Thermal Monitoring And Overload Responses - Siemens SINAMICS S120 Function Manual

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Monitoring and protective functions

8.2 Thermal monitoring and overload responses

Thermal monitoring and overload responses

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 functions are active:

● 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.

The temperature difference between two sensors must not exceed more than 15 Kelvin (K);

a temperature difference of 5 K is set for the temperature monitoring of the heat sink and the

air intake. This means that 15 K or 5 K below the shutdown threshold an alarm is issued

regarding the pending overtemperature. Using p0294, it is only possible to change the alarm

threshold so that an alarm is received earlier. This means that an intervention can then be

made in the drive process (e.g. reduce the load, reduce the ambient temperature).

t monitoring - A07805 - F30005

t monitoring is used to protect components that have a high thermal time constant

compared with semiconductors. An overload with regard to I

converter load r0036 is greater than 100% (load in % in relation to rated operation).

Is used to monitor the temperature r0037.0 of the heat sink on the power semiconductors

Significant temperature differences can occur between the IGBT barrier junction and the

heat sink. The calculated barrier junction temperature is displayed in r0037[13...18]; the

monitoring ensures that the specified maximum barrier junction temperature is not

t monitoring) can be parameterized relative to the

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

t is present when the

Drive functions