Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual - Manual (Page 188)

Publication 1398-5.2 – PDF 1997
11-6 Maintenance and Troubleshooting
Motor Overspeed 18 OVERSPEED parameter in
the drive set to low for the
application Using ULTRA Master (refer to
Drive Parameters section) set
Overspeed parameter to an
acceptable range for the appli-
cation.
Motor commanded to run
above Overspeed setting Reduce command from posi-
tion controller or change veloc-
ity parameter in the position
controller.
Motor encoder phasing is
incorrect Check encoder phasing.
Excess Following Error 19 The software position error
limit was exceeded Increase the feed forward gain
to 100%.
Increase the following error
window (refer to
ULTRA Master Drive Parame-
ters section).
Retune the drive to reduce the
following error.
Increase the slew limit window
(refer to ULTRA Master Drive
Parameters).
Motor Encoder State
Error 20 The motor encoder encoun-
tered an illegal transition Replace the motor/encoder
Use shielded cables with
twisted pair wires.
Route the feedback away from
potential noise sources.
Check the system grounds.
Bad encoder Replace motor/encoder.
Auxiliary Encoder state
error 21 The auxiliary encoder
encountered an illegal transi-
tion Use shielded cables with
twisted pair wires.
Route the encoder cable away
from potential noise sources.
Bad encoder - replace encoder
Check the ground connections
Motor Thermal Protection
Fault 22 The internal filter protecting
the motor from overheating
has tripped. Reduce acceleration rates
Reduce duty cycle (ON/OFF)
of commanded motion.
Increase time permitted for
motion.
Use larger drive and motor.
IPM Thermal Protection
Fault 23 The internal filter protecting
the IPM at slow speed has
tripped. Reduce acceleration rates
Reduce duty cycle (ON/OFF)
of commanded motion.
Increase time permitted for
motion.
Use larger drive and motor.
Excess Velocity Error 24 Velocity exceeded allowable
range. Increase time or size of allow-
able error.
Reduce acceleration.
Table 11.1: Troubleshooting Guide (continued)
Problem or Symptom Error
Code Possible Cause(s) Action/Solution