GE Industrial Solutions GPS4827 - Manual (Page 80)

Galaxy Power System GPS4827
78
1. The plant voltage must be above the level set for the High
Voltage alarm at the VOLTAGE ALARMS menu screen:
MENUCONFIGUREFLOAT SETTINGSVOLTAGE ALARMS
2. The rectifier must be delivering a current of at least 10% of its
capacity.
3. The rectifier’s current output must be unbalanced by more than
10% from the average output currents of the other rectifiers.
Because item 3 is difficult to achieve in a simulation test of properly
functioning serial rectifiers, (even with load share disabled), rectifiers
are tested one at a time, rather than as a group. Slightly different test
procedures are used for special applications in batteryless plants. Serial
rectifiers have their own internal restart circuits which will function 3
times before the rectifier locks itself out and initiates a High Output
Rectifier Fail Alarm to the controller. If there is a sufficient interval
between restart and a subsequent shutdown the rectifier resets its
restart counter. The controller initiates a restart signal a few seconds
after the
first RFA (HO) alarm is received. After the second RFA (HO) is received,
the controller waits 5 minutes before sending one additional restart
signal.
1. Verify the Auto Restart is enabled from the front panel menus:
2. Turn off all rectifiers except the rectifier under test by operating their
power switches to STBY.
3. Adjust the dummy load to provide 10 to 30% of the rectifier’s output
capacity.
4. Using the Voltage Alarms Menu Screens, note High Voltage Alarm
threshold value. _________
5. Using the Float Settings Menu Screens, select Set Point and note the
value. ________
NOTE: The next step WILL RAISE the system voltage.
6. Use the Arrows, and UP/DOWN keys to change the system float voltage
setpoint to 0.1V above the High Voltage Alarm Threshold.. Press ENTER
to save.
7. Controller Observations:
The plant voltage increases
Power Major alarm (PMJ) is generated