Goodrive350-19 series VFD Optional peripheral accessories
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DEC time, and more frequent braking require braking resistors with higher power and smaller
resistance.
When grid voltages are different, you can adjust energy consumption braking threshold voltage.
For example, if the threshold voltage needs to be increased, you need to increase the braking
resistance.
The recommended min. power of a braking resistor indicates the rated power of the resistor that
can run in a long period of time in nature cooling condition. If air cooling fans are used, the
braking resistance can be decreased slightly.
When using an external braking unit, set the brake voltage class of the braking unit properly by
referring to the manual of the dynamic braking unit. If the voltage class is set incorrectly, the VFD
may not run properly.
In hoisting applications, the resistor resistance needs to be less than the braking resistance
applicant to 100% torque but greater than the min. allowable resistance.
Do not use braking resistors whose resistance is lower than the specified
minimum resistance for specific VFDs. VFDs do not provide protection
against overcurrent caused by resistors with low resistance.
D.9.2
Braking resistor cable selection
Braking resistor cables need to be shielded cables.
D.9.3 Braking resistor installation
All resistors need to be installed in places with good cooling conditions.
The materials near the braking resistor or braking unit must be
non-flammable. The surface temperature of the resistor is high. Air flowing
from the resistor is of hundreds of degrees Celsius. Prevent any materials
from coming into contact with the resistor.
Installation of braking resistors
The 380V 110 kW and lower VFD models need only external braking resistors.
PB and (+) are the terminals for connecting braking resistors.