14
Installing the Communications Harness
The communications harness is used if the trip unit
is to communicate with a power management con-
trol system. The communications connector,
included in the trip unit wiring harness, is mounted
with the supplied angle bracket. This bracket has two
small holes on one arm for attaching with screws to
a convenient spot on the breaker frame and a large
rectangular hole in the other arm for mounting the
connector.
The communications connector should be installed
on the breaker on the same side as the breaker
compartment’s door hinge, to protect it from dam-
age when the compartment door is opened or
closed. Attach the supplied caution labels, shown in
Figure 18, to both the breaker and the compartment
door as a warning to disconnect the communications
harness before removing the breaker from the
compartment.
Figure 18. Caution label to be applied to the breaker and
compartment door.
SECTION 5. INSTALLING THE TRIP
UNIT
Use the following procedure to install the trip unit.
1.
Pull out the locking lever on the trip unit mount-
ing plate until it snaps into the open position, as
shown in Figure 14.
2.
Carefully line up the 36-pin connector mounting
pins with the two holes on the sides of the
connector cutout on the rear of the trip unit. The
alignment pin on the rear of the trip unit must fit
through the hole in the locking lever.
3.
Push the trip unit against the mounting plate
until it locks into position. The locking lever will
automatically snap back to secure the trip unit.
Figure 19 shows an installed trip unit.
CAUTION
: Ensure that the trip unit connector is
seated firmly into the 36-pin connector on the
mounting plate. Improper mating of the connectors
will cause damage to the trip unit, wire harness,
connector, and current sensors.
4.
The breaker escutcheon may now be reattached.
To remove the trip unit, slide out the locking lever to
release the alignment pin, then carefully pull the trip
unit straight off the mounting plate.
Figure 19. Trip unit installed on the breaker (LA-800 shown).
