Appendix B – Using Non-Compumotor Motors
59
Direction of Motor Rotation
The procedures above do not determine the direction of
motor shaft rotation. To find out which direction the shaft
turns, you must power up your system and command
motion. If the shaft turns in the opposite direction than
you desire, exchange the motor leads connected to
A+
and
A–
to reverse the direction of rotation.
CAUTION
Motor shaft rotation may be opposite than you
expect. Do not connect a load to the shaft until you
first determine the direction of shaft rotation.
Setting Motor Current
To set motor current for a non-Compumotor motor, refer
to the formulas below that correspond to your motor (4-
lead, 6-lead, 8-lead) and use the current settings shown on
page 7 to set the motor’s current.
WARNING
Do not connect or disconnect the motor with the
power on. Doing so will damage the contacts of
the motor connector and may cause personal
injury.
4-Lead Motors
If you use a 4-lead motor, the manufacturer’s current
specification will translate directly to the values shown for
current in the DIP switch table on page 7.
6-Lead Motors
If you use a 6-lead motor, and the manufacturer specifies
the motor current as a bipolar rating, you can use the DIP
switch table’s current settings directly (no conversion) to
set motor current.
If the manufacturer specifies the motor current as a
unipolar rating, use the following formula to convert the
unipolar current rating to the correct bipolar rating:
Unipolar Current
∗
0.707 = Bipolar Current
After you make the conversion, use the values shown for
current in the DIP switch table to set the motor current.
8-Lead Motors
Manufacturers generally use either a unipolar rating or a
bipolar rating for motor current in 8-lead motors.
Unipolar Rating: If the manufacturer specifies the motor
current as a unipolar rating:
• Use the following formula to convert the unipolar
current rating to the correct bipolar rating:
Unipolar Current
∗
0.707 = Bipolar Current
• If you wire the motor in series, use the DIP switch
table’s current settings and the converted value to set
the motor current.
• If you wire the motor in parallel, you must double
the converted value and use the DIP switch table’s
current settings to set the motor current.
Bipolar Rating: If the manufacturer specifies the motor
current as a bipolar series rating:
• If you wire the motor in series, use the DIP switch
table’s current settings directly.
• If you wire the motor in parallel, you must double the
manufacturer’s rating and then use the DIP switch
table’s current settings to set the motor current.
If you have any questions about setting motor current,
consult your local Automation Technology Center (ATC)
or distributor, or refer to the numbers listed under
Technical Assistance on the inside front cover of this
document.
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