3.1.9 Analog I/O option MCB 109
The Analog I/O card is supposed to be used in e.g. the following cases:
•
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 de-central 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 inputs and outputs for actuators.
Illustration 3.4: Principle diagram for Analog I/O mounted in frequency converter.
Analog I/O configuration
3 x Analog Inputs, capable of handling following:
•
0 - 10 VDC
OR
•
0-20 mA (voltage input 0-10V) by mounting a 510
Ω
resistor across terminals (see NB!)
•
4-20 mA (voltage input 2-10V) by mounting a 510
Ω
resistor across terminals (see NB)
•
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
3 x Analog Outputs supplying 0-10 VDC.
VLT
®
HVAC Drive Design Guide
3 VLT HVAC Drive Selection
MG.11.B9.02 - VLT
®
is a registered Danfoss trademark
57
3