Rtd/Ma Inputs; Functionality; Operation Principle; Selection Of Input Signal Type - ABB 615 series Technical Manual

Section 3
Basic functions
3.13
3.13.1
3.13.2
3.13.2.1
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GUID-C5B5FD1C-617B-4F38-A0D4-D98735E69530 V1 EN
Figure 29: Signal output in BIO0006

RTD/mA inputs

Functionality

The RTD and mA analog input module is used for monitoring and metering current (mA),
temperature (°C) and resistance (Ω). Each input can be linearly scaled for various
applications, for example, transformer's tap changer position indication. Each input has
independent limit value supervision and deadband supervision functions, including
warning and alarm signals.

Operation principle

All the inputs of the module are independent RTD and mA channels with individual
protection, reference and optical isolation for each input, making them galvanically
isolated from each other and from the rest of the module. However, the RTD inputs share
a common ground.

Selection of input signal type

The function module inputs accept current or resistance type signals. The inputs are
configured for a particular type of input type by the channel-specific Input mode setting.
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1MAC059074-MB A
615 series ANSI
Technical Manual