Table of Contents
Advertisement
The converter responds in 2 stages:
1. If you operate the converter with increased pulse frequency setpoint p1800, then the
converter reduces its pulse frequency starting at p1800.
In spite of the temporarily reduced pulse frequency, the base-load output current remains
unchanged at the value that is assigned to parameter p1800.
Figure 6-81
Once the overload condition has been removed, the converter increases the pulse
frequency back to the pulse frequency setpoint p1800.
2. If it is not possible to temporarily reduce the pulse frequency, or the risk of thermal overload
cannot be prevented, then stage 2 follows:
– In vector control, the converter reduces its 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 both measures cannot prevent a power unit thermal overload, then the converter switches off
the motor with fault F30024.
Overload response for p0290 = 3
If you operate the converter with increased pulse frequency, then the converter reduces its
pulse frequency starting at the pulse frequency setpoint p1800.
In spite of the temporarily reduced pulse frequency, the maximum output current remains
unchanged at the value that is assigned to the pulse frequency setpoint. Also see p0290 = 2.
Once the overload condition has been removed, the converter increases the pulse frequency
back to the pulse frequency setpoint p1800.
If it is not possible to temporarily reduce the pulse frequency, or the measure cannot prevent a
power unit thermal overload, then the converter switches off the motor with fault F30024.
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
Derating characteristic and base load output current for overload
Advanced commissioning
6.8 Drive protection
407
Advertisement
Table of Contents
