Functions
3.6 Motor protection
M200D PROFIBUS/PROFINET
44 Manual, 08/2014, A5E01577426A/RS-AA/004
The idle time is a time specification for the cooling characteristics after operational tripping,
that is, not in the case of overload tripping.
After expiry of this time, the thermal memory of the motor starter is deleted. Cold restart is
possible.
With appropriately adapted dimensioning of the drive, higher switching frequencies are thus
possible without exceeding the trip limit of the motor model.
Higher switching frequencies result in higher motor heating. If the motor dimensioning has
not been adapted (thermal class), motor protection is no longer guaranteed.
The following schematic shows the cooling characteristics with and without idle time.
Figure 3-5 Cooling characteristics with and without idle time
Motor heating
• Motor heating > 50 %: After idle time, the save value of the motor model is reduced to 50%.
• Motor heating < 50 %: After idle time, the save value of the motor model is reduced to 0 %.
To Next Page
Loading...
