Danfoss EKF 1A, EKF 2A Installation guide
Installation guide
Stepper Valve Driver
Type EKF 1A, EKF 2A
Introduction
Stepper Valve Driver EKF series is for use where stepper motor valves must be accurately controlled,
typically in commercial air conditioning, heat pumps, commercial refrigeration and food retailing
080R0435
applications.
Technical Specificatons
Supply voltage EKF 1A: 24 V AC / DC 50 / 60 Hz
EKF 2A: 24 V AC / DC, 50 / 60 Hz
Power consumption Idle operating: < 1 W (without valve)
Power consumption for using 1 valve.
CCMT 16 – CCMT 42: 25 VA / 15 W
ETS 5M, ETS 6: 20 VA / 10 W
ETS 12C – ETS 100C, KVS C: 30 VA /15 W
ETS 12.5 – 400: 10 VA / 5 W
ETS 500P, 800P: 28 VA / 20 W
CCMT 2- CCMT 8: 10 VA / 5 W
CTR 20: 14 VA / 10 W
CCMT L: 20 VA / 10 W
When using two valves sum the power consumption of each valve.
Analog inputs
EKF 1A: 1 input AI1 0-5 V, 0-10 V, 4-20 mA, 0-20 mA
080R0435
EKF 2A: 2 inputs AI1 and AI2 0-5 V, 0-10 V, 4-20 mA, 0-20 mA
Max. 15 V Analog input voltage. Do not connect voltage sources to unpowered units
without limiting the current to analog inputs (overall 40 mA per input).
Input Impedance: >50 kΩ (Voltage Input) 120 Ω ± 2% (Current Input)
Digital outputs 1 output for EKF1A / EKF 2A: D01 (open collector), sink current max 10 mA
Valve support EKF 1A: 1 stepper motor valve output, EKF 2A: 2 stepper motor valve output
STEPPER 1: A1, A2, B1, B2
STEPPER 2: A1, A2, B1, B2
Bipolar and unipolar stepper motor output:
- Danfoss ETS/ ETS L/ KVS/ ETS C/ KVS C/ CCMT 2 – CCMT 42/ CTR/ CCM/ CCMT L Valves
- ETS 6/ ETS 5M Valves
Open circuit HW diagnostics is present.
Battery backup 1 input for EKF 1A / EKF2A: Vbat
BAT, GND: Nominal 18 – 24 V DC, Min 16 V DC - Max 28 V DC (EKE 2U
recommended)
Max. battery current: 2 A at 18 V (valve depended)
Battery alarm/warning will be activated below 16 V DC.
Enviroment
DIN Mounting 4 DIN
Storage -30 – 80 °C / -22 – 176 °F
Operating -20 – 60 °C / -4 – 140 °F
Humidity < 90% RH, non-condensing
Імпортер:ТОВ з іі "Данфосс ТОВ" 04080, Київ 80, п/с 168, Україна
© Danfoss | Climate Solutions | 2022.01
Info for UK customers only: Danfoss Ltd., 22 Wycombe End, HP9 1NB, GB
AN375548103097en-000204 | 1
Application
Valve Driver
EKF 1A
ETS Colibri
Connection overview
EKF 1A
1 2 3 4
Analog signal AI1
Digital out
Wire Color scheme
1Green
2 Red
3 Black
4 White
EKF 2A
EKF 2A
ETS Colibri
ETS Colibri
1 2 3 4
1 2 3 4
AI 1
AI 2
Digital out
Dip Switch
Dip Switch1
Dip Switch2
AI1 Analog input 1
COM Common
Koolkey
AI2 Analog input 2 for EKF2A only
Koolkey
COM Common
Koolprog pc tool
DO1 Digital output 1
Koolprog pc tool
• Supports both Bipolar and Unipolar motor.
• Only one connection can be used, either 4 pole terminal block or JST XHP-5 pin connector.
• It is possible to share power supply with 2 EKF and battery backup if battery backup is galvanic isolated and the polarity of power
supply is maintained correct. The same should be observed while sharing power supply with EKF and master controller (AI signal)•
• Connect PE either to the or of power connector. If grounding is done in the transformer do not use EKF grounding connector.
2 | AN375548103097en-000204
© Danfoss | Climate Solutions | 2022.01
Quick set up guide
1. Disconnect power to EKF.
2. Connect Valve and Analog signal to the dedicated terminals. Select the Valve via DIP switch 1 to 5.
3. Select the required Analog signal input via DIP switch 7 and 8. For EKF 2A, perform 3 and 4 for both DIP switches.
4. Connect EKF to power and the device is ready to use
LED indication
Valve
LED for Error/Alarm
LED for Stepper 1
Valve
Two status LED per valve output
Each stepper drive has a set of Red and Green LED
as shown in image. The change in LED light with
the LED indication table can help determine the
valve movement.
RED
RED
GREEN
GREEN
RED
GREEN
RED
GREEN
0s
Power by Koolkey, no valve operation
1s
Valve movement
Valve open circuit
2s
Valve closed
Valve closing
Valve idle on target
Valve idle on target
Valve opening
Valve open
LED for Stepper 2
3 | AN375548103097en-000204
© Danfoss | Climate Solutions | 2022.01
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