Load Cell Connection - Cardinal 748 Technical/Operation Manual

For desk mounting of the 748 in the NEMA 4X enclosure, it is necessary to order separately a
"DESK-MOUNT" kit. Refer to Assembly Instruction for Desk-Mount Kit (8539-M097-O1) for mounting
instructions.
The Model 748 in a NEMA 4X enclosure is normally mounted on the wall or some other vertical
surface. The enclosure is attached to the wall with four (4) bolts. Refer to Figure No. 7 for the hole
layout for the NEMA 4X enclosure.
figure no. 7 - NEMA 4X enclosure
mounting hole layout
First make certain that the location chosen is free from sudden changes in temperature and that the
mounting surface is strong enough to support the enclosure while being close enough to provide the
operator easy access to the keyboard. Carefully layout the mounting hole locations then drill and
install the anchor bolts. Attach the enclosure to the wall and securely tighten the retaining bolts.
Continue by opening the front cover on the instrument enclosure. Loosen all four (4) retaining
screws and rotate each of the clips to the side. DO NOT remove these screws. Fully open the front
cover of the instrument exposing the internal printed circuit board.

LOAD CELL CONNECTION

CAUTION! Disconnect any external load cell power supply before connecting load cells to
the instrument. Failure to do so will result in permanent damage to the instrument.
Loosen the cable gland connector for the load cell. This gland connector is located on the bottom of
the enclosure on the right-hand side. Refer to figure no. 10 for an illustration of the connector layout.
Slip the single cable from the load cell or load cell junction box through the gland connector and into
the enclosure. Remove 2" of the outer insulation jacket then remove 1/4" of insulation from each of
the four (4) wires and shield without sense leads or six (6) wires and shield with sense leads (refer
to figure no. 8). Connect each of the wires to terminal block P1 as shown in figure no. 11. To
terminate a wire, first press down on the release bar for the terminal, insert the wire into the terminal
figure no. 8 - terminal
block connections
2"
1/4"
NEMA 4X ENCLOSURES
6.0"
14.0"
0.312"
Terminal
5
Dia
opening then allow the release bar to return to
its original position, locking the wire in place.
Repeat the procedure until all of the wires are in
place. NOTE! If the sense leads are NOT used,
you must install plug-in jumpers at J1 and J3
adjacent to the terminal block. These jumpers
attach the sense leads to the excitation leads. If
sense leads ARE used (as in motor truck
scales), these plug-in jumpers should be
positioned on one plug-in pin only or removed
and stored for later use.
8.6"