Carel EVD Evolution Twin - 8.6 Variables used based on the type of control

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“EVD Evolution TWIN” +0300006EN - rel. 2.6 - 31.01.2019
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8.6 Variables used based on the type of
control
The table below shows the variables used by the drivers depending on the
“Main control” parameter. At the end of the variable list are the screens used
to check the probe and valve electrical connections for driver A and driver
B. These variables are visible on the display by accessing display mode (see
paragraph 3.4) and via serial connection with VPM, PlantVisorPRO,… (see
paragraphs 8.4, 8.5)
Procedure for showing the variables on the display:
• press the Help and Enter buttons together to select driver A or B;
• press the UP/DOWN button;
• press the DOWN button to move to the next variable/screen;
• press the Esc button to return to the standard display.
Main control
Variable displayed Superheat
control
Transcritical
CO
2
Gas bypass
temperature
Gas bypass
pressure
EPR back
pressure
Analogue
positioning
I/O expander
for pCO
Control with
level sensor
Valve opening (%) • • • • • • • •
Valve position (step) • • • • • • • •
Current unit cooling capacity • • • • • • •
Set point control • • •
Superheat •
Suction temperature •
Evaporation temperature •
Evaporation pressure •
Condensing temperature (*)
Condensing pressure (*)
Modulating thermostat temperature(*)
EPR pressure (back pressure) •
Hot gas bypass pressure •
Hot gas bypass temperature •
CO
2
gas cooler outlet temperature
•
CO
2
gas cooler outlet pressure
•
CO
2
gas cooler pressure set point
•
Probe S1 reading • • • • • • • •
Probe S2 reading • • • • • • • •
Probe S3 reading • • • • • • • •
Probe S4 reading • • • • • • •
4 to 20 mA input value ••
0 to 10 V input value ••
Status of digital input DI1(**) • • • • • • • •
Status of digital input DI2(**) • • • • • • • •
EVD rmware version • • • • • • • •
Display rmware version • • • • • • • •
Adaptive control status
0= not enabled or stopper
1= monitoring superheat
2= monitoring suction temperature
3= wait superheat stabilisation
4= wait suction temperature stabilisation
5= applying step
6= positioning valve
7= sampling response to step
8= wait stabilisation in response to step
9= wait tuning improvement
10= stop, max number of attempts exceeded
•
Last tuning result
0= no attempt performed
1= attempt interrupted
2= step application error
3= time constant/delay error
4= model error
5= tuning ended successfully on suction
temperature
6= tuning ended successfully on superheat
•
Liquid level percentage •
Tab. 8.e
(*) The value of the variable is not displayed
(**) Status of digital input: 0= open, 1= closed.
Note: the readings of probes S1, S2, S3, S4 is always displayed, regardless
of whether or not the probe is connected