GE Industrial Solutions Galaxy Verification - Manual (Page 22)

Galaxy Power System Verification Procedures
2 - 10 Galaxy SC Controller Performance Verification Procedures Issue 3 January 2008
High Float Voltage Alarm/High Voltage Shutdown Alarm
Tests, continued
HV/HVSD Test
Procedure for
Parallel Rectifiers
Do not raise the plant bus voltage if an active load is being served. To
test HVSD under this situation, ensure that sufficient battery reserve is
connected to the plant bus to support the plant load. The battery may
start sharing some load and BD alarms may turn on during this test.
Step Action
1 Disable Load Share on the rectifiers (if equipped) and adjust
the rectifier voltages until each is delivering at least 10% of
its capacity. Turn Off unneeded rectifiers if necessary to
accomplish this.
2 From the Front Display interface, use the path: MAIN →
CONFIG → THRESH and lower the HFV/Float level to 1
volt below the current float voltage. Verify that the Power
Minor relay has activated and the RECT and Minor LEDs
are active.
3 Next, use the path: MAIN → CONFIG → THRESH and
lower the HV/Float level to 1 volt below the current float
voltage. This should activate HVSD, turning Off all plant
rectifiers and placing the plant into a BD (Battery on
Discharge) condition. The BD, RECT, and Major LEDs
should all activate, along with the Power Major, BD, and
RFA alarm relays. After 5 seconds, all rectifiers will restart
and, following walk-in, will begin raising the plant back to
float. When the voltage passes the new HV threshold again,
HVSD will occur again and all rectifiers will remain locked
Off.
4 Use the path: MAIN → CONFIG → THRESH one final
time to reset the HFV and HV Float levels to their desired
normal settings (refer to table where initial settings have
been recorded) and then the path: MAIN
→ RECT RST to
restart all plant rectifiers, retiring the BD and RECT alarms.
5 Repeat the test for any rectifiers that were turned Off to
achieve the 10% minimum load capacity level of each
rectifier. After all rectifiers have been tested, adjust each to
plant float, if necessary, and reenable Load Share on the
rectifiers, if equipped.