
Parker RAC Europe
PSD04 | User manual ver. 3.6 | Code 144PSDI364
Page 23 of 74
The other three analog input are configured according to their respective Ai probe usage (parameter Pia).
6.6
Algorithm start-up
To enter algorithm mode, from the Stand-by off (10), set the Main control type (parameter Pcty) with a value greater
or equal to 6, and enable the valve. If all the configuration are correct enter in Stand-by on (11) and then in the
Stabilization (40), this allows the valve to move to its stabilization position (parameter Pr09) and await for the
expiration of Stabilization delay to time out (parameter Pr08).
Then enter in Start-up (41), which performs the Start-up position sequence (parameter Pc21 or Pp21), await for the
Start-up delay to be completed (parameter Pc20 or Pp20) and finally enter in the Algorithm selection (42) in which
evaluates Main control type (parameter Pcty) and mode Function (parameter Pr02).
This also enables manual mode, debugger mode, or one of the available SH-algorithm.
The Functioning mode (parameter Pr02) defines the algorithm's operation mode, while Main control type (parameter
Pcty) defines which algorithm can be used.
Specifically:
Pr02 = 0: enables control SH-algorithm defined by Main control type (parameter Pcty)
Pr02 = 1: enables manual algorithm, which permits movement of the valve to the position specified by Manual
set-point position (parameter Pr03)
Pr02 = 2: actives a specific algorithm that moves the valve linearly up and down, at the desired step rate,
between two specified positions.
Loading of Functioning mode (parameter Pr02) occurs every mains cycle, which allows switching between the three
algorithm operation modes to be carried out without forced intermediate positioning moves.
Note that Functioning mode (parameter Pr02) and Manual set-point position (parameter Pr03) are not
saved into Eeprom, this means that from reset the valve always starts in automatic mode with Functioning
mode Pr02 = 0 and Manual set-point position Pr03 = 0.
6.7
Manual mode
In manual mode (parameter Pr02 = 1), this permits movement of the valve and bringing it to the percentage value
stored in Manual set-point position (parameter Pr03) using the maximum step rate.
Position
100%
0%
t [s]
Pr08
Pr11%
Pr09%
Pr10