Rockwell Automation 1395 DC Drive, 800-1250 Hp, FRN 5.XX-9.30 - Manual (Page 183)

Chapter 6
Start–Up
6-18
Velocity Loop System Test – This procedure calculates the system inertia
(param. 703), maximum bandwidth (param. 701). If these values are
known they can be entered directly and you can proceed to the Field Flux
Tuning procedure.
1. Connect the motor to the machine.
2. Select the Velocity System Test (Drive Setup/Autotune/Vel Sys
Test) option on the program terminal.
IMPORTANT: The Drive start command must be 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.
ATTENTION: The Velocity Motor Test closes the Drive contactor
and operates the motor up to speed specified by Param 699.
3 . Start the Drive when requested to do so by the program terminal.
The motor (and load) will begin to accelerate to the speed specified
by parameter 699 (Auto Tune Speed) at the armature current
specified by parameter 698 (Autotune I Lim). When it reaches that
speed, it will begin to decelerate to zero speed.
NOTE: If the test fails on a motor stalled (VP-18) or Profile
Timeout
(VP-50) the Auto Tune I Limit (param 698) may be set too low.
Increase the value of Parameter 698 and run the test again.
When the test is complete, the Drive contactor will drop out and the
program terminal will indicate the status of the test.
4. If the test was successful, continue to the Velocity Loop Tuning
Procedure, otherwise refer to the Troubleshooting Manual.
The test just performed writes the value of parameters 703 and 701
when option to save in EEPROM is executed.
Velocity Loop Tuning – This procedure tunes the velocity loop of the
Drive based on the information supplied by the Motor and System tests.
1. Select the Velocity Loop Tune option (Drive Setup/Autotune/Vel
Tune) on the program terminal.
2. The program will display the maximum bandwidth possible and
allow you to de-tune the loop from there. Enter a new bandwidth
or press ENTER to accept the current value.
3. The Drive will now calibrate the velocity loop gains and return the
status of the tuning procedure.
4. If the tune was successful, continue to the Field Flux Tuning
Procedure,otherwise refer to the troubleshooting manual.
The test just performed writes the value of parameter 659, 660 and
700 when option to save in EEPROM is executed.