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Preface to design
Be aware of the following when the number of extension modules
is being planned. A signal may have to be changed, so that an ad-
ditional module may be avoided.
• An ON/OFF signal can be received in two ways. Either as a
contact signal on an analog input or as voltage on a low or high-
voltage module.
• An ON/OFF output signal can be given in two ways. Either with a
relay switch or with solid state. The primary difference is the per-
mitted load and that the relay switch contains a cutout switch.
Mentioned below are a number of functions and connections that
may have to be considered when a regulation has to be planned.
There are more functions in the controller than the ones men-
tioned here, but those mentioned have been included in order
that the need for connections can be established.
Functions
Clock function
Clock function and change-over between summer time and win-
ter time are contained in the controller.
The clock is zeroset when there is power failure.
The clock's setting is maintained if the controller is linked up in a
network with a gateway, a system manager or a clock module can
be mounted in the controller.
Start/stop of regulation
Regulation can be started and stopped via the software. External
start/stop can also be connected.
Warning
The function stops all regulation.
Excess pressure can lead to a loss of charge.
Start/stop of compressors
External start/stop can be connected.
Alarm function
If the alarm is to be sent to a signal transmitter, a relay output will
have to be used.
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Capacity controller RS8GN202 © Danfoss 11-2013
I'm alive function
A relay can be reserved which is pulled during normal regulation.
The relay will be released if the regulation stops with the main
switch or if the controller fails.
Extra temperature sensors and pressure sensors
If additional measurements have to be carried out beyond the
regulation, sensors can be connected to the analog inputs.
Forced control
The software contains a forced control option. If an extension
module with relay outputs is used, the module's top part can be
with change-over switches – switches that can override the indi-
vidual relays into either OFF or ON position.
Wiring should be done with a safety relay. See Regulating func-
tions.
Data communication
The controller module has terminals for LON data communication.
The requirements to the installation are described in a separate
document.
AK-PC 783
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