Introduction; Smooth Lines On Mpxpro: How It Works - Carel PVPRO Mode D'emploi

1.1 Smooth lines on MPXPRO: how it works

The main target of the Smooth lines function, available on MPXPRO version 3.2 and higher, is to keep the
control temperature very stable around the set point, avoiding frequent ON/OFF cycles of cooling request.
The parameters involved in the Smooth lines confi guration are listed in the following table:
Parameter name Menu
St CtL
rd CtL
P3 Eud
PHS Eud
PLt Eud
PSI Eud
PSM Eud
PSP Eud
PSd -
TSH -
FSt -
The function works as follows: when the control temperature reaches the set point + half of the diff erential,
the control is not stopped, and a special PID algorithm increases the working superheat set point in order
to modulate the expansion valve. This special algorithm works until the control temperature exceeds St –
PLt.
1.

INTRODUCTION

Fig. 1.a
Description
Control set point
Control diff erential
Superheat set point
Positive SH off set
Off set below set point for cut-off
Integral time
Enable function
Proportional coeffi cient
Derivative time
Superheat threshold
Superheat averaging time window
5
ENG
Visibility
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO & User interface
PVPRO
PVPRO
PVPRO
+030220575 - 1.1 - 04.12.2014
Tab. 1.a