INVT Goodrive 35 Series Operation Manual page 341

inverters
Goodrive35
users need more braking torque, the braking resistor can decrease properly and the power
needs to be magnified.
When using the external braking units, please see the instructions of the energy braking
units to set the voltage degree of the braking unit. Incorrect voltage degree may affect the
normal running of the inverter.
 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.8.3 Selecting the brake resistor cables
Use a shielded cable to the resistor cable.
D.8.4 Placing the brake resistor
Install all resistors in a place with enough ventilation.
 The materials near the brake resistor must be non-flammable. The surface
temperature of the resistor is high. Air flowing from the resistor is of hundreds
of degrees Celsius. Protect the resistor against contact.
Installation of the braking resistor:
 The inverters of 380V (≤30kW) only need external braking resistors.
 PB and (+) are the wiring terminals of the braking resistors.
Installation of braking units:
 The inverters of 380V (≥37kW) need external braking units.
 The inverters of 660V need external braking units.
 (+), (-) are the wiring terminals of the braking units.
 The wiring length between the (+),(-) terminals of the inverter and the (+),(-)
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Appendix D