Specifications
140 RK0YG302 © Danfoss 05/2007
Accessories
IO modules for the AK series
Introduction
One of the control series can be expanded as the size of the
system is increased. It has been developed for refrigeration control
systems, but not for any specic application – variation is created
through the read-in software and the way you choose to dene
the connections.
It is the same modules that are used for each regulation and the
composition can be changed, as required. With these modules
(building blocks) it is possible to create a multitude of various
kinds of regulations. But it is you who must help adjusting the
regulation to the actual needs – these instructions will assist
you to nd your way through all the open questions so that the
regulation can be dened and the connections made.
Programming and setup of the controller will take place at a later
time.
Application
Controller for refrigeration control systems. See e.g. the regula-
tions:
• Capacity regulation of compressor and condenser groups
• Evaporator control of freezing and refrigeration appliances
• Network control
Advantages
• The controller’s size can “grow” as systems grow
• The software can be set for one or more regulations
• Several regulations with the same components
• Extension-friendly when systems requirements are changed
• Flexible concept:
- Controller series with common construction
- One principle – many regulation uses
- Modules are selected for the actual connection requirements
- The same modules are used from regulation to regulation
Principles
• Controller module – capable of handling minor plant require-
ments.
• Extension modules.
When the complexity becomes greater and additional inputs or
outputs are required, modules can be attached to the controller.
A plug on the side of the module will transmit the supply voltage
and data communication between the modules.
• Upper part
The upper part of the controller module contains the
intelligence. This is the unit where the regulation is dened and
where data communication is connected to other controllers in a
bigger network.
• Connection types
There are various types of inputs and outputs. One type may, for
example, receive signals from sensors and switches, another may
receive a voltage signal, and a third type may be outputs with
relays etc. The individual types are shown in the table next to.
• Optional connection
When a regulation is planned (set up) it will generate a need for
a number of connections distributed on the mentioned types.
This connection must then be made on either the controller
module or an extension module. The only thing to be observed
is that the types must not be mixed (an analog input signal must
for instance not be connected to a digital input).
• Programming of connections
The controller must know where you connect the individual
input and output signals. This takes place in a later conguration
where each individual connection is dened based on the fol-
lowing principle:
- to which module
- at which point (”terminals”)
- what is connected (e.g. pressure transmitter/type/
pressure range)
IO moduler