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8
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ENCODER EQUIPPED MOTORS
The encoder connections must be run in a shielded cable. There
are seven connections to the encoder. When the motor thermal is
run in the 24VDC or 48VDC control circuit, it may also be run in
the cable (except on the 320 frame motors where the thermal
connections are not in the same junction box). A cable such as
BELDEN
part #9539 may be used.
®
A connection diagram is supplied with each motor control. The
shield should be connected at the drive end at TB1 terminal 1.
The shield on the motor end should be connected to the terminal
strip in the motor at terminal 10. DO NOT GROUND THE
SHIELD AT ANY POINT. If there are junction boxes between the
motor and the control, install a terminal to continue the shield
through the junction box.
ENCODER ALIGNMENT PROCEDURE
If a motor has been disassembled, the encoder must be lined up
again so that it is properly aligned with the magnets on the rotor
and the windings of the stator. Also, if the encoder has been
replaced, adjustment of the assembly is necessary.
There are two types of feedback assemblies. F1 encoders are
used for motors with the junction boxes mounted on the left side of
the motor (facing the drive end with the feet down) and for motors
with junction boxes on the right side of the motor near the back. A
top mounted box uses the F1 assembly.
F2 assemblies are for older motors motors with the junction box
on the right side of the motor near the drive end. These encoders
are for replacement use only.
PROCEDURE
1.
The encoder feedback assembly mounts in the back of the
motor. The hole in the end bell on the junction box side locates
the cable breakout point from the feedback assembly. An end bell
mark shows the notch location.
2.
After the feedback assembly is mounted, but before the
magnetic wheel is mounted on the shaft of the rotor, it is
necessary to align the rotor with the stator. The connections on
© copy right 2012 by P O WE R TEC Industrial Motors, Inc
POW ERTEC "F" Series Motor Manual
the power leads must be made according to the nameplate (see
Page 3). Start with the keyway of the motor shaft in the 12 o'clock
position (up) with the motor standing on its feet.
3.
The alignment of the rotor may be done on small motors by
attaching any battery (such as a 9 volt cell) to the power leads.
The positive terminal should be connected to the T1 lead of the
motor, and the negative terminal of the battery should be
connected to the T2 lead of the motor. The rotor will move to the
nearest pole. Do not leave the battery connected or it will quickly
be drained.
On larger motors, the Genesis Series motor control may be used
to align the rotor. Turn off the motor control and turn the current
limit (both current limits on a regenerative drive) potentiometer(s)
fully counter-clockwise. Disconnect the wires on the motor
control at TB1 terminals 2, 3, and 4. Connect a jumper wire from
TB1 terminal 16 to TB1 terminal 3 on the motor control. Turn
on the motor control; give it a speed command of about 10% , and
turn the current limit (motoring) up about 30°. The motor will align
to the nearest pole. Return the motor control to its proper
connections and adjustments.
With an LED box or meter on the diode scale, put the encoder
wheel on the shaft with the white mark near the cable breakout
and turn the wheel on the shaft to obtain the following results (on
the meter, an on sensor will have a low impedance):
F1 Junction Box F2 Junction Box (old motors)
HS1
ON
HS2
OFF
HS3
Changing
When this condition is obtained, fasten down the encoder
magnetic wheel on the shaft with the two set screws (90° apart)
on the hub. The motor should now be aligned within 3° of its
rotation to the stator.
OFF
ON
Changing
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