Electrical Installation; Checking The Insulation Of The Assembly; Connection Diagram; Connection Procedure - ABB ACS880-07 Hardware Manual

226 Resistor braking

Electrical installation

Checking the insulation of the assembly


Follow the instructions given under

Connection diagram


See section Connection diagram

Connection procedure


•
Connect the resistor cables to the R+ and R- terminals in the same way as the other
power cables. If a shielded three-conductor cable is used, cut the third conductor and
ground the twisted shield of the cable (protective earth conductor of the resistor
assembly) at both ends.
•
Connect the thermal switch of the brake resistor as described in section
system against thermal overload

Start-up

Note: Protective oil on the brake resistors will burn off when the brake resistor is used for
the first time. Make sure that the airflow is sufficient.
Set the following parameters (ACS880 primary control program):
•
Disable the overvoltage control of the drive by parameter 30.30 Overvoltage control.
•
Set parameter 31.01 External event 1 source to point to the digital input where the
thermal switch of the brake resistor is wired.
•
Set parameter 31.02 External event 1 type to Fault.
•
Enable the brake chopper by parameter 43.06 Brake chopper enable. If Enabled
with thermal model is selected, set also the brake resistor overload protection
parameters 43.08 and 43.09 according to the application.
•
Set parameter 43.07 Brake chopper runtime enable to Other [bit] and select from
parameter 10.01 DI status the digital input where the thermal switch of the brake
resistor is wired.
•
Check the resistance value of parameter 43.10 Brake resistance.
•
With these parameter settings, the drive stops by coasting on brake resistor
overtemperature.
WARNING! If the drive is equipped with a brake chopper but the chopper is not
enabled by the parameter setting, the internal thermal protection of the drive
against resistor overheating is not in use. In this case, the brake resistor must be
disconnected.
For settings of other control programs, see the appropriate firmware manual.
Brake resistor assembly
on page 89.
on page 225.
on page 88.
Protecting the