feeding device can not feed out. The parameter is used in the cleanout by weight state.
Setting this value too low can cause the Cleanout sequence to never run to completion.
The default value is 1 % of the Design Weight. When the weight is below
Empty Weight
,
the logical output
Scale Empty
is On. See Logical Outputs, page 39.
Fill Time
This is the maximum time allowed for the re-fill. When re-fill starts, the controller starts a
timer. If the hopper has not been filled to the
Fill Weight
, or taken out of the Re-fill State
by a Stop Fill command, a Logical Output
Slow Fill
will turn on. This output can be set to
qualify a Warning or a Fault, informing the operator that there is a material handling
problem. The controller remains in the Re-fill state even if the fill time exceeds this limit.
Clean Time
In the Cleanout state, the feeder will run until the
Empty Weight
is reached. If the empty
weight is not reached within
Clean Time
, the logical output
Slow Cleanout
is turned on.
The time starts when the Cleanout command is accepted.
Start of Cleanout
Empty Weight
Empty Time
Cleanout Time
W
e
i
g
h
t
Empty Time
This is an extra time that the feeding device will run after the
Empty Weight
has been
reached during Cleanout. When the weight in the hopper drops below the
Empty
Weight
, the controller starts a timer. When the
Empty Time
is reached, the controller
turns off the
Fdr Drive Enabl
logical output, and zeroes the Speed Demand Signal.
Fill Gt Time
This parameter should be set to the time it takes for the fill gate above the hopper to
close and material to finish falling and stabilizing in the hopper. The purpose is to avoid a
situation where batching starts too early after a fill. If the logical input
Fill Gt Closed
is
used with a fill gate limit switch, it has to indicate Closed within this time. If the input fails
to turn on within this time, the logical output
Fill Gt not Cls
goes ON. It can be used to
qualify a Warning.
Vibrator Time
The logical output
Vibrator
goes on at the beginning of Fast Feed and during the
Cleanout by Time states. To avoid material packing in the hopper, the output only stays
on for
Vibrator Time
during the Fast Feed state.
Stability Settings
The parameters are used to set stability criteria for weight. They are crucial for the
accuracy and performance. All batching sequences start and end with taking the stable
weight of the hopper. The more stringent the stability criteria, the more accurate the
batch totals, and the slower the batching.
For the weight to be considered stable, the weight indication must stay within the
Stable
Span
for a certain number of weigh samples (
Stable Sampls
).
Stable Time
This is maximum time the calibration and batching procedures will wait for weight
stability. If the time is exceeded while calibrating, the calibration procedures will fail.
35.00.EX O&M Manual
27
Summary of Contents for MC3 35.00.EX
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