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Monitoring Relays

3UG Monitoring Relays for Electrical and Additional Measurements

Power factor monitoring

7/76

Siemens LV 1 T · 2006

■Overview

The 3UG30 14 power factor monitoring device enables the load

monitoring of motors.

■Function

The 3UG30 14 monitoring relay is used for monitoring the load of

motors by measuring the phase angle between voltage and

current, i.e. the power factor. The output relays respond as long

as the power factor lies between the upper and lower thresholds.

These are set separately on the front using two potentiometers.

When the value of the power factor lies outside this range, the

corresponding output relay will drop after a delay time T1, that

can be set on the front, has elapsed. A fixed hysteresis prevents

the output relay from continuously switching on and off when the

measured value is close to the threshold.

The ON-delay T2 can be used to suppress the effects of motor

start-up.

Important

It is important to ensure that the phases are connected in the

correct sequence L1-L2-L3, otherwise the power factor will be

evaluated incorrectly.

Note:

Power factor monitoring relays are connected in series after the

motor contactor to ensure that the delay time for bridging start-

up elapses after switch-on. For this reason, the output relay must

not be connected in series with the supply voltage of the motor

contactor, otherwise it would not be possible to switch on the

load feeder. The minimum current must be at least 0.2 A.

■Technical specifications

1) Short-circuits without any contact welding acc. to DIN VDE 0660,

Part 200.

c o s

T 2

T 1

N S B 0 _ 0 1 1 2 9

m a x

m i n

m a x

m i n

T h r e s h o l d v a l u e

H y s t e r e s i s

T h r e s h o l d v a l u e

O u t p u t r e l a y c o s

> c o s

( t e r m i n a l s 2 1 , 2 2 , 2 4 )

O u t p u t r e l a y c o s

< c o s

( t e r m i n a l s 1 1 , 1 2 , 1 4 )

Type

3UG30/3UG35

Load capacity of the output relay

Rated operational current Ie

max. 8

AC-15/230 V

DC-13/24 V

DC-13/48 V

0.45

DC-13/60 V

0.35

DC-13/110 V

0.2

DC-13/230 V

0.1

Minimum contact load

5/17 V for a fault of 1 ppm

Output relay with DIAZED fuse1)

gl/Gg operational class

Electrical endurance

Operating cycles

1 x 105

Mechanical endurance

Operating cycles

2 x 106

Ambient temperature

During operation

°C

-20 ... + 50

During storage

°C

-30 ... + 70

Connection of conductors

Solid

mm²

2 x (0.5 ... 2.5)

Finely stranded, with end sleeves

mm²

2 x (0.5 ... 1.5)

Degree of protection

Terminals

IP20

Enclosures

IP40

Vibration resistance

acc. to IEC 60068-2-6

Hz/mm 10 ... 150/0.035

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