are bare at the cable clamps.
5. Twist the ends of the cable shield wires into pigtails.
6. Strip the ends of the phase conductors.
7. Connect the phase conductors to the input terminals of the main switch-disconnector
[Q1]. For the tightening torques, see Cabinet design and construction instructions for
ACS880 multidrive modules (3AUA0000107668 [English]).
8. Connect the output terminals of the main switch-disconnector [Q1] to the main
contactor [Q2] input terminals.
9. Connect the contactor [Q2] output terminals to the WFU-xx LCL filter module input
terminals (L1/L2/L3). See section
(frames R1i...R4i) on page 133.
10. Connect the phase conductors of the WFU-xx LCL filter module output terminals
(U2/V2/W2) to the phase conductors of the AC input terminals (U2/V2/W2) of the
IGBT supply module. See section
R1i...R4i) on page 134.
11. Connect the phase conductors of the DC output cable to the UDC+ and UDC-
terminals of the IGBT supply module.
Connect the resistor cable conductors (if present) to the R+ and R– terminals.
With frames R3i or R4i, attach the screw terminal lugs included to the conductors first.
Crimp lugs can be used instead of the screw lugs.
12. Tighten the cable clamps onto the bare cable shields.
13. Crimp a cable lug onto each shield pigtail. Fasten the lugs to ground terminals.
Note: Make a compromise between the length of the pigtail and the length of
unshielded phase conductors as both should ideally be as short as possible.
14. Cover visible bare shield and pigtail with insulating tape.
15. With frames R3i or R4i, cut suitable slots on the edges of the connector covers to
accommodate the AC and DC cables. Refit the covers. (Tighten the screws to 3 N·m
[25 lbf·in]).
16. Secure the cables outside the unit mechanically.
17. Ground the other end of the input power cable shield or PE conductor(s) at the
distribution board.
18. Connect the module DC busbars into the cabinet common DC busbars.
Connecting the WBCA adapter to the LCL filter
Connecting WFU-xx LCL filter module (frames