Motor Maintenance - Hertz HSC serie Bedienungshandbuch

MAINTENANCE OF OIL RETURN (SCAVENGE) LINE
When the separator filter is separating the air from oil, some quantity of oil penetrates into the oil filter
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element. This oil is recovered to the system by return line.
When the compressor is operating at load, the oil flow from the scavenge hose should be seen.
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If the orifice in the scavenge line gets blocked, the oil level in tank rapidly decrease an oil penetrate into
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the compressed air system.
When discharging water underneath the air receiver; in case you observe oil or during some checks the
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oil level is decreasing, the scavenge line may be blocked. By stopping the compressor remove the
scavenge line and clean the orifice on the scavenge line by compressed air.
Do not expand the diameter of the scavenge orifice, otherwise the capacity of your compressor
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decreases.

MOTOR MAINTENANCE

For long life and effective use of the electrical motors you should consider a few important points.
Make the grounding of the compressor properly.
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Do not change the pressure related with the compressor operation, current and time adjustments. When
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the adjusted value is exceeded, the motor current will increase as the load will increase. This situation
may cause burning down of your motor.
Do not use products like the belts, separator and oil filters that have complete their service life. The
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maintenance activities that are no performed on time, will force the system mechanically and therefore
increase the load of your motor and compressor and shorten its life.
Keep the cooling fan, ventilation channels and the screen of the fan protective cover clean.
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Your elevation from sea level and medium temperature directly affects the cooling coefficient of the
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motor. In standard, your motor operates without problem at 1000 meters altitude and at 40 C° ambient
temperature. You may have to review the loading ratio at higher altitudes and warmer places.
Installation at altitudes of more than 1000 m above sea level (see also EN 60034-1)
Altitude of installation
At 40°C ambient temperature and thermal class B
Rated output reduced to approx.
At 40°C ambient temperature and thermal class F
Rated output reduced to approx.
Full nominal output to data tables with thermal class B
and ambient temperature of
Full nominal output to data tables with thermal class F
and ambient temperature of
BEARING GREASE
In standard motors up to 55 KW-75 HP power by use of ZZ series bearings the maintenance has been
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lubrication free. But after this power, the bearing lubrication has to be renewed. For bearing lubrication
use according to motor manufacturer directives. While your compressor is being produced it is filled with
motor bearing lubricant. If there in nothing else is indicated on the motor template; renew your motors
bearing lubricant in every 1500 hours (although this may change due to medium temperature and other
effects).
If you did not operate your compressor for a long time, renew the bearing lubricant before first start up.
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2000 m
92%
89%
32 °C
30 °C
55
3000 m 4000 m
84% 76%
79% 68%
24 °C 16 °C
19 °C 6 °C