
2408
i Indicator Engineering Manual
3.6.3
Load Cell Calibration
A load cell with V, mV or mA output may be connected to Input 1 or Input 2.
Figure 3-4: Load Cell Calibration
3.6.4
To Calibrate a Load Cell
The load cell is calibrated as follows:
1.
Set
<
ScL.L
>
and
<
ScL.H
>
for the required ‘zero’ and ‘span’ readings on the display
2.
Remove any load and start the procedure using the low point calibration parameter
<
Pnt.L
>
3.
or a digital input wired to this parameter. The indicator will calculate the low calibration point
4.
Place a reference weight on the load cell and turn on the high point calibration parameter
<
Pnt.H
>
, or a
digital input wired to this parameter. The indicator will then calculate the high calibration point.
Note:-
If
<
Pnt.L
’= ‘On’,
<
Pnt.H
>
cannot be turned to
<
on
>
If
<
Pnt.H
’= ‘On’,
<
Pnt.L
>
cannot be turned to
<
on
>
Either must complete before the other can be set to
<
on
>
First enter the calibration password
as described in section 3.6.2.
Then:-
Do This
This Is The Display You Should See
Additional Notes
Load Cell
Reference Weight
Indicator under Calibration
PV input 1
AC
AA
AB
VI
V- V+
LA
LC LB
3A
2C
2D
3B
3D
3C
1C
1A
1B
1D
2B 2A
HC
HA
HB
H
HF HE
JC
JA
JB
JD
JF JE
Transducer
supply 1
+
-
This diagram shows connections to input
1/main input
If Input 2 is used in module position 3, the
transducer output can be connected to
terminals 3C (+) and 3D (-)
The indicator will show ‘busy’ while
calibrating
If the calibration fails the alarm
message
<
tdr.F
>
is flashed
9.
Press
to show
<
Pnt..L
>
10.
Press
or
to turn
calibration to
<
on
>
buSY
on
Pnt.L
Set the load cell to its ‘zeroed’ condition
When the calibration low point is complete, place the reference load on the load cell
The indicator will show ‘busy’ while
calibrating and will flash
<
done
>
when complete
If the calibration fails the alarm
message
<
tdr.F
>
is flashed
11.
Press
to show
<
Pnt..H
>
12.
Press
or
to turn
calibration to
<
on
>
buSY
on
Pnt.H
The
<
Pnt.L
>
and
<
Pnt.H
>
parameters
may have been wired to digital inputs for
activation by external switches
The operation is identical except that the
indication will return to the display which
was being shown prior to the activation of
the switches
6.
Press
to scroll to
<
ScL.L
>
7.
Press
or
to enter the
scale low value (normally 0)
8.
Repeat for
<
ScL.H
>
ScL.L
0
This sets the minimum (zero) display
reading when the transducer has its
lowest weight
Set the required display ‘Span’ and ‘Zero’ parameters
This sets the maximum (span) display
reading when the transducer has its
highest weight
Part Number HA027240 Issue 5.0 Feb 2015
29
Содержание 2408i
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