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CHAPTER 4: SETPOINTS
NOTE:
NOTE:
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
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.
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
During the interval of discontinuity, the longer of the two trip times is used to reduce the
chance of nuisance tripping during motor starts.
PROTECTION
4–117
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