Main Board Wiring Connections - OHAUS 7000 Serie Guia Del Usuario

2.5.1 Main Board Wiring Connections

Once the T72XW terminal harsh enclosure is open, connections can be made to the terminal strips on the main board, as
shown below.
Load cell
connector
Option 1
connector
Option 2
connector
2.5.2 Analog Load Cell Connections
TO AVOID DAMAGE TO THE PCB OR LOAD CELL, REMOVE POWER FROM THE T72XW TERMINAL AND WAIT AT LEAST 30
Load cell connections are made to the load cell connector located on the main board.
The AC version of the T72XW terminal is designed to power up to ten 350-ohm load cells (or a minimum resistance of
approximately 35 ohms). The battery version of the T72XW terminal is designed to power up to four 350-ohm load cells (or a
minimum resistance of approximately 87 ohms). To confirm that the load cell load for this installation is within limits, the total
scale resistance (TSR) must be calculated. To calculate TSR:
Ensure that the TSR of the load cell network to be connected to the T72XW has a resistance greater than the minimums listed
above before connecting the load cells. If the resistance is below the minimum, the T72XW will not operate properly.
In addition, the maximum cable distance must be reviewed. The table below provides recommended maximum cable lengths
based on TSR and cable gauge.
T72XW Main Board Connections, AC Model
SECONDS BEFORE CONNECTING OR DISCONNECTING ANY HARNESS.
TSR =
WARNING!
Load Cell Input Resistance (Ohms)
Number of Load Cells
EN-3
AC
power
connector
DIP
switches