User Guide | Stepper Valve Extension Module, Type EKE 1P
© Danfoss | DCS (vt) | 2020.03
BC320219567793en-000201 | 3
Advantages
• Simplified settings:
– For application 1, typically the controller needs no parameter
adjustment
– For application 2, only a few key parameter settings may be
required
• Power Supply:
– Easy wiring layout. With no risk of causing short circuits when
connecting to other units through power supply
– 24 V AC or 24 V DC: flexibility in selecting different transformers
• Universal valve support:
– Drives bipolar and unipolar valves
– Danfoss standard valves selectable through drop-down
– Flexible configuration of valve driver parameters for non-
Danfoss standard valves
Input and output
In application mode 1, all input and output are defined via the
master controller AK-PC set-up.
In application mode 2, the input and output are intended for one
specific function.
The overview of connections can be seen on page 12.
Operation
The daily operation can be set up via an external display device
although this is normally not required for application 2.
The normal operation screen for application 1 is shown below.
During set-up, the display images will be adjusted so that only the
relevant images are opened for additional setting and end-user
operation.
The operation is password protected, and three levels of access
can be granted.
The controller contains English language only.
Two sets of LEDs on the EKE 1P indicate the EKE 1P application
confirmation, valve status and alarm condition – see details further
below.
Data communication
The controller has a built-in CANBUS and a built-in MODBUS
interface. The interfaces are used as shown in below table:
Application
The controller is used as an extension module for other Danfoss
controllers (application 1 below) or as a stepper valve driver
(application 2 below).
Introduction
Application 1
Application 2
CAN RJ
CAN
EKE 1P
AK-PC
CCMT/ETS/CCM
Danf
oss
80G394
0
100
Min.
Max.
V
%
%
Danf
oss
80G395
Fig. 1
CAN RJ
V
EKE 1P
PLC
CCMT/ETS/CCM
Danf
oss
80G396
MMIGRS2
ACCCBI
080G0075
< 3m
CAN RJ
Fig. 2
CANBUS
MODBUS
Application 1
Interface to master
controller, AK-PC
MODBUS master
for establishing
communication with other
MODBUS devices to the
master controller, AK-PC
Application 2
Configuration of EKE 1P
and daily use interface
Not used – must not
be connected to any
MODBUS network
Fail-safe valve closure
As a stepper valve is provided with step motor, it will remain open
in a power failure situation.
For safety reasons, the liquid flow through the stepper valve must
be cut off if a power failure occurs.
There are two ways of coping with this situation.
One of the following two solutions can be applied in the system:
• Mounting of a solenoid valve in front of EEV
• Connection of a battery back-up for EEV valve
If the battery back-up is used, the battery voltage may be
continuously monitored to generate an alarm in case the battery
voltage gets out of range. As default this alarm is disabled.
