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-
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 select
resistor the temperature swit
ch 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.
L1
L2
L3
K1
K1
R
b
T1
Rb1 Rb2
T2
Rb2Rb1
X2
X1
06/13 Operating Instructions ACU 59
To Next Page
Loading...
Need help?
General
