Carel k.Air, Руководство пользователя, Страница: 68 / 192

68
Functions
k.air +030220981 rel. 1.2 - 01.12.2020
9.10.9 P ower+ S peed drive
When the circuit features a BLDC compressor, this is controlled by a Power+ inverter, connected to the c.pCOmini controller via
Modbus master protocol with a serial baud rate of 19200 bps on the built- in FieldBus serial port. Use specifi c cable for RS485
(AWG20-22 with three wires plus shield).
See the parameters Uc… in the parameter table and the Power+ user manual, +0300048EN.
9.10.10 B uilt-in ExV driver
The driver to manage the electronic expansion valve is a fundamental device for the controller. This is used to safely manage the
compressor and the circuit, and reads all the fundamental probes for control of suction superheat, management of the working
area and discharge temperature. On c.pCOmini boards, the driver is built-in and manages unipolar valves. See parameters V... in
the parameter table, the Power+ 03000048EN and the EVD Evolution 0300005EN.
EXV control logic
The driver manages:
• valve activation
• suction superheat control
• low superheat alarm and control (Low SH)
• minimum evaporation temperature control and alarm (LOP)
• maximum evaporation temperature control and alarm (MOP)
• control of cooling capacity sent by the controller, which positions the valve correctly in the transient stages according to
circuit control status
Note: see the parameter table, reference Ua, Ub, Uc.
9.11 D irect expansion managed by μ C hiller
μChiller is the solution for the complete management of reverse- cycle refrigeration units with on- off compressors and/or DC
compressors, up to two circuits and two compressors per circuit, and including high-effi
ciency through Carel’s Power+ and
ExV system. uChiller can be easily integrated with k.air via the Fieldbus serial port to develop air handling units with a direct
expansion main coil. k.air sends the start- up and capacity modulation commands, making available the main operating status
information directly on the pGDE display, such as active compressors and active faults.
The modular k.air-μChiller architecture allows the confi gurability of the air handling unit to be separated from the specifi city
of the refrigeration unit. μChiller can also be used with the Applica app for confi guration. See the μChiller installation manual
+0300053EN.
Below is the simplifi ed connection diagram for the μChiller controller.
Ratiometric probe connection
4-20 mA probe connection
L
N
J 1
J 7
G0 G
J 6
C C
NO1 NO2 NO3 NO4 NO5
5 (1)A
5 (1)A
J 2 J 3
S1 S3 5V
S2 Y2
Y1
ID1
ID2
ID3 ID5
ID4 S4
S6 +V VL S5
J 11
C NO6
J 9
J 14
J 8
S7
ID6
5 (1)A
30220980_254_R01
24V AC/DC
J 10
J 4 B M S J 5 FB us
Te c h n o l o g y
J 3 J 2
ID3 ID5
ID4 S4
S6
VL
S1 S3
S2 Y2
Y1 ID1
ID2 S5
+Vdc
5+VREF
J 3 J 2
ID3 ID5
ID4 S4
S6
VL
S1 S3
S2 Y2
Y1 ID1
ID2 S5
+Vdc
5+VREF
J 3 J 2
ID3 ID5
ID4 S4
S6
VL
S1 S3
S2 Y2
Y1 ID1
ID2 S5
+Vdc
5+VREF
P
P
Fig. 9.y