Woodward BU1-DC2 User manual

BU1-DC2 – DC Voltage Relay
Manual BU1-DC2 (Revision A)

Woodward Manual BU1-DC2 GB
2 DOK-TD-BU1-DC2E Rev.A

Manual BU1-DC2 GB Woodward
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sumed by Woodward Governor Company unless otherwise expressly undertaken.
© Woodward 1994-2008
DOK-TD-BU1-DC2E Rev.A

Woodward Manual BU1-DC2 GB
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
4 DOK-TD-BU1-DC2E Rev.A

Manual BU1-DC2 GB Woodward
DOK-TD-BU1-DC2E Rev.A
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

Woodward Manual BU1-DC2 GB
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
6 DOK-TD-BU1-DC2E Rev.A

Manual BU1-DC2 GB Woodward
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
DOK-TD-BU1-DC2E Rev.A

Woodward Manual BU1-DC2 GB
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Krefelder Weg 47 ⋅D – 47906 Kempen (Germany)
Postfach 10 07 55 (P.O.Box) ⋅D – 47884 Kempen (Germany)
Phone: [phone]
Internet
www.woodward.com
Sales
Phone: [phone] or 342 ⋅Telefax: [phone]
e-mail: [email protected]
Service
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e-mail: [email protected]
8 DOK-TD-BU1-DC2E Rev.A