GE Medium Voltage GP Type G Drives AC line voltage too low, Suggested value of 88% of nominal

No.	Name	Type	Description
88	AC line under volt	Trip	The AC line under volt trip fault occurs when the control firmware detects that
			the magnitude of the ac line is below the value of Line UV fault level, which
			has a suggested value of 50% of the nominal ac line input.
			The voltage magnitude used for this comparison is a low-pass filtered version
			of the signal. The filter is set to 1.2 rad/sec as a default, so transient voltages
			below the alarm turn-on value can occur without causing this trip fault.
			Primary causes:
			AC line voltage too low.
			Possible configuration faults:
			Source has been applied at a voltage other than that set by the factory.
			Possible board failures:
			VATF-SRC
			FOSA
			BICM
			DSPX
89	AC line volts low	Alarm	The AC line volts low alarm occurs when the control firmware detects that the
			magnitude of the ac line is below the value of Line UV alarm level, which has a
			suggested value of 88% of nominal.
			The voltage magnitude used for this comparison is a low-pass filtered version
			of the fastest version. The filter is set to 1.2 rad/sec as a default, so transient
			voltage above the alarm turn-on value can occur without causing this alarm.
			This alarm will cease once the filtered value of voltage magnitude has
			increased to above the value of Line UV alarm clear, which has a suggested
			value of 90% of nominal.
			Primary causes:
			AC line voltage is marginally low.
			Possible configuration faults:
			Source has been applied at a voltage other than that set by the factory.
			Possible board failures:
			VATF-SRC
			FOSA
			BICM
			DSPX
90	AC line over freq	Trip	The AC line over freq trip fault occurs when the control firmware detects that
			the frequency of the AC line is above the value of Over freq flt level, which
			has a suggested value of 125% of nominal.
			The frequency value used for this comparison is a low-pass filtered version of

the fastest version. The filter is set to .2 rad/sec as a default, so transient over-frequency values are allowed above the threshold value without causing this trip fault.

Primary causes:

AC line frequency is excessive.

Possible configuration faults:

Source has been applied at a 60hz while the factory setup value, AC grid frequency was at 50hz.

Possible board failures:

VATF-SRC

FOSA

BICM

DSPX

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 2 Faults and Troubleshooting • 2-17