GE 869 Instruction Manual page 210

SYSTEM
NOTE:
4–78
5. Analyze the captured waveform in Step 4 to see if the estimate value from Step 2 is
appropriate enough to mitigate the oscillations. If needed, repeat Steps 1-4 in order to
achieved the appropriate value of the setpoint "Motor Load Filter Interval" until
oscillations become negligible.
FUNCTION
Range: Disabled, Enabled
Default: Disabled
This setting enables the VFD configuration support in 869.
BYPASS SWITCH
Range: FlexLogic operand
Default Off
This setting defines the digital input to determine if motor is powered by the VFD or
directly from the AC source through bypass switch. The VFD Bypassed operand will be
asserted when VFD is bypassed i.e. motor is directly powered by the AC system or the
utility. This operand can be used to block the voltage based elements via Block setting of
the desired elements if this operand is not asserted i.e. VFD is not bypassed.
It is highly recommended to block the voltage based elements via Block setting of the
desired elements if VFD Not Bypassed is asserted.
STARTING FREQUENCY
Range: 3.0 to 72.0 Hz in steps of 0.1 Hz
Default: 10.0 Hz
This setting defines starting frequency, which provides faster tracking to the frequency
once motor is energized. For example, in the motor application when VFD is required at
the starting and normally the starting frequency is 10 Hz then set the Starting Frequency
equal to 10 Hz rather than nominal system frequency. If this value is not known then
simply set this value equal to the system Nominal Frequency.
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS