CHAPTER 4: SETPOINTS PROTECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–117
2. Voltage dependent overload curves are not applicable.
3. The motor status is evaluated using motor FLA and the IEC Curve k Factor setting.
TD MULTIPLIER
Range: 1.00 to 25.00 in steps of 0.01 - when thermal model curve is Motor,
0.00 to 600.00 in steps of 0.01 - when thermal model curve is Flexcurve
Default: 1.00
The multiplier is used to shift the overload curve on the time axis to create a family of the
different curves. The TD Multiplier value is used to select the curve that best matches the
thermal characteristics of the protected motor.
NOTE:
If thermal model curve is selected as “Motor”, then the TD Multiplier (TDM) can be specified
between “1.00” and “25.00” as indicated in the Standard Motor Curves diagram below.
Figure 4-33: Standard Motor Curves
NOTE:
During the interval of discontinuity, the longer of the two trip times is used to reduce the
chance of nuisance tripping during motor starts.
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