Siemens 505-2557 Manual De Usuario

Installation

RTD input signals are accepted through a 64 position fixed connector with
wire press in terminals located on the front of the module.  Consult the RTD
manufacturer’s recommendations for selecting the input wire type and size.
The connector will accept 18 to 30 AWG wire.

The SIMATIC 505–2557 uses a fixed connector to terminate field wiring.
This is used because the chemistry of a removable connector may have an
adverse effect on the accuracy of the measurement. Siemens has carefully
selected a connector that minimizes this effect.

Refer to Figure 2-5 for correct wiring for 2, 3, or 4 wire RTDs to the
SIMATIC 505–2557. Each channel consists of four press in terminals. Insert
wire by using a small screw driver to depress the spring tension lever and
then insert the wire. Solid core wires may be pushed in without depressing
lever.

Remove wire by depressing spring lever to remove tension and then remove
lead wire. (See Figure 2-4)

The SIMATIC 505–2557 may compensate for up to 20 Ohm of lead
resistance per wire. Use the table in Figure 2-1 in planning the maximum
distance the RTD may be located from the module.