- General Electric Computer Accessories User Manual

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