Operating Guide | Control of stepper motor valves with AK-CC55 Single Coil, EKE 1P, EKE 2U
Introduction
Wiring example
AK-CC55 Single Coil can be set up to control stepper motor valves.
This document will describe how the wiring is done and how the controller can be set up.
The stepper motor valve is controlling the injection of refrigerant into the evaporator, hence replacing
the AKV valve. The AKV valve output can then be used to control a solenoid valve in the liquid line. The
solenoid valve will close in case of power failure.
A stepper motor driver is needed to convert the analogue output that the AK-CC55 controller can
deliver to a stepper motor output. The stepper motor driver used here is the EKE 1P.
There is no bus communication between the AK-CC55 controller and the EKE 1P, but the controller can
receive a “--- Driver alarm” in case of an alarm on the EKE 1P.
A back-up power module can be installed to secure closure of the stepper motor valve in case of
power failure. The power module used here is the EKE 2U.
This stepper driver feature is implemented in software version 1.53 of the AK-CC55 Single Coil
controller.
The sketch below is showing how the analogue output on the AK-CC55 controller is connected to the
EKE 1P stepper motor driver where the stepper motor valve is connected.
The sketch also shows how the back-up power module is integrated.
When the wiring is done, the controller and the two modules can be powered up.
Products used in this example:
AK-CC55 Single Coil, 084B4082, SW version 1.53
EKE 1P, 080G0325, SW version 2.10
EKE 2U, 080G5555, PV00
KoolProg is a PC software which can be downloaded from the KoolProg download site where the
User Guide can also be found. Please notice that the User Guide describes the need for an MMIMYK
interface (Code No. 080G0073), a Mini USB cable and an RJ11 cable (Code No. 080G0075) for
connection with AK-CC55 controller. The controller can also be set up using the AK-CC55 Connect App
(a mobile phone application) via the AK-UI55 Bluetooth display and it can be set up via the AK-SM
800A type System Manager.
Operating Guide | Control of stepper motor valves with AK-CC55 Single Coil, EKE 1P, EKE 2U
The picture on the previous page shows an example of how the AK-CC55 Single Coil controller can be
set up.
• Application mode (q61) is set to “4” (as an example)
• AO1 Configuration (q09) on the analogue output is set to “Valve driver”
• AO1 Minimum voltage (o27) on the analogue output is set to “0” V
• AO1 Maximum voltage (o28) on the analogue output is set to “10” V
• DI2 Configuration (o37) on the digital input 2 is set to “Valve driver”
With this setting the analogue output will send a signal in the range of 0 to 10 V to the stepper driver
module and should an alarm situation be raised on the stepper driver, the AK-CC55 controller will
receive the alarm message “Valve driver”, which can be seen in the alarm list on the controller and
hence on the system manager.
Setting up EKE 1P using the
MMIGRS2 display
The set-up requires the use of the MMIGRS2 display (Code No. 080G0294) and the RJ11 cable (Code
No. 080G0075). But, this EKE module cannot be set up via KoolProg PC software.
The MMIGRS2 display has to be connected to the EKE 1P stepper motor driver via the RJ11 cable
before the set-up can start.
The settings shown here sets up the driver:
• Press “Enter” to activate display.
• Press “Enter” and hold “Enter” a couple of seconds to activate “Setup & service” (an access code might
have to be set)
• START/STOP
– Main switch is already ON (by default with Application 1) so it has to be switched OFF to allow
changes to Application Mode.
– Main switch: OFF
– Application Mode: 2
• Device config.
– Mode settings: AI HP/Rec., HP exp, Rec. exp., AI valve
– Mode set to: AI valve
• AI valve in…
– AI valve input scale: 0 – 10 V
• I/O
– Output Relay control: Auto
– Configure:
– DI1 Active: ON
– DI2 Active: ON
• Alarm config.
– Battery Alarm options: NO, EKE 2U, Bat.
– Battery alarm: EKE2U