Parker RAC Europe
PSD04 | User manual ver. 3.6 | Code 144PSDI364
Page 25 of 74
With the operation mode selected, the regulator uses the related SH set-point parameter. This is a fundamental
parameter for the proper functioning of the control algorithm. A low set-point ensures a higher evaporator
performance, lower temperatures, and minimum variations, but has the disadvantage that liquid may reach the
compressor.
The algorithm use different regulation parameters, depending on the working area:
-
if the measured error is lower than
Fast action threshold
(Fath), a more aggressive
algorithm is used (
Fast action
(Fast))
-
if the measured error is between
Neutral zone high threshold
(PNHi) and
Smart band
zone threshold
(Pcz) a smart algorithm is used.
-
if the measured error is between 0 and
Neutral zone high threshold
(PNHi) no
regulation is performed
All the input parameters, with the exception of the
Main control type
(Pcty), are acquired at every main cycle.
Fast
Err
Smart
FaTh
Normal control
0
No regulation (dead
PNHi
Normal control
Pcz