3UG3501 datasheet(63/114 Pages) ETC2

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Monitoring Relays

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Siemens LV 1 T · 2006

3UG Monitoring Relays for Electrical and Additional Measurements

Line monitoring

■Overview

Solid-state line monitoring relays provide maximum protection

for mobile machines and plants or for unstable networks.

Network and voltage faults can be detected early and rectified

before far greater damage ensues.

Depending on the version, the relays monitor phase sequence,

phase failure with and without N conductor monitoring, phase

unbalance, undervoltage or overvoltage. With the 3UG46 17

or 3UG46 18 relay, a wrong direction of rotation can also be

corrected automatically.

■Function

3UG45 11 monitoring relays

The 3UG45 11 phase sequenced relay monitors the phase

sequence in a three-phase network. No adjustments are

required for operation. The device has an internal power supply

and works using the closed-circuit principle. If the phase

sequence at the terminals L1-L2-L3 is correct, the output relay

picks up after the delay time has elapsed and the LED is lit. If the

phase sequence is wrong, the output relays remain in their rest

position.

Note:

When one phase fails, connected loads (motor windings, lamps,

transformers, coils, etc.) create a feedback voltage at the

terminal of the failed phase due to the network coupling.

Because the 3UG45 11 relays are not resistant to voltage

feedback, such a phase failure is not detected. Should this be

required, then the 3UG45 12 monitoring relay must be used.

Correct phase sequence

Wrong phase sequence

3UG45 12 monitoring relays

The 3UG45 12 line monitoring relay monitors three-phase

networks with regard to phase sequence, phase failure and

phase unbalance of 10 %. Thanks to a special measuring

method, a phase failure is reliably detected in spite of the wide

voltage range from 160 to 690 V AC and feedback through the

load of up to 90 %. The device has an internal power supply and

works using the closed-circuit principle. No adjustments are

required. When the mains supply is switched on, the green LED

is lit. If the phase sequence at the terminals L1-L2-L3 is correct,

the output relay picks up. If the phase sequence is wrong, the

red LED flashes and the output relay remains in its rest position.

If a phase fails, the red LED is permanently lit and the output

relay drops.

Note:

The red LED is a fault diagnostic indicator and does not show the

current relay status. The 3UG45 12 monitoring relay is suitable

for line frequencies of 50/60 Hz.

Phase failure

Wrong phase sequence

11/14

L1-L2-L3

11/12

21/24

21/22

11/14

L3-L2-L1

11/12

21/24

21/22

OFF

11/14

L1-L2-L3

L2-L3

L1-L2-L3

11/12

21/24

21/22

LED rd

OFF

Phase loss

11/14

11/12

L3-L2-L1

21/24

21/22

LED rd

FLASH

Phase sequence

OFF

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