Chapter Five
5 - 2
Safety Warning
Maintenance work should be undertaken only by qualified personnel who are fully aware
of the danger involved and who have taken adequate safety precautions.
Always isolate all the supplies to the equipment before inspecting, moving equipment,
removing or replacing parts.
Work on the equipment while the electrical supplies are connected is not normally
necessary. If it should become necessary for any reason, take extreme care not to come in
to contact with live parts.
You should remain alert at all times when the unit is in operation. There are three main
sources of danger:
Electricity can kill. Serious injury or death could result from contact with electrically live
parts. Even though the connections to the load bank may be temporary, they must always
be made to the same standards as if they were permanent.
Load banks contain fast moving parts. The fan, in particular, can cause serious injury if
you come into contact with it when it is in operation.
Load banks produce a lot of heat. When a test is in progress the resistive element can
glow cherry red. The heat they produce is removed by the air that the fan forces past them,
but that air in turn can become very hot.
Maintenance & Troubleshooting
5 - 3
Routine Maintenance Procedures
To keep the load bank in good working order, carry out the following maintenance tasks at
the specified intervals:
Daily (after transportation or before each use of the load bank):
• Inspect the equipment for signs of damage.
• Ensure that the inlet and outlet grilles are free from dirt, debris or obstruction. Remove
the grilles and clean them if necessary.
• Check that both the external supply and the Supply-on-Test are properly connected.
• Visually check that all cable connections are tight and that there is no sign of
overheating.
• Check that the connecting cables are free from damage.
• Check that all cables are secured and routed so that they do not present a safety
hazard.
• Inspect the doors and door gaskets to ensure they are undamaged and make a good
seal to the main frame. Replace if necessary.
• Ensure that all opening panels are securely closed.
Monthly
• Clean and inspect painted surfaces for damage or corrosion and touch up as necessary.
• Check that there is no build up of dirt or debris on the load elements.
• Check that the fan rotates freely.
• Check that the fan blades are tight, and that the fan boss is securely fastened to the
motor shaft.
• Check that the anti condensation heaters (if fitted) are working.
• Isolate the supply and then inspect both the inductive and resistive load element
terminals, ensuring that they are tight and show no signs of overheating.
• Open the load bank switchgear cabinets and visually inspect the wiring, fuses and
contactors for signs of overheating.
• Inspect the switchgear cabinet air filters (6 per duct, located behinf the maintenance
doors) and clean or replace if necessary
• Check that all drain holes in the bottom of the load bank are clear of debris. There are
two located in the bottom of each switchgear and control cabinet and several drain
holes in the floor of the container.
• Inspect all door seals for damage and replace where necessary.
Warning! The fan, can
cause serious injury
when it is in operation.
Ensure that the supply
is isolated before re-
moving safety covers.
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