- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 2 Faults and Troubleshooting •
••
• 2-19
No. Name Type Description
93 AC line freq low Alarm
The AC line freq low alarm occurs when the control firmware detects that the
frequency of the AC line is below the value of Under freq alm level, which has
a suggested value of nominal minus 17.3rad/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
under-frequency values are allowed below the threshold value without
causing this alarm.
This alarm will cease once the filtered value of filtered frequency has
increased to a value above below the value of Under freq alarm clr, which has
a suggested value of nominal frequency minus 15.7rad/sec.
Primary causes:
AC line frequency is transiently 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
94 Stat charger
timeout
Trip The Stat charger timeout trip fault occurs when the static charger is unable to
completely charge the DC bus. Normal charge operation terminates when the
DC bus reaches 90% of its nominal level. At this point the charger is turned
off and the switch gear is closed. If after around 70 seconds of charging the
DC bus does not reach this threshold then the trip fault is generated and the
charging sequence is aborted.
Primary causes:
Static charger failure.
DC bus capacitor defective.
95 Stat charger failed Trip The Stat charger failed trip fault occurs when the static charger reports a fault
during its operation. The DC bus charging procedure stops when the trip fault
occurs.
Primary causes:
Static charger failure.
96 Switchgear failure Trip
The Switchgear failure trip fault occurs when the AC line switchgear does not
close in response to a close command during the bus charging sequence.
The trip fault also occurs when the switchgear opens unexpectedly during
drive operation.
Primary causes:
Switchgear defective.
Switchgear opened via external command.
Switchgear tripped.
97 Vdc <200v after
5sec
Trip The Vdc <200v after 5sec trip fault occurs when the static charger fails to
charge the DC bus voltage to 200 volts within 5 seconds. The DC bus
charging procedure stops when the trip fault occurs.
Primary causes:
Static charger failure.
Local Fault or System Fault Active
DC bus shorted.
DC feedback not working.