First Only; Second Only; Auto Bypass; Inferred Load - MERRICK Genetix Safety, Installation, Operation And Maintenance Manual

First Only

Only one load cell, or group of load cells in parallel, is connected and they are
connected to Load Cell Channel 1 on the GCM. This is the most basic level of
functionality with no special features.

Second Only

Same as "First Only" above, except load cells are connected to Channel 2 on
the GCM.
Both
This requires load cells be connected to both GCM load cell channels. The load
will be determined by averaging the inputs from both channels.

Auto Bypass

This requires load cells to be connected to both GCM load cell channels. The
load will be determined by averaging the inputs from both channels, but in
addition, the two channels will be monitored individually and if a difference
greater than the allowable is observed, the Load Cell Function can be observed
to switch to "Bypassed". This assumes that the difference is being caused by a
failure in the weighing system and the load cannot reliably be measured by the
load cells. "Bypassed" is a form of Inferred Load feeding (see below).
While in Inferred Load mode, the load is not being measured but rather is set to
a value that has been established by the Genetix controller based on history, or
can be set by the user. Once the problem is corrected, the controller can be
switched back to gravimetric mode by setting the Load Cell Function back to
"Auto Bypass"
Switching to "Bypassed" also turns the Logical output "Load Imbalance" on.
Typically this is set as a Warning to advise the user that a load balance has
occurred and that the feeder is using Inferred Load for control.

Inferred Load

The user may force the controller to Inferred Load mode if no load cells are
available. The belt load will be fixed and as set by the Inferred Load value (see
Main Menu > Advanced Setup > Load Cells > Numeric Data).
Note: If a Material on Belt switch is enabled (see Main Menu > Advanced Setup
> Configuration > Material on Belt Sw), then the Inferred Load value will be
controlled by this switch. When the switch is on, the load used will be as set by
the Inferred Load parameter, if the switch is off (no Material on Belt), then the
load value will be set to zero.
This feature is most often used for a volumetric belt feeder that does not feed
by weight.
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