LB
II
-PLUS Technical Manual
34
3.4.2
Electronic expansion valve and controller
A.
Application and function:
HB-EVC-200LM electronic expansion valve module is used to control the motor temperature of LB
II
serious
compressor. The electronic expansion valve module is composed of an electronic expansion valve and a controller.
The controller reads the temperature of the motor through the resistance signal from the motor embedded NTC
sensor to automatically control the opening of the electronic expansion valve to achieve automatic control of the
liquid spray of the motor.
1. Through the control logic, the controller keeps the motor temperature stable in a safe range, and prevents the
motor from serious frosting and high temperature
2. G1 and G2 terminals output 4-20mA current (active output, avoid external power supply), and the corresponding
motor temperature is 0-110
℃
. The corresponding table of current temperature is shown in the attached table.
3. Normal operation, relay M2 and M1 are disconnected, M2 and M0 are closed. When the motor temperature is
higher than 95 C, M2 and M1 are closed, M2 and M0 are disconnected, and can be connected as required.
4. Terminal A/B can be connected with 2G cloud module or manual operator to modify the internal parameters of
the controller. Please refer to the manual for internal parameters modification of electronic expansion valve
controller for specific parameters modification.
5. It is necessary to install a solenoid valve in front of the expansion valve to ensure that the compressor starts
spraying liquid when it is turned on and stops spraying liquid when it is turned off.
6. Note:
The compressor can be started only after the controller is powered on for 1min. When the compressor stops and starts
again, the interval should be more than 1min, otherwise the motor may be burnt out.
The module must be assembled and maintained by a professional electrician. The module shall be connected
with electrical equipment and cooling device according to European or national standards. Shielded wire is required
for 4-20mA current output line.
