0906-E
21
DRIVING THE ELECTRONIC EXPANSION VALVE
Function
Control the adequate filling of the evaporator heat exchanger with refrigerant, in order to get the best
efficiency, while allowing a good protection of the compressor against liquid slugging
Description
The electronic expansion valves used on units fitted with CLIMATIC
TM
50 are controlled using the EVD200
Driver
This driver is design to communicate with the CLIMATIC
TM
50 main control board through a “pLan” BUS.
The driver can be set up using the following DS50 menus:
3511, 3521, 3531, 3541 ! Superheat circuit 1, 2, 3, 4
3512, 3522, 3532, 3542 ! Anticipation circuit 1, 2, 3, 4
3513, 3523, 3533, 3543 ! Proportional Factor circuit 1, 2, 3, 4
3514, 3524, 3534, 3544 ! Integral Factor circuit 1, 2, 3, 4
3515, 3525, 3535, 3545 ! Derivative Factor circuit 1, 2, 3, 4
It is highly recomended NOT TO CHANGE the factory setting of the EVD Driver
The Anticipation factor allow the pre-opening of the EEV during circuit start-up and is calculated according to
the capacity at start up.
Futhermore the EVD Driver is fitted with Leds indicating its status:
Power (Green) ! Shows the power is ON
Open (Green) ! Flashes during the expanion valve Opening –
Stays ON when the expansion valve is Fully Open.
Close (Green) ! Flashes during the expanion valve Closing –
Stays ON when the expansion valve is Fully Closed.
Error (Red) ! Stays ON when Alarm is ON (Refer to Faults and Alarms section)
pLan (Green) ! Stays ON when the communication is established with CLIMATIC
TM
50 –
Flashes when the communication is disturbed or broken.
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