3UG3501 datasheet(69/114 Pages) ETC2

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Monitoring Relays

7/69

Siemens LV 1 T · 2006

3UG Monitoring Relays for Electrical and Additional Measurements

Voltage monitoring

■Overview

The relays monitor single-phase AC and DC voltages against the

set threshold for overshoot and undershoot. The products differ

with regard to their power supply (internal or external).

■Function

3UG46 33 monitoring relays

The 3UG46 33 voltage monitoring relay has an internal power

supply and performs overshoot, undershoot or window

monitoring of the voltage depending on how it is parameterized.

The device is equipped with a display and is parameterized

using three buttons.

The operating and measuring range extends from 17 V to 275 V

AC/DC. The threshold values for overshoot or undershoot can be

freely configured within this range. If one of these threshold

values is reached, the output relay responds according to the

set principle of operation as soon as the tripping delay time has

elapsed. This delay time UDel can be set from 0.1 to 20 s like the

ON-delay time onDel.

The hysteresis is adjustable from 0.1 to 150 V. The device can be

operated on the basis of either the open-circuit or closed-circuit

principle and with manual or auto RESET. One output

changeover contact is available as signaling contact.

With the closed-circuit principle selected

Overvoltage

Undervoltage

Window monitoring

11/14

11/12

= 0

A1-A2 =

Hysteresis

Delay

onDelay

11/14

11/12

= 0

A1-A2 =

Hysteresis

Delay

onDelay

A1-A2 =

11/14

11/12

= 0

Hysteresis

Delay

onDelay

Delay =

Delay

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