Danfoss AK-PC 560 User Manual page 2

Introduction
Application
The controller is used for capacity regulation of compressors or
condensers in small refrigerating systems.
Two outputs are dedicated to a digital scroll compressor. The other
compressors and condensers can be connected, as required.
If more outputs than the 8 on the controller are required, extra ones
can be connected via an external relay module.
Advantages
• Digital scroll compressor control
• Sequential or cyclic operation
• Possibility of suction pressure optimization via the data commu-
nication
Regulation
Regulation is based on signals from one pressure transmitter for
the compressor regulation and one pressure transmitter for the
condenser regulation plus one temperature sensor for the air
temperature before the condenser.
• Pressure regulation P0
• Pressure regulation Pc
• Pressure regulation with variable reference (Sc3)
Functions
• Pulse width modulated signal for controlling a digital scroll com-
pressor
• Relays for compressor and condenser regulation
• Voltage output for capacity regulation of condenser
• Status inputs. An interrupted signal indicates that the safety circuit
has been activated and the respective circuit stopped
• Temperature monitoring of the digital scroll compressor
• Contact inputs for indication of alarms
• Contact inputs for displacement of references or for indication of
alarms
• Alarm relay
• External start/stop of regulation
• Possibility of data communication
Operation
All operation takes place either via data communication or via
connection of a display type EKA 164 or EKA 165.
Combinations
The controller has ten relay outputs two of which have been
reserved for the digital scroll and two other for the alarm function
and for the "AKD start/stop" function.
For a start relays are reserved for compressor capacities starting
from DO1, DO2, etc.
The remaining relays up to and including DO8 will then be available
for fans. If more are required, one or more relay modules type
EKC 331 with max. eight steps can be connected. The signals to
these modules are to be taken from the controller's analog output.
Another solution could be that the fan speed is controlled via the
analog output and a frequency converter.
If the alarm function and the "AKD start/stop" function are left out,
all ten relay outputs may be used for compressors and fans (but
max. seven for compressors and max. eight fans).
2 Manual RS8GE202 © Danfoss 01-2016
Compressors connections can
be seen on page 11.
AK-PC 560