Page – 82/139 AFFZP0BB – ACE3 – User Manual
8.11 EVP control
EVP can be controlled as an analog current-controlled valve or as an on/off valve.
EVP TYPE = ANALOG
The analog control of the EVP coil is made by means of a linear relationship
between the lowering-potentiometer voltage and the set-point for the current
applied to the valve. Considering the case when the EVP request refers to the
lowering valve, the upper and lower limits of the linear profile are given by
MIN LOWER – MIN EVP and MAX LOWER – MAX EVP. Instead, EVP current
is kept at zero for potentiometer voltages below MIN LOWER.
EVP analog control.
EVP TYPE = DIGITAL
If EVP is set to work as an on/off valve, the MIN EVP parameter is disabled and
the current set point applied to the valve is only dependent on MAX EVP.
The dynamic delay of the current set-point variations, for both ANALOG and
DIGITAL cases, depends on the EVP OPEN DELAY and EVP CLOSE DELAY
parameters (see paragraph 7.2.1):
OPEN DELAY determines the current increase rate, i.e. it defines the time
needed to increase the EVP current from zero up to the maximum.
CLOSE DELAY determines the current decrease rate, i.e. it defines the
time needed to decrease the EVP current from the maximum down to zero
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