Page 174 - EPR Catalog 2015

Temperature monitoring relays
Connection diagrams, Resistance thermometer sensors

Connection diagrams Y1 Y2 A1 Y1 Y2 A1

A 1 11 21 Memory K1 15 Memory K1 15

2 T3 T2 T1 T1 1 18 1T1 1 18
T2 2 16 1T2 16
T1 T2 T3 11 21 T3 K2 25 K2 25
1T3
A1 A2 12 14 22 24 28 28
26 2T1 26
24 22 K3 33 2T2 2 K3 33
14 12 A2
CM-TCS 34 2T3 34
A1-A2 Control supply voltage 2CDC 252 025 F0010
11-12/14 Output relay R1 1SVC 110 000 F0201Ready3T1
21-22/24 Output relay R2 1SVC 110 000 F0202A23T2 Ready
T1, T2, T3 Measuring input, connection PT100 3T3

A2

C512 C513

A1-A2 Rated control suppy A1-A2 Rated control suppy
voltage voltage
15-16/18 Output contacts 15-16/18 Output contacts
25-26/28 25-26/28
33-34 Sensor connection 33-34 Sensor connection 1
T1-T3 Connection for 1T1-1T3 Sensor connection 2
Y1-Y2 storage bridge 2T1-2T3 Sensor connection 3
3T1-3T3 Connection for
Y1-Y2 storage bridge

Connection of resistance thermometer sensors

2-wire measurement 3-wire measurement

When using 2-wire temperature sensors the sensor resis- To minimize the influence of the wire resistance, a three-wire

tance and the wire resistance are added together. connection is usually used. By means of the additional wire

The resulting systematic errors must be taken into account two measuring circuits are created. PT100

when adjusting the tripping device. PT100 One of these two circuits is used

A jumper must be connected between for reference. This way, the tripping

the terminals T2 and T3. device can calculate and take into

The following table can be used for T1 T2 T3 account the wire resistance auto- T1 T2 T3
PT100 sensors to determine the
matically.
temperature errors caused by the line

length.

When using resistance sensors with

two-wire connection a bridge must be

inserted between terminals T2 and T3.

Error caused by the line Electrical isolation 11 12 14
The error resulting from the line resistance amounts to ap-
prox. 2.5 Kelvin/Ohm. If the resistance of the line is not 11 12 14
known and it is not possible to measure it, the error caused
by the line can be estimated using the following table.

Temperature error T1 21 T1 21
(depending on the line length and conductor cross section T2 22 T2 22
for PT100 sensors at an ambient temperature of 20 °C, in K) T3 24 T3 24

24 V AC/DC 24-240 V AC/DC
A1 A2 A1 A2
Line length in m Wire size mm2 2CDC 252 019 F0010
2CDC 252 020 F0010
0
10 0.50 0.75 1 1.5
25
50 0.0 0.0 0.0 0.0 Electrical isolation
75 1.8 1.2 0.9 0.6
100 4.5 3.0 2.3 1.5 Protective searation acc. to IEC/EN 61140; EN 50178
200 9.0 6.0 4.5 3.0
500 13.6 9.0 6.8 4.5
18.1 12.1 9.0 6.0
36.3 24.2 18.1 12.1
91.6 60.8 45.5 30.2

2/107 ABB | Catalog Electronic Products and Relays 2015 | 2CDC 110 004 C0210