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MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 57
Rectifier Current Share Test
Verify that the highest rectifier current and the lowest current are within 5 amps.
System Current Test
Verify the System current equal to the total of the rectifier currents. System current should
equal the total current of the loads as well as any battery current.
Rectifier Alarm Test
1. Verify that all of the rectifiers report RFA Alarm is off.
2. Verify that the battery voltage reading on the voltmeter is negative (-)54.00 + 0.02Volts.
3. Remove 1 rectifier and verify that you get a Minor alarm for Rect 1 of n failure on the
controller and the customer remote alarm panel.
4. Remove the second rectifier and verify that you get a Major alarm for Rect 2 of n failure
on the controller and the customer remote alarm panel.
5. After the fan has completely stopped spinning, insert a plastic pen or plastic screwdriver
into the fan blade of one of the rectifiers and reinsert both rectifiers
6. Verify that you get the fan fail alarm on controller and the customer remote alarm panel.
7. Remove the fan fail device.
System Temperature Test
Verify that the system temperature is correct.
Battery Current Test
1. Measure the battery current with a clamp-on meter.
2. Verify that the battery current is below 5 amps.
3. Verify that the displayed battery current is within + 5 amps. Adjust OEM/S Offset if
required.
4. Determine the total battery capacity at the site:
Cells connected in series make up a string, and the capacity is determined by the
capacity of a single cell. Add amp/hour capacity for all strings connected in parallel.
Enter the total battery capacity in the appropriate box on the Site Form.
5. Determine the Max. Batt. Recharge rate:
Divide Total battery capacity by 20 hours and enter it in the appropriate box on the Site
Form.
6. Verify that the Max. Batt. Recharge rate is set to the calculated value.
7. Remove AC power to the rectifiers purposely causing the battery discharge alarm to
come on.
8. Verify that the System Current is 0 + 5 amps.
9. Verify that the battery current is within 5 % of the system current recorded previously.
10. Verify that the Battery Discharge Alarm is on.
11. Restore AC power to the rectifiers.