DOTECH FX32EV Руководство - Страница 2
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Outline
FX32EV is especially designed for control and management of electronic expansion valve
at refrigeration unit. It is a electronic expansion valve controller to control the degree of
superheat by using PID control and through measuring pressure and temperature.
- PID superheat control through protection and safety compensation function.
- Electronic expansion valve control unit which is controlled by 4~20mA signal
This unit is composed of EX32EV main board, temperature sensor and pressure sensor
for gauging suction pressure.
- FX32E supports ON/OFF electronic expansion valve (AKV-danfoss).
FX32EV can control superheat of various refrigerant.
- R22, R134a, R404a, R407c, R410a, R717, R23
(Currently supported refrigerant August 2009)
- R507c, R290, R600, R600a, R744, R728 (Planned)
Control method of electronic expansion valve
FX32EV is a control unit for ON/OFF type electronic expansion valve.
(It doesn't support step motor type expansion valve.)
- It can control in 0.1% unit from 0.0 to 100.0% through PWM (open ratio control)
control method
- Control cycle can be set from 1 sec. to 60 sec. (control in 10msec. unit)
Control cycle : 6 seconds
50%
25%
On
Off
0
6
Pressure sensor and Temperature sensor
FX32EV has adopted pressure sensor and temperature sensor which are especially designed for refrigerant gas to secure accuracy and safety.
- Pressure sensor : -1 ~ 9 bar (4~20mA) or 0 ~ 30 bar (4~20mA) It can be selected
- Temperature sensor : -100 ~ 100'C, Pt1000Ω
Electronic expansion valve control regulated by 4~20mA signal
FX32EV-A1 model can transmit pressure value measured by 4~20mA method and can be used for electronic expansion valve which is controlled by 4~20mA signal.
Built-in RS485 communication function
FX32EV-R4 with RS485 can interface with another device and supports MODBUS RTU/ASCII type protocol.
Set-up of the degree of superheat
Operation
Mode
Push for 3 seconds.
● If push SEL button for 3 sec. then setup is completed and returns
to operation mode.
● If there is no input for 180 sec. during setup, it returns to operation mode.
75%
12
18
t(sec)
Set-up by using ▲ ▼ button
Error Messages
Pressure sensor is disconnected.
POP
Check pressure sensor.
Pressure sensor is short-circuited.
PST
Check pressure sensor.
Temperature sensor is disconnected.
TOP
Check temperature sensor.
Temperature sensor is short-circuited.
TST
Check temperature sensor.
Operation State Messages
Maximum operation pressure is detected.
MOP
Minimum operation pressure is detected.
LOP
Upper limit the degree of superheat is detected.
HSH
Lower limit the degree of superheat is detected.
LSH
How to change setting 1 group and 2 group
Operation
Mode
Push for 3 sec. in case of setting 1 group
Push for 5 sec. in case of setting 2 group
First setting parameter
Last setting parameter
Set-up by using ▲ ▼ button
2