Danfoss VLT Series Design Manual page 80

3. VLT HVAC Selection
3.6.9. Analog I/O option MCB 109
The Analog I/O card should be used for the following:
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3
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3.13: Principle diagram for analog I/O mounted in the adjustable frequency drive.
Analog I/O configuration
3 x analog inputs, capable of handling following:
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OR
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3 x analog outputs supplying 0-10 VDC.
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Providing battery back-up of clock function on control card
As a general extension of analog I/O selection available on a control card, such as for
multi-zone control with three pressure transmitters.
Turning the adjustable frequency drive into a decentral I/O block supporting the Building
Management System with inputs for sensors and outputs for operating dampers and
valve switches.
Support Extended PID controllers with I/Os for setpoint inputs, transmitter/sensor in-
puts and outputs for switches.
0-10 VDC
0-20 mA (voltage input 0-10 V) by mounting a 510Ω resistor across terminals (see NB!)
4-20 mA (voltage input 2-10 V) by mounting a 510Ω resistor across terminals (see NB!)
Ni1000 temperature sensor of 1000 Ω at 32° F [0° C]. Specifications according to
DIN43760
Pt1000 temperature sensor of 1000 Ω at 32° F [0° C]. Specifications according to IEC
60751
MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
VLT ® HVAC Drive Design Guide