13.1 Setting for 2-wire system 4 - 20 mA and 3- /4-wire system 0 - 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).
In end position CLOSED of 3- or 4-wire system, the value after
setting is 0 mA, for 2-wire system it is 4 mA.
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 trimmer potentiometer (N), until a residual current of
approx. 0,1 mA (or 4,1 mA in case of 2-wire system) is reached. This
ensures that the signal remains above the dead and live zero point.
.
Move valve to end position OPEN.
.
Set to end value 20 mA with trimmer potentiometer (M).
.
Approach end position CLOSED anew and check minimum value (0 mA
or 4 mA). 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.
16
Multi-turn actuators SARV 07.1 - SARV 10.1
AUMA VARIOMATIC
Operation instructions
Cover plate
Measuring
point 2 (–)
0/4 - 20 mA
Measuring
point 1 (+)
0/4 - 20 mA
R2
N (0/4 mA)
M (20 mA)
Figure O