BONFIGLIOLI ACTIVE Cube ACU 401-15 User 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 Trigger threshold 506
defines the switch-on threshold of the brake chopper. The generator out
put 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 trigger threshold 506.
Parameter
Settings
No. Description ACU Min. Max. Fact. sett..
506 Trigger threshold
201
225
1000.0 V
390
401
425
780
The parameter Trigger threshold 506 is to be set in such a way that it is between
the maximum DC link voltage which the mains can generate and the maximum ad-
missible DC link voltage of the frequency inverter.
maxBCNetz
Ud
Ud21,1U <<⋅⋅
If the parameter Trigger threshold 506 is set larger than the maximum admissible
DC link voltage, the brake chopper cannot become active;
the brake chopper is
switched off.
If the parameter Trigger threshold 506 is set to a value below the DC link voltage
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.
Brake chopper
ON
OFF
125 sµ
t
U
d
Trigger Threshold
506
t
06/13 Operating Instructions ACU 243

BONFIGLIOLI ACTIVE Cube ACU 401-15 Specifications

General

Brand	BONFIGLIOLI
Model	ACTIVE Cube ACU 401-15
Category	Inverter
Language	English