GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 3 Paramters/Functions
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Variable Description
PLL proven This boolean indicates whether the pll is locked. It is used
throughout the control as a permissive to run or check
various protections.
Line monitor volt The filtered AC line voltage magnitude which is used by the
Line Monitor function to protect the drive from overvoltage
and undervoltage conditions. It is calculated as the square
root of the sum of the squares of variables Y axis line
voltage and X axis line voltage.
Function configuration
The following table specifies the configuration parameters of the Phase Lock Loop
function.
Parameter Description
Utility feed Determines the bandwidth of the phase lock loop. 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 di esel-generato r or
other spongy line source. The bandwidth ratio of True
versus True is 4:1. Th e default settin g is True to assume a
utility feed.
Phase rotation req 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.
AC grid frequency The phase lock loop regulator clamp settings are
determined by this input. Run the Drive Commissioning
wizard to set this parameter.
Related functions
• Phase Imbalance Monit or
Related diagrams
• Phase Lock Loop Regulator (Ovr_PLL)