Auxiliary Control - Carel EVD evolution User Manual

ENG
This involves PID control without any protectors (LowSH, LOP, MOP,
High Tcond, see the chapter on Protectors), without any valve unblock
procedure and without auxiliary control. Control is performed on the gas
cooler pressure probe value read by input S1, with a set point depending
on the gas cooler temperature read by input S2; consequently there is
not a set point parameter, but rather a formula:
"CO gas cooler pressure set point"= Coeffi cient A * Tgas cooler (S2) +
2
Coeffi cient B. The set point calculated will be a variable that is visible in
display mode. Control is direct, as the pressure increases, the valve opens.
Parameter/description
ADVANCED
CO regul. 'A' coeffi cient
2
CO regul. 'B' coeffi cient
2
CONTROL
PID proport. gain
PID integration time
PID derivative time
Analogue positioner (4 to 20 mA)
The valve will be positioned linearly depending on the value of the "4 to
20 mA input for analogue valve positioning" read by input S1.
There is no PID control nor any protection (LowSH, LOP, MOP, High Tcond,
see the chapter on Protectors), no valve unblock procedure and no

auxiliary control.

EV
EVD
evolution
A
100%
0%
4
Key:
EV Electronic valve
For the wiring, see paragraph 2.11 "General connection diagram".
Forced closing will only occur when digital input DI1 opens, thus
switching between control status and standby. The pre-positioning and
repositioning procedures are not performed. Manual positioning can be
enabled when control is active or in standby.
Analogue positioner (0 to 10 Vdc)
The valve will be positioned linearly depending on the value of the "0 to
10 V input for analogue valve positioning" read by input S1.
There is no PID control nor any protection (LowSH, LOP, MOP, High Tcond),
no valve unblock procedure and no auxiliary control, with corresponding
forced closing of the valve and changeover to standby status.
"EVD evolution" +0300005EN - rel. 3.1 - 25.07.2011
Def. Min. Max. UOM
3.3 -100 800 -
-22.7 -100 800 -
15 0 800
150 0 1000 s
5 0 800 s
Tab. 5.p
T
regulator
P
4-20 mA
20
mA
Fig. 5.j
A Valve opening
EV
EVD
evolution
A
100%
0%
0
Key:
EV Electronic valve
For the wiring, see paragraph 2.11 "General connection diagram".
Important: the pre-positioning and repositioning procedures
are not performed. Manual positioning can be enabled when control is
active or in standby.
I/O expander for pCO
The EVD Evolution driver is connected to the pCO programmable
controller via LAN, transferring the probe readings quickly and without
fi ltering. The driver operates as a simple actuator, and receives the
information needed to manage the valves from the pCO.
Parameter/Description
CONFIGURATION
Main control
...
I/O expander for pCO
EVD
evolution
GND Tx/Rx
T
P
T
P
Key:
T Temperature probe
EV Electronic valve
24
regulator
0-10 Vdc
10
Vdc
Fig. 5.k
A Valve opening
Def.
multiplexed showcase/cold
room
EV
pCO
shield
Fig. 5.l
P Pressure probe
T
P
Tab. 5.q