Analog Load Cell Connections - Mettler Toledo IND560 Guia De Instalacion

Power Requirements
The terminal requires 85 to 264 VAC (at 750 mA maximum) with a line frequency
of 49 to 61 Hz of power and is internally fused at 1.6 amp, 250 volts. The fuse is
located adjoining the main power connection on the main board as shown in
Figure 2-17 and Figure 2-18. Should the fuse blow, always replace the fuse with
the same voltage and amperage as specified and have a qualified electrician test
the power supply for correct operation as described in the IND560 Technical
Manual, Chapter 4.0, Service and Maintenance, the troubleshooting section.

Analog Load Cell Connections

TO AVOID DAMAGE TO THE PCB OR LOAD CELL, REMOVE POWER FROM THE IND560
TERMINAL AND WAIT AT LEAST 30 SECONDS BEFORE CONNECTING OR DISCONNECTING ANY
HARNESS.
When using an analog load cell version of the IND560, load cell connections are
made to the connector located on the main board as shown in Figure 2-17.
The IND560 terminal is designed to power up to eight 350-ohm load cells (or a
minimum resistance of approximately 43 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:
TSR =
Ensure that the TSR of the load cell network to be connected to the IND560 has a
resistance greater than 43 ohms before connecting the load cells. If the resistance
is less than 43 ohms, the IND560 will not operate properly.
In addition, the maximum cable distance must be reviewed. Table 2-2 provides
recommended maximum cable lengths based on TSR and cable gauge.
Table 2-2: Recommended Maximum Cable Lengths
TSR (Ohms)
(meters/feet)
350
87 (4-350 Ω cells)
43 (8-350 Ω cells)
A jumper is provided that adjusts the gain of the analog section for 2 mV/V or
3 mV/V load cells. The factory default position of this jumper is 3 mV/V. Normally
this position will work well for both 2 mV/V and 3 mV/V load cells. If 2 mV/V load
cells are used, the jumper can be changed to the 2 mV/V position. Refer to Figure
2-53 for the jumper position. Removal of the plastic cover over the main board is
necessary to gain access to this jumper.
IND560 Installation Manual
WARNING!
Load Cell Input Resistance (Ohms)
Number of Load Cells
24 Gauge 20 Gauge
(meters/feet)
243/800 610/2000
60/200 182/600
30/100 91/300
16 Gauge
(meters/feet)
1219/4000
304/1000
152/500
2-13