Product Overview

© Danfoss | DCS | 2019.04
Data sheet | Superheat controller type EKE 1A, EKE 1B, EKE 1C
DKRCC.PD.RS0.A4.02 | 24
Danfoss
80G244.01
mA
Valve OD request
Small variation in OD
signal or valve OD request
7.3 Useful Valve
parameters for various
application
The following valve parameters can be used in various application as needed.
I061Valve emergency speed
During power failure conditions, the valve can be driven at higher speed when required to close
faster. To run this feature, it is required to connect EKE with backup battery.
I066 –Minimum OD limit
When required, the valve minimum OD can be set to a required minimum opening position, such
feature is helpful where the system always requires some minimum ow. The minimum OD limit
has eect in injection control mode only.
N032 – Maximum OD limit
This is useful feature to limit the maximum OD of a oversized valve used in the system. By default
the maximum OD of a valve is set at 100 OD%. This maximum OD % can be set to lower value if
required. The maximum OD limit has eect in injection control mode only.
I069 – Valve OD during stop
In some applications valve must remain open when the controller is OFF. This can be done by setting
a xed opening degree. When normal control is switched OFF using a main switch, the valve will
keep the dened opening degree. This feature is also known as Forced opening during OFF / (Bleed
function).
I068 – Valve neutral Zone
EKE controller has a complex algorithm implemented to handle oscillation issues related to output
valve OD by dening some neutral zone. In neutral zone, the valve will not move untill it overcomes
the denite variation in the valve opening degree .
For the default neutral zone of 0.5 % hysteresis, the valve will not move if it is unable to receive the
higher variation than the set value.
The benet of using such techniques will not aect the performance of the system but will reduce
the problem related with the uctuating signal, step loss and hysteresis in the valve.
Failsafe Position
During failsafe mode of operation (e.g. SH control sensor error or Thermostat sensor error) the
valve position can be set to full close, xed opening degree or average calculated OD. For detail
check section Failsafe operation and parameter list under section control advance sub section
Diagnostic SH and Emergency cooling.
100 OD%
Limiting max. OD%
(IO66 - default 100)
Valve OD%
Danfoss
80G346.10
IO31 Normal speed
Start backlash
(IO70)
Valve OD during stop
(IO69 - default 0)
Limiting min. OD%
(IO32 - default 0)
Full step
Half step
Valve steps
(Full, half, 1/8 Micro, 1/16 M
icro)
(IO29 - Valve step positioning)
(IO64 - Valve step mode)
Valve total steps
(IO30 - default 1)
Valve speed IO31
Overdrive enable OD
(IO73 default 0)
Neutral zone
No valve movement