3UG4622-1AW30 Datasheet, PDF (63/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

■ Overview
Monitoring Relays
3UG Monitoring Relays for Electrical and Additional Measurements
Line monitoring
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
L1-L2-L3
11/14
ON _11/12
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
L1-L2-L3 L2-L3 L1-L2-L3
21/24
21/22
Wrong phase sequence
L3-L2-L1
11/14
OFF ^11/12
21/24
21/22
11/14
11/12
21/24
21/22
LED rd
OFF
ON
Phase loss
OFF
Wrong phase sequence
L3-L2-L1
11/14
11/12
21/24
21/22
LED rd
OFF FLASH OFF
Phase sequence
Siemens LV 1 T · 2006
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