Rockwell Automation 20P PowerFlex Digital DC Drive - Manual (Page 101)

Rockwell Automation Publication 20P-UM001I-EN-P - February 2013 101
Drive Start Up Chapter 2
16. For permanent magnet motors only, continue with Tune the Current
Regulator for a Permanent Magnet Motor on page 101 . For all other
motors, continue with Configure the Speed Feedback Parameters on
page
102 .
Tune the Current Regulator for a Permanent Magnet Motor
Only complete this procedure when you are using a permanent magnet
motor.
1. Verify that Par 414 [Fdbk Device Type] is set to 3 “Armature” (default).
2. Set the value of Par 453 [Arm Resistance], calculated as:
(Par 175 [Rated Motor Volt] / Par 179 [Nom Mtr Arm Amps]) x 0.04
3. Leave Par 454 [Arm Inductance] set to the default value (based on drive
size).
4. Verify that there is no material or process load present and the motor
shaft is free to rotate.
5. Start the drive and run the motor at approximately 50% of base speed.
Observe the value of Par 587 [I Reg Err] after it has settled to a value and
do one of the following.
• If Par 587 [I Reg Err] is positive, increase the value of Par 454 [Arm
Inductance]. The magnitude of change will be determined by the
value of Par 587. Generally, make large increases (for example,
double) when Par 587 is large (greater than 40) and smaller
increases as Par 587 gets closer to zero.
• If Par 587 [I Reg Err] is negative, decrease the value of Par 454 [Arm
Inductance]. The magnitude of change will be determined by the
value of Par 587. Generally, make large increases (for example,
double) when Par 587 is large (greater than -40) and smaller
increases as Par 587 gets closer to zero.
6. Repeat step 4 above until Par 587 [I Reg Err] is as close to zero as
possible. Values less than 20/-20 are acceptable as close to zero. However,
with some motors, the minimum value of Par 587 may only be 60/-60.
Stop the drive and continue with Configure the Speed Feedback
Parameters on page
102 .
ATTENTION: Prior to tuning the current regulator, you must provide a hard
wired maintained external operator accessible coast/stop push button to
disable the machine in case of improper operation. Uncontrolled machine
operation can result if this is not done. Failure to observe this precaution
could result in severe bodily injury or loss of life.
ATTENTION: Prior to tuning the current regulator, remove any material or
process load that may be damaged by rotation of the motor or speed
references.