Expansion Card; Evd4*: Electronic Expansion Valve Driver - Carel µC2 User Manual

7.2 Expansion card

This device allows the µC to manage the second refrigerant circuit on chillers, heat pumps and conden-
2
sing units with up to 4 hermetic compressors.
The following figure shows the connection diagram for the µC
EV Driver
Tx/Rx GND
Expansion board
Bottom
G0 B5 B6 B7 ID10 ID8 ID6
G GND GND Y GND ID9 ID7
N L
Line
fig. 7.c
NOTe: The expansion features two LEDs on the main board (to see these, remove the top or bottom
door), which display its status by the following messages:
ON
green LED Board powered
red LED
The alarms are displayed in sequence and are separated from each other by pauses.

7.3 EVD4*: Electronic expansion valve driver

This device is used to control electronic expansion valves. The device is connected to the µC
serial line. The condensing pressure probe must be connected to the µC
to the driver.
Note: for all other information on the connections, refer to the EVD4* driver manual
1 GND 2
PHOENIX
MC1,5/3-ST-3,81
3 GND 4
EEV driver
G V DI1 S4V S3 S2 S1
MOLEX Mini-Fit bat
538-39-01-2140
G0 GND DI2 S4I Vr1 Vr2 OC
fig. 7.d
54
expansion card, code MCH200002*.
2
EV driver
No6 C6/7 C6/7 C8/9 x C10
No7 No8 No9 C8/9 x No10
GND Tx/Rx
GND B8 V+
t-LAN
flashing
Board powered and serial communication with µC
1 flash: Probe fault alarm
2 flashes: Zero crossing alarm (mains frequency not detected)
 flashes: Serial communication alarm with EVD
4 flashes: Serial communication alarm with µC
PHOENIX
COM NO
GMSTB 2,5/2 ST
FCSER00000
MOLEX Mini-Fit
GNX RT+ RT-
538-39-01-2060
µC - +0022071 - rel. 1.2 - 26.10.2007
2
N
Line
L
Top
pressure
probe
P
temperature
probe
digital
input
in progress
2
2
Table 7.b
2 via a tLAN
2 , which then sends the reading