Electronic Expansion Valve - Hitachi RAS-2-HVNP Service Manual

11. Electrial checks of main parts

11.3 Electronic expansion valve

Micro-computer
2-Phase permanent magnetic pulse motor
Control 0 to 500 pulse by 1 pulse
Refrigerant flow control
Precise control
Items
Type
Refrigerant
Working temperature range
Mounting direction
Flow direction
Drive method
Rated voltage
Drive condition
Coil resistance (each phase)
Wiring diagram drive circuit and activation
mode
447
Pulse signal
UKV series
R410A
-30 °C 70 °C (operation time of the coil: less than 50%)
Drive shaft in vertical direction within an angle of 45 °C as maximum
Reversible
4-Phase canned motor method
DC12V±1.8 V
63PPS
1.2 phase excitation
46Ω ± 10 (at 20 °C)
1. Drive circuit.
2. Wiring diagram.
3. Valve.
4 . Close.
5 . Open.
6 . Activation.
SMGB0079 rev.0 - 01/2013
1. Pulse motor.
2. Needle.
Specifications
11