Symmetrically constructed grounding conductors inside a VFD shielded cable: Twist
together, combine with the shield and connect under the drive's ground terminal and
under the motor's ground terminal. For a conduit installation see 2.
4
External brake resistor connection (if used). For a conduit installation: See 1 and 2.
For a VFD cable installation: See 3 and 4. In addition, cut the third phase conductor
which is not needed for the brake resistor connection. See chapter Resistor brak-
ing (page 243).
5
External brake chopper (if used). See chapter Resistor braking (page 243).
6
If necessary, install an external filter (du/dt, common mode, or sine filter). Filters are
available from ABB.
7
Note: All openings in the drive enclosure must be closed with UL listed devices having the
same Type rating as the drive Type.
￭
Connection procedure
The procedure of connecting the power cables to the standard drive is described
below.
1. To remove the R3 front cover (R6 and R8 upper front cover), lift the cover from
the bottom outwards (1a) and then up (1b).
R3 – UL Type 12R3 – UL Type 1
To remove the R6 and R8 lower front cover, slide it downwards (3a) and then
forward (3b). For UL Type 12 frame R8, disconnect the power supply wire of
the auxiliary cooling fan.
Electrical installation – North America (NEC) 121
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