Rice Lake 520 HMI Digital Weight Indicator Installation Manual - Manual (Page 47)

41 520 Indicator Installation Manual
4.1 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 4-1). Press to go to zero calibration
(
WZERO
).
3. Standard Calibration: 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
).
Millivolt Calibration: To enable millivolt
calibration, set MVCALIB=ON on the
PROGRM
menu (see Section 3.2.5 on page 30).
Once enabled, press to display and edit
millivolt value at zero weight (see Figure 4-2
on page 41), press again to calibrate and
display raw A/D count, press the third time
to move to the next selection.
4. With
WVAL
displayed, press to display the
stored calibration weight value. Use the
procedure shown in Figure 4-2 to enter the
actual value of the test weights to be used for
the span calibration. Press to store the
entered
WVAL
value and advance to the next
prompt (
WSPAN
).
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Figure 4-2. Editing Procedure for Numeric Values
5. With
WSPAN
displayed, place test weights on
the scale and 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 to
store the span calibration value and advance to
the next prompt (
WLIN
).
Millivolt Calibration: If millivolt calibration is
enabled, press to display and edit millivolt
value at span weight, press again to calibrate
and display raw A/D count, press the third
time to move to the next selection.
6. Five-point linearization (using the WLIN
parameter) provides increased scale accuracy
by calibrating the indicator at up to five
additional points between the zero and span
calibrations.
Linearization is optional: if you choose not to
perform linearization, press the right arrow and
you will keep scrolling through the menu
choices. When complete, use the up arrow to
exit. If linearization values have previously
been entered, these values are reset to zero
during calibration. To perform linearization,
follow the procedure below:
Standard Calibration: With
WLIN
displayed,
Press to go to the first linearization point
(
PT-> 1
). Place test weights on the scale and
press or
ENTER
.
Use the procedure shown in Figure 4-2 to enter
the actual test weight value, then press to
calibrate. The indicator displays
*CAL*
while
calibration is in progress. When complete, the
A/D count for the linear calibration is
displayed. Press again to save the calibration
value and go to the next prompt (
PT-> 2
).
Repeat for up to five linearization points. To
exit the linearization parameters, press to
return to WLIN.
Millivolt Calibration: If millivolt calibration is
enabled press to display and edit the test
weight value, press again to display and edit
the millivolt value for that weight, press
again to calibrate and display the raw A/D
count, press again to move to the next
calibration point.
7. 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 all weight
removed, press to rezero the scale. This
function adjusts the zero and span
calibration values. The indicator displays
*CAL*
while the zero and span calibrations
are adjusted. When complete, the adjusted
A/D count for the zero calibration is
displayed. Press to save the value, then
press to return to the CALIBR menu.
8. Press until the display reads
CONFIG
, then
press so that the display reads
WAIT
, and
returns back to weigh mode.