ABB GPS2436 User Manual page 67

STEP
Turn off all rectifiers except the rectifier under test by operating their power switches to STBY.
2.
Adjust the dummy load to provide 10 to 30% of the rectifier's output capacity.
3.
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.
The next step WILL RAISE the system voltage.
NOTE:
Use the Arrows, and UP/DOWN keys to change the system float voltage setpoint to 0.1V above the High
6.
Voltage Alarm Threshold.. Press ENTER to save.
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 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.
7.
• 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.
• Prior to this occurring, change the value of the system voltage to its original value. Press ENTER
• Restart the rectifier from the front panel by using the menus:
Page 67
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Action for Testing High Voltage Shutdown Alarm
to save the change.
GPS2436_MAN Rev. 1.3