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9.0 DIAGNOSTICS AND TROUBLESHOOTING
9.1 Introduction
Through good practice, cumulative issues can be prevented through basic maintenance.
In the unlikely event that something goes wrong with the Microstar Precision Air Heater,
we will cover how to solve some of the more common problems. Finally, if the need
arises, we will cover how to replace various parts for the load bank.
In this section, you will learn:
—
How to perform preventative maintenance on the equipment
—
Some of the common issues you may run into and how to troubleshoot these
items independently.
—
About the part names and numbers.
9.2 General Maintenance
The load bank has been designed to require minimum maintenance. All components
have been chosen for a long, reliable life. Two basic intervals of maintenance are
required: each operation and every 50 hour
or 6 months (whichever comes first).
9.2.1 Each Operation
The air intake and exhaust screens
must be checked for any obstructions
or foreign objects. Check fan blades
for stress fractures. Due to the high
volume of air circulated, paper and
other items can be drawn into the air
intake. During load bank operation
ensure that the air is exiting from the exhaust vent.
The load branches should be checked for blown fuses or opened load resistors.
To check the fuses or load resistors, operate the load bank from a single phase
source. If your fuse is blown on any branch, you will detect no current. In
addition, if the fuses are checked, you will not have continuity.
9.2.2 Every 50 Hours or 6 Months
Check the tightness of the electrical connections. The expansion and contraction
caused by heat from the load bank operation may result in loose connections.
The vibrations caused by the cooling fan may also loosen electrical connections.
If the load bank is transported “over the road”, the electrical connection should
be checked for tightness at a shorter-than normal time interval. See “4.3 Primary
Inspection” on page 11 for an inspection guide.
WARNING
Always remove all power from
the load bus and all fan/control
power before servicing the load
bank. Never operate or service
a load bank that is not properly
connected to an earth-ground.
