13.2 Setting for 3- / 4- wire system 4 - 20 mA
.
Connect voltage to AUMA VARIOMATIC.
.
Move valve to end position CLOSED.
.
Remove switch compartment cover and, if installed, pull off
indicator disc as described under clause 8, page 11.
.
For actuators with measuring points not accessible from the
outside, remove cover plate (figure O).
.
Connect ammeter for 0 - 20 mA to measuring points (figure N,
page 15 or figure O).
The circuit (external load) must be connected (observe
max. ext. resistance R
B
), or the appropriate poles at the
AUMA plug/socket connector must be linked (refer to
wiring diagram C IS...KMS 14TP...), otherwise it is not
possible to measure a value.
.
Turn potentiometer (R2) clockwise to initial position.
Turn potentiometer (R2) whilst decreasing output signal until stop is felt.
.
Turn trimmer potentiometer (N) clockwise, until output current starts to
increase.
.
Turn back potentiometer (N), until a rest current of approx. 0,1 mA
is reached.
.
Move valve to end position OPEN.
.
Set to end value 16 mA with trimmer potentiometer (M).
.
Move valve to end position CLOSED.
.
Set potentiometer (N) from 0,1 mA to initial value 4 mA.
This results in a simultaneous shift of the end value by 4 mA, so that the
range is now 4 - 20 mA.
.
Approach both end positions anew and check setting. If necessary,
correct the setting.
.
In case cover plate (figure O) has been removed, fit anew.
.
If applicable, press indicator disc on shaft and perform setting as
described under clause 11, page 14.
.
Clean sealing face, check O-Ring, apply a thin film of non-acidic grease to
sealing face.
.
Fit and fasten switch compartment cover.
If the maximum value is not reached, the selection of the
reduction gearing must be checked.
13.3 Inverse operation
For inverse operation exchange the connections 7 (red/RD) and 5
(black/BK) at positioner board (figure N, page 15).
17
Multi-turn actuators SARV 07.1 - SARV 10.1
Operation instructions
AUMA VARIOMATIC
