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Functions
7.5 Intrinsic device protection
7.5
Intrinsic device protection
Operating principle
The soft starter has integrated intrinsic device protection (power semiconductors and
bypasses) that prevents inadmissible thermal overloading of the switching elements.
In order to protect the bypasses and power semiconductors, the startup and maximum
operational currents of the motor are limited and the temperature monitored if current
measurement is available. In addition, the internal bypass is protected against an overload or
irreparable damage due to unintended opening of the bypass contacts.
The intrinsic device protection does not protect from short-circuit stress.
Note
Acknowledgment after cooling time has elapsed.
If the soft starter is switched off via a motor protection or intrinsic device protection tripping
operation, the action cannot be acknowledged using the "Reset" function until the displayed
cooling time has expired.
114
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
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