Ma Input Module (Mim) - ABB RES670 Technical Manual

Section 23
IED hardware
23.2.11
23.2.11.1
23.2.11.2
840

mA input module (MIM)

Introduction
The milli-ampere input module is used to interface transducer signals in the –20 to +20
mA range from for example OLTC position, temperature or pressure transducers. The
module has six independent, galvanically separated channels.
Design
The Milliampere Input Module has six independent analog channels with separated
protection, filtering, reference, A/D-conversion and optical isolation for each input
making them galvanically isolated from each other and from the rest of the module.
For configuration of the input signals, refer to section
SMMI".
The analog inputs measure DC current in the range of +/- 20 mA. The A/D converter
has a digital filter with selectable filter frequency. All inputs are calibrated separately
The filter parameters and the calibration factors are stored in a non-volatile memory on
the module.
If mA inputs should report measurements, dead band MaxReportT should be set to 0 s.
If MaxReportT is set to any value higher than 0 s, all the inputs will have cyclic
reporting completely disregarding the settings EnDeadBandChx and DeadBandChx.
That is, if MaxReportT is set to 1 s, and wants certain channel to report values as dead
band by setting the parameter EnDeadBandChx to ON, that channel will still report
values as cyclic, completely ignoring the EnDeadBandChx parameter.
The calibration circuitry monitors the module temperature and starts an automatical
calibration procedure if the temperature drift is outside the allowed range.
1MRK 511 408-UUS A
"Signal matrix for mA inputs
Phasor measurement unit RES670 2.2 ANSI
Technical manual
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