There are 2 functions for overspeed protection (pn26 / pn27 and pn70…pn72).
• An application-specific speed limit can be set with pn26.
• It is calculated from the value of the EMF at which speed the regenerative
voltage of the synchronous machine reaches a value which damage the
capacitors in the inverter DC link. The safety difference to this limit is pre-
set with pn70 overspeed factor (EMF). A value of 90% for pn70 means,
the error is triggered at 90% of the max. theoretically permissible speed
value. The level when the error is triggered is displayed in pn72 overspeed
level (EMF).
The response to the error is defined with pn71 E. overspeed (EMF) st.
mode.
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