Dynamic Braking - WEG CFW300 Manual Del Usuario

3.2.3.3 Dynamic Braking

NOTE!
The dynamic braking is available on DB models from frame size B onwards.
Refer to Table B1 on page 128
current, miminum braking resistance, rms current
(*) The rms braking current can be calculated as follows:
t
(min)
I = I .
br
effective max √
5
Where:
t corresponds to the sum of the braking actuation times during the most severe cycle of five
br
minutes.
The power of the brake resistor must be calculated considering the deceleration time, the inertia
of the load and of the resistive torque.
Input power
supply
for the following specifications of the dynamic braking: maximum
Contactor
Relay
Command
power supply
Thermostat
Figure 3.2: Installation of brake resistor
Installation and Connection
and cable gauge.
(*)
R
S
T
+BR BR
Brake
resistor
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