Electronic Expansion Valve - Hitachi RASC-4HNPE Service Manual

8 Electrical checks of the main parts

Electronic expansion valve

8.3 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
137 SMGB0091 rev.2 - 11/2015
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° as maximum
Reversible
Permanent magnet type (20 poles). Stepping motor direct drive type
DC12V ±10%
80 ±5 pps (for 4-6HP) and 63 ±5 pps (for 8/10HP)
1-2 phase excitation
46 ±3Ω (at 20°C)
ON
OFF
Drive
circuit
Needle
Specifications
Wiring diagram
Close
Valve
Activation
Pulse motor
Open
8