Rockwell Automation 1519 MV DRIVE HARMONIC FILTER PF CORRECTION UNIT - Manual (Page 25)

Chapter
7
1519-5.0 – May 1998
Troubleshooting and Repair
Troubleshooting Annunciation and action in the event of a harmonic filter fault will vary
depending on the particular drive/harmonic filter system. If the drive input
starter is used as the harmonic filter switching device, then a harmonic filter
fault will have the effect of creating an external fault described as “HF FAULT”
(for Harmonic Filter Fault) on the associated drive. Any fault on the drive
results in opening of the associated input starter, which de-energizes the filter.
This Harmonic Filter Fault will be annunciated on the Panelview operator
terminal under “ALARMS”.
Harmonic Filter Fault
The contacts for reactor overtemperature, SMP-3 blown capacitor fuse
detection, and Bulletin 592 thermal overload are generally wired in series and
any one of these conditions can create a Harmonic Filter Fault. If a Harmonic
Filter Fault occurs then the SMP-3 relay(s) and 592 overloads should be
checked to see if they are in the tripped condition. Both the SMP-3 and the
592 are manually reset relays.
SMP-3 Relay
If an SMP-3 relay has tripped this generally indicates that one or more
capacitors in the harmonic filter have failed in a short-circuit condition. Reset
the SMP-3 relay by pressing its reset push button. For your safety, wait five
minutes before accessing the capacitors to allow them to discharge. Verify
with a hot stick and meter that the capacitors are voltage-free.
The fuses mounted on top of each of the capacitors associated with the tripped
SMP-3 relay should be checked with an ohmmeter for continuity. If a very
high resistance is seen on one or more fuses, this indicates that the fuse has
blown. It is also likely that the associated capacitor has failed. To check a
capacitor an ohmmeter can be connected to the capacitor terminals. If a
gradual change in resistance is seen on the meter then the capacitor is good. If
a very low resistance and no gradual change in resistance is seen this indicates
that the capacitor has shorted internally and must be replaced.
1519-IN050B-EN-P June 2013