Question:
What brake chopper switching thresholds are effective for the i700 and i950 devices?
Answer:
The two device series have different brake chopper switching thresholds:
i700 servo inverter:
For the i700, the brake chopper switching threshold is permanently set to:
ON: 765 V (DC)
For operation on mains systems with lower rated mains voltage, e.g. 230V mains, you have to consider that the DC voltage may rise up to the brake chopper threshold when braking in generator-mode.
i950 servo inverter:
- For the i950, the brake chopper switching threshold is automatically adapted to the selected rated mains voltage:
400V mains: ON: 725 V (DC), OFF: 710 V (DC)
480V mains: ON: 780 V (DC), OFF: 765 V (DC)
230V mains: ON: 390 V (DC), OFF: 380 V (DC)
Background:
With the i700 series, only the i700 power supply modules are equipped with a brake chopper. The i700 axis modules are not equipped with a brake chopper.
The i700 power supply modules are analog devices. Accordingly, the brake choppers are also subject to analog control so that the switching thresholds cannot be changed by means of software.
With the i950, on the other hand, each device is equipped with a brake chopper that is controlled via the firmware. The switching thresholds can thus be adapted by means of software.
All values indicated in this AKB article are for illustration purposes only.
Only the information in the corresponding documentation for the controllers (i700 hardware manual, i950 commissioning manual) is binding.
