6.8.2
Converter protection using temperature monitoring
Overview
The converter temperature is essentially defined by the following effects:
● The ambient temperature
● The ohmic losses increasing with the output current
● Switching losses increasing with the pulse frequency
Monitoring types
The converter monitors its temperature using the following monitoring types:
● I
2
t monitoring (alarm A07805, fault F30005)
● Measuring the chip temperature of the Power Module (alarm A05006, fault F30024)
● Measuring the heat sink temperature of the Power Module (alarm A05000, fault F30004)
Function description
Overload response for p0290 = 0
The converter responds depending on the control mode that has been set:
● In vector control, the converter reduces the output current.
● In U/f control, the converter reduces the speed.
Once the overload condition has been removed, the converter re-enables the output current or
speed.
If the measure cannot prevent a converter thermal overload, then the converter switches off the
motor with fault F30024.
Overload response for p0290 = 1
The converter immediately switches off the motor with fault F30024.
Overload response for p0290 = 2
We recommend this setting for drives with square-law torque characteristic, e.g. fans.
Advanced commissioning
6.8 Drive protection
SINAMICS G120X converter
406
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
