Commissioning
Servitec 35-120 with Touch controller — 06.07.2016 - Rev. B
English — 37
7.2
Setting the minimum operating pressure for Magcontrol
The "p
0
" minimum operating pressure is determined by the location of the pressure maintaining device. The controller calculates the
switching points for the "PV" overflow solenoid valves and the "PU" pumps from the minimum operating pressure.
Description
Calculation
p
st
Static pressure
= static head (h
st
)/10
p
0
Minimum operating
pressure
p
a
Initial pressure (pump
"ON")
= p
0
+ 0.3 bar
Static pressure
(overflow solenoid
valve "CLOSED" /
Pump "OFF")
p
e
Final pressure
(overflow solenoid
valve "OPEN")
≤ p
Sv
- 0.5 bar (for p
Sv
≤ 5.0 bar)
≤ p
Sv
x 0.9 (for p
Sv
> 5.0 bar)
p
Sv
Safety valve actuation
pressure
= p
0
+ 1.2 bar (for p
Sv
≤ 5.0 bar)
= 1.1 x p
0
+ 0.8 bar
(for p
Sv
> 5.0 bar)
