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
