ABB GPS2436 User Manual page 65

Step
The following procedure is applicable only in plants with Load shunts in a plant configured for
NOTE:
"Centralized Architecture"
Using a calibrated DVM, measure the plant load from the sense connection points on the plant
1.
shunt(s).
Calculate the plant load, in amperes, as measured by the DVM.
a.
2.
b.
This value is the plant load measured by the DVM, in amperes.
Using the Meter Calibration Menus, reset the plant Plant Current reading by selecting RESET LOAD. Press
3.
the Enter key to reset the load. This will remove any pre-existing user calibrated values if they exist.
4. Wait at least 5 seconds and press the ESCAPE key.
Select CALIBRATE LOAD. Use the Arrows, and UP/DOWN keys to calibrate the system Load. Press
5.
ENTER to save.
NOTE: The maximum total change is +/-10% of the current load value.
Press the <ESCAPE> key until the default screen is displayed. Verify that the plant current reading
6.
has been changed.
NOTE: This operation is performed and verified ONLY if plant load is constant during the calibration procedure.
Observation:
•
High Float Voltage Alarm – New Installations
Step
NOTE: Clear all controller alarms for this test.
The high voltage alarm test is completed by raising the plant voltage
NOTE:
above the threshold set for HFV (High Float Voltage) .
Raising the plant voltage on a working system is left to the discretion of the user.
•
NOTE:
•
•
1. Using the Voltage Alarms Menu Screens, note High Float Alarm threshold value.
2. Using the Float Settings Menu Screens, select Set Point and note the value.
NOTE: The next step WILL RAISE the system voltage.
Use the Arrows, and UP/DOWN keys to change the system float voltage setpoint to 0.1V above the
3.
High Float Alarm Threshold.. Press ENTER to save.
Observe:
•
4.
•
•
Using the Float Settings Menu Screens, select Set Point.
5.
Use the Arrows, and UP/DOWN keys to change the system float voltage setpoint to it's original
6.
value. Press ENTER to save.
Observe:
•
7.
•
•
Page 65
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Action for Voltage Calibration
Divide the mV DVM reading by the rated shunt mV value
Multiply this result by the shunt ampere rating
Displayed System load changes to new value.
Action for Testing the High Float Voltage Alarm
This test could disrupt power to working equipment.
If the test is performed, verify that the plant is in FLOAT mode
Rectifier voltage has been set to the normal level after completing the test.
The plant voltage increases to the set voltage
Power Minor alarm (PMN) is generated
RECT and MIN LEDs are illuminated
The plant voltage decreases to the original set voltage
Power Minor alarm (PMN) retires
RECT and MIN LEDs are extinguished
GPS2436_MAN Rev. 1.3