Siemens SINAMICS S150 NEMA, Operating Instructions Manual

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Functions, monitoring and protective functions
9.5 Monitoring functions and protective functions
Enclosed Drives
698
Operating Instructions, 12/2018, A5E36652151A
● Reducing the pulse frequency (p0290 = 3, 13)
This procedure is suitable for the following applications:
–
The drive is frequently started and accelerated.
– The drive has a heavily fluctuating torque profile. Reducing the output current is not
desired.
– The drive is operated at a low dynamic response and occasional overload. A rotational
speed deviation is not allowed.
For the set value "3" the following applies:
When a temperature alarm threshold is exceeded, the pulse frequency is reduced to a
permissible minimum.
For the set value "13" the following applies:
In this case, the chip temperature is evaluated based on the load at the current time.
If this temperature exceeds the alarm threshold, the pulse frequency is reduced to a
permissible minimum. Unlike the set value "3", the pulse frequency is reduced based on
the chip temperature evaluation before the temperature alarm threshold has even been
reached.
● Reducing the pulse frequency and the output current (p0290 = 2, 12)
This procedure is suitable for the following applications:
–
The drive is frequently started and accelerated.
– The drive has a heavily fluctuating torque profile.
For the set value "2" the following applies:
When a temperature alarm threshold is exceeded, the pulse frequency is reduced to a
permissible minimum. If the pulse frequency reduction is not sufficient for eliminating the
thermal stress on the power unit, then the output current is also reduced. When the I²t
alarm threshold is reached, only the output current is reduced while the pulse frequency
remains at the set value.
For the set value "12" the following applies:
In this case, the chip temperature is evaluated based on the load at the current time. If
this temperature exceeds the alarm threshold, the pulse frequency is reduced to a
permissible minimum. Unlike the set value "2", the pulse frequency is reduced based on
the chip temperature evaluation before the temperature alarm threshold has even been
reached. The output current is reduced if, in addition to the chip temperature, also the
alarm thresholds of the heat sink temperature and the I
2
t monitoring are exceeded.
Function diagram
FP 8021 Thermal monitoring, power unit