Mettler Toledo MT Operations Instructions download pdf (Page 5)

Dispensing functions

Operating instructions 22012836B 09/08 5

IND690-Fill

1.3 Dispensing system

With feed valves or feed chutes controlled with coarse and fine feed, the dispensing

sample is automatically infed up to the specified target value.

The control signals for the feed valves are transmitted to the 8-690 relay box via the

RS485-690 interface. The 8-690 relay box controls the dispensing system either

directly or via an additional external control unit (PLC). In the case of overloading or

underloading of the weighing platform, all valves are closed immediately.

A maximum of two 8-690 relay boxes can be connected. With a second relay box a

dispensing system with below-level dispensing can be controlled without a PLC

("nozzle control"). The IND690-Fill then assumes the function of a control unit with

the moving of a filling nozzle or the switching of a drip pan and outputs signals to the

nozzle correction, pregasing and postgasing.

The IND690-Fill can be remote controlled with "electronic fingers". These electronic

fingers trigger various keys via interface commands on the terminal, see section

Alternatively to the relay box 8-690 the dispensing system can also be controlled by

using the interface 4I/O-690 and relay box 4-690 or by using ARM100.

Please note that the accuracy of the filling results and the filling speed are not only

dependent on the scale, but also on the other system parts, and in particular on the filling

device itself (valves, feed chutes etc.). Only the optimum co-ordination of all

components with each other produces the best filling results.

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Mettler Toledo MT Operations Instructions Page 5