Sine Wave 2-8 kHz Series A Filter
27 Part No. INSTR-020 REL. 080310
7 Wiring Connections
WARNING
Input and output wiring to the filter
should be performed by authorized
personnel in accordance with NEC and
all local electrical codes and
regulations.
Verify that the rating of the filter is compatible
with the inverter to which it is to be connected.
Follow all detailed inverter manufacturer
installation and safety instructions. Inverter and
load Cable selection / placement should be in
accordance with the requirements of the NEC
and all local electrical codes and regulations
The typical interconnection diagrams that
follow are shown for a motor load but the load
can be either a motor or a transformer. For
enclosed filters supplied in general purpose
NEMA1 and 3R cabinets and open panel filters
rated less than 80 amperes, interconnection
between the filter, motor and the inverter is
shown in Fig. 15
Refer to the inverter user
manual for instructions on interconnecting the
inverter and motor and the correct start-up
procedures for the inverter. The sine wave
filter is primarily designed to operate from a
drive using the volts per Hertz mode. For drive
auto-tune or feedback using the motor consult
the drive manufacture for setting the drive with
output filters.
For power supply / frequency converter
applications using a PWM inverter, the output of
the Sine wave must feed a Delta- Wye isolation
transformer to accommodate the effects of load
imbalances and to cancel tripplen harmonics. See
Fig. 17
for details.
The filter is designed for use with copper
conductors with a minimum temperature rating
of 75 degrees C. Table 7
lists the wire range
and terminal torque requirements for the power
input and output connections.
For panel mounted filters rated 80 amperes or
more, the filter reactor is supplied loose and
the RC network is supplied as an RC panel
assembly. Refer to fig. 16
for a typical
interconnection diagram. To select appropriate
conductors for the wiring between the reactor
and the RC panel refer to table 8
. Table 7
contains the terminal specifications for these
connections.
Use the cable recommended by the inverter
manufacturer to connect the inverter to the
filter and the filter to the motor. Make certain,
that the selected cable size conforms to the
requirements of the National Electric Code and
all local codes.
For open filters refer to Fig. 3
through 5 for the
location of Input, output, and ground
connections. For enclosed filters, ground
terminals will be clearly marked. Power wiring
terminations are clearly marked on the reactor.
Larger enclosed filters require power for the
fans. A terminal for 115 VAC 50/60 Hz fan
power is also provided for connecting to clean
customer power. See table 10
for fan wiring.
Grounding
The filter must always be grounded with a
grounding conductor connected to ground
terminals.
For cable shield grounding follow the inverter
manufactures recommendations. Fig 15
& 16
shows a typical shield ground connection.
Optional Over Temperature Interlock
The optional over temperature interlock
can be used to turn off the inverter in the
event it is setup to operate with a switching
frequency outside of the range of the filter
or an inverter / motor malfunction. The
temperature switch is normally closed and will
open when an internal reactor temperature of
180 °C is reached. See
table 9 for contact
rating information and the inverter user
manual for interconnection information.
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