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.
Summary of Contents for SR469
Page 7: ......
Page 19: ...2 INSTALLATION MECHANICAL 2 5 2 1 5 TERMINAL LOCATIONS Figure 2 11 TERMINAL LAYOUT...
Page 21: ...2 INSTALLATION ELECTRICAL 2 7 Figure 2 12 TYPICAL WIRING DIAGRAM...
Page 32: ...ELECTRICAL 2 INSTALLATION 2 18 2 2 14 TYPICAL 2 SPEED MOTOR WIRING...
Page 39: ...OVERVIEW 3 SR469 OPERATION 3 6 yy SETPOINTS yy S1 SR469 SETUP...
Page 104: ...4 SETPOINT PROGRAMMING S11 MONITORING 4 65 Figure 4 24 TRIP COIL SUPERVISION...
Page 113: ...S12 ANALOG I O 4 SETPOINT PROGRAMMING 4 74...
Page 244: ...8 469PC PROGRAM WAVEFORM CAPTURE 8 13 Figure 8 11 WAVEFORM CAPTURE...