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Cable and wiring
• The 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. In general, for the cable distance upto
10 m, it is recommended to use cable with wire size 22AWG or lower. For cable distance up to 30 m, wire diameter
of 20 AWG or lower is recommended.
• In case of electrical noises in the system, use cable filter AK 211.
• Keep controller and sensor wiring well separated from mains wiring. Minimum recommended distance 30mm.
• Connecting sensors by wires more than 6 m long may decrease the accuracy of measured values.
• Sensors and secondary (output) of transformer may not be grounded simultaneously.
Warning
Separate the sensor and digital input cables as much as possible (at least 3 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).
Connecting external display EKA 164A
To setup the EKD 316C an EKA 164A display is needed. The display can be used not only for setting up the
necessary parameter but also to use as an external display during operating to show the important
parameters i.e. opening degree of the valve, superheat etc.
EKA 164A
L = max. 30 m
Important Note:
•
Max. distance between controller and display is 30 m.
•
The supply voltage to the display must be maintained at 12 V ± 15%.
•
Terminal resistor of 120 Ohm is recomanded at both sides of the wire for
length longer than 1 m to prevent electrical noice.
Connecting Modbus
• For the modbus cable, it is best to use 24 AWG shielded twisted-pair cable with a shunt capacitance of
16 pF/ft and 100Ω impedance.
• The controller provides an insulated RS485 communication interface which is connected to terminals 9 to 11
(see connection overview).
• The max. permissible number of devices simultaneously connected to RS485 output is 32 of full load device.
The maximum length of RS485 cable is 1000 m.
• Termination resistors 120 Ohm for terminal devices are recommended for length > 1 m.
In EKD 316C communication frequency (baudrate) can be one of the following:
9600 baud, 19200 baud and 38400 baud.
• The only available fixed communication settings in EKD 316C are 8 data bit, EVEN parity and 1 stop bit.
The default unit address is 240 which, can be changed using parameter "03 unit address".
Detail explanation on Modbus installation and software parameter setting can be found on
Installation guide RC8AC602 and manual DKRCC.PS.RI0.F1.02.
DKRCC.PI.RR0.A3.02
EKD 316 C
Danfoss
84N404.10
EKA 164A
R
R = 120 Ohm, min. 0.25 Watt
Modbus
A+
B-
Not in use
Gnd
© Danfoss A/S (AC-MCI / sw), 2016-12
R
B-
A+
12 V
9
10
11
12
13
EKD 316C
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