11.0 Maintenance and Service
CAUTION – Whenever maintenance and service is to be performed, it may be
desirable to shut unit down. Please refer to Start up and Shut Down procedures for
details.
CAUTION – Always assume AC and DC Voltages are present at the Lite-Minder
terminals because the inverter is capable of providing output voltage from the
batteries when there is no AC input. The unit can pass through AC voltages from input
to output with no batteries connected if the installation switch is on.
Routine Maintenance
Routine Maintenance should be considered any maintenance that does not require removing
the Inverters’ shroud (top/front cover). These maintenance items includes Circuit breaker re-
setting and periodic cleaning of dust from the cover and cabinet base to ensure proper
convection air flow. Since no fans are required on this system, air flow moves by convection.
Convection air circulation is from bottom to top as heat naturally rises.
Keep all foreign objects off the top and away from the sides of the unit as these may impede
convection air flow.
Lite-Minder automatically performs monthly tests (every 28 days) and keeps a log of all the
events and monthly tests in the event log. Lite-Minder has a self-clearing 28 day counter and
resets any time the unit transferred to battery power. If on day 14 the unit had a brief power
outage, the counter gets reset and 28 days later (pending no other transfers) a monthly test
would be performed.
Periodic inspection of the logs will see how the unit is performing. A quick test by manually
pressing the test button will transfer the system to Battery Power and will turn on all the
connected loads such as the Normally Off and the Switched Output load.
Ensure there are no faults present. If there are faults, please refer to the User Interface section
for a complete detail of what this fault may indicate.
Test
By pressing the TEST button on the front panel, the unit will transfer to Battery Power. This test
will run for at least 15 seconds and will exit back to Battery Charging upon synchronizing to
utility power.
Yearly Test
The NFPA code requires that a yearly test of 90 minutes be performed and the system must be
able to run the full 90 minutes without going into a LVD fault.
A yearly test of 90 minutes can be initiated by holding in the TEST button for 5 seconds. When
the system enters into the yearly test, the scrolling display will display90M TEST, MIN:XX,
where XX is the elapsed minutes during the yearly tests. The elapsed time starts at 00 and
ends at 90.
An alternate method of performing the 90 minute yearly test would be to turn off the input
breaker for the 90 minutes and then re-apply when the 90 minute duration is complete.
11.1 Battery Maintenance
The batteries used in the Lite-Minder are sealed lead calcium and are termed “Maintenance
Free”. This term may be misleading because ALL batteries require periodic maintenance even
if it only consists of a visual inspection. We recommend the following maintenance plan:
* Once every 3 to 4 months the batteries should be visually inspected for cracks, leaks,
bulging or deformities and corrosion buildup on terminals.
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