Cla-Val CPC - Manual (Page 8)

Page 8
Static Calibration (0% - 100%)
The “Set range” allows calibration in either dynamic or static
mode. When the “Set Range” is clicked, the following mes-
sage appears. If you would like to proceed with calibration,
click "OK", if not click "Cancel".
Initial preparation:
It is highly recommended that the valve and actuator as-
sembly is isolated by closing upstream and downstream iso-
lation valves and pressure is removed from valve. If this is
not possible, consult the factory. The objective is to remove
the site plug and visually determine the position of the “orifice
coupling” with respect
to the “stem tube”. They
should be flush with no
gap between the two
assemblies (see Fig.
1). The procedure for
this is shown below:
Orifice coupling
No gap between orifice
coupling and stem tube
0-100% Calibration without System Pressure
1. Isolate and remove pressure from the valve assembly.
2. Remove plug as shown in figure 1.
3. Open e-Drive / CPC Software then go to "Set Range"
tab and click OK on the menu.
4. Select "Static Calibration" Mode and check "CPC
Motor" box is checked and select trim size from the drop
down menu (3).
5. Using the "Increase actuator"/ "Decrease actuator"
Buttons, adjust the position of the “orifice coupling”
until there is no gap (flush) with the stem tube
(See Fig. 1)
6. Select the valve size to be calibrated from the drop
down menu (3) to determine the number of turns
required to achieve full opening of the valve.
7. Select units.
8. Enter 4 mA value and 20 mA value.
9. Turns to low point (1): Enter the number ‘1’.
10.Turns to high point (2): Enter the “Number of turns”
value for the valve selected (4) minus ‘1’.
11. Select "Write Set Range" to upload settings to CPC.
Calibration is complete
Plug
Orifice coupling
Stem tube
No gap between
orifice coupling
and stem tube
Fig. 1
e-line list
OK
You are going to put the e-Drive / CPC in calibration Mode (Led Blinks Red/Green
X
Cancel
(
2)
(
1)
(
4)
(
3)