Installation Guide

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Accessory: Stepper motor drivers

The PXE 02 and PXE 04 analog output signals from its controllers to evaporator controlling actuators are 0-10 V type from the fac-

tory. It is possible purchase Danfoss stepper motor drivers EKF 1A to drive 1 stepper motor valve and EKF 2A to drive 2 stepper mo-

tor valves as accessories that can be installed and wired by the customer. Stepper motor drivers change the analog output signal at

the panel terminal from 0-10 V to a stepper motor signal that may be conﬁgured according to the stepper motor valve’s

speciﬁcation. The following is a quick overview as to how a stepper motor driver may be installed in the panel.

Step 01: Mount the stepper motor driver on the DIN rail provided on the right side of the panel.

Step 02: Wire the power terminal available in the panel (X77) to the stepper motor power terminals and wire the correct AO

terminals (X160-X460) to the input side of the stepper motor driver. Please read the stepper motor driver instructions beforehand

and conﬁgure the driver according to the required application. The stepper motor valve may now be wired to the stepper motor

driver. See the installation instructions for the Danfoss EKF 1A and EKF 2A stepper motor drivers for stepper motor driver connection

details and observe the wiring recommendations regarding distance to the stepper motor valve: Link

Fig. 22

Fig. 23