Danfoss AK-PC 551

14 Technical brochure RC8CF102 © Danfoss 08-2014 AK-PC 551
Press ENTER to select
digital and analog I/O
Press ENTER to select
I/O conguration
Main menu IO conguration menu
Digital outputs Digital inputs Analog outputs Analog inputs
Example: Check IO conguration
Wizard assignment of inputs and outputs (I/0)
Once the wizard is applied, the IO functions are automatically
assigned to hardware inputs and outputs�
The screens below shows how the IO functions are assigned
according to the example�
Assignment of inputs and outputs
The table indicates rules for assignment of inputs and outputs via the wizard�
* Special features to be enabled through conguration screens. Not part of the wizard setup.
Digital outputs (DO1-DO8) Digital inputs (DI1-DI8) Analog outputs (AO3 – AO4) Analog inputs(AI1-AI8)
PWM outputs for capacity
control of Digital scroll or
Stream 4 compressor are placed
on the solid state relays DO5
and DO6
Compressor safety inputs for
respectively suction group A
and B
Speed control of compressor
for respectively suction group A
and B
PoA og PoB suctionpressure are
placed on AI1 and AI2
Starting from DO1: Fan safety inputs Speed control of condenser Pc condensing pressure is
placed on AI3
Compressor start relays
followed by unloading valves
for respectively suction group
A and B
External Main switch (ON/
OFF) *
Sc3 outdoor temperature is
placed on AI4
Condenser fan HP safety switch* S4A and S4B suction media
temperature sensors *
Injection ON for A/B * LP safety switch * S7 condenser media
temperature sensor *
Alarm relay Night setback * Sd komp� 1 discharge temp�
sensor for digital scroll/Stream
compressor for suction A and B
Heat recovery * Ss suction gas temperature for
suction group A and B *
Load shedding * Sd discharge temperature for
suction A and B *
General alarm inputs 1-3 * Saux for general thermostat *