Rice Lake Farm Bars - U Series Universal Weighbars - Manual (Page 10)

6 U Series Farmbars Operator’s Manual
5.0 Maintenance
The most common type of problem that can occur is the load is not supported completely by the farmbar pads.
Check around and under the weigh apparatus to see if any debris has collected near the scale. Any ice, dirt, mud or
manure that builds up can cause inaccurate readings. The scale should be kept clean to ensure proper operation.
It should also be noted that an excess of debris on top of the scale could cause problems. Depending on the type of
scale you have, there may be a limited range of weight you can zero off the scale. Always keep the build up of
material on top of the scale to a minimum.
Lubrication of the bearings in your scale is also important. The bearings are located in the bearing collar, as shown
in the parts list diagram, see Figure 4-1. Inject grease into the bearings using a syringe at least once every two
years. Use a quality, high-pressure grease to lubricate the bearings completely. Do not use an excess of grease – it
should lubricate the bearing without bleeding around the foam seal.
5.1 Calibration
All load cells are calibrated at the factory to reduce installation errors. Over the course of time, however, the load
cells may drift out of calibration slightly. Normally when a scale's load cells go out of calibration, the digital
indicator is adjusted to compensate for this.
The U Series farmbars can be calibrated using the indicator front panel, EDP commands, or the Revolution
®
configuration utility. Each method consists of the following steps:
• Zero calibration
• Entering the test weight value
• Span calibration
• Optional rezero calibration for test weights using hooks or chains.
The following sections describe the calibration procedure for each of the calibration methods.
XXXXXXX XXXXXXX
WZERO
*CAL*
Display and edit
zero calibration
A/D count value
Display and edit
test weight value
WVAL
*CAL*
Display and edit
span calibration
A/D count value
WSPAN
VERS PROGRM PFORMT SERIAL CALIBR CONFIG FORMAT
Press Enter to
remove offset from
zero and span
calibrations
REZERO
*CAL*
Figure 5-1. Calibration (CALIBR) Menu
Front Panel Calibration
To calibrate the indicator using the front panel, do the following:
1. Place the indicator in setup mode (display reads
CONFIG
) and remove all weight from the scale platform.
If your test weights require hooks or chains, place the hooks or chains on the scale for zero calibration.
2. Press until the display reads
CALIBR
(see Figure 5-1). Press to go to zero calibration (
WZERO
).
3. With
WZERO
displayed, press to calibrate zero. The indicator displays
*CAL*
while calibration is in
progress. When complete, the A/D count for the zero calibration is displayed. Press again to save the
zero calibration value and go to the next prompt (
WVAL
).
4. With
WVAL
displayed, place test weights on the scale and press to show the test weight value. Use the
numeric keypad to enter the actual test weight, then press to save the value and go to span calibration
(
WSPAN
).
5. With
WSPAN
displayed, press to calibrate span. The indicator displays
*CAL*
while calibration is in
progress. When complete, the A/D count for the span calibration is displayed. Press again to save the
span calibration value and go to the next prompt (
REZERO
).
6. The rezero function is used to remove a calibration offset when hooks or chains are used to hang the test
weights.
•
If no other apparatus was used to hang the test weights during calibration, remove the test weights and
press to return to the CALIBR menu.
• If hooks or chains were used during calibration, remove these and the test weights from the scale. With