Eurotherm 3204i, User Manual

Page: 41 / 140

Part number HA029005. Issue 2.0 May-06. 39
5.3.2 Load Cell Calibration
Connect a load cell as shown below:-
If a 6-wire load cell is used the –ve Sense should be
connected as shown above to the Cal 1 terminal. The
+ve sense wire is not connected.
If the load cell is 4-wire connect Cal 1 to the –ve
supply, preferably at the load cell.
This wire compensates for voltage drop in the supply
to the load cell due to lead resistance.
1. In level 2, press

until LO.CAL is shown in
the lower display
2. Remove all weight from the load cell and press
▲
or
▼
to select
yes
3. The indicator will show
busy
as it calibrates
the zero weight condition.
pass
or
faiL
will
be indicated when the low point calibration is
complete.
4. Now add a weight which represents the full
scale span of the load cell
5. Repeat the above to calibrate the high point –
HI.CAL.
Output -
Load cell
Signal
+
-
N L 3D 3C 3B 3A LC LB 2B 2A 1B 1A
- +
32h8i/SG Indicator
Cal
1
Cal
2
Ext
-
Ext
+
HE HD HF AC AB AA
Txdcr
Supply
Load
- +
L
N
Fuse
Supply -
Sense -