Applications

The 520PTD01 circuit board is used for direct connection of PT100 temperature transmitters.

Up to six transmitters can be connected to the board. The measuring range is ± 200 °C.

Special features

Basic checks and calculation-intensive cyclic processing functions are www.abb-drive.com already performed on the module, thus reducing the burden on the communication unit.

Relevant changes are transmitted as events via the WRB I/O bus.

The 6 differential inputs are not isolated from the RTU500 series power supply.

The 520PTD01 converts the analogue signal to 4096 steps (12 bits) and measures 100%.

The differential inputs are protected against static and dynamic overvoltage by protection circuitry. A low-pass filter suppresses non-line frequency AC interference.

Two additional channels are used for automatic zero calibration.

The line frequency is configurable in the configuration tool.

The microcontroller uses these configuration parameters to set up the A/D converter.

The microcontroller controls the A/D converter and performs all processing functions on the configured measurements within a conversion time of 80 ms (50 Hz).

In addition, the microcontroller communicates with the RTU system bus. All configuration features and processing parameters are downloaded from the CMU via the RTU system bus.

The module is connected to the RTU WRB I/O bus (wired OR bus) via adapter 520ADD01.

During initialisation and operation, the module performs a series of tests. If a fault occurs, it will be reported to the CMU.

All fault conditions affecting the functionality of the module are displayed as general fault signals with the red LED “ERR”.

Module faults are detected by the communication unit.