Maguire Products WEIGH SCALE BLENDER WSBMB Series, Installation Operation & Maintenance

Page: 100 / 148

M A G U I R E P R O D U C T S , I N C .
100
W E I G H S C A L E B L E N D E R

When looking at errors of percentage of color or additive dispensed, look further.
1. First, look for indications of "retries". Retries are evidence of a problem that will also cause percentage errors.
When FIRST time dispense, (DATA line 3), does not equal FINAL dispense, (DATA line 1), one or more retries have
occurred. This means the hopper ran out of material, or the flow rate is so erratic that the first dispense was short for no
good reason. Parameters _RT and _RP determine what shortage error is necessary to force a retry.
Inconsistent loading resulting in large variations in hopper material level can cause retries.
Excessive vibration can also cause bad weight readings, which can cause unwarranted retries. If the BAILOUT line is
printing occasionally, then vibration is most likely causing this. Increasing the BAILOUT parameter should fix this.
A LAG time set too high may cause retries to overshoot their mark resulting in over dispensing.
2. Second, look at ACTUAL weight dispensed (DATA line 1).
Color, for example, is a percentage of the natural. In the example above, Natural is 1908.3 grams, so color, at 4 percent
of Natural, is targeted to be 76.3 grams. In fact, 77.6 were dispensed. The error is 1.3 grams, well within the expected
accu
racy of a 1” auger feeder.
The actual GRAM error of a dispense is more meaningful then the percentage error. Mechanical devices are not perfect.
The most we can expect from them is to operate within a reasonable range of accuracy. This range is better defined by
an error expressed in grams, rather them percentage.
3. Third, look at the dispense TIME (DATA line 3).
Very short times (10, 20, 30 interrupts) indicate dispense devices not well matched to the task. Accuracy on a percentage
basis, cycle to cycle, will suffer. This may very well be acceptable as long as overall usage percentages are still accurate.
BAILOUT: (line 4)
If bailouts occur, vibration is usually the cause and these bailouts may be causing other problems. Raise the value of the BAL
parameter to 200 or 300 grams to reduce or eliminate unnecessary bailouts.
Vibration may also cause throughput rates to suffer due to the added time requiring to obtain acceptable weight readings. Increase
the WDF parameter to 2 or 3 grams, (WDF 00003) or (WDF 00030), or more if necessary.
Load Cell Calibration - Printout Verification
To print a Load Cell Calibration Printout, insert a flash drive into the controllers USB port (the flash drive requires a folder named
“maguire” to be present). Enter Program Mode (*22222) the press * 8 8. The following document will print to the flash drive.
MAGUIRE WSB WEIGH DOCUMENTATION
MACHINE ID: 7
DATE: 03/18/21
TIME: 17:10:08
DISPLAY READOUT: 4000
This is useful for obtaining printed verification of load cell accuracy for ISO and other international quality program rules.
The recommended procedure is:
1. Place the unit into the Program mode.
2. Press *88 for printout of empty bin TARE weight.
3. Place a KNOWN CERTIFIED WEIGHT into the weight bin.
4. Press *88 again for printout with the weight added.
5. The different between the two weight printouts should equal the KNOWN CERTIFIED WEIGHT.