Mettler Toledo IND246 Guia De Instalacion página 37

2.4.3.1.1. Power Requirements
The AC terminal requires 85 to 264 VAC (at 167 mA maximum) with a line frequency of 49 to 61
Hz and is internally fused at 1.0 amps, 250 volts.
The battery powered terminal operates from 6.8 to 8.3 VDC (at 500 mA maximum).
The POWERCELL terminal requires 85 to 264 VAC (at 750 mA maximum) with a line frequency of
49 to 61 Hz of power. It is internally fused at 1.6 amp, 250 volts.
2.4.3.2. Analog Load Cell Connections
Load cell connections are made to the load cell connector located on the main board as shown in
Figure 2-19.
The AC version of the IND246 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 IND246 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 IND246 has a resistance greater
than the minimums listed above before connecting the load cells. If the resistance is below the
minimum, the IND246 will not operate properly.
In addition, the maximum cable distance must be reviewed. Table 2-3 provides recommended
maximum cable lengths based on TSR and cable gauge.
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analyzer. If adverse power conditions exist, a dedicated power circuit or power line conditioner
might be required.
FOR CONTINUED PROTECTION AGAINST SHOCK HAZARD CONNECT TO PROPERLY GROUNDED
OUTLET ONLY. DO NOT REMOVE THE GROUND PRONG.
TO AVOID DAMAGE TO THE PCB OR LOAD CELL, REMOVE POWER FROM THE IND246 TERMINAL AND WAIT AT
LEAST 30 SECONDS BEFORE CONNECTING OR DISCONNECTING ANY HARNESS.
TSR =
Table 2-3: Recommended Maximum Cable Lengths
TSR (Ohms)
350
87 (4-350 Ω cells)
43 (8-350 Ω cells)
METTLER TOLEDO IND246 and IND246 POWERCELL Installation Manual
WARNING
NOTICE
Load Cell Input Resistance (Ohms)
Number of Load Cells
24 Gauge 20 Gauge
(meters/feet) (meters/feet)
243/800 610/2000
60/200 182/600
30/100 91/300
16 Gauge
(meters/feet)
1219/4000
304/1000
152/500
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