Rice Lake Static Weighing - Manual (Page 11)

Installation 7
2.2 Leveling
Select a location for the CW-90/CW-90X that is reasonably level and free of vibrations and air currents. Adjust the
four corner feet on the base and refer to the bubble level on the inside frame. The base should not rock and the feet
should have solid contact with the surface. If using a column, adjust the two column feet until they make solid
contact with the support surface.
Note
Ensure the nut on each foot’s bolt is secured flush against the scale base.
2.3 Making Power Connections
The power source used for the CW-90 must be properly grounded to an acceptable earth ground. If the indicator is
remotely mounted, the platform must be separately grounded from the chassis ground screw located on the bottom
of the platform. Connect this screw with 18 gauge wire to the same earth ground system as the AC power source.
Failure to ground the base may cause static buildup and incorrect weights.
Note
The CW-90 must be installed near an easily accessible power outlet to allow for quick disconnect in case of
emergency.
2.4 Enclosure Disassembly
The indicator enclosure must be opened to connect cables for load cells, communications, and digital
inputs/outputs.
WARNING
Before opening the unit, ensure the power cord is disconnected from the power outlet. The power outlet
must be located near the indicator to allow the operator to easily disconnect power to the unit.
Ensure power to the indicator is disconnected, then place the indicator face-down on an antistatic mat. Remove the
screws holding the backplate to the enclosure body, then lift the backplate away from the enclosure and set it aside.
2.5 Load Cell Wiring
On all complete units (indicator head and base), the load cell has been wired to the indicator’s CPU load cell
terminal at the factory. If you have purchased just the indicator head, you must wire the load cell.

Wire the cable to the CPU board’s J1 connector as shown in Table 2-1. Leave any excess cable outside of the
indicator head during installation
Table 2-1. J1 Pin Assignments
J1 Pin Function
1 + Signal
2 - Signal
3 + Sense
4 - Sense
5 + Excitation
6 - Excitation
Note
If using a 4-wire connection, set JP1 and JP2 to ON. If using a 6-wire connection, set JP1 and JP2 to OFF.
2.6 Wire Specifics
Wires connecting to J1, J2, J3, or J4 should adhere to the following specifications:
Table 2-2. Wire Specifications for Connectors
Wire Range Wire Strip Length
28~12 AWG stranded or solid wire 5~6 mm (3/16” ~ 1/4”)