GE Industrial Solutions Galaxy Vector Controller GCM3 - Manual (Page 40)

Galaxy Vector Controller GCM2, GCM3
3 - 6 Operation Issue 4 January 2008
Very High Voltage shutdown is usually 0.5V above the High
Float Voltage threshold for 48V plants and 0.25V above the
High Float Voltage threshold in 24V plants. Like the BD and
VLV thresholds, these are set in the Galaxy VC in the
configuration mode as described in the Installation,
Configuration and Operation section of this manual (Section 4).
S1.2 set to “0” will assign the HV/2ACF/VLV alarm contact to
the standard default of HV for the Very High Voltage shutdown
condition.
Voltage Sense Fuse Alarms
A lack of voltage on the Vsense +/- pair to the Vector Controller
as a result of a broken connection or a blown fuse while the
Vector is still powered results in a Voltage Sense Fuse alarm. A
voltage of 16.xx volts is displayed.
Sanity Fail in the Vector microprocessor or loss of power to the
Vector result in operation of the PMJ alarm. This PMJ defaults
to the alarm state if the controller is removed from the BLJ3.
AC Fail and Multiple AC Fail Alarms
If the proper ac input voltage is not available to any system
rectifier which is connected to the serial rectifier bus, an AC Fail
alarm (ACF) activates as a PMN. More than one ACF results in
a Multiple AC Fail alarm, changing this alarm status to a PMJ.
Note: S1.2 set to “1” will allow the HV/2ACF/VLV alarm
contact to be assigned to the Multiple AC Fail condition.
However, this will also cause the Flexent default configuration
values to be used any time the GCM is rebooted at power up.
Rectifier Failure and Multiple Rectifier Failure Alarms
Various rectifier failure modes cause a rectifier failure signal to
be issued to the controller, such as high voltage, temperature
over threshold, fan failure, and rectifier circuit breaker/fuse
open. Additionally, when rectifiers are removed or fail to
communicate with the Vector, a RFA alarm is generated. This
RFA alarm is cleared by updating the serial line in the
Operations and Control menu (see Configuration, Section
4).The RFA signal results in a RFA and Power Minor alarm
being issued by the Vector. More than one RFA at any time
results in a Multiple Rectifier Failure alarm and Power Major.
The Vector does not attempt restarts for RFAs caused by TA
(Thermal Alarm), CB/fuse trip, or Fan Failure.