Siemens EF6 Series Bedienungsanleitung PDF herunterladen (Seite 6)

Configuration of a 3-phase

monitoring function

Phase

failure

Phase

imbalance,

voltage

Direction

of rotation

contactor

3UG4

monitoring

relay

3UG Monitoring Relays

for line, single-phase voltage

and insulation monitoring

The new 3UG4 monitoring relays provide a

maximum degree of protection for machines,

plants and systems. This means that line and

voltage faults are detected early and the

appropriate response is initiated before

significant damage can occur.

Measured quantity Possible plant or system fault

Phase sequence • Direction of rotation of the drive

Phase failure • A fuse has blown

• Control supply voltage has failed

• Single-phase operation of a motor with corresponding overheating

Phase dissymmetry • Motor overheating as a result of non-symmetrical voltages

or phase failure

• Line supplies with non-symmetrical load are detected

• A phase failure is detected in spite of regenerative feedback

Undervoltage • Motor draws an increased current and in turn overheats

• A device is undesirably reset

• Detection of line supply dips, especially when supplied from a battery

• Threshold value switch for analog signals 0 to 10 V

Overvoltage • A plant is protected against destruction due to

supply overvoltages

• A plant or system switches-in above a certain voltage

• Threshold value switch for analog signals 0 to 10 V

Insulation monitoring • The insulation resistance for non-grounded plants and systems is monitored

Your advantages:

• Due to the wide voltage range it can be used on all line

supplies around the world – from 160 V to 690 V – without

an auxiliary voltage

• Can be set to overrange, underrange and window

monitoring

• Freely parameterizable delay times and reset functions

• Reduced width for all versions for line and voltage monitoring

• For the digital versions, the actual value and fault type are

displayed

• Automatic rotation direction correction by differentiating

between line faults and incorrect phase sequence

• All versions have removable terminals

• All versions have either screw terminals or alternatively

innovative spring-loaded terminals

Applications:

The applications are listed in the following table. These tables

indicate the various equipment/system conditions that can be de-

tected

using the monitoring parameters.

1 2 3 4 5 6 7 8 9 10 11 ... 31 32

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