Danfoss EKE 1A User Manual page 13

Superheat controller and stepper valve driver, Type EKE 1A, 1B, 1C, 1D
 NOTE:
• EKE 2U Backup power module is recommended to ensure closure of the electronic valves. in case of power failures
• If Dl1(On/O ) switch is not used it must be short circuited
3.4 Cabling lengths for di erent connections
Considerations:
• The max. cable distance between the controller and the valve depends on many factors like shielded/unshielded
cable, the wire size used in the cable, the output power for the controller and EMC.
• Keep controller and sensor wiring well separated from mains wiring.
• Connecting sensors by wires more than the speci ed length may decrease the accuracy of measured values.
• Separate the sensor and digital input cables as much as possible (at least 10 cm) from the power cables to the
loads to avoid possible electromagnetic disturbance. Never lay power cables and probe cables in the same
conduits (including those in the electrical panels).
• For the CANbus cable, it is best to use 24 AWG shielded twisted-pair cable with a shunt capacitance of 16 pF/ft and
100 Ω impedance.
• The controller provides a communication interface which is connected to the RJ and CAN terminals.
• Terminal resistors 120 Ω for terminal devices are recommended at both ends of the bus ( rst and last node)
Terminal resistance between H and R terminals.
Table 11: EKE controller supports the following max. cable length
Inputs
Analog inputs (Current/Voltage)
Temperature sensor
Stepper valve connection
Power supply
Digital input
Digital output
Digital MMI
Communication bus
• All valves are driven with a 24 V supply chopped to control the current (Current driver).
• The stepper motor is connected to the "Stepper Valve" terminals (see terminal assignment) with Danfoss M12
connection cable.
• To con gure stepper motor valves other than Danfoss stepper motor valves, the correct valve parameters must be
set as described in the Valve con guration section (see the con guration section for details).
• The correct valve must be de ned in "Valve con guration", i.e., parameter I067.
Table 12: Valve Cable Connection
Stepper valve connector
A1
A2
B1
B2
Not connected
 WARNING:
1. All valves are driven in a bipolar mode with a 24 V supply chopped to control the current (Current driver).
2. The stepper motor is connected to the "Stepper Valve" terminals (see terminal assignment) with a standard M12
connection cable.
3. To con gure stepper motor valves other than Danfoss stepper motor valves, the correct valve parameters must
be set as described in the Valve con guration section by selecting user de ned valve.
Guideline for long M12 cables on Danfoss stepper motor valves
1. Long cables will lead to degradation of performance.
2. This guideline is based on the cable type being the same type as the standard Danfoss stepper motor cable.
© Danfoss | Climate Solutions | 2024.08
Cable length
max. 10 m
max. 10 m
max. 30 m
max. 5 m
max. 10 m
-
max. 3 m over CAN RJ
max. 1000 m
ETS/KVS/CCM/ CCMT/CTR/ CCMT L
(Using Danfoss M12 Cable)
White
Black
Red
Green
-
Wire size (Min. / Max.)
2
0.14 /1.5 mm
-
2
0.14 /1.5 mm
2
0.2 /2.5 mm
2
0.14 /1.5 mm
0.2 /2.5 mm 2
-
2
0.14 /1.5 mm
ETS 8M Bipolar
Orange
Yellow
Red
Black
-
BC398828796060en-000103 | 13
ETS 6
Orange
Yellow
Red
Black
Grey