![background image](http://html.mh-extra.com/html/abb/relion-615-series/relion-615-series_technical-manual_2395123.webp)
Table 53:
Function identification, limits for the RTD/mA inputs
Input
Limit value
RTD temperature, high
> 200 °C
RTD temperature, low
< -40 °C
mA current, high
> 23 mA
Resistance, high
> 2000 Ω
3.13.2.5
Self-supervision
Each input sample is validated before it is fed into the filter algorithm. The samples are
validated by measuring an internally set reference current immediately after the inputs are
sampled. Each RTD sensor type has expected current based on the sensor type. If the
measured offset current deviates from the reference current more than 20%, the sample is
discarded and the output is set to invalid. The invalid measure status deactivates as soon
as the measured input signal is within the measurement offset.
3.13.2.6
Calibration
RTD and mA inputs are calibrated at the factory. The calibration circuitry monitors the
RTD channels continuously and reports a circuitry break of any channel.
3.13.2.7
Limit value supervision
The limit value supervision function indicates whether the measured value of AI_INST#
exceeds or falls below the set limits. All the measuring channels have an individual limit
value supervision function. The measured value contains the corresponding range
information AI_RANGE# and has a value in the range of 0 to 4:
•
0: “normal”
•
1: “high”
•
2: “low”
•
3: “high-high”
•
4: “low-low”
The range information changes and the new values are reported.
1MAC059074-MB A
Section 3
Basic functions
615 series ANSI
117
Technical Manual
Summary of Contents for Relion 615 series
Page 1: ... RELION PROTECTION AND CONTROL 615 series ANSI Technical Manual ...
Page 2: ......
Page 39: ...Section 17 Glossary 1181 Table of contents 615 series ANSI 33 Technical Manual ...
Page 40: ...34 ...
Page 64: ...58 ...
Page 216: ...210 ...
Page 884: ...878 ...
Page 1038: ...1032 ...
Page 1136: ...1130 ...
Page 1172: ...1166 ...
Page 1180: ...1174 ...
Page 1186: ...1180 ...
Page 1192: ...1186 ...
Page 1193: ...1187 ...
Page 1194: ......
Page 1195: ......