11
Installing the Communications Harness
The communications harness is used if the trip unit is to
communicate with a power management control 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 damage
when the compartment door is opened or closed. Attach
the supplied caution labels, shown in Figure 19, to both
the breaker and the compartment door as a warning to
disconnect the communications harness before removing
the breaker from the compartment.
Figure 19. Caution label to be applied to the breaker and
compartment door
Note: If communications is not required for this
application, install the two pin wire harness (supplied with
the kit) to provide 24V DC to the trip unit. Power supply of
24V DC is essential for advanced functions of the trip unit
such as backlight display, status LED indicator, event log
etc.
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 mounting plate
until it snaps into the open position, as shown in Figure 12.
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 26 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 20. Trip unit installed on the breaker
