Rice Lake 420 Plus HMI Digital Weight Indicator Installation Manual - Manual (Page 35)

420 Plus Installation Manual - Calibration 31
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
* C A L *
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 to exit setup mode.
4.2 EDP Command Calibration
To calibrate the indicator using EDP commands, the
indicator EDP port must be connected to a terminal or
personal computer. See Section 2.3.5 on page 10 for
EDP port pin assignments; see Section 5.0 on page 33
for more information about using EDP commands.
Once the indicator is connected to the sending device,
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 them on the scale for
zero calibration.
2. Send the WZERO EDP command to calibrate
zero. The indicator displays
*CAL*
while
calibration is in progress.
3. Place test weights on the scale and use the
WVAL command to enter the test weight value
in the following format:
WVAL=nnnnnn<CR>
4. Send the WSPAN EDP command to calibrate
span. The indicator displays
*CAL*
while
calibration is in progress.
5. Up to five linearization points can be
c a l i b r a t e d b e t w e e n t h e z e r o a n d s p a n
c a l i b r a t i o n v a l u e s . U s e t h e f o l lo w i ng
commands to set and calibrate a single
linearization point:
WLIN.V1=nnnnn<CR>
WLIN.C1<CR>
The WLIN.V1 command sets the test weight
value (nnnnn) for linearization point 1. The
WLIN.C1 command calibrates the point.
Repeat using the WLIN.Vx and WLIN.Cx
commands as required for additional
linearization points.
6. To remove an offset value, clear all weight
from the scale, including items used to hang
test weights, then send the REZERO EDP
command. The indicator displays
*CAL*
while
the zero and span calibrations are adjusted.
7. Send the KUPARROW EDP command to exit
setup mode.
4.3 Revolution Calibration
To calibrate the indicator using
Revolution
, the
indicator EDP port must be connected to a PC running
the Revolution configuration utility.
Use the following procedure to calibrate the indicator:
1. Select
Calibration Wizard
from the Revolution
tools menu.
2.
Revolution
uploads calibration data from the
indicator then presents the information in the
calibration wizard, as shown in Figure 4-2
Figure 4-2. Revolution Calibration Display
3. Enter the
Value of Test Weight
to be used for span
calibration then click
OK
.
4. The Zero Calibration dialog box prompts you
to remove all weight from the scale. Clear the
scale and click
OK
to begin zero calibration.
Note
If your test weights require hooks or
chains, place them on the scale for zero
calibration.
5. When zero calibration is complete, the Span
Calibration dialog box prompts you to place
test weights on the scale for span calibration.
Place tests weights on the scale then click
OK
.