Dynamic Braking - WEG CFW300 Manual Del Usuario

3.2.3.3 Dynamic Braking

NOTE!
The dynamic braking is available from frame size B.
Refer to Table B1 on page 113
current, resistance, effective current (*) and cable gauge.
Input power
supply
(*) The effective braking current can be calculated as follows:
t
(min)
I = I .
br
√
effective max
5
Seeing that: t corresponds to the sum of the braking actuation times during the most severe
br
cycle of five minutes.
The power of the brake resistor must be calculated considering the deceleration time, the inertia
of the load and of the resistive torque.
Procedure to use the dynamic braking:
Connect the brake resistor between the power terminals +BR and BR.
„
Use a twisted cable for the connection. Separate these cables from the signal and control
„
wiring.
Dimension the cables according to the application, observing the maximum and effective
„
currents.
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
R
S
T
+BR BR
Brake
resistor
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