34
RS8HP102 © Danfoss 2018-09
AK-CC 750A
Data from this example is used in the planning table on the
next page.
The result is that the following modules should be used:
• AK-CC 750A controller
• AK-XM 101A
• 3 pcs. EKA 163B
If the result had demonstrated that an additional output was
needed, AK-XM 205A or B would have been the required exten-
sion.
3
Connections
Here is a survey of the possible connections. The texts can be read
in context with the planning table in point 4.
Analog inputs
Temperature sensors each section
• S3 air sensor at evaporator inlet
• S4 air sensor at evaporator outlet (one of the S3/S4 sensors may
be omitted)
.• S5 defrost sensor. Two may be used for long sections
• Product sensor. Extra sensor that only checks the product tem-
perature
• S2 gas sensor at evaporator outlet (control of AKV valve).
• Saux 1-4, extra sensors, which can be used for general
thermostats or monitoring.
Pressure transmitters
• P0 For registration of the evaporating pressure (control of AKV
valve).
• Pc For registration of the condensing pressure. Can be used in
connection with adaptive defrost, or the signal can be received
via data communication.
• Paux 1-3, extra transmitters, which can be used for general
pressostats or monitoring.
A pressure transmitter type AKS 32R can supply signals to five
controllers
Voltage signal
Ext. Ref. is used if the thermostat reference is to be displaced
with a signal from another control.
• General 0-10 V inputs. Up to 5 inputs, which can be used for
monitoring and alarm function.
On/Off-inputs
Contact function
(on an analog input) or
voltage signal
(on an
extension module)
• External start/stop of regulation
• Pulse pressure (on a analogue input) used for the ”appliance
cleaning” function
• Switch for changeover between two temperature referenc
• Inject ON. Signal from a compressor control
• Pulse pressure (on a analogue input) for start of defrost
• Pulse pressure (on a analogue input) for opening/closing Night
blind
• Door switch in coldroom
• External day/night signal (raises the temperature reference when
Night blind is used)
• Up to 10 general DI inputs for signals from other automatic con-
trols serving to activate the controller’s alarm function
On/off-output
Relay outputs
• Defrost (one each section)
• Rail heat
• Fan motor
• Light
• Compressor (demand on cooling)
• Alarm relay
• Solenoid valve (EVR)
• Drain valve, Suction line valve
• Night blind
• Drip tray heat recovery
• General functions
AKV Solid state outputs
The solid state outputs on the controller module are primarily
used for AKV valves, but may also be used for the functions men-
tioned under ”relay outputs”.
(The output will always be “OFF” when the controller is hit by
power failure).
Analog output
• 0-10 V signal for valve regulation or fan with EC motor
• Stepper signal to ETS/CCMT valve
Example
• Freezing appliance with three sections
• AKV is used for injections (S2 and P0)
• Electric defrost with stop based on temperature (S5)
• Two thermostat sensors per section (S3 and S4)
• Control of fans and rail heat
• External start/stop (Main switch)
• Switch signal for appliance cleaning
• 3 display for monitoring of appliance temperature
