Procedure - ABB ACSM1 Hardware Manual

50

Procedure

Cabling drawings with tightening torques for each frame size are presented on
pages
1. Frame sizes C and D only: Remove the two plastic connector covers at the top
2. On IT (ungrounded) systems and corner grounded TN systems, disconnect the
WARNING! If a drive 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 will be connected to earth potential through the varistors
of the drive. This may cause danger or damage the drive.
If a drive whose varistors are not disconnected is installed on a corner grounded TN
system, the drive will be damaged.
3. Fasten the two cable clamp plates included to the drive (see page 52), one at
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 supply cable to the U1, V1 and W1
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.
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
12. Secure the cables outside the unit mechanically.
Electrical installation
53 to 55.
and bottom of the drive. Each cover is fastened with two screws.
internal varistors by removing the screw labelled VAR (located close to the
supply terminals on the power unit).
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.
terminals of the drive.
Connect the phase conductors of the motor cable to the U2, V2 and W2
terminals.
Connect the conductors of the resistor cable (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.
Note: Try to work out a compromise between the length of the pigtail and the
length of unshielded phase conductors as both should ideally be as short as
possible.
to accommodate the supply and motor cables. Refit the covers. (Tighten the
screws to 3 N·m [25 lbf·in]).