4 Commissioning
96 Festo – P.BE-MPA-EN – 1309f – English
– The proportional pressure regulator interprets nominal values which are smaller than
1 % full scale as zero point switch-off, i.e. the valve is force-ventilated and therefore
assumes a defined position.
– If the load voltage is switched off (for example, with EME RG ENCY OFF), the last output
pressure se t of the proportional pressure regulator remains intact. In the medium
term, the pressure at the output can increase or diminish. For the QX variant of the
proport io nal pressure regulator, this mea ns that the last se t pressure is applied at
output 2 of the sub-base. For the QZ variant of the proportional pressure regulator,
the last set pressure in channel 1 applies, i.e. all valves of th is pressure zone are pres-
surized with the last pressure set.
VPPM-…TA-...
Output pressure with
signal 1 % FS
1) 2)
Output pressure with
signal 100 % FS
1) 2)
2bartype 0.02 bar 2bar
6bartype 0.06 bar 6bar
10 bar type 0.1 bar 10 bar
1) FS = Full scale (1 % FS = 0.1 V / 100 % FS = 10 V)
2) 0 V = 0 bar
Tab. 4.8 Output signal of the proportional pressure regulator
Additional important specifications on commissioning th e proportional pressure regulat-
or, such as parameterisation, significance of the LED display, can be found in the MPA-...
electronics description.
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