Emerson P/N 400361-00 manual Simple Servo Motor Phasing Test, tunEx trips

2.6Simple Servo Motor Phasing

Test

When connecting a non-standard servo motor to the Unidrive SP, it is necessary to know the wiring configuration of the motor. At times, all of the necessary wiring documentation for connecting the motor is not readily available from the motor manufacturer. In that case, it may be possible to follow the simple servo motor phasing test described below. This will help to determine if the motor phases (U, V, and W) are wired correctly along with the encoder commutation and channel signals. If the procedure described below is followed, and you still have problems, please refer to the Unidrive SP User Guide for further wiring information.

Begin by entering the motor peak current, continuous current, number of poles, encoder lines per rev., etc. Then follow the steps below.

Step 1: Verify wiring of encoder channels per the documentation. Define CW rotation of the motor shaft, from the flange side, with increasing counts.

To verify this, do the following

ADisable the drive

BNavigate the keypad to display parameter # 3.29

CTurn the shaft clockwise and verify that the encoder counts increase from 0 to 65535

DIf the counts decrease, the encoder A and B channels should be swapped

ERepeat A through C of Step 1

Step 6: Verify wiring of motor power cables. Define CW rotation of the motor with a positive drive command. The phasing test of the Unidrive will give a CW rotation during the test.

To verify this, complete the following steps:

AEnable the drive.

BVerify that the motor is free of any load.

CNavigate the keypad to display parameter #0.40.

DSet the parameter to 1. The phasing test will command the motor to move one rev CW. It will also reset the parameter to 0.

EIf the motor moves in the CCW direction, the motor power is wired incorrectly.

FSwap the U and V phases and repeat A through D of Step 2.

Note

Disregard any encoder phasing trip at this time

[tunEx trips]

Step 7: Verify wiring of commutation signals. The Unidrive SP Advanced User Guide section 3 (parameter 3.25) is helpful for this step.

If no trips were encountered during Step 2, this step can be skipped.

To verify correct commutation, follow the steps below:

AEnable the drive.

BNavigate the keypad to display parameter #0.40 and set the parameter to 1.

CIf an tunE3 or other tunEx trip results, rewiring is needed.

DSwap the U and V commutation signals at the drive end.

Repeat steps A through C to verify.

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