Connect the thermal switch of the brake resistor as described in Protecting the system
against thermal overload (page 341).
￭ Start-up
Start-up
Note: New brake resistors may be coated with storage grease. As the brake chopper
operates for the first time, the grease burns off and may produce some smoke. Make
sure there is sufficient ventilation.
Set the following parameters (HVAC 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.
•
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.
Resistor braking, frames R4…R9
￭ Planning the braking system
Frames R4…R9 need external brake choppers and resistors. The table below lists
suitable choppers and resistors.
For more information, see NBRA-6xx Braking Choppers Installation and start-up guide
(3AFY58920541 [English]) and ACS-BRK Brake Units Installation and start-up guide
(3AFY61514309 [English]).
IEC
Reference resistor types
1)
P
BRmax
R
max
R
min
Brake chop-
per
ACH580-01-
kWohmohm
3-phase U
n
= 230 V
Resistor braking 343
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