Auxiliary Control - Carel EVD Evolution Twin User Manual

ENG
C
L
F
S
M
V
E
EV
Legenda:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
TA,TB Temperature probes
For information on the wiring see paragraph "General connection diagram".
To optimise performance of the refrigerant circuit, compressor operation
must always be inside a specific area, called the envelope, defined by the
compressor manufacturer.
The pCO controller defines the current set point according to the point of
operation within the envelope:
•
superheat setpoint;
•
discharge superheat setpoint;
•
discharge temperature setpoint.
Parameter/Description
ADVANCED
Superheat setpoint
Discharge superheat setpoint
Discharge temperature setpoint
Note :
this control function is only available CAREL valve drivers; no set point needs
to be configured by the user.
Superheat regulation with 2 temperature probes
"EVD Evolution TWIN" +0300006EN - rel. 2.6 - 31.01.2019
TB
PB
POWER +
speed drive
EVD
evolution
CP
GND Tx/Rx
PA TA
pCO
shield
Fig. 13.d
V Solenoid valve
S Liquid gauge
EV Electronic valve
E Evaporator
PA, PB Pressure probes
Inviluppo ⁄ Envelope
Temperatura di evaporazione (C°)
Evaporation temperature (C°)
Fig. 13.e
Def. Min. Max.
11 LowSH: 180(324) K(°F)
threshold
35 -40(-72) 180(324) K(°F)
105 -60(-76) 200(392) °C(°F)
The functional diagram is shown below. This type of control must be used
with care, due to the lower precision of the temperature probe compared to
the probe that measures the saturated evaporation pressure.
Parameter/Description
CONFIGURATION
Main control
...
superheat regulation with 2 temperature
0V + -
probes
1 2 3
Modbus®
RS485
F
S
M
V
Key:
CP Compressor
C Condenser
L Liquid receiver
F Dewatering filter
T Temperature probe
Parameter/Description
ADVANCED
Superheat setpoint
PID: proportional gain
PID: integral time
PID: derivative time

13.9 Auxiliary control

Auxiliary control can be activated at the same time as main control, and uses
the probes connected to inputs S3 and/or S4.
Parameter/description
CONFIGURATION
Auxiliary control:
1=Disabled;
2=High condensing temperature protection on S3 probe;
3=Modulating thermostat on S4 probe;
4=Backup probes on S3 & S4;
UOM
5, 6, 7 = Reserved;
8 = Subcooling measurement;
9 = Reverse high condensing temperature protection on S3
Tab. 13.g
For the high condensing temperature protection (only available with
superheat control), an additional pressure probe is connected to S3 that
measures the condensing pressure. For the modulating thermostat function
(only available with superheat control), an additional temperature probe
is connected to S4 that measures the temperature on used to perform
temperature control (see the corresponding paragraph).
62
Def.
multiplexed showcase/cold
room
C
L
EVD
evolution
EV
T
E
Fig. 13.f
V Solenoid valve
S Liquid gauge
EV Electronic valve
E Evaporator
Def. Min.
11 LowSH: soglia 180 (324) K (°F)
15 0
150 0
5 0
CP
T
Max. U.M.
800 -
1000 s
800 s
Tab. 13.h
Def.
Disabled
Tab. 13.i