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8.3 Variables used based on the type of
control
The following table shows the variables used by the driver depending on
the values of the Main control and Auxiliary control parameters.
These variables can be shown on the display by accessing display mode
(see paragraph 3.3 Display mode and via a serial connection with VPM,
PlantVisorPRO, .....
Proceed as follows to display the variables:
•
press UP/DOWN;
•
press the DOWN button to move to the next variable/screen;
•
press Esc to return to the standard display.
Variable displayed
Valve opening(%)
Valve position (step)
Current unit cooling capacity
Control setpoint
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
gas cooler outlet temperature
2
CO
gas cooler outlet pressure
2
CO
gas cooler pressure set point
2
S1 probe measurement
S2 probe measurement
S3 probe measurement
S4 probe measurement
4 to 20 mA input value
0 to 10 Vdc input value
DI1 digital input status (*)
DI2 digital input status (*)
EVD fi rmware version
Display fi rmware version
Adaptative regulation status
0= Not enabled or stopped
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 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
Discharge superheat
Discharge temperature
(*) Digital input status: 0= open, 1= closed.
Note: the readings of probes S1, S2, S3, S4 are always displayed,
regardless of whether or not the probe is connected.
Main control
Superheat control
Auxiliary control
High Tcond
Modulating
thermostat
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Tab. 8.c
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"EVD evolution" +0300005EN - rel. 3.1 - 25.07.2011
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