7PV datasheet(73/114 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

Current monitoring

■Overview

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

set threshold for overshoot and undershoot. They differ with

regard to their measuring ranges and supply voltage types.

■Function

3UG46 21/3UG46 22 monitoring relays

The 3UG46 21/3UG46 22 current monitoring relay is supplied

with an auxiliary voltage of 24 V AC/DC or 24 to 240 V AC/DC

and performs overshoot, undershoot or window monitoring of

the current depending on how it is parameterized. The device is

equipped with a display and is parameterized using three

buttons.

The measuring range extends from 3 to 500 mA or 0.05 to 10 A.

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 IDel has

elapsed. This time and the ON-delay time onDel are adjustable

from 0.1 to 20 s.

The hysteresis is adjustable from 0.1 to 250 mA or 0.01 to 5 A.

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

Current overshoot

Current undershoot

Window monitoring

= 0

11/14

A1-A2

11/12

Hysteresis

Delay

onDelay

= 0

11/14

A1-A2

11/12

Hysteresis

Delay

onDelay

11/14

11/12

= 0

A1-A2

Hysteresis

Delay

Delay =

onDelay

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