Mettler Toledo MT User's Guide download pdf (Page 55)

IND780 User’s Guide

Material Transfer Applications

If the target comparison of the IND780 will be used to control the flow of material,

the application can be classified as a Material Transfer application. These types of

applications are usually automated but can also be manual. A single or two-speed

feeding system is used to either add weight to or remove weight from the scale.

The terminal monitors the change in weight and compares it to a previously

entered target and other control parameters.

Table 2-5 defines some terms used in Material Transfer applications.

Table 2-5: Terms used in Material Transfer applications

Term Explanation

Abort

After a target comparison process has been paused, it can be totally

stopped by pressing the Abort softkey

under the Target Control

softkey

or by triggering a Target Pause discrete input. If abort is

selected, the target comparison process is aborted.

Coincidence

Outputs

A coincidence output is always active and does not require a start or

stop signal. If the weight on the scale is below the target minus the

spill value, the outputs are “on”. If the weight is above the target

minus the spill value, the outputs are “off”. This type of output

typically requires external logic to provide the required control for

feeding systems.

Concurrent

Outputs

This describes the operation of the feed output in a 2-speed feeding

system. If the feeder type is programmed as concurrent, both the fast

feed and feed outputs are active at the beginning of a target

comparison. When the weight reaches the point at which a slower

feed is to occur, the fast feed output is turned off.

Fast Feed

Output

This refers to the physical output connection that is used for the faster

feed in a 2-speed feeding system. This output is not used in a single

speed feeding system.

Feed Output

This refers to the physical output connection that is used for the

slower feed in a 2-speed feeding system or the only feed output in a

single speed feeding system.

Fine Feed

The value entered for the amount of material that will be fed in the

slower rate of feed in a 2-speed feeding system. This value and the

spill value are subtracted from the target to determine the point that

the fast feed output turns off.

Independent

Outputs

This describes the operation of the feed output in a 2-speed feeding

system. If the feeder type is programmed as independent, the feed

output does not turn on until the fast feed output turns off. Only one

feeder output is active at a time. It is the opposite of concurrent

outputs.

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Mettler Toledo MT User's Guide Page 55

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