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5.2 Preventing low loads
To avoid cylinder glazing, high oil consumption or
other damages to the engine, it is recommended that a
unit is always used with a load > 30% of nominal.
Corrective actions should be taken if due to
circumstances this minimum load capacity cannot be
obtained. Operate the unit at full load capacity after
any low load operating period. Therefore, connect the
unit periodically to a load bank. Increase the load in
steps of 25% every 30 minutes and allow the unit to
run for 1 hour in full load condition. Gradually return
the unit to the operating load.
The interval between load bank connections may vary
according to the conditions present on site and the
amount of load. However, a rule of thumb is to
connect a unit to a load bank after every maintenance
operation.
For more info on this operation, please contact your
Atlas Copco Service Center.
5.3 Alternator maintenance
procedures
5.3.1 Measuring the alternator
insulation resistance
A 500 V megger is required to measure the alternator
insulation resistance.
If the N-terminal is connected to the earthing system,
it must be disconnected from the earth terminal.
Disconnect the AVR.
Connect the megger between the earth terminal and
terminal L1 and generate a voltage of 500 V. The
scale must indicate a resistance of at least 1 M.
Refer to the alternator operating and maintenance
instructions for more details.
5.4 Engine maintenance
procedures
Refer to the Engine Operation Manual for a full
maintenance schedule.
5.4.1 Engine oil level check
Consult the Engine Operation Manual for the oil
specifications, viscosity recommendations and oil
change intervals. For the intervals, see also section
“Maintenance schedule” on page 39.
– Check the engine oil level by using the oil level
dipstick (OLD).
– Top up with oil, if necessary.
Refer to the Engine Operation Manual for more
detailed instructions.
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