Rockwell Automation AK DBU - Dynamic Braking Unit 600/690 VAC - Manual (Page 27)

Appendix
A
Specifications
This appendix provides electrical, environmental, functional and
physical specifications for the DBU and the diagnostic card BUB.
For information on…
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DBU A-1 Brake Resistor Specifications A-4
Dimensions A-3 Fuse Ratings A-4
Diagnostic Card BUB A-4
DBU
Specifications
Power Ratings
Input Voltage
600V 690V
Peak Braking Power 268 kW 305 kW
Minimum Brake Resistor Value permitted
for Peak Braking Power
3.2 ohm 3.7 ohm
Max. Peak Braking Current with 150sec ON
time at up to 25% duty cycle
300 Amp
Maximum Mean RMS Braking Current 150 Amp
Heat Dissipation (Average) at 25% duty cycle 170 W
Power consumption of the control circuits 27mA
Maximum DC bus Voltage
at terminals DC+,DC-
DC 1150V
Pulse width modulation PWM,
switching frequency
0.67 kHz
Capacitance of the built-in snubber 4 µF
Control Output Specifications
Heat sink temperature sensor
The temperature sensor trips if heat sink
temperature exceeds maximum
temperature.
NC contact output rating (max.) Resistive Rating: 15A at 125V AC,
10A at 250V AC,
7A at 24V DC
Inductive Rating: 10A at 125V AC,
6A at 250V AC