Lenze E94AxPExxxx - Manual (Page 156)

5 Drive interface
5.5 Device output power
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Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
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Reduced switching losses through switching frequency reduction
The advantage of a switching frequency reduction are the reduced switching losses in the
controller, which are monitored via an I x t evaluation.
• A reduced switching frequency enables a greater current-time area at the output than it would
be the case with a higher switching frequency. However, depending on the process, you always
have to make a compromise between the torque ripple and the output power.
5.5.2 Monitoring of the device utilisation
In C00064 the device utilisation (I x t) is displayed over the last 180 seconds in [%].
• If the value displayed in C00064 exceeds the warning threshold set in C00123 , the error
message "device utilisation Ixt > C00123" is output and the fault response set in C00604 occurs
(default setting: "Warning").
• If the value displayed in C00064 exceeds 100 %, the error message "device utilisation Ixt
> 100 %" is output and the "Fault" error response occurs.
• The fault can only be reset if the value displayed in C00064 is < 95 % again.