22
AC Motor Leads
The AC motor in the drive is connected like any other
polyphase induction motor. As required by the National
Electric Code (NEC) and/or other applicable codes, it is
necessary to provide appropriate disconnect, control and
protective devices for the motor. These devices and the
motor conductors must be sized, applied and installed in
conformance with the NEC and/or other applicable codes.
Consult the instructions provided with these devices for
additional information. All motor leads at the conduit box
are gray or black. The motor nameplate and/or a decal
near the nameplate show how to connect three phase
power to the motor leads. Most motors are dual voltage
(nine leads), but motors for single voltage (three leads)
and multiple voltage (twelve leads) are sometimes used.
Typical Wiring Connections
Figure 3-7
The motor nameplate lists the full load current for each of
the rated supply voltages. Size the motor conductors in
accordance with the full load current at the selected
voltage.
Clutch and Brake Coil Leads
The coil leads for the clutch and brake (if furnished) is
connected to a terminal block inside the conduit box
located above the output shaft. The clutch coil leads are
white, and the terminals are marked C1 and C2. Leads
from either an eddy-current or friction brake are orange
and the terminals are marked B1 and B2. Connect the
wires to terminals C1, C2, B1 and B2 in the eddy-current
controller. Size the wires in accordance with the coil
voltage and current ratings listed on the clutch nameplate.
Refer to Section 8 of this manual for additional information
regarding eddy-current and friction brakes. Refer also to
the diagrams and instructions furnished with the eddy-
current controller.
Tachometer Generator Leads
The tachometer generator leads are connected to the
same terminal block as the clutch and brake leads
described above.
Three tachometer generator leads are brought out to the
conduit box in a shielded, insulated cable. Two of these
leads are connected to terminals G1 and G2 according to
maximum output speed as shown in Table 3-6. The leads
are factory connected to suit the drive's nameplate RPM
and should not need to be changed.
It is necessary to connect a shielded cable from the
generator terminals in the conduit box to the controller
and to any tachometer indicator that may be used. The
shielded cable should consist of a twisted, insulated pair
of conductors having a continuous metallic shield around
them with an insulating jacket over the shield.
In the conduit, cut back enough of the end of the shielded
cable to expose sufficient conductor lengths to make
required connections then tape the exposed shield to
prevent grounding. In the controller enclosure, strip off
enough of the outer jacket to expose several inches of
shield. Expose enough conductor to make required
connections. Unbraid the shield, twist the strands together
to form a conductor and attach it to the ground post just
below the terminal strip. Be careful to keep this ground
conductor away from other terminals on the terminal strip.
Shielded cable should only be grounded at one end,
preferably the controller end.
Tach Generator Leads
Table 3-5
Maximum Output
RPM
Use Leads:
1200 or less
Black and white or yellow
Between 1200 and 1800
Red and white or yellow
When shielded cable is used, generator leads may be run
in the same conduit as other conductors but not with the
incoming power leads to the motor. If you prefer to not use
shielded cable, run a twisted pair through separate
conduit with no other conductors.