EVCO S.p.A.
EVDRIVE04 | User manual ver. 1.1 | Code 144EPD4I114
Page 26 of 78
6.7
Algorithm start-up
To enter algorithm mode, from the
Stand-by off
(10), set the
Main control type parameter
Pr01 = 6 to perform
Superheat (SH) control or Pr01 = 8 to perform hot gas bypass control. If all the configuration is correct enter in
Stand-by on
(11) and then in the
Stabilization
(40), in which is performed a positioning to Stabilization position
(parameter Pr09) and await Stabilization delay (parameter Pr08).
Then enter in
Start-up
(41), in which is performed a positioning to Start-up position (parameters Pc21 or Pp21) and
await Start-up delay (parameters Pc20 or Pp20).
Finally enter in the Algorithm selection (42) in which evaluates Main control type (parameter Pr01) and Functioning
mode (parameter Pr02).
This state also enables manual mode, debugger mode, or one of the available SH-algorithm.
The
Functioning mode
(Pr02) defines the algorithm's operation mode, while
Main control type
(Pr01) defines which
algorithm can be used.
Specifically:
•
Pr02 = 0: enables control SH-algorithm defined by
Main control type
(Pr01)
•
Pr02 = 1: enables manual algorithm, which permits movement of the valve to the position specified by
Manual set-point position
(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
(Pr02) occurs every main cycle, and thus switching between the three algorithm
operation modes occurs without forced intermediate positioning moves.
Note that Functioning mode (parameter Pr02) and Manual set-point position (parameter Pr03) are not
saved into memory, this means that from reset the valve starts always in automatic mode with
Functioning mode Pr02 = 0 and Manual set-point position Pr03 = 0.
6.8
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.
