- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions •
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• 3-71
Parameter Description
Utility feed
Determines the bandwidth of the Phase Lock Loop function. If
set to True, the bandwidth is set to obtain an amount of
“sluggishness” appropriate for a utility feed. The pll will be
more robust and less sensitive to unreal disturbances. It
should be set to True only if the line is a diesel-generator or
other spongy line source. The bandwidth ratio of True versus
True is 4:1. The default setting is True to assume a utility feed.
Phase rotation req
Determines the phase sequence the Phase Lock Loop
function expects. The Phase Lock Loop function can lock to
either “forward-ABC” or reverse phase sequence. The fault,
AC line rev phs seq will occur if the wrong sequence is seen
by the control. The default setting is Forward sequence.
Faults and alarms
The Line Monitor function generates the 12 faults and alarms mentioned above in the
function configuration section.
Function description
The Line Monitor function monitors the filtered ac line voltage (variable Line
monitor volt) for overvoltage and undervoltage conditions. The function also
monitors filtered ac line frequency (variable Line monitor frq) for overfrequency and
underfrequency conditions. If Line monitor volt or Line monitor frq surpasses a
threshold, the appropriate alarm or trip fault occurs. The thresholds are configured
when the Drive Commissioning wizard runs and can be changed later by the Line
Protection Setup wizard. See the above function configuration section for an
explanation of the thresholds.
Related functions
• Phase Imbalance Monitor
• Phase Lock Loop
Related diagrams
• Line Monitor Overview (Ovr_Lin_Mon)