Field Flux Tuning - Allen-Bradley 1395 Troubleshooting Manual

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5-4 Manually Tuning the 1395 Drive

Field Flux Tuning

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KP - KP can be adjusted by observing the drives current feedback signal at
Test Point 2 on the Main Control Board. With the system running at set
speed, adjust KP until uneven current pulses are observed (greater than
250mv variance in pulse to pulse height).
KI/KF - KI can be adjusted by making small step response tests to the
system. If machine dynamics require a prescribed accel/decel rate, 'run the
drive from zero speed to about 1/4 speed and vice versa.If possible, link
parameter 106 (velocity feedback) to an analog output and observe the
machine or motor shaft for movement.If overshoot exists or an excessively
long period is required for the shaft to stop, adjust KI until minimal
overshoot exists. If overshoot cannot be totally removed, adjust KF to attain
the desired response.
This procedure involves setting up the Field Flux Table (parameters 677
through 684) and the rated motor field current (parameter 612) based on the
actual motor characteristics.
1. Record the value of the field flux reference (parameter 676) and the field
economy reference (Parameter 674) below:
Parameter 674 _________
Parameter 676 _________
2. Set the field flux reference and the field economy reference to 100%
Important: The drive start command must remain true for the entire
time the test is being performed. If a stop command is issued
anytime during the test, the motor will stop and the test will
be aborted. Check parameter 624 (maintain start) to
determine if the start command is latched or momentary.
3. Start the Drive and run it at the same speed as specified by parameter
699.
4. Select the Field Flux Tune option using the programming terminal.
5. The Field Flux tuning will begin. It takes approximately 5 to 60 seconds
for the test to complete, at which time the program terminal will indicate
that the test has been completed.
6. Set the field flux reference and the field economy reference back to their
original values as recorded in step 1.
ATTENTION: Failure to set the field economy reference back
!
to its original value may cause damage to the motor field. Certain
motors will not tolerate full field while at zero speed for
prolonged periods of time.
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