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4.3.6 Filter
Capacitors
4B75 Case
In order to access the capacitors the DIN Rail mounting bracket will need to be removed, see instructions above
for removal of the DIN Rail mounting bracket. After the bracket is removed, disconnect the wires connecting to
the capacitors. Remove the three bolts holding the circular capacitor mounting brackets. Remove the
capacitors from the mounting brackets. Installation is the reverse of removal.
WARNING: Be sure to
maintain proper polarity.
475 Case
In order to access the capacitors the bottom panel will need to be removed, remove the four bolts that secure
the panel. The AC and DC Breakers need not be removed. In the 475 Case capacitors can be mounted in one
of two ways.
In the first style of mounting the capacitors are held in place with circular mounting brackets and may also be
connected with bus bar. To replace capacitors, disconnect the wiring to the capacitors (and bus bar if
applicable) and then remove the three bolts holding the mounting brackets. Installation is the reverse of
removal.
WARNING: Be sure to maintain proper polarity (both with the individual capacitors as well
as the bus bars) when reconnecting the capacitor wiring.
The second style of mounting the capacitors are mounted on a metal plate near the bottom left of the case.
Remove the three bolts holding the plate. At this point both the shunt and resistor will need to either be
removed from the plate, or all wiring from the shunt and resistor needs to be disconnected. (If the wiring is
disconnected be very careful to reconnect the wires in the correct places). The capacitors are held in place
both by a set of bus bars, as well as being zip tied to the plate. Before removing the plate, disconnect the wires
that tie into the capacitor bus bars. Remove the screws from the bus bar and cut the zip ties to replace each
capacitor, be sure to install a new zip tie. Installation is the reverse of removal.
WARNING: Be sure to
maintain proper polarity (both with the individual capacitors as well as the bus bars) when
reconnecting the capacitor wiring.
975 Case
The capacitors are mounted to bus bars, which are held in place by an insulated “dogbone” that is mounted to
the baseplate. In order to access the capacitors the Heat Sink Assembly will need to be removed. Remove the
Heat Sink Assembly using the instructions above. After removing the Heat Sink Assembly, disconnect all wires
that are tied to the capacitor bus bars. The capacitors can then be removed by removing the nuts securing the
“dogbone.” After pulling the capacitor assembly from the unit, the individual capacitors can be replaced by
removing the screws from the bus bars. Installation is the reverse of removal.
WARNING: Be sure to
maintain proper polarity (both with the individual capacitors as well as the bus bars.)
72 Case
The capacitors are mounted to both sides of the case. C3 which consists of eight capacitors is on the right side
and C4 which consists of four capacitors is on the right side. Remove the top cover by removing the five bolts.
After the top cover is removed, disconnect all wires that are tied to the capacitor bus bars. The capacitors can
then be removed by removing the nuts securing the “dogbone.” After pulling the capacitor assembly from the
unit, the individual capacitors can be replaced by removing the screws from the bus bars. Installation is the
reverse of removal.
WARNING: Be sure to maintain proper polarity (both with the individual
capacitors as well as the bus bars.)
