About The Dbw04 - WEG DBW04 Serie Manual Del Usuario

General Information
kg: kilogram = 1000 gram.
kHz: kilohertz = 1000 hertz.
m: meter.
miliampere = 0.001 ampere.
min: minute.
ms: millisecond.
Nm: Newton meter; torque measurement unit.
rms: "Root mean square"; effective value.
rpm: revolutions per minute; speed measurement unit.
s: second.
V: volts.
Ω: ohms.

2.3 ABOUT THE DBW04

The DBW04 dynamic braking module is used in applications with high-inertia loads, requiring
short braking times. It is also used in lifting applications that require speed control of the load.
In these cases, the power flows from the line to the motor while it is motorizing, see Figure 2.1
on page 7.
Frequency inverter
+UD
M J
-UD
Figure 2.1: Motorization step
In the next step, it is necessary to reduce the motor speed. The motor becomes a generator
and the power is returned to the DC link.
In order to avoid overvoltage, the energy is dissipated in a resistor by using the dynamic braking
module, as shown in Figure 2.2 on page 8.
DBW04 | 7