ABB RELION 670 Series Technical Manual page 1321

1MRK 502 066-UUS B
22.2.11 mA input module (MIM)
22.2.11.1 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.
22.2.11.2 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
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.
The MIM module can report measured values in two ways:
• Cyclic reporting
• Dead Band reporting
The parameter
MaxReportT is set to a value higher than 0 s, all the channels follow cyclic reporting disregarding
the settings
Deadband reporting requires that
DeadBandChx parameter defines the dead band range for channel x.
Table Parameter dependency
1030:
Reporting
Cyclic
Cyclic
Deadband
The calibration circuitry monitors the module temperature and starts an automatical calibration
procedure if the temperature drift is outside the allowed range.
Technical manual
MaxReportT defines the maximum time between two reports at cyclic reporting. If
EnDeadBandChx and DeadBandChx .
MaxReportT is set to 0, and EnDeadBandChx is set to On. The
MaxReportT
>0
>0
0
"Signal matrix for mA inputs
EnDeadBandChx
Off
On
On
Section 22
IED hardware
IP14537-1 v1
M15020-3 v4
SEMOD55434-1 v1
M6380-3 v6
SMMI".
DeadBandChx
yy
yy
yy
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