Goodrive300 Series VFD Peripherial options and parts
280
3. When using an external brake unit, set the brake voltage class of the brake unit properly by
referring to the manual of the dynamic brake unit. If the voltage class is set incorrectly, the VFD may
not run properly.
• Never use a brake resistor with a resistance below the minimum value
specified for the particular drive. The drive and the internal chopper are not
able to handle the overcurrent caused by the low resistance.
• Increase the power of the braking resistor properly in the frequent braking
situation (the frequency usage ratio is more than 10%).
D.8.1.3 AC 3PH 380V(-15%)–440V(+10%)
The VFDs of 660V need external braking units. Please select the braking resistor according to actual
operation (such as the brake torque and brake usage requirements).
Brake
resistor
value
matched
with 100%
brake
torque (Ω)
Dissipation
power of
brake
resistor (kW)
(10% brake)
Dissipated
power of
brake
resistor
(kW)
(50%
brake)
Dissipated
power of
brake
resistor
(kW)
(80%
brake)
Min
allowed
brake
resistor
(Ω)