13
Technical data and dimension sheets
Braking resistor
Operating Instructions – Compact Extra-Low Voltage Drives
97
13.2
Braking resistor
13.2.1
Brake chopper
The task of the brake chopper is to dissipate any unneeded energy in the event of
rapid changes in speed. If the set voltage threshold is exceeded, the external resistor
is switched on.
Chopper current
Recommended braking resistance R
min
Maximum 7.5 A
DC 48 V systems: ≥ 7.5 Ω
INFORMATION
• The braking resistor is not included in the delivery.
• The braking resistor is tested and designed according to the drive application.
(Observe maximum power loss!)
13.2.2
Optional braking resistor
If the application requires the use of a braking resistor, we recommend a resistor with
the following specifications:
• Short-circuit proof, wire-wound flat resistor
•
Degree of protection: IP 54
• Anodized aluminum housing
• Direct mounting on a suitable cooling surface possible
•
Design with 0.3 m long litz wires
Technical data
Type designation
BW009-0005
Part number
17994616
Power type
50 W continuous power
Resistance nominal value
8.8 Ω ± 10%
Ambient temperature
Maximum 40 °C
32370276747
26718014/EN – 11/2020