GE Industrial Solutions Millennium II Controller J85501P-1 - Manual (Page 64)

Basic Installation and User’s Guide for the Millennium II Controller
Issue 3 January 2008 64
rectifier shuts down.
• The Green ON LED on the rectifier blinks, the ALM LED
on the rectifier is not lit.
• After 5-6 seconds the rectifier initiates its own restart
signal again raising the plant voltage.
• The rectifier will shutdown and restart two additional
times.
• Upon the third shutdown, the rectifier’s ALM LED lights
and the rectifier’s display indicates “HO”.
• The controller receives the RFA signal from the rectifier
and initiates a restart signal 5-6 seconds later.
• The rectifier restarts again raising plant voltage.
• The rectifier shuts down and restarts 3 additional times.
• During these shutdowns the Green ON LED on the
rectifier blinks and the ALM LED on the rectifier is not
lit.
• Upon the fourth shutdown, the rectifiers ALM LED lights
and the rectifier’s display indicates “HO”.
• Any external RFA office alarm has occurred.
• The controller will wait 5-6 minutes and issue one final
restart signal initiating the final sequence of shutdown and
restart events before the rectifier locks out, requiring
personnel intervention.
o Prior to this occurring, change the value of the
system voltage to its original value. Press ENTER
to save the change.
o Restart the rectifier from the front panel by using
the menus:
8. Using the Float Settings Menu Screens, select Set Point.
9. Use the Arrows, and UP/DOWN keys to change the system float voltage
setpoint to it’s original value
This value must be at least 0.5V below the HV alarm threshold setting.
Press ENTER to save.
10. Controller Observations:
• The plant voltage returns to it’s original value
• Power Major alarm (PMJ) retires