2 Instructions RI8HU352 © Danfoss 12/2004 EKC 531D1
Data communication
All inputs are low-voltage.
All relay outputs may be
high-voltage.
Brine cooling
Connections
Necessary connections
Terminals:
1-2 Supply voltage 24 V a.c.
4- 19 Relay outputs for either compressors, unloaders or
fan motors
22-24 Alarm relay *
There is connection between 22 and 24 in alarm situa tions
and when the controller is dead
27-28 24 V signal to start / stop of regulation
27-29 24 V signal from the safety circuit DO 1
27-30 24 V signal from the safety circuit DO 2
27-31 24 V signal from the safety circuit DO 3
27-32 24 V signal from the safety circuit DO 4
27-33 24 V signal from the safety circuit DO 5
27-34 24 V signal from the safety circuit DO 6
27-35 24 V signal from the safety circuit DO 7
27-36 24 V signal from the safety circuit DO 8
57-59 Suction pressure. Voltage signal from AKS 32R **
60-62 Condenser pressure. Voltage signal from AKS 32R **
54-55 Out temperature (Sc3). Sensor signal from AKS 11,
AKS 12 or EKS 111
Application dependent connections
20-21 AKD start/stop *
The relay cutin when the frequency converter have to
start.
37-38 Voltage signal to external condenser control
39-41 Possibility of connecting an external display type
EKA 161 for display of Pc
42-44 Possibility of connecting an external display type
EKA 161 for display of P0, or EKA 162 for operation and
display of P0
45-46 Contact function for alarm signal
45-47 Contact function for alarm signal
48-49 Contact function for alarm signal
48-50 Contact function for displacement of the suction
pressure reference or for alarm signal.
51-52 Contact function for displacement of the condenser
pressure reference or for alarm signal.
51-53 Separate sensor Saux1. Sensor signal fra AKS 11,
AKS 12 or EKS 111
54-56 Air temperature at condenser outlet. Sensor signal
from AKS 11, AKS 12 or EKS 111
Data communication
25-26 Mount only, if a data communication module has
been mounted.
For ethernet communication the plug connection RJ45
must be used. (LON FTT10 can also be connected in this
way.
It is important that the installation of the data commu-
nication cable be done correctly. Cf. separate literature
No. RC8AC..
The termination bracket is placed to the right of
terminal 26.
If an output is used for an unloader it is
not neccessary to wire the belonging
safety circuit.
*) Relays DO9 and DO10 may in special cases be reconfi gurated so that they can be
used as fan relays.
**)
• If the controller has to control only the comrpessor or the fans, respectively Pc and
Pc sensor can be dispensed
• In brine systems temperature measurement at terminals 57-58 and 60-61 may be
used instead of pressure measurement with AKS 32R. See also o06.
Unloader
ENGLISH
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