3UG3501 datasheet(87/114 Pages) ETC2

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Monitoring Relays

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Siemens LV 1 T · 2006

3RS10, 3RS11 Temperature Monitoring Relays

General data

■Overview

The 3RS10 and 3RS11 temperature monitoring relays can be

used for measuring temperatures in solid, liquid and gas media.

The temperature is sensed by the sensor in the medium,

evaluated by the device and monitored for overshoot or

undershoot or for staying within an operating range (window

function).

The range comprises adjustable analog units with one or two

threshold values, digital units to DIN 3440, which are also a good

alternative to temperature controls for the low-end range, and

digital units for up to 3 sensors which have been optimized for

monitoring large motors.

■Design

The temperature monitoring relays comply with:

• IEC 60721-3-3 "Environmental conditions"

• IEC 60947-5-1; VDE 0660 "Low-voltage controlgear,

switchgear and systems – Electromechanical controlgear"

• EN 61000-6-4 "Basic technical standard for emitted

interference (Industry)"

• EN 61000-6-2 "Basic technical standard for interference

immunity (Industry)"

• EN 50042 "Designations for terminals"

•UL/CSA

• DIN 3440 (3RS10 40, 3RS11 40, 3RS10 42, 3RS11 42).

Connection of resistance-type thermometers

2-wire measurement

When 2-wire temperature sensors are used, the resistances of

the sensor and wiring are added. The resulting systematic error

must be taken into account when the signal evaluator is

calibrated. A jumper must be clamped between terminals T2

and T3 for this purpose.

Wiring errors

The errors that are generated by the wiring comprise

approximately 2.5 K/

W. If the resistance of the wiring is not known

and cannot be measured, the wiring errors can also be

estimated using the following table.

Temperature drift depending on the length and cross-section of

the leads with PT100 sensors and an ambient temperature of

20 °C, in K:

3-wire measurement

To minimize the effects of the line resistances, a three-wire circuit

is often used. Using the additional wire, two measuring circuits

can be formed of which one is used as a reference. The signal

evaluator can then automatically calculate the line resistance

and take it into account.

Temperature

setting

LED "Device on voltage"

LED "Relay switched"

Hysteresis switch

LED for display

"Up and Down" keys

Rotary switch for

parameter selection

NSB0_01421

NSB01323a

PT 100

Cable length

Cross-section

mm²

0.5

0.75

1.5

0.0

1.8

1.2

0.9

0.6

4.5

3.0

2.3

1.5

9.0

6.0

4.5

3.0

13.6

9.0

6.8

4.5

100

18.1

12.1

9.0

6.0

200

36.3

24.2

18.1

12.1

500

91.6

60.8

45.5

30.2

NSB01324a

PT 100

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