Connecting The Motor; Motor Leads; Motor Ground - PowerTec 2000C Instruction Manual

Figure 14: Input fuses and transformer fuse holders for the Models 2000C.
causing the peak voltage to be significantly less than it
should be. This is usually caused by a service which is not
stiff enough to supply the connected capacity or by external
line impedances which cause excessive voltage drops in
the feeders.
A service which supplies the 2000C or 3000C as
well as AC induction motors must be capable of supporting
the starting current of the motors without dropping more
than 5%.
The power source also must be capable of support-
ing a current limit condition for short periods without
pulling down the input voltage below the low voltage
threshold. Otherwise trips will occur.

4.3 CONNECTING THE MOTOR

4.3.1 MOTOR LEADS

A wiring card for STANDARD CONNECTIONS is
supplied with every drive shipped from the factory. It
shows how to connect the Brushless DC motor to the motor
control. It is vitally important that the connections to the
motor be made properly.
Figure 13 on page 4-2 is a reproduction of the card.
Figure 14 is a drawing of the power input fuse area of the
Model 2000C. The Model 3000C arrangement is similar,
but with larger fuses.
The wires to T1, T2, and T3 on the control must be
connected to the corresponding connections of the motor.
If these wires are not in the proper order, the motor will not
operate. If any of these connections should open up, the
motor will run erratically, if at all.
© copyright 1992, 1996 by Powertec Industrial
Motors
The motor leads marked T1, T2, and T3 will always
connect to T1, T2, and T3 on the control, although the other
motor wires connected with T1, T2, and T3 at the motor
will vary with the connection of the motor windings.There
may be other wires connected to T1, T2 and T3 at the
control, such as Dynamic Braking wiring, if the DB option
is installed.

4.3.2 MOTOR GROUND

A ground connection may be picked up at any bolt
or screw in the motor junction box, and this ground
connection needs to be run to the control with the motor
power wires and connected to the same ground as the
control's ground. The control ground must be connected to
earth ground as close as possible to the power ground.
THIS GROUND WIRE MUST BE RUN IN
ADDITION TO THE GROUNDING OF THE
MOTOR FRAME TO ITS MOUNTING.
The purpose of this separate ground is to equalize the
potential between the motor's frame and the control chas-
sis. Though the motor may be grounded to its mounting
frame, and the frame may be connected to a ground, there
may be enough impedance between the motor and the
control chassis to broadcast EMI and RFI. A direct wire
connection between the motor frame and the drive chassis
will minimize the effects of RFI and EMI.
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