Illustration 3.13: Principle Diagram For Analog I/O Mounted In Frequency Converter - Danfoss VLT Series Design Manual

3. VLT HVAC Selection
3.8.9. Analog I/O option MCB 109
The Analog I/O card is supposed to be used in e.g. the following cases:
•
•
3
•
•

Illustration 3.13: Principle diagram for Analog I/O mounted in frequency converter.

Analog I/O configuration
3 x Analog Inputs, capable of handling following:
•
OR
•
•
•
3 x Analog Outputs supplying 0-10 VDC.
74
Providing battery back-up of clock function on control card
As general extension of analog I/O selection available on control card, e.g. for multi-zone
control with three pressure transmitters
Turning frequency converter into decentral I/O block supporting Building Management
System with inputs for sensors and outputs for operating dampers and valve actuators
Support Extended PID controllers with I/Os for set point inputs, transmitter/sensor in-
puts and
0 - 10 V
0/4-20 mA by mounting a 500 Ω resistor across terminals
Ni1000 temperature sensor of 1000 Ω at 0° C. Specifications according to DIN43760
Pt1000 temperature sensor of 1000 Ω at 0° C. Specifications according to IEC 60751
MG.11.B2.02 - VLT
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is a registered Danfoss trademark
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VLT HVAC Drive Design Guide