Brake Chopper; Safety And Protections; Fixed/Standard Protections; Emergency Stop - ABB ACS560 Firmware Manual



Brake chopper

A brake chopper can be used to handle the energy generated by a decelerating
motor. When the DC voltage rises high enough, the chopper connects the DC circuit
to an external brake resistor. The chopper operation is based on hysteresis.
The internal brake choppers in the drive (in frames R0...R3) start conducting at
internal brake chopper start limit 780 V and stop conducting at internal brake chopper
stop limit 760 V (AC supply 380...480 V).
For information on external brake choppers, refer to the respective user manual.
Note: Overvoltage control needs to be disabled for the chopper to operate.
Settings
Parameter 01.11 DC voltage
parameter group 43 Brake chopper

Safety and protections



Fixed/Standard protections

Overcurrent
If the output current exceeds the internal overcurrent limit, the IGBTs are shut down
immediately to protect the drive.
DC overvoltage
See section Overvoltage control
DC undervoltage
See section Undervoltage control (power loss ride-through)
Drive temperature
If the temperature rises high enough, the drive first starts to limit the switching
frequency and then the current to protect itself. If it is still keeps heating up, for
example because of a fan failure, an overtemperature fault is generated.
Short circuit
In case of a short circuit, the IGBTs are shut down immediately to protect the drive.


Emergency stop

The emergency stop signal is connected to the input selected by parameter
Emergency stop source. An emergency stop can also be generated through fieldbus
(parameter 06.01 Main control
(page 165), 30.30 Overvoltage control
(page 312).
on page 77.
word, bits 0...2).
Program features 81
(page 256) and
on page 77.
21.05