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Selection of the preset value with comparison of
target/actual value
Clamping pressure monitoring with fixed tolerance range
• A plc defines the preset value of a proportional valve. The clamping
pressure of a workpiece is thus controlled.
• The pressure sensor detects the set pressure and compares it with
the preset value.
• The sensor signals a value above (output 1) and below (output 2)
the given tolerance range (± 1 bar).
• The preset values are between 0 and 60 bar; the control voltage is
between 0 ... 10 V.
Wiring diagram:
→
→
example 3, page 26
.
32
Display: Dmod = P1: applied pressure / actual value is displayed.
Dmod = P2: valve pressure / preset value is displayed.
Dmod = P1-2: difference between preset value and actual value is displayed.
SP1 = 1
OU1 = Hno
Output 1 is to switch (= ON) when the valve pressure is more
than 1 bar above the preset pressure.
InP2 = U
The plc controls the valve pressure by a voltage signal.
ILP2 = 0
IHP2 = 10
The voltage range for the valve control is between 0 and 10 V.
IEP2 = 60
The plc changes the preset value on the proportional valve from 0
to 60bar.
SP2 = -1
OU2 = Hnc
Output 2 is to switch (= ON) when the valve pressure is more
than 1 bar below the preset pressure.
Note: the hysteresis (rP2) has to be taken into account.
IEP2 = 60
1
60
0
60
P2[bar]
P1[bar]
-1
selection of the preset value (0 ... 60 bar)
above the line output 1 is switched
below the line output 2 is
switched