Selecting The Brake Resistor Cables; Placing The Brake Resistor - INVT Goodrive 300 Operation Manual

inverters
Goodrive300
The braking resistor may increase the braking torque of the inverter. The resistor power in
the above table is designed on 100% braking torque and 10% braking usage ratio. If the
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.8.2 Selecting the brake resistor cables
Use a shielded cable to the resistor cable.
D.8.3 Placing the brake resistor
Install all resistors in a place where they will cool.
 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 below30kW (including 30kW) only needs external braking
resistors.
 PB and(+)are the wiring terminals of the braking resistors.
Installation of braking units:
 The inverters above 37kW (including 370kW) only needs external
braking units.
 (+),(-) are the wiring terminals of the braking units.
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Appendix D