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NC2 0 - Manual - 01 - 2015

FUNCTION CHARACTERISTICS

The ﬁ rst threshold trip (U<) may be inhibited by start of the second threshold (U<<) by setting ON

the U< Disabling by U<< start (U<disbyU<<) parameter available inside the Set \ Proﬁ le A(or B) \

Undervoltage-27 \ U<< Element \ Setpoints.

All undervoltage elements can produce the Breaker Failure output if the U< BF and U<< BF pa-

rameters are set to ON.

The parameters are available inside the Set\Proﬁ le A(or B)\Undervoltage - 27 \ U< Element (U<<

Element) \Setpoints menus.

[1]

All the named parameters can be set separately for Proﬁ le A and Proﬁ le B (Set\Proﬁ le A(or B)\Un-

dervoltage - 27 \ U< Element (U<< Element) \Setpoints menus).

Note 1 The common settings concerning the Breaker failure protection are adjustable inside the Breaker Failure - BF menu.

all-F27.ai

MMI

U<< Element

Disable 27 elements

Start U<<

Start U<< Start U<

Trip U<Trip U<<

≥

U< disbyU<<

U< inhibition

U<< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< CurveU< EnableState

Block1

BLK1U<

U<BLK1

Start U<

Block1

BLK1U<<

U<<BLK1

Start U<<

U<BF

Trip U<

U<BF

AND

Common conﬁguration

Logic27

General logic diagram of the undervoltage elements - 27

all-F27.ai

MMI

U<< Element

Disable 27 elements

Start U<<

Start U<< Start U<

Trip U<Trip U<<

≥

U< disbyU<<

U< inhibition

U<< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< CurveU< EnableState

Block1

BLK1U<

U<BLK1

Start U<

Block1

BLK1U<<

U<<BLK1

Start U<<

U<BF

Trip U<

U<BF

AND

Common conﬁguration

Logic27

General logic diagram of the undervoltage elements - 27

Fun-F27_S1.ai

Logic diagram concerning the ﬁrst threshold (U<) of the undervoltage element - 27

U< Inhibition

(ON≡

Inhibit

)

U< Curve

RESET

TRIPPING MATRIX

(LED+RELAYS)

U<def

U<inv

Start U<

U<ST-K

Start U<

U<TR-K

U<ST-L

U<TR-L

Trip U<

BF Enable (ON≡Enable)

U<BF

towards BF logic

BLK1U<

U< BF

Enable (ON≡Enable)

Block1 input (ON≡Block)

U<BLK1

Block1

Logic27

≥1

Binary input INx

Logic

INx

OFF

n.o.

n.c.

INx

OFF

≥1

State

inv

U ≤

def

U ≤

inv

def

State

ON≡Enable U< undervoltage element

U< Enable

27 Inhibition

(ON≡

Inhibit

)by MMI

Fun-F27_S1.ai

Logic diagram concerning the ﬁrst threshold (U<) of the undervoltage element - 27

U< Inhibition

(ON≡

Inhibit

)

U< Curve

RESET

TRIPPING MATRIX

(LED+RELAYS)

U<def

U<inv

Start U<

U<ST-K

Start U<

U<TR-K

U<ST-L

U<TR-L

Trip U<

BF Enable (ON≡Enable)

U<BF

towards BF logic

BLK1U<

U< BF

Enable (ON≡Enable)

Block1 input (ON≡Block)

U<BLK1

Block1

Logic27

≥1

Binary input INx

Logic

INx

OFF

n.o.

n.c.

INx

OFF

≥1

State

inv

U ≤

def

U ≤

inv

def

State

ON≡Enable U< undervoltage element

U< Enable

27 Inhibition

(ON≡

Inhibit

)by MMI

Brand	Thytronic
Model	NC20
Category	Power distribution unit
Language	English

Thytronic NC20 User Manual

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Thytronic NC20 Specifications

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