Sterlco SGBD Series Batch Gravimetric Blenders - Manual (Page 70)

BLN1-600A Chapter 4: Operation 70 of 116
Continue/Stop Running if Mixer Fails
If the blender is configured with the “Mixer Failure Detection” option then the user can select
if he wants the blender to alarm only or stop if the mixer movement is not detected during
mixing.
Alarm Messages
An alarm message will be shown if any alarm condition occurs. A message will pop up on
the screen until the alarm condition is resolved. During an alarm condition, not only will a
visual alarm show up on the screen but also an audible alarm will sound. The operator can
press “OK” on this pop-up to hide the screen temporarily, but if the alarm condition is still
unresolved, then the message and horn will reappear after a short delay.
The blender will log when the alarm event occurred and when the condition went away.
The following is a list of all alarm names and descriptions:
Hopper 1-8 Out of Material: This alarm indicates that a hopper is out of material and
signals the operator that they should check the resin system.
Hopper 1-8 Low Level: This alarm indicates that a hopper with a low level prox sensor is
low.
Surge Hopper Empty: This alarm indicates that the surge hopper sensor is sensing a low
level. This can be any surge hopper and not necessarily related to the blender. It is a
customer specified alarm input.
Mixer Failure: This alarm indicates that mixer movement was not detected when it was
suppose to be. This is only available if the Optional “Mixer Failure” feature has been added
to the blender.
Unable to Make Rate: This alarm indicates that the blender has not hit high level in an
appropriate amount of time.
Hopper 1-8 Unstable Alarm: This alarm indicates that a hopper has not stabilized. This is
determined by examining the last 3 feed calibration measurements while the blender is
running. If the 3 measurements are within a set deviation of each other than the hopper is
“stable” and these measurements are used to average the feed calibration value. If not then a
counter is increased every batch and the feed calibration value remains unchanged. After a
set amount of batches that are not “stable” then an alarm is given.
Hopper 1-8 Overfeed Alarm: This alarm indicates that a hopper has put too much into the
current batch.
Max Hopper Weight Exceeded, check batch size: This alarm indicates that the weight in
the weigh hopper has exceeded the maximum allowed weight. This alarm can happen if the
operator changes material density and does not perform a feeder calibration, but will usually
be automatically fixed after the first batch. As long as this alarm doesn’t continue to
reappear, then the operator should not be concerned. If the alarm continues to occur, then the
operator should have maintenance check the blender.
Calibration Error, Clean out hopper and check calibration: This alarm indicates that the
maximum empty weight for the weigh hopper has been exceeded. The blender will
automatically tare up to 0.25 lbs of material, but if this weight is exceeded, then an alarm will
appear. This alarm is most commonly caused by a build up of sticky material in the weigh
hopper and can be corrected by simply cleaning out the weigh hopper. If this does not correct
the problem, then the scale calibration should be checked by maintenance.