Connection Of A Brake Resistor - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

6.4.4 Connection of a Brake Resistor

Install 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-link
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. The
temperature switch disconnects the frequency inverter from mains supply if the brake
resistor is overloaded.
Using Brake resistors without temperature switches can result in critical states.
Connection of a brake resistor is done via terminal X2.
Limit the length of the brake resistor cables to the necessary minimum.
06/13
X2
Rb1 Rb2
R
b
Rb1 Rb2
T1 T2
K1
Operating Instructions ACU
L1 L2 L3
K1
X1
59