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Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 6
Troubleshooting
Adequate Performance Notes
1. Drive Integrity Check
a. Is the Motor spinning?
b. Is it the mechanical brake releasing?
c. Is the motor wired correctly?
– Use a megger meter to confirm wiring. Disconnect motor from the
drive and use a megger meter to test the motor and check the
electrical continuity within the motor, this is a special type of
ohmmeter used to measure the electrical resistance of insulators.
2. Flux Vector Open Loop Check should yield a speed regulation of +/-
rpm of set point. If not, determine whether the drive startup procedure
was followed:
00:25 [Motor NP Volts]
,
00:31 [Motor Poles]
,
00:75
[Flux Current Ref ]
,
00:76 [Total Inertia]
.
a. If
00:76 [Total Inertia]
is too high, then the gains might be too high.
00:76 [Total Inertia]
and
00:636 [Speed Reg BW]
create
00:645
[Speed Reg Kp]
/
00:647 [Speed Reg Ki]
of the speed loop. Values
that are too high create instability. Look at
00:690 [Limited Tqr
Ref ]
and
00:945 [At Limit Status]
for instability.
b. Check ratio of
00:75 [Flux Current Ref ]
/
00:26 [Motor NP
Amps]
(Flux/Motor nameplate current)
– Use this link to refer to Knowledgebase articles
.
Label 3
Label 4
Steps:
Check the last fault code
00:951 [Last Fault Code]
.
You must address the fault or change parameter /
program to ignore if possible.
Example: Universal feedback device, change
xx:09
[FB0 Loss Cfg]
from 2 (Fault Minor) or 3 (FltCoastStop)
to 0 Ignore.
Continue
Continue
Go to Label 3
Go to
.
Attempt to jog
from any start source.
Does it run adequately?
Refer to Note
.
Does it run
without faults?
No
No
Yes
Yes
