GE Industrial Solutions Millennium II Controller J85501P-1 User Manual
Page 63
Basic Installation and User’s Guide for the Millennium II Controller
Issue 3 January 2008
63
Voltage alarm at the VOLTAGE ALARMS menu screen:
MENUÆCONFIGUREÆFLOAT SETTINGSÆVOLTAGE
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
• RECT and MAJ LEDs are illuminated
Rectifier Observations:
• When the voltage increases to the HV (FLOAT) level the