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DC VOLTAGE RELAY

Revision: B

Original document

English

MANUAL

BU1-DC

PROTECTION TECHNOLOGY

MADE SIMPLE

DC VOLTAGE RELAY

Basic Line

SEG Electronics GmbH Manual BU1-DC2 GB

2 DOK-TD-BU1-DC2E Rev. B

SEG Electronics GmbH reserves the right to update any portion of this publication at any time.

Information provided by SEG Electronics GmbH is believed to be correct and reliable.

However, no responsibility is assumed by SEG Electronics GmbH unless otherwise expressly undertaken.

© SEG Electronics GmbH 1994–2020

Manual BU1-DC2 GB SEG Electronics GmbH

DOK-TD-BU1-DC2E Rev. B

Application

Supervision of DC voltages

Function

Unit BU1-DC2 is equipped with an over- (U>) and undervoltage supervision (U<) with separate ad-

justable pick-up values and common trip delay (t) and hysteresis (DIFF).

The DC voltage measured is constantly compared with the set reference values. Any voltage sig-

nal, which exceeds the set reference value for overvoltage, or falls below the set reference value

for undervoltage, will cause the respective relay to trip after elaps of the time delay.

Pick-up of the supervision circuit, either U> or U<, is displayed by the corresponding flashing LED.

At undervoltage tripping LED U< extinguishes. At U>-tripping LED U> is steady lit.

Technical data

rated voltage Un: 12 V or 24 V

Power consumption: 3 W

dropout to pickup ratio: dependent on the set hysteresis

dropout time: 300 ms

Minimum operating delay: 300 ms

Output relay

max. breaking capacity: ohmic 250 V AC/120 V DC

inductive 500 V AC/ 75 W DC

rated current: 5 A

making current: 20 A

System Data

regulations: VDE 0435 part 303

temperature range at

storage and operation: -25°C to 70°C

Mechanical stress:

shock: class 1 acc. to DIN IEC 255-21-2

vibration: class 1 acc. to DIN IEC 255-21-1

degree of protection

unit front: IP 40 at closed front cover

weight: approx. 0.3 kg

mounting position: any

SEG Electronics GmbH Manual BU1-DC2 GB

4 DOK-TD-BU1-DC2E Rev. B

Figure 1: Front plate

Unit BU1-DC2 is designed to be fastened onto a DIN-rail acc. to DIN EN 50022, same as all units

of the BASIC LINE.

The front plate of the unit is protected with a sealable transparent cover (IP40).

Please remove the transparent cover at the appropriate openings with a screw driver to adjust the

relay.

LEDs

LED U< is used to indicate trouble free operation with steady light. LEDs U> and U< indicate

pickup of the re-lay by flashing.

At undervoltage tripping LED U< extinguishes.

LED U> indicates tripping at overvoltage (steady light).

Figure 2: Dimensional drawing BU1-DC2

Manual BU1-DC2 GB SEG Electronics GmbH

DOK-TD-BU1-DC2E Rev. B

Auxiliary voltage supply

Unit BU1-DC2 needs no separate auxiliary voltage supply. The supply voltage can be formed di-

rectly from the measuring quantity.

Figure 3: Connection diagram

Figure 4: Contact positions

SEG Electronics GmbH Manual BU1-DC2 GB

6 DOK-TD-BU1-DC2E Rev. B

Connecting terminals

The connection up to a maximum of 2 x 2.5 s mm2cross-section conductors is possible. For this

procedure the transparent cover of the unit has to be removed.

Setting ranges

U<: 0.7 - 1.1 Un

U>: 1.0 - 1.4 Un

t: 0 - 100 s

DIFF: 2 - 10 %

Order form

DC voltage relay

BU1DC2

Rated voltage 12 V/DC

24 V/DC

12

24

www.SEGelectronics.de

SEG Electronics GmbH reserves the right to update any portion of this publication at any time.

Information provided by SEG Electronics GmbH is believed to be correct and reliable. However, SEG

Electronics GmbH assumes no responsibility unless otherwise expressly undertaken.

SEG Electronics GmbH

Krefelder Weg 47 ∙ D–47906 Kempen (Germany)

Postfach 10 07 55 (P.O.Box) ∙ D–47884 Kempen (Germany)

Telephone: +49 (0) 21 52 145 1

Internet: — www.SEGelectronics.de

Sales

Telephone: +49 (0) 21 52 145 331

Fax: +49 (0) 21 52 145 354

E-mail: info@SEGelectronics.de

Service

Telephone: +49 (0) 21 52 145 614

Fax: +49 (0) 21 52 145 354

E-mail: info@SEGelectronics.de

SEG Electronics has company-owned plants, subsidiaries, and branches, as well

as authorized distributors and other authorized service and sales facilities

throughout the world.

Complete address / phone / fax / email information for all locations is

available on our website.

MANUAL │ BU1-DCBU1-DC

Basic Line