Siemens SINAMICS G120 Operating Instructions Manual page 347

Features
The protective concept (see figure below) distinguishes itself as a result of the following
individual features:
● Protection is effective without using any temperature sensor (P0601 = 0). The
● It is possible to evaluate temperature sensors. This has the advantage that after a line
● When using a KTY84 sensor, the inverter can be parameterized so that a sensor wire
● Selectable temperature warning thresholds P0604 (default: 130 ｰC) for operation with the
● Selectable responses P0610 which are to be initiated when the warning threshold is
● The motor protection has been designed to be completely independent of the inverter
● Various data sets are taken into account in the model. The model is separately calculated
Figure 8-80
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
temperatures of various locations in the motor are indirectly determined using a
temperature model.
supply failure, precise initial temperatures are immediately available. Both PTC sensors
(P0601 = 1) as well as KTY84 sensors (P0601 = 2) can be connected and evaluated.
breakage or short-circuit F0015 is detected and the system automatically changes-over to
the temperature model. This means that the inverter is not shut down (tripped) and
operation can continue.
temperature model or KTY84 sensor. The inverter is shut down or the current reduced
depending on P0610 for a value of P0604 +10 %.
exceeded in order to prevent an overload condition.
protection. Warning thresholds and responses for inverter protection must be separately
parameterized.
for each data set so that when changing-over between various motors the cooling of the
presently non-active (fed) motors are taken into account.
Thermal motor protection
8.22 Thermal motor protection and overload responses
Functions
8-151