Carel EVD Evolution Twin - Analogue positioner (0 to 10 Vdc); 5.6 Programmable control

ENG
“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019
26
EVA
4...20 mA
regulator
T
P
420
mA
A1, A2
0%
100%
S1
EVD evolution
twin
EVB
4...20 mA
regulator
T
P
EVD evolution
twin
S3
Fig. 5.l
Key:
EVA Electronic valve A A1 Valve opening A
EVB Electronic valve B A2 Valve opening B
For the wiring, see paragraph “General connection diagram”.
Analogue positioner (0 to 10 Vdc)
This control function is only available for driver A. The valve will be positioned
linearly depending on the value of the “0 to 10 V input for analogue valve
positioning” read by input S2.
There is no PID control nor any protection (LowSH, LOP, MOP), and no valve
unblock procedure. The opening of digital input DI1 stops control on driver
A, with corresponding forced closing of the valve and changeover to standby
status.
EVA
0...10 Vdc
regulator
T
P
010
Vdc
A1
0%
100%
S2
EVD evolution
twin
Fig. 5.m
Key:
EVA Electronic valve A A1 Valve opening A
For the wiring, see paragraph “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 ltering. The
driver operates as a simple actuator, and receives the information needed to
manage the valves from the pCO.
Parameter/Description Def.
CONFIGURATION
Main control
…
I/O expander for pCO
multiplexed showcase/cold
room
Tab. 5.l
TA
PA
S1
EVD
evolution
S2
EEVA
S3 S4
Tx/Rx
GND
shield
pCO
GND
TB
PB
EEVB
Fig. 5.n
Key:
T Temperature probe P Pressure probe
EV Electronic valve
5.6 Programmable control
With programmable control, the unused probe can be exploited to activate
an auxiliary control function and maximise the controller’s potential. The
following types of programmable control are available:
• Programmable superheat control (SH);
• Programmable special control;
• Programmable positioner.
Parameter/description Def Min Max U.M.
CONFIGURATION
Main control
…
22=
Programmable SH control ¦
23 =
Programmable special control¦
24 =
Programmable positioner
…
Multi-
plexed
cabinet
/ cold
room
---
SPECIAL
Programmable control conguration 0 0 32767 -
Programmable control input 0 0 32767 -
Programmable SH control options 0 0 32767 -
Programmable control set point 0 -800
(-11603)
800
(11603)
Tab. 5.m
The table shows the programmable control functions and the related
parameter settings.
Function Parameter to be set
Direct/reverse setting Programmable control cong.
Type of physical value controlled Programmable control cong.
Input processing to determine measur. Programmable control cong.
Correction to each individual input for inte-
gration in measurement calculation
Programmable control input
Association between physical inputs and
logical outputs
Programmable control input