LOGO! installation and wiring

2.3 Wiring LOGO!

LOGO! AM2 RTD

You can connect a maximum of two PT100 sensors or two PT1000 or one PT100 plus one PT1000 sensor in a 2-wire or 3-wire connection or in a mixed use of 2-wire and 3-wire connection to the module. Note that the sensor type supported by the module is only PT100 or PT1000 with the default temperature coefficient of α= 0.003850.

For a 2-wireconnection, you need to short-circuit terminals M1+ and IC1 or M2+ and IC2. Errors caused by the ohmic resistance of the measuring line are not compensated for this type of connection. If a PT100 sensor is connected, a line resistance of 1 Ω is proportional to measuring error of +2.5 °C; if a PT1000 sensor is connected, a line resistance of 1 Ω is proportional to measuring error of +0.25 °C.

A 3-wiretechnique suppresses the influence of the cable length (ohmic resistance) on the result of the measurement.

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Note

Fluctuating analog values are due to screening on the connecting wire from the analog valuator device to the analog AM2 / AM2 PT100 / AM2 RTD LOGO! expansion module (encoder wire) that has either been mounted incorrectly or not at all.

To avoid fluctuating analog values when using these expansion modules, proceed as follows:

•Use only shielded encoder wires.

•Shorten the encoder wire as much a possible. The encoder wire must not be more than 10 meters long.

•Clamp the encoder wire on one side only and clamp it only to the PE terminal on the AM2 / AM2 PT100 / AM2 AQ / AM2 RTD expansion module.

•Connect ground on the encoder supply to the PE terminal on the expansion module.

•Avoid operating the LOGO! AM2 PT100 or LOGO! AM2 RTD expansion module with a power supply that is not grounded (potential-free). If you cannot avoid this, connect the negative output/ground output on the power supply to the shielding on the resistance thermometer's measuring wires.

LOGO!

 

Manual, 04/2011, A5E03556174-01

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Siemens 6ED1050-1AA00-0BE8 manual LOGO! AM2 RTD
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