Brake Chopper And Brake Resistance - BONFIGLIOLI ACTIVE Cube ACU 201-01 Operating Instructions Manual

18.4

Brake Chopper and Brake Resistance

The frequency inverters feature a brake chopper transistor. The external brake resis-
tor is connected to terminals Rb1 and Rb2. The parameter
defines the switch-on threshold of the brake chopper. The generator output of the
drive, which leads to the increase in the DC link voltage, is converted to heat by the
external brake resistor above the limit set via parameter
No.
506 Trigger threshold
The parameter
the maximum DC link voltage which the mains can generate and the maximum ad-
missible DC link voltage of the frequency inverter.
⋅
U 1,1
Netz
If the parameter
DC link voltage, the brake chopper cannot become active; the brake chopper is
switched off.
If the parameter
generated by the mains, error message F0705 (chapter "Error Messages") is dis-
played if the start command is issued to the frequency inverter.
If the DC link voltage exceeds the maximum value of 400 V for the ACU 201 series of
devices or 800 V for the ACU 401 series of devices the error message F0700 is dis-
played (chapter "Error Messages").
The sampling time of the function is 125 µs. The brake chopper remains on for at
least 125 µs after the set trigger threshold was exceeded even if the value drops
below the trigger threshold within this period again.
Trigger Threshold
Operating Instructions ACU
06/13
Parameter
Description
Trigger threshold
⋅ < <
2 Ud Ud
BC max
Trigger threshold
Trigger threshold
U
d
506
Brake chopper
ON
OFF
trigger threshold
Settings
ACU Min.
201 225
1000.0 V
401 425
506 is to be set in such a way that it is between
506 is set larger than the maximum admissible
506 is set to a value below the DC link voltage
t
t
µ
125 s
506
Trigger threshold
506.
Max. Fact. sett..
390
780
243