ABB GPS2436 User Manual page 66

High Float Voltage Alarm – Systems with Actual Loads
Step
NOTE Clear all controller alarms for this test.
NOTE The System Voltage WILL NOT change.
The high float voltage alarm test is completed by changing the threshold for this condition
NOTE
below the system voltage to make it active.
1. Using the Float Settings Menu Screens, select Set Point and note thevalue..
2. Using the Voltage Alarms Menu Screens, note the High Float Alarm threshold value..
Use the Arrows, and UP/DOWN keys to change the High Float Alarm Threshold to 0.1V below the Sys-
3.
tem Voltage. Press ENTER to save.
Observe:
•
4.
•
Using the Voltage Alarms Menu Screens, change the High Float Alarm
5.
threshold value to it's original value. Press ENTER to save.
Observe:
•
6.
•
High Voltage Shutdown – New Installations Only
STEP
The High Voltage Shutdown Test is recommended only for new installations where a dummy load is
NOTE:
available prior to the application of office load, and batteries are connected.
1.
2.
3.
Because item 3 is difficult to achieve in a simulation test of properly functioning serial rectifiers, (even
NOTE:
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 subse-
quent shutdown the rectifier resets its restart counter. The controller initiates a restart signal a few sec-
onds 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.
Verify the Auto Restart is enabled from the front panel menus:
1.
Page 66
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Action for Testing the High Float Voltage Alarm
Power Minor alarm (PMN) is generated
RECT and MIN LEDs are illuminated
Power Minor alarm (PMN) retires
RECT and MIN LEDs are extinguished
Action for Testing High Voltage Shutdown Alarm
The plant voltage must be above the level set for the High Voltage alarm at the VOLTAGE ALARMS
menu screen: MENU CONFIGURE
The rectifier must be delivering a current of at least 10% of its capacity.
The rectifier's current output must be unbalanced by more than 10% from the average output cur-
rents of the other rectifiers.
FLOAT SETTINGS VOLTAGE ALARMS
GPS2436_MAN Rev. 1.3