Electrical Installation
5.6.5 Brake resistor
Installing a brake resistor if feedback of generator energy is expected. Overvoltage shutdowns can be
avoided by this.
DANGER
Disconnect the frequency inverter from mains voltage and protect it against being ener-
gized unintentionally.
Verify that the frequency inverter is discharged.
Wait for some minutes until the DC link capacitors have discharged before starting to
work at the unit.
When the frequency inverter is disconnected from power supply, the mains, DC-
voltage and motor terminals may still be live for some time.
WARNING
During operation, the surface of the brake resistor can reach high temperatures. The
surface can keep high temperatures after operation
for a certain time. Do not touch the
brake resistor during operation or operational readiness of the frequency inverter. Non-
compliance may result in skin burn.
Install a safeguard for protection against contact or fix warning labels.
Do not install the brake resistor in the proximity to flammable or heat-sensitive materi-
als.
Do not cover the brake resistor.
CAUTION
Bonfiglioli Vectron recommends using a temperature switch. Depending on the selected
resistor the temperature switch is integrated as a standard or optional available. A de-
tailed list is included in Chapter
12.3 “Brake resistor”. The temperature switch discon-
nects the frequency inverter from mains supply if the brake resistor is overloaded.
Using Brake resistors without temperature switches can result in critical states.
41
Motor Connection 06/2013 Operating Instructions
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