GE 2300 V manual AC line frequency is marginally excessive, Frequency was at 50hz

No.	Name	Type	Description
91	AC line freq high	Alarm	The AC line freq high alarm occurs when the control firmware detects that the
			frequency of the AC line is above the value of Over freq alm level, which has
			a suggested value of nominal frequency plus 17.3 rad/sec.
			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 alarm.
			This alarm will cease once the filtered value of filtered frequency has
			decreased to below the value of Over freq alm clear, which has a suggested
			value of nominal frequency plus 15.7rad/sec.
			Primary causes:
			AC line frequency is marginally excessive.
			Possible configuration faults:
			Source has been applied 60hz while the factory setup value, AC grid
			frequency was at 50hz.
			Possible board failures:
			VATF-SRC
			FOSA
			BICM
			DSPX
92	AC line under freq	Trip	The AC line under freq trip fault occurs when the control firmware detects that
			the frequency of the AC line is below the value of Under freq flt level, which
			has a suggested value of nominal of 50% 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 under-frequency values are allowed below the threshold value without causing this trip fault.

Primary causes:

AC line frequency is low.

Possible configuration faults:

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

Possible board failures:

VATF-SRC

FOSA

BICM

DSPX

2-18 • Chapter 2 Faults and Troubleshooting Innovation Series Medium Voltage GP Type - G Drives GEH-6385