Sizing The Braking Resistor - WEG CFW900 User Manual

INSTALLATION AND CONNECTION

3.2.4.2.1 Sizing the Braking Resistor

The following application data shall be considered for the adequate sizing of the braking resistor:
Desired deceleration time.
Load inertia.
Braking duty cycle.
In any case, the effective current value and the maximum braking current value presented in
respected.
The maximum braking current defines the minimum braking resistor value in ohms.
The DC Link voltage level for the activation of the dynamic braking function is defined in parameter C3.6.1 (DC link
level).
The power of the braking resistor is a function of the deceleration time, the load inertia, and the load torque.
For most applications, a braking resistor with the value in ohms indicated in
of the rated driven motor power. Use wire type resistors in a ceramic support with adequate insulation voltage
and capable of with standing high instantaneous power with respect to rated power. For critical applications with
very short deceleration times and high inertia loads (ex.: centrifuges) or short duration cycles, consult WEG for the
adequate sizing of the braking resistor.
32 | CFW900
Table 3.8
Table 3.8, with the power of 20%
shall be