4. Commissioning
4-18
Festo P .BE-MPA-EN en 1108e
4.6 Com missioning instructions for the propor tional pressure regulator
Note
– Make sure there is sufficient space for the connecting
elements. In this way you will prevent the connecting
cable from being bent.
– Make sure that the proportional pressure regulator is
not subjected to high-frequency irradiation
(e,g, by radio sets, mobile telephones or other devices
which cause interference). In this way you will avoid
increased tolerances in the output pressure
(compare specifications on EMC in Appendix A).
– The proportional pressure regulator interprets nominal
values which are smaller than 1 % full scale as zero point
switching off, i.e. the valve is force-ventilated and
therefore assumes a defined positi on.
– Pressurise the proportional pressure regulator with an
input pressure at least 1 bar higher than the maximum
required output pressure. A proportional output
pressure P2 sets itself as the nominal value. Tab. 4/8
shows the output pressure which is assigned to the end
ranges (1 % FS or 100 % FS) of the nominal value.
– When switching off the proportional pressure regulator,
make sure that first the supply pressure, then the supply
voltage is switched off.
– If the load voltage is switched off (for example, with
EMERGENCY OFF); the last set output pressure of the
proportional-pressure regulator remains intact. In the
medium term the pressure at the output can increase or
diminish. Fo r the QX variant of the proportional-pressure
regulator, this means that the last set 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 this
pressure zone are pressurized with the last pressure set.
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