Electrical installation 65
Connection procedure
See the cabling drawings with tightening torques for each frame size on pages 68.
1. Frame sizes C and D only: Remove the two plastic connector covers at the top
and bottom of the drive. Each cover is fastened with two screws.
2. On IT (ungrounded) systems and corner grounded TN systems, remove the
screws labeled VAR (located close to the supply terminals on the power unit) to
disconnect the internal varistors.
WARNING! If a drive whose varistors/filters 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 connects to the ground
potential through varistors/filters of the drive. This may cause danger or damage the
drive.
If a drive whose varistors/filters 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 67), 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 supply cable to the U1, V1 and W1
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.
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: 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.
10. Cover visible bare shield and pigtail with insulating tape.
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