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

1MRS758755 A
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REC615 and RER615
Technical Manual
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Figure 32: 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. The default value for all inputs is "Not in use", which means that the channel
is not sampled at all, and the output value quality is set accordingly.
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Section 3
Basic functions
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