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User Guide | Stepper Valve Extension Module, Type EKE 1P

Application 1

Application mode

In application 1, the EKE 1P operates as an extension module to a

CO2 pack controller, AK-PC. It is possible to configure if the EKE 1P

is used as an extension module where the stepper output controls

the high pressure, or as an extension module where the stepper

output controls the receiver pressure.

This is configurable through a software setting (parameter "Mode")

or through a hardware configuration. As default the hardware

configuration is enabled, which means the AI4 input is used for the

configuration as follows:

AI4 open circuit or connected to 0 V (COM): high-pressure valve driver

AI4 connected to 5 V+: receiver valve driver

The IO configuration of application 1 is determined through the

configuration of the AK-PC.

Some, all or a sub-set of the inputs and outputs may be used.

See documentation of the specific AK-PC for details.

Valve configuration

In application mode 1, the valve type is configured via the AK-PC.

Only if the valve type is set to "User Defined" in the AK-PC, it is

required to access the EKE 1P parameter list for configuring the

valve specific parameters like number of steps, max current etc.

In application mode 1, the EKE 1P will set the valve opening

degree to a fixed value in case of losing the CANBUS

communication to the AK-PC. As default the valve will close in this

case.

4 | BC320219567793en-000201

Application 2

Valve configuration

The valve type can be selected from an extensive list of Danfoss

standard valve types. When a standard type is selected, only a

few parameters need to be set i.e. a valve neutral zone, the valve

overdrive and valve opening degree in special situations.

If Danfoss standard valve type is not selected, app. 20 parameters

for the valve and valve motor control become visible ("Valve motor

type", "Valve drive current" etc.). See "Menu" for details.

Analogue input scaling

The EKE 1P may be configured for various voltage ranges, e.g.

2 – 10 V. Here the valve will be 0% open at 0 V and 100% open at

10 V and proportionally opened in values between. Typical input

ranges may be configured or the voltage range may be freely

configured within 0 – 10 V and 10 – 0 V.

Note: if the minimum is set to 0 V, the valve will start opening at

0.1 V to ensure detection of a valve closure signal (0 V).

Valve neutral Zone

The EKE 1P controller has a complex algorithm implemented to

handle oscillation issues related to output valve OD by defining

some neutral zone. In neutral zone, the valve will not move until it

overcomes the definite variation in the valve opening degree.

Valve Overdrive

To compensate for lost steps, the valve may be overdriven when it

closes to 0%. i.e. it will close with extra steps to make sure that it is

fully closed. This may, however, lead to increased wear on the valve

if it occurs frequently. To prevent this, the overdrive will only be

enabled when the valve opening degree exceeds a set value and

the overdrive function may only re-occur within a set interval.