Multilin SR469, Инструкция по эксплуатации

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S5 THERMAL MODEL 4. SETPOINT PROGRAMMING
4-26
4.6.2 SR469 THERMAL MODEL
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FUNCTION:
The primary protective function of the SR469 is the thermal model. It consists of five key elements: the overload curve and overload
pickup level, the unbalance biasing of the motor current while the motor is running, the motor cooling time constants, and the biasing of
the thermal model based on Hot/Cold motor information and measured stator temperature. Each of these elements are described in
detail in the sections that follow.
The SR469 integrates both stator and rotor heating into one model. Motor heating is reflected in a register called Thermal Capacity
Used. If the motor has been stopped for a long period of time, it will be at ambient temperature and thermal capacity used should be
zero. If the motor is in overload, once the thermal capacity used reaches 100%, a trip will occur. The thermal capacity used alarm may
be used as a warning indication of an impending overload trip.