Rockwell Automation WebPak 3000 DC Drives Hardware Reference, Installation and Troubleshooting - Manual (Page 41)

Drive Setup and Adjustment 3-9
3.6 Verify the Correct Direction of Motor Rotation
ATTENTION: If tachometer and/or rotation is incorrect, sudden and rapid
acceleration may result which can cause overspeed of the drive.
Failure to observe this precaution could result in bodily injury.
Power up the Drive
1. Apply AC power to the drive after you complete the Power Off Inspection, Motor Ground
Check and Drive Setup procedures .
2. See the OIM instruction manual for the displays during power-up.
Turn power to the drive OFF.
1. Verify the operation of the Coast/Stop pushbutton using an ohmmeter. When pressed, the
ohmmeter should read infinite ohms (open); when released, the reading should be 0 (short).
2. Turn power to the drive ON.
3. After power-up, select ARMATURE VOLT for FEEDBACK SELECT (P.200) by taking the
following path from the main menu to access this parameter:
Speed/Voltage Loop (SPD)

 Speed/Voltage Loop (SPD) Feedback
4. Initiate a JOG Fwd command to verify that the motor is rotating in the desired direction.
5. If the direction of rotation is incorrect, stop the drive and then disconnect and lockout or tag
power to the drive.
6. To change the direction of motor rotation, reverse the connection of the motor armature
leads 1C and 1D.
Important: Wrong rotation direction can be caused by incorrect wiring of the field (3C and 3D).
3.7 Determine the DC Tachometer Lead Polarity
1. Turn power to the drive ON.
2. After power-up, select ARMATURE VOLT for FEEDBACK SELECT (P.200) by using the
following path from the main menu to access this parameter:
Speed/Voltage Loop (SPD)

 Speed/Voltage Loop (SPD) Feedback
Refer to the WebPak 3000 Software Reference Manual (D2-3444) for more information on
changing parameter values.
3. Initiate a JOG Fwd command.
4. Use a voltmeter on the tachometer leads to determine the lead polarity for the Forward
direction of rotation. Label the tachometer leads accordingly, (+) and (-).
5. Verify that the (+) tachometer lead is connected to terminal 21 or 22, and that the (-)
tachometer lead is connected to terminal 23. If the (+) tachometer lead is not connected to
terminal 21 or 22, stop the drive. Disconnect and lockout or tag power to the drive. Reverse
the connection of the tachometer leads.