ETS250-400-034G2602 electronic expansion valve produced by Danfoss introduction 

ETS is a series of electric expansion valves forprecise liquid injection in evaporators for airconditioning and refrigeration applications.The valve piston and linear positioning design isfully balanced, providing bi-flow feature as well as solenoid tight shut-off function in both flow directions.

The valve design uses bi-polar drive providing very precise flow regulation.

ETS valves are compatible with electronic control solutions from Danfoss and other manufacturers.

ETS250-400-034G2602 electronic expansion valve produced by Danfoss operation

The ETS valves operate modulating by electronically controlled activation of the AST stepper motor. The motor is a type 2-phase bi-polar, which stays in position, unless power pulses from a driver initiate the two discrete sets of motor stator windings for rotation in either directions.

The direction of the rotation of the spindle depends on the phase relationship of the power pulses. This is decisive for the travel of the piston.

The motor is operating the spindle, whose rotating movements are transformed into linear motion by the transmission in the cage assembly.

The AST motor housing has a glass sealed M12 connection as standard, which can be connected with customized cable and plug/socket combinations.

The piston design inside the ETS valve is pressure balanced, giving identical bi-flow performance capabilities and nearby identical maximum

capacities. Closing the valve by overdriving, ensures that the reference number in steps is always correct.Operating the ETS series requires a controller with either 12 V DC voltage drive (5.5 W) or using chopper current drive (100 mA RMS).

Note:

Depending on the type of controller or driver,there will be limitations in cable length between valve actuator and driver.Both the actual cable length, the level of EMC emission on the location and driver circuit has an impact on the actual distortion of the current to the actuator motor.

In order to increase max. cable length considerably, install a 10 mH filter type Danfoss AKA 211 on the four power terminals.Please contact Danfoss for further information how and when to apply this countermeasure in cases with questionable cable length.