Fairbanks H90-5200-A Digital Instrument - Manual (Page 19)

b. providing inputs to a process controller that is controlling an automatic
batching process, where the batching controller is providing the intelligence
to control the valves or gates.
MODE 2- CHECKWEIGH MODE
Display shows “SP CH”.
The checkweigh mode is used to determine if a weight is under, within or over a
programmed weight range.
The setpoint outputs operate as follows:
SP1 = Overrange(On when weight> Setpoint 1)
SP2 = Accept range(On when Setpoint2 <= weight <=Setpoint 1)
SP3 = Under range(On when weight < Setpoint 2)
Checkweigh outputs are active immediately upon startup and are always on except for
any programming which interrupts the weight monitoring process.
START, TRIM, and STOP keys are not functional in this mode. Preact, discharge and
zeroband options are available.
MODE 3- MANUAL BATCH MODE
Display shows “SP bA”.
The batch mode is used to control simple filling operations where gates or valves are
controlled by the setpoint outputs and an operator is manually controlling the sequence
of operation. The setpoint outputs are controlled by the START, TRIM, and STOP keys.
In the batch mode, the setpoints may be set up as one to four FAST FEED outputs
with optional PREACT, or one or two paired setpoints with FAST FEED and DRIBBLE
outputs, with optional PREACT.
When the START key is pressed, the outputs will be enabled (“Setpoint Enabled” LED
is lighted) assuming the setpoint inhibit function is satisfied or disabled. The active
setpoint output(s) will be ON if the absolute value of the weight is less than the
CUTOFF VALUE. When the absolute value of the weight exceeds the CUTOFF
VALUE, or the STOP key is pressed, the setpoint output will turn OFF. If all setpoints
are OFF, the “Setpoint Enabled” LED will turn OFF and the active setpoint indicators
will light. The TRIM key can be used to momentarily turn ON an individual setpoint
output. If outputs are paired, the TRIM key will only operate on the dribble setpoint of
the selected pair. When the TRIM key is released, all setpoint outputs will turn OFF.
Another batch of the same ingredient can be released by pressing the START key
again.
A new ingredient can be batched by pressing the STOP key until the SP indicator for
that ingredient is lit and then pressing the START button.
50515 19 Issue #2 4/04