MSI-4260 IS Port-A-Weigh
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5.3 Initial Calibration
Use this procedure only if the capacity and count-by (d) need to be modified. The initial calibration erases user setup as well as
any previous calibration.
Use the following steps to perform the initial calibration procedure.
1. Turn the MSI-4260 IS off.
2. Remove the hex seal screw using the steps in
3. Press the Cal switch and the Power switch on the unit simultaneously.
displays.
4. Press
to reset the calibration constants.
displays.
5. Press
to complete the reset.
displays.
6. Press
to start the initial calibration.
displays.
7. Press
to select the calibration unit.
8. Press
to choose between lb and kg and then press
.
9. Press
to enter the capacity setting. A capacity of 10000 is the initial value and should not be set higher than
the load cell rated capacity.
10. Press
to change the capacity. The first digit on the display blinks.
11. Press
to scroll through the numbers and then press
when the desired number displays.
12. Press
to store the capacity value.
displays.
13. Press
to begin the scale divisions. Press
to scroll through the recommended scale divisions.
14. Press
when the desired scale division displays.
displays indicating that the scale is ready for calibration.
15. Follow the standard calibration procedure in
) to calibrate the MSI-4260 IS.
5.4 Guidelines for Capacity and Resolution
Crane scales are subject to forces that regular floor scales do not see. Many bridge cranes, hoist cranes and mobile cranes lack
rigidity and tend to bounce or swing when loads are lifted. For this reason, Rice Lake Weighing Systems recommends that the
resolution is kept in the 1:2000 to 1:3000 range. Some improvement in stability can be achieved by increasing the filtering.
Never program the resolution higher than needed. If the
MSI-4260 IS
display is never stable, it is recommended that the
resolution is reduced and/or filtering increased.
Due to Legal for Trade requirements and general scale design criteria, the weight must be stable for certain features to work:
• ZERO – the weight must be stable to be zeroed
• TARE – the weight must be stable to be tared
• TOTAL – the weight must be stable to be added to the total registers
One way to improve the stability is to increase the filtering, at the risk of increasing settling time. The other is to increase the ‘d’
(reduce resolution). The third way is to increase the Motion Window. The MSI-4260 IS defaults to ±1d as a motion window. It
can be changed at Rice Lake to a higher value if desired. Often ±3d is chosen for bridge cranes as these tend to have a lot of
bounce to them. This of course carries an accuracy penalty adding ±3 d to the total accuracy of the scale if the zero or tare
operation happens to capture the weight in a valley or peak.
Setting capacity is dictated primarily by the capability of the load cell. Rice Lake supplies the MSI-4260 IS in many capacities.
Never set the capacity of the scale higher than the rating of the load cell.
Due to excellent linearity of the MSI S-Beam load cell, it is acceptable to set lower capacities to better match the crane that the
MSI-4260 IS is used on. For example, if the hoist is rated for 9000 lb, then use a 10000 lb. weight and reset the capacity to 9000
lb. Use the Initial Calibration procedure for this calibration. De-rating as much as 50% of the capacity is usually acceptable, but
the scale may be less stable if the d is decreased.
Due to kg to lb conversions, the capacity of all
MSI-4260 IS systems is rated approximately 20% higher than the rated capacity
in pounds. This is to allow the kg capacity to be exactly 1/2 the number of the pound capacity.
TARE
T
TARE
T
TARE
T
TARE
T
USER
F
TARE
T
TARE
T
USER
F
USER
F
TARE
T
TARE
T
TARE
T
USER
F
TARE
T
IMPORTANT
