ABB AC500 V3 Hardware Manual page 684

Device specifications
Communication interface modules (S500) > EtherCAT
The module provide several diagnosis functions
The measuring ranges are described in the section Measuring Ranges
"Parameterization" on page 694
The function of the LEDs is described in the section State LEDs
nosis" on page 700.
Connection of resistance thermometers in 2-wire configuration
When resistance thermometers (Pt100, Pt1000, Ni1000) are used, a constant current must
flow through them to build the necessary voltage drop for the evaluation. For this, the module
CI511-ETHCAT provides a constant current source which is multiplexed over the max. 4 analog
input channels.
The following figure shows the connection of resistance thermometers in 2-wire configuration.
Fig. 123: Connection of resistance thermometers in 2-wire configuration
1 Pt100 (2-wire), Pt1000 (2-wire), Ni1000 (2-wire); 1 analog sensor requires 1 channel
684
NOTICE!
Risk of faulty measurements!
The negative pole/ground potential at the sensors must not have too large a
potential difference with respect to ZP (max. ± 1 V within the full signal range).
Make sure that the potential difference never exceeds ± 1 V.
CAUTION!
The process supply voltage must be included within the grounding concept of
the plant (e. g. grounding of the negative pole).
Ä Chapter 1.7.3.1.10 "Measuring ranges" on page 703.
1
3ADR010278, 3, en_US
Ä Chapter 1.7.3.1.8 "Diagnosis" on page 700.
Ä Chapter 1.7.3.1.8 "Diag-
AI0+
AI1+
UP
ZP
Ä Chapter 1.7.3.1.7
1.0
1.1
1.5
AI–
PTC
1.8
UP
1.9
ZP
2022/01/31