Thermal Monitoring And Overload Responses - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions

8.2 Thermal monitoring and overload responses

8.2 Thermal monitoring and overload responses
Description
The thermal power unit monitor is responsible for identifying critical situations. If alarm
thresholds are exceeded, the user can set parameterizable response options that enable
continued operation (e.g. with reduced power) and prevent immediate shutdown. The
parameterization options, however, only enable intervention below the shutdown thresholds,
which cannot be changed by the user.
The following thermal monitoring options are available:
● I
● Heat-sink temperature - A05000 – F30004
● Chip temperature - A05001 - F30025
If an overload occurs with respect to any of these three monitoring functions, an alarm is first
output. The alarm threshold p0294 (I
shutdown (trip) values.
Example
The factory setting for the alarm threshold for chip temperature monitoring is 15 Kelvin (K).
Temperature monitoring for the heat sink and inlet air is set to 5 K, that is, the
"Overtemperature, overload" alarm is triggered at 15 K or 5 K below the shutdown threshold.
The parameterized responses are induced via p0290 simultaneously when the alarm is
output. Possible responses include:
348
t monitoring - A07805 - F30005
2
I t monitoring is used to protect components that have a high thermal time constant
2
compared with semi-conductors. An overload with regard to I
converter load r0036 is greater than 100% (load in % in relation to rated operation).
Monitoring of the heat-sink temperature (r0037) of the power semi-conductor (IGBT)
Significant temperature differences can occur between the IGBT barrier junction and the
heat sink. These differences are taken into account and monitored by the chip
temperature (r0037).
t monitoring) can be parameterized relative to the
2
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
t is present when the
2
Drive functions