Analog I/O Option Mcb - Danfoss VLT AQUA Design Manual

3. VLT AQUA Selection

3.7.9. 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 decentral I/O block supporting Building Management System with inputs for sensors and outputs for operating
dampers and valve actuators
3
• Support Extended PID controllers with I/Os for set point inputs, transmitter/sensor inputs and outputs for actuators.
Illustration 3.23: 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 510Ω resistor across terminals (see NB!)
• 4-20 mA (voltage input 2-10V) by mounting a 510Ω 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.
NB!
Please note the values available within the different standard groups of resistors:
E12: Closest standard value is 470Ω, creating an input of 449.9Ω and 8.997V.
E24: Closest standard value is 510Ω, creating an input of 486.4Ω and 9.728V.
E48: Closest standard value is 511Ω, creating an input of 487.3Ω and 9.746V.
E96: Closest standard value is 523Ω, creating an input of 498.2Ω and 9.964V.
70
®
MG.20.N3.02 - VLT is a registered Danfoss trademark
®
VLT AQUA Drive Design Guide