Procedure - ABB ACSM1 Hardware Manual

Procedure

For cabling drawings and tightening torques for each frame size, see pages
1. Frame sizes C and D only: Remove the two plastic connector covers at the top
and bottom of the regen supply module. Each cover is fastened with two screws.
2. On IT (ungrounded) systems and corner grounded TN systems, disconnect the
internal varistors by removing the screw labelled VAR (located close to the
supply terminals on the power unit). Also remove the screws labeled VARISTOR
(1 screw) and FILTER (2 screws) in the WFU-xx regen supply module.
WARNING! If a regen 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 regen supply module whose varistors are not disconnected is installed on a
corner grounded TN system, the regen supply module will be damaged.
3. Fasten the two cable clamp plates included to the regen supply module (see
page 50), one at the top, one at the bottom. The clamp plates are identical.
Using the cable clamp plates as shown below 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 of the DC supply cable to the UDC+ and UDC-
terminals of the regen supply module.
Connect the phase conductors of the U2/V2/W2 cable in the WFU-xx regen filter
module to the U2, V2 and W2 terminals in the regen supply module.
Connect the resistor cable conductors (if present) to the R+ and R– terminals.
With frame size C or D, attach the screw terminal lugs included to the
conductors first. Crimp lugs can be used instead of the screw lugs.
8. Tighten the cable clamps onto the bare cable shields.
9. 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.
10. Cover visible bare shield and pigtail with insulating tape.
11. With frame size C or D, cut suitable slots on the edges of the connector covers
to accommodate the AC and DC supply cables. Refit the covers. (Tighten the
screws to 3 N·m [25 lbf·in]).
12. Secure the cables outside the unit mechanically.
13. Ground the other end of the supply cable shield or PE conductor(s) at the
distribution board.
49
51 to 53.
Electrical installation