Conditioned Power Center
32
Section 8 - Troubleshooting/Maintenance
8.1.4 Harmonic Filter Circuit Breaker Trips Out
If equipped with a harmonic filter option, the power conditioner will incorporate a
passive harmonic filter. One characteristic of such filters is that they tend to
“sink” harmonics regardless of whether the source is the load or the facility. In
some circumstances, it is possible that the load and the facility together may
require more reactive current than the filter is rated to provide. For that reason,
models equipped with the harmonic filter option include a circuit breaker to
pretect the filter from delivering reactive current current in excess of its capabili-
ties. The circuit breaker is located on the front panel as illustrated in Figure Q to
the left. The circuit breaker will trip if its reactive current capabilities are exceeded. The circuit breaker may be
reset at any time without interrupting the operation of the power conditioner. However, unless the source of ex-
cessive harmonics is located and eliminated, the circuit breaker is likely to once again trip as soon as it has been
reset. If tripping of the harmonic circuit breaker is frequent and persistent, this is an indication of high harmonic
content within the facility electrical system which could be investigated and corrected.
Little routine maintenance is required for the CPC series to function reliably for many years. Depending on the
application for which the power conditioner is being used, however, occasional routine cleaning may be recom-
mended. Some applications and installation environments generate significant dust residue. This may be espe-
cially true in printing facilities. Because the CPC series is convection cooled, it is important to prevent dust
buildup from blocking the ventilation slots. Dust buildup should also be removed from inside the power c ondi-
tioner enclosure. Dust may be easily removed with any ordinary shop vacuum. Remove dust as often as re-
quired to keep ventilation slots clear and excessive dust from accumulating inside the enclosure.
To perform maintenance inside the enclosure, it will be necessary to de-energize the power conditioner as de-
scribed in Section 6.5 and remove the side panels as described in Section 5.3. Make sure to observe Section 6.1
carefully when completed before returning the power conditioner to service.
Figure Q