EKE 2U module is an optional energy storage device. The module can provide enough energy
during power failure to the stepper controller to ensure closure of the electronic valves. It can be
080R9346
used with one or two controllers depending on the application.
State of Health (SOH) function of EKE 2U gives feedback to controllers to detect the status of the
backup module and lets the controller know if the backup is Ready to use, Charging or Failed.
Power Failure signal (PF): This signal should be connected to controller only if the controller
cannot detect power failure by itself. Not required for EKE controllers.
Load Switch, EKE 2U can deliver power backup for 2 valves. While using more than 1 valve the
load switch can be changed to deliver more energy.
Compatible Controllers: Danfoss EKE series and MCX controllers. For other controllers, please
contact Danfoss.
Info for UK customers only: Danfoss Ltd., 22 Wycombe End, HP9 1NB, GB
Dimensions in mm
EKE 2U
125
121
Weight: 233 gram
80
60
Technical specications
Nominal input voltage24 V DC / 24 V AC
Input voltage range20 - 40 V DC, 19 - 29 V AC
FrequencyDC / AC 50 … 60 Hz + /-10%
Overvoltage capability< 42 V DC
Nominal input powerDC: 15 VA, AC: 25 VA
Protection classII
Inrush current< 15 A
Standby current @ 24 V DC~ 0.1 A
Nominal output voltage (U
Nominal output current (I
)24.0 V DC ± 2%
NOM
)2 A
NOM
Maximum output current on standby30 mA
Current limiting2.5 A ± 10%
Parallel connection for time increaseyes
Series connectionno
Capacitor charging current @ 24 V DC< 1 A
Charging time~ 2.5 min from fully discharged state
Max Voltage / current at X2 (open collector)24V / 8.5 mA
Ambient temperature during operationT
Storage temperature- 30 °C - + 70 °C
Humidity< 90 % rH, no condensation.
Environmental pollutionTyp e 2
Protection degreeIP 20
AltitudeUp to 2000 m
Immunity to voltage Surges EN 61000-4-5Level 3 in/out
AssemblyOn DIN rail
Overvoltage protectionCategory II
Lifespan>90000 hours (10 years) @ 35 °C and >3 years @ 50 °C
MTBF> 500.000 h @ 25 °C according to IEC 61709 / SN 29500
. Load switch POS A and POS B denes the max energy supplied by the EKE 2U as power backup.
. POS A delivers more energy than POS B. Using at POS B further increases lifetime of EKE 2U.
. Load switch has default position POS A and POS A will work throughout all combinations.
State of Health (SOH) FunctionLEDs
ReadyBackup is ready and controller can start
operating valves.
ChargeBackup module is charging. Controller
must not operate valves.
ReplaceBackup module needs to be replaced. But
valves can be operated.
FailureBackup module does not work. Controller
can still operate valves. But at a power
Green on
Red o
Green ashing. 1 Hz
Red o
Green: Ready or Charge
Red on.
Green o
Red ashing. 1Hz
loss no guarantee that the valves can
close.
Cable length
EKE 2U supports the following max. cable length.
Cable length
[m]
Wire size min. / max.
[mm2]
Power supply Inputmax. 50.2 / 1.5
Backup outputmax. 50.2 / 1.5
Digital outputsmax. 50.2 / 1.5
Cable and wiring
• Keep power and battery backup cable separate from SOH cable
-Max duty-cycle Charge/Discharge at nominal load 15min ON / 10s OFF
-To be integrated in Class I and/or II appliances
-Index of protection: IP 20
-Period of electric stress across insulating parts: long
-Suitable for using in a normal pollution environment
-Immunity against voltage surges: category II
Safety and approvals
This product is designed to comply with the following standards:
-EN61000-6-1, EN61000-6-3 (immunity for residential, commercial and light-industrial environments)
-EN61000-6-2, EN61000-6-4 (immunity and emission standard for industrial environments)
-UL 61010
-IEC 61010-2-201:2013
General warnings
-Every use that is not described in this manual is considered incorrect and is not authorized by the
manufacturer
-Verify that the installation and operating conditions of the device respect those specied in the
manual, especially concerning the supply voltage and environmental conditions
-This device contains live electrical components. All service and maintenance operations must therefore
be performed by qualied personnel
-The device must not be used as a safety device
-Liability for injury or damage caused by the incorrect use of the device lies solely with the user
-The manufacture’s guarantee expires in the event of improper use
Installation warnings
-Intended mounting position: vertical
-Installation must comply with local standards and legislation
-Before working on the electrical connections, disconnect the device from the main power supply
-Before carrying out any maintenance operations on the device, disconnect all electrical connections
-For safety reasons the appliance must be tted inside an electrical panel with no live parts accessible
-Do not expose the device to continuous water sprays or to a relative humidity greater than 90%
-Avoid exposure to corrosive or pollutant gases, natural elements, environments where explosives or mixes
of ammable gases are present, dust, strong vibrations or shock, large and rapid uctuations in ambient
temperature that might cause condensation in combination with high humidity, strong magnetic and/or
radio interference (e.g. transmitting antennae)
-When connecting loads be aware of the maximum current for each relay and connector
-Use cable ends suitable for the corresponding connectors. After tightening connector screws, tug the cables
gently to check their tightness
-Use appropriate data communication cables. Refer to the EKE data sheet for the kind of cable to be used and
setup recommendations
-Minimize the length of probe and digital input cables as much as possible and avoid spiral routes around
power devices. Separate from inductive loads and power cables to avoid possible electromagnetic noises
-Avoid touching or nearly touching the electronic components tted on the board to avoid
electrostatic discharges
-Use copper cables for operating temperatures >75 °C (ambient temperature ≤ 60 °C)
Product warnings
• Use a class II category transformer for 24 V AC power supply
• Connecting any output signals to mains voltage will permanently damage the controller
The unit can be mounted onto a 35 mm DIN rail simply by snapping it into place and securing it with a
stopper to prevent sliding. It is demounted by gently pulling the stirrup located in the base of the housing.
1
2
“Click”
3
Sharing Power supply and SOH signal
• Power sharing is allowed between EKE 2U power backup module and EKE SH controllers provided
power supply is DC.
• Max 2 EKE controller should be connected to 1 EKE 2U
• SOH signal should not be shared. It should be connected to only one EKE controller and the readouts
should be taken from this controller.
Quick guide for parameter selection in EKE controllers
Start : Main switch= O
Select DI2 conguration
Battery Alarm
Actual bat tery voltage
read out
Power backup status
readout
Dl1= ON
Make sure that main switch is OFF before changing the settings. The setting will depend on the
system requirement.
Parameter: R012 Main Switch
Set DI2 to PWR backup status. This should be used
only if EKE 2U SOH is connected to DI2 of EKE 1.
Enables EKE 1to read SOH signal.
Parameter: O022 DI2 conguration
Batter y alarm function must be set ON/OFF
depending on the signal needed. If set to On then
EKE 1 will send alarm if EKE 2U batter y is low.
Parameter: A034 Battery alarm
Using parameter U101 actual battery voltage of
EKE 2U can be read through EKE 1.
Parameter: U101 Actual battery voltage
Using parameter U115. Power backup status of
EKE 2U can be read from EKE 1. Only applicable if
SOH is connected to DI2.
Parameter: U115 PWR Backup status
Set main switch back to ON status to start the
controller.
Parameter: R012 Main switch
Related products
Power SupplyEKEseries controllersStepper motor valves
AK-PS
Input: 100 – 240 V AC, 45 – 65 Hz
Output: 24 V DC: available with 18 VA, 36 VA
and 60 VA
ACCTRD
Input: 230 V AC, 50 – 60 Hz
Output: 24 V AC, available with 12 VA,
22 VA and 35 VA