Thytronic NV10B - Undervoltage Protection Logic Diagrams

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CHARACTERISTICS

NV10B - Manual - 04 - 2022

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 \ Proﬁle A(or B) \ Undervoltage

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

[1]

All the named parameters can be set separately for Proﬁle A and Proﬁle B (Set \ Proﬁle A(or B) \

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

For every of the two thresholds the logic block can be set.

Logical block (Block1)

If the U<BLK1 and/or U<<BLK1 enabling parameters are set to ON and a binary input is designed

for logical block (Block1), the protection is blocked off whenever the given input is active.

The trip timer is held in reset condition, so the operate time counting starts when the input block goes

down.

[2]

The enabling parameters are available inside the Set \ Proﬁle A(or B) \ Undervoltage - 27 \

U< Element (U<< Element) \ Setpoints menus, while the Block1 function must be assigned to the

selected binary input inside the Set \ Inputs \ Binary input IN1(x) menus (IN1 or INx matching).

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

Note 2 The exhaustive treatment of the logical block (Block 1) function may be found in the “Logic Block” paragraph inside CONTROL AND MONITOR-

ING section.

all-F27.ai

U< Element

U<< Element

Start U<<

Start U<

Trip U<

Trip U<<

U< disbyU<<

U< inhibition

def

inv

def

U<<

def

U<<

def

inv

U< Curve U< Enable State

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_S2.ai

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

RESET

U<<

TRIPPING MATRIX

(LED+RELAYS)

U<<def

Start U<<

Trip U<<

BF Enable (ON≡ Enable)

towards BF logic

U<< BF

Enable (ON≡ Enable)

Block1 input (ON≡ Block)

Block1

(ON≡

Inhibit

)

U< Inhibition

U<disbyU<<

Binary input INx (x=1...8-16)

T 0

Logic

INx

OFF

n.o.

n.c.

INx

OFF

U<<ST-K

U<<TR-K

U<<ST-L

U<<TR-L

U<<BF

BLK1U<

U<<BLK1

Logic27

≥1

State

≤

def

U<<

def

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Thytronic NV10B - Undervoltage Protection Logic Diagrams

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