7PV datasheet(89/114 Pages) ETC2

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Monitoring Relays

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Siemens LV 1 T · 2006

3RS10, 3RS11 Temperature Monitoring Relays

General data

Window monitoring (digital units only)

Once the temperature has reached the upper threshold

J1, the

output relay K1 changes its output state as soon as the set time t

has elapsed. The relay returns to its original state as soon as the

temperature reaches the set hysteresis value.

K2 responds in the same manner to the lower threshold of

J2.

Closed-circuit principle

Principle of operation with memory function (3RS10 42,

3RS11 42), based on the example of temperature

undershoot using the closed-circuit principle

Once the temperature has reached the set threshold

J1, the

output relay K1 changes its output state as soon as the set time

t has elapsed (K2 responds in the same manner to

J2). The

relays only return to the original state when the temperature falls

below the set hysteresis value and when terminals Y3 and Y4

have been briefly jumpered.

■Characteristic curves

For thermocouples

For resistance sensors

NSB01331c

N S B 0 _ 0 1 3 3 2 d

U s

Y 3 - Y 4

K 1

K 2

200

400

600

800

1000

1200

1400 1600

Temperature in °C

Type "E"

Type "J"

Type "K"

Type "N"

Type "T"

-100

100

200

300

400

500

5000

4000

3000

2000

1000

NTC

KTY83

KTY84

PT1000

PT100

Temperature in °C

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