Mettler Toledo IND780 Manuel D'installation page 53

The open collector outputs are TTL compatible, current-sinking components which
can handle from 5 to 30 volt DC signals at a maximum of 35 mA current. A solid-
state relay or OPTO 22 is typically connected to buffer the IND780 terminal outputs
to a 120 or 220 volt AC signal. This output is reserved for use only with the scale's
material transfer target functionality. It provides the signal for the feed output
associated with the active target for that scale.
POWERCELL Connections
TO AVOID DAMAGE TO THE PCB OR LOAD CELL, REMOVE POWER FROM THE IND780
TERMINAL AND WAIT AT LEAST 30 SECONDS BEFORE CONNECTING OR DISCONNECTING
ANY HARNESS.
The POWERCELL option board should be placed in slot 1 on the main board, and
its ground wire attached to the screw indicated in Figure 2-27 and Figure 2-28.
The POWERCELL option is used with Mettler Toledo DigiTOL® POWERCELL, MTX
or RAAD box load cells used in large tank and vehicle weighing applications.
Figure 2-39 shows a POWERCELL option board.
Figure 2-39: POWERCELL Option Board
Figure 2-40 shows the connections for this board.
Figure 2-40: POWERCELL Option Board Connections
IND780 Installation Manual
WARNING!
Voltage and Terminating
Resistor Setting Jumpers
2-25