INVT Goodrive350-19 Series Operation Manual page 526

Goodrive350-19 Series VFD for Crane
resistor with larger power and smaller resistance value needs to be selected.

When the grid voltage is different, users can adjust the dynamic braking threshold voltage. If the
threshold voltage needs to be raised, the corresponding braking resistance needs to be
increased.

The recommended minimum power of the braking resistor mentioned above refers to the rated
power that the resistor can operate for a long time under natural cold conditions. If there is a
cooling fan on site, the power of the braking resistor can be slightly reduced.

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 application to the crane industry, the resistance is recommended to be less than the 100%
torque matching resistance but greater than the min. allowed braking resistance.
Do not use braking resistors whose resistance is lower than the specified minimum
resistance. The VFD does not provide protection against overcurrent caused by
resistors with low resistance.
D.9.2 Braking resistor cable selection
Braking resistor cables should be shielded cables.
D.9.3 Braking resistor installation
All resistors must be installed in places with good cooling conditions.
The materials near the braking resistor or braking unit must be flame resistant. since
the surface temperature of the resistor is high and air flowing from the resistor is of
hundreds of degrees Celsius. Prevent any materials from coming into contact with the
resistor.
Braking resistor installation
 The 380V 110kW and lower VFD models need only external braking resistors.
 PB and (+) are the terminals for connecting braking resistors.
Braking unit installation
VFD
External
braking
resistor
PB
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Optional peripheral accessories