Hitachi RAS-10HRNM, Service Manual, Page: 455 / 482

11.3 Electronic expansion valve
Micro-computer
2-Phase permanent magnetic pulse motor
Pulse signal
Control 0 to 500 pulse by 1 pulse
Refrigerant flow control
Precise control
1. Pulse motor.
2. Needle.
Items Specifications
Applicable to the models For the main cycle of: For IVX RAS-(4-12)H(V)RNM(1)(E) and ES RAS-(4-10)H(V)RNS(1)E
Type UKV(10.0 USRT) series/UKV (5.0USRT) series for MVB
Refrigerant R410A
Working temperature range -30 °C ~ 65 °C (operation time of the coil: less than 50%)
Mounting direction Drive shaft in vertical direction within an angle of 45 °C as maximum
Flow direction Reversible
Drive method 4-Phase canned motor method
Rated voltage DC12V±1.8 V
Drive condition 83PPS (pulse width at ON: 36 mm sec, OFF: 60 mm sec) 1.2 phase excitation
Coil resistance (each phase) 46Ω ± 10% (at 20 °C)
Wiring diagram, drive circuit and activation
mode
1. Drive circuit.
2. Wiring diagram.
3. Valve.
4 . Close.
5 . Open.
6 . Activation.
11 Electrical checks of
main parts
447
SMGB0060 rev. 1- 12/2010
11