Connections; Limitations - Danfoss AK-LM 330 Design Manual

Connections

In principle there are the following types of connections:
Analog inputs "AI"
This signal must be connected to two
terminals.
Signals can be received from the following
sources:
• Temperature signal from Pt 1000 ohm
temperature sensor
• Contact signal where the input is short-
circuited or "opened", respectively
• Voltage signal from 0 to 10 V
• Signal from pressure transmitter AKS 32,
AKS 32R or AKS 2050.
The supply voltage is supplied from the
module's terminal board where there is
both a 5 V supply and a 12 V supply.
When programming the pressure
transmitter's pressure range must be set.
ON/OFF voltage inputs "DI"
This signal must be connected to two
terminals.
• The signal must have two levels, either 0 V
or "voltage" on the input.
There are two different extension
modules for this signal type:
- low-voltage signals, e.g. 24 V
- high-voltage signals, e.g. 230 V
When programming the function must be set:
• Active when the input is without voltage
• Active when voltage is applied to the
input.

Limitations

As the system is very flexible regarding the number of connected
units you must check whether your selection complies with the
few limitations there are.
The complexity of the controller is determined by the software,
the size of the processor, and the size of the memory. It provides
the controller with a certain number of connections from which
data can be downloaded, and others where coupling with relays
can be performed.
AK-LM 330 RS8FR302 © Danfoss 2015-08
ON/OFF output signals "DO"
There are two types, as follows:
• Relay outputs
All relay outputs are with change-over
relay so that the required function can be
obtained when the controller is without
voltage.
• Solid state outputs
Primarily for AKV valves that switch fre-
quently, but the output can connect an
external relay as well as a relay output.
The output is only found on the
controller module.
When programming the function must be set:
• Active when the output is activated
• Active when the output is not activated.
Pulse counter inputs "CI"
This signal must be used if consumption
measurement is to take place.
✔ The sum of connections cannot exceed 80.
✔ The number of extension modules must be limited so that the
total power will not exceed 32 VA (including controller).
✔ No more than five pressure transmitters may be connected to
one controller module.
✔ No more than five pressure transmitters may be connected to
one extension module.
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