Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 22
Note:
When the motor type is
Unipolar the steps entered is
half steps.
I067 – Valve Conguration
Danfoss stepper motor valve must be selected from Valve conguration list. On selecting the valve,
the controller will automatically load pre-dened default values. The user is not required to set
other stepper motor parameters for a selected valve from the valve conguration list.
User Dened valve
If a valve from other manufacturers is used, such valve can be dened as ’’User dened Valve’’
i.e I067 – Valve Conguration =1 and the following information will be required from the manufacturer
for settings following stepper motor parameters.
I027 – Valve Motor Type
Dene a type of motor used in the stepper valve (Unipolar/Bipolar). Selecting the motor type will set
the required valve decay mode. Alternatively, you can also set valve decay mode parameter if you
need more options. Avoid setting both Valve motor type and valve decay mode for a given valve at
the same time.
I028 - Phase Current Peak /Valve drive current
The current applied to each phase of the stepper motor during actual valve movement. Verify the
range against the stepper valve controller in the actual design. Please be aware that this value
has to be set in a Peak value. Some valve manufacturers are using RMS current!
I077 Holding Current
The percent of the programmed Max Phase Current that should be applied to each phase of the
stepper output when the valve is stationary. If required, this current ensures that the valve
maintains its last programmed position.
I030 - Max Operating Steps /Total no of valve steps
The number of steps that correspond to a valve position of 100%. The total no of steps will vary
according to the selected Valve motor type.
For example ETS 6 has total number of 480 half steps on driving with half phase excitation whereas
only 240 full steps on driving with Full phase excitation.
I031- Step Rate /Speed
The desired valve drive rate in steps per second.
Please note that a higher valve speed will produce a lower torque. If the valve is used in system
having high dierential pressure, it is better to operate the valve with lower step rate.
[I032 - Valve Start Speed] (1-100% of Valve speed )
This is useful for high speed valve that runs at speed i.e 200 to 400 pps
This feature will limit starting speed of the valve in order to provide higher torque to the motor at start
up and will prevent the valve from potential step loss. Refer to the diagram below for detail.
I062 - Valve Acceleration Current , I063 - Valve Acceleration Time
These features are used in the valve that runs at higher speed i.e 300 pps and above. Typically, at start
up high torque is required to operate the valve. The high torque at start up can be maintain by using
acceleration current as required. Following chart shows the relation between valve speed and valve
current as well as the recommend percentage of acceleration current.
7.2 Stepper motor valve
parameters
Note:
Change of valve type
requires that the controller
is in stopped state.
Warning:
Modifying the Danfoss valve
parameter will revert I067 –
Valve Conguration to
1 i.e User Dened valve.
Valve speed ramp up at start up
IO63 Acceleration time
Speed / PPS
Danfoss 80G344.10
IO31 Normal speed
IO32
Valve start speed
20% of normal speed
(recommended)
T
ime
Valve acceleration current at start up
IO63 Acceleration time
Peak current
Danfoss 80G345.10
IO28 Normal current
IO77 Holding current
T
ime
IO62 valve acceleration
current, 120% of IO28
(recommended)