Offset Adjustment; Span Adjustment - Asco JOUCOMATIC SENTRONIC 601 Série Manuel D'installation

ZERO POINT ADJUSTMENT (potentiometer P2)
Example 1 : For having a output pressure to 3 bar at 1 volt set point. Apply 1 volt and turn P2 potentiometer
in clockwise direction to get 3 bar (see adjustment precaution, below).
Example 2 : For a 2 volts set point, output pressure should be 0 bar.
Apply 2 volts setting and turn P2 potentiometer in counterclockwise direction to get 0 bar.
Turn
potentiometer
in clockwise
direction
PMR
SHUT
OFF
0
5 V
10 mA
Offset adjustment potentiometer P2
WARNING : If you turn potentiometer P2 clockwise the maximum output pressure (PMR) may be
exceeded and the valve overdrives. This means that the output pressure cannot be regulated anymore
and the full supply pressure is applied. Therefore, at an increased zero point, the span (P1) must be reduced
to avoid valve overdrive.
In order to avoid damaging the sensor, the supply pressure must always be less than the maximum
input pressure (MAP) defined above.
SPAN ADJUSTMENT (potentiometer P1)
Example : Valve adjustment with PMR of 6 bar.
For a setting range of 0-10 volts, the desired output pressure range should be 0 - 5 bar :
Apply the setting of 10 volts and turn potentiometer P1 counterclockwise to obtain 5 bar
output pressure.
PMR
0,5 PMR
0

Span adjustment

potentiometer P1
The maximum possible adjustment of the span is 100%. To obtain an output pressure value equal to the PMR
(span 100%), there must be a potential difference of at least 10 volts (voltage setting) or 20 mA (current setting).
You can only reduce the output pressure.
Latch up zone
Turn potentiometer in
counterclockwise direction
10 V
20 mA
Turn potentiometer in clockwise direction
Turn potentiometer in counterclockwise direction
10 V
20 mA
Max. pressure Max. pressure
of regulation supply
PMR
MAP
(bar)
(bar)
0,100
2
0,500
2
1
2
3
8
6
12
10
12
12
14
16
18
20
25
*
Max. pressure accept by the sensor
GB
*
15