Danfoss EKF 1A, EKF 2A User guide
User Guide
Stepper valve driver
Type EKF 1A, EKF 2A
Driver for stepper motor valves SW V1.24
Stepper valve driver, type EKF 1A, EKF 2A
Introduction
Stepper valve driver EKF series is used where stepper valves must be accurately controlled typically in commercial
air conditioning, heat pumps, commercial refrigeration and food retail applications.
Features
• Support both Bipolar and Unipolar stepper motor valves
• Driven by analog input signal
• Fast installation and setup
• Lost step prevention
• Open circuit detection
• LED indication for valve movement and alarm/warnings
• On board DIP switch for quick selection
• Plug and play
• 4 pole terminal block and JST-XHP 5 pin connections
• Phoenix connector terminals
• Digital output for alarm signal
• 1 and 2 valve driver version available
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Features
EKF 1A
EKF 2A
Code number
080G5030
080G5035
Power supply
24 V AC/DC
24 V AC/DC
Number of valves
1 stepper motor valve
2 stepper motor valves
Valve type
Unipolar/Bipolar
Unipolar/Bipolar
Analog inputs
1
2
Digital outputs
1
1
Dip switch
1
2
Battery backup support
Yes
Yes
Mounting
35 mm, 4 DIN
35 mm, 4 DIN
Dimension (H x W)(mm)
110 x 70
110 x 70
EKE 2U Backup power module
Power supply
EKE 2U Backup power module ensures sucient power in case of power failures
to the controller / driver to ensure closure of the electronic 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
Stepper valve driver, type EKF 1A, EKF 2A
Portfolio overview
Table 1: Portfolio overview
Table 2: Related Products
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AI1
AI2
Unit
programmable
controller
ETS Colibri
AI1
Digital out
ETS Colibri
AI1
AI2
ETS Colibri
Digital out
Unit
programmable
controller
Analog input signal 1
Analog input signal 2
Stepper valve driver, type EKF 1A, EKF 2A
Applications
EKF series stepper valve drivers can be used in application where accurate control of stepper motor valves are
needed using analog input signals (0-10V, 0-5V, 4-20 mA, 0-20 mA) from unit programmable controllers. The
product can be used for both Bipolar and Unipolar type valves. General applications include use in commercial air
conditioning, heat pumps, commercial refrigeration and food retail application
Figure 1: EKF 1A
Figure 2: EKF 2A
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Either JST or 4
pin should be
used
JST XHP 5
pin for ETS
5m & ETS 6
M12 cable from
stepper motor
to 4 pin
terminal
For stepper Valve 1
output
stepper Valve 1 DIP
SWITCH
EKE 2U Battery Backup
Koolkey
24V ± 20%
AC/DC
supply
source
Battery connection
KoollProg PC tool
Digital Output (DO) -> Relay/PLC
Analog Input (Al1), [0-5V, 0-10V, 0-20mA, 4-20mA
M12 cable from
stepper motor
to 4 pin
terminal
Either JST or 4
pin should be
used
JST XHP 5 pin
for ETS 5m &
ETS 6
For stepper Valve 1
output
stepper Valve 1 DIP
SWITCH
24V ± 20%
AC/DC
supply
source
Battery connection
KoollProg PC tool
Koolkey
Digital Output (DO) -> Relay/PLC
Analog Input (Al1), [0-5V, 0-10V, 0-20mA, 4-20mA
Analog Input (Al2), [0-5V, 0-10V, 0-20mA, 4-20mA
For stepper Valve 2
output
stepper Valve 2 DIP
SWITCH
Stepper valve driver, type EKF 1A, EKF 2A
Installation
Wiring terminals
Figure 3: EKF 1A
Figure 4: EKF 2A
NOTE:
There are both 4 pin terminal and JST 5 pin terminal available on the board per stepper drive output.
Only one of the terminals should be used per valve.
Do not connect valves to both 4 pin terminal and JST terminal of the same stepper driver output.
Power sharing
EKF can share power from the same source with a battery backup or unit controller only if battery backup/unit
controller ports are galvanically isolated.
Danfoss recommends to use EKE 2U as the preferred battery backup device.
NOTE:
EKE 2U can only support 2 valves for emergency closing, thus EKE 2U should not be shared with more than one EKF
2A or more than two EKF 1A.
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Switch numbers
Selection
Switch 1-5
Valve selection
Switch 6
Analog sharing selection
Switch 7 & 8
Analog signal selection
Stepper valve driver, type EKF 1A, EKF 2A
Conguration
EKF can be congured using
1.
DIP switch
2.
Koolkey & KoolProg PC tool
DIP Switch conguration
The basic product conguration can be done through DIP switch present on the hardware.
EKF 1A supports 1 stepper drive output and 1 Dip switch for settings.
EKF 2A supports 2 stepper drive output and 2 Dip switch for settings.
Figure 5: DIP switch
The image above shows a schematic of a dip switch
Each DIP switch consists of 8 switches.
The below table shows what each Dip switch section represents.
Table 3: Dip switch section
Steps to follow to congure EKF using Dip switch:
1.
Disconnect the EKF from power supply.
2.
Connect the valves and AI inputs to EKF.
3.
Make the needed settings on the EKF dip switch.
4.
Turn the power back on to EKF.
5.
EKF is ready to use with the new settings
NOTE:
Any changes made to EKF dip switch while EKF is powered ON will result in warning and the new settings are not
active. In case of the above error switch the power OFF and then ON the EKF. The newly made settings will now be
active.
The tables below can be used to help select dip switch positions.
Valve selection (Switch 1-5)
Green denotes ON position of DIP switch
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Valve
DIP Switch
1 2 3 4 5 6 7 8
A
No Valve (Default)
B
ETS 12C, ETS 24C, ETS 25C, ETS 50C, ETS 100C, KVS 2C,
KVS 3C, KVS 5C
C
ETS 5M
D
ETS 6, UKV, UKV-J
E
ETS12.5, ETS 25, ETS 50, KVS15
F
ETS 100
G
ETS 250, ETS 400, KVS 42
H
Manifold Valves (ETS 500P, E TS 800P)
I
JKV
J
CCMT 2, CCMT4, CCMT8
K
CCMT 16
L
CCMT 24
M
CCMT30
N
CCMT 42
O
CCM 10, CCM 20, CCM 30
P
CCM 40
Q
CTR 20
R
CCMT 3L, CCMT 5L, CCMT 8L, CCMT 10L
S
ETS 175L, ETS 250L
Analog Input DIP Switch
1 2 3 4 5 6 7 8
0 - 10 V (Default)
0 - 5 V
4 - 20 mA
0 - 20 mA
Stepper driver 1
DIP Switch
1 2 3 4 5 6 7 8
Analog Input AI1
Analog input AI2
Stepper driver 2
DIP Switch
1 2 3 4 5 6 7 8
Analog Input AI1
Analog input AI2
Stepper valve driver, type EKF 1A, EKF 2A
Figure 6: DIP valve section
NOTE:
Only applicable for EKF 2A When using Manifold valves.
Dip switch 1 for stepper driver 1 should be selected to base valve type.
Eg: ETS C should be selected in Dip switch 1 if ETS Colibri is used in manifold operation.
ETS 250/400 should be selected if using ETS 500P/ETS 800P.
Dip switch 2 for stepper driver 2 should be selected as manifold valve (Group H).
While setting Dip switch 2 as manifold valve EKF automatically recognize that it is using only 1 Analog input to
control both valves and by default AI1 is used as the analog input. Analog sharing function is automatically
activated.
Analog input selection (Switch 7 & 8)
Green denotes ON position of DIP switch
Figure 7: DIP analog input selection
Analog sharing selection (Switch 6)
Green denotes ON position of DIP switch
Figure 8: DIP analog sharing selection
NOTE:
Analog sharing is used only in EKF 2A.
Analog sharing can be done to run 2 valves using the same analog input.
If stepper driver 1 should use analog input from AI2 (AI2 is meant for stepper driver 2 analog input).
Then Dip switch 1 should have switch 6 at position ON.
EKF 2A will then use AI2 signal to control stepper valve 1.
If stepper driver 2 should use analog input from AI1 (AI1 is meant for stepper driver 1 analog input).
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