INVT Goodrive350-19 Series Operation Manual page 524

Goodrive350-19 Series VFD for Crane
VFD power
Braking unit
200kW
220kW
250kW
280kW
315kW
355kW
400kW
450kW
500kW
Note:

Select braking resistors according to the resistance and power data provided by INVT. Users can
choose different resistance values and powers according to their actual situation, but the
resistance value must not be less than the minimum allowable braking resistance value in the
table, otherwise the braking unit may be burned out. The selection of braking resistor needs to be
determined based on the power generated by the motor in the actual application system, which is
related to the system inertia, deceleration time, and potential energy load energy. The larger the
system inertia, the shorter the deceleration time, and the more frequent the braking, the braking
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.
Braking unit
Rated
continuous
model braking
current (A)
DBU100H-400-4
Two DBU100H-320-4
Two DBU100H-400-4
100%
braking
Max. peak
torque
braking
matching
current (A)
resistance
(Ω)
2.5
2.2
2
3.6*2
3.2*2
2.8*2
2.4*2
2.0*2
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Optional peripheral accessories
Braking resistor
Moving
Lifting oriented
oriented
recommended
recommended
min. power
min. power
(kW)
(kW)
≥100 ≥50
≥110 ≥55
≥125 ≥62
≥70*2 ≥35*2
≥80*2 ≥40*2
≥90*2 ≥45*2
≥100*2 ≥50*2
≥125*2 ≥62*2
Min.
allowed
resistance
(Ω)
1.8
2.2*2
1.8*2