On a PCD2.M4560 or PCD3.W5560, why the measured PT100 temperature values are not correct if the PT100 sensors are connected to PCD2.W220Z18 or PCD3.W220Z18 modules?

FAQ #102052

If the PCD2/3.W220Z18 card is plugged in to a ‘Power PCD‘ and if all 8 analog inputs channels of the PCD2/3.W220Z18 module are connected to 8 PT100 sensors then the measured PT100 temperature values of the 8 channels are not correct.

 

‘Power PCD’s’ are:

  • PCD1.M2x20, PCD1.M2160, PCD1.M2220-C15
  • PCD2.M5540, PCD2.M5440, PCD2.M4160, PCD2.M4560
  • PCD3.Mxx60

 

To solve the issue, use and connect only up to 7 PT100 sensors to the PCD2/3.W220Z18 or do use a PCD2/3.W350 module, if all 8 PT100 are needed.

On the ‘old’ PCD’s like PCD2.M170 or PCD3.M5540 the PCD internal power supply V+ was at 24V

On the ‘new’ ‘Power-PCD’s’ the V+ is 16,5V

 

The electrical design of the PCD2/3.W220Z18 was done in that the way, that the internal power V+ of 24V was required to handle all 8 PT100 channels.

 

Since the ‘Power PCD’s’ have a V+ of 16,5V the driver on the PCD2/3.W220Z18 don’t have enough power to handle all 8 PT100 signals correctly.

 

To solve the issue, use and connect only up to 7 PT100 sensors to the PCD2/3.W220Z18 or do use a PCD2/3.W350 module, if all 8 PT100 are needed.

Categories

PCD1

PCD2 / Mxxx

PCD3 / Mxxx

PCD3 / Wxxx

PCD1 / M2xx0

PCD2 / M5xxx

PCD2 / M1xx

PCD2 / M48x

PCD2 / M4x60

PCD3 / W6x5

Last update: 04.10.2021 15:50

First release: 04.10.2021 15:50

Views: 2

The requested software / document is no longer marketed by Saia-Burgess Controls AG and without technical support. It is an older software version which can be operated only on certain now no longer commercially available products.

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