Motor Maintenance; Bearing Grease - Hertz HDD Series Instruction Manual

MAINTENANCE

9.3.13 Motor Maintenance

For the electric motors to have long life and operate in high performance, the following
measures should be taken:
➢ Properly ground the compressor.
➢ Do not change the pressure, thermal current and time settings for the compressor operation. In
cases where the preset value is exceeded, the load would be increased, so that the motor
current would be higher. It may result in burning of your motor.
➢ Do not use any separator, oil filter and similar products beyond their useful service life. As the failure
in performing maintenance works in due time would mechanically force the system, the
compressor and motor would be overloaded, and their useful life would be shortened.
➢ Keep clean the cooling fan, ventilation ducts and fan protective cover grill.
➢ The altitude from sea level and ambient temperature directly affects the motor cooling
coefficient. In standard conditions, your motor would properly work without any problem in 1000
meter altitude and up to the ambient temperature of 40 degrees Celsius. The loading rate should be
reviewed in higher altitudes and temperatures.
ALTITUDE (up to)
%
AVG. TEMPERATURE (up to) 30
%

9.3.14 Bearing Grease

➢ The standard motors 4 kW to 37 kW (5 to 50 HP) are maintenance free without any need for
lubrication by the use of ZZ series bearings. However, the bearings should be lubricated for motors
with higher power output. The type and amount of the grease to be used for the bearings is shown
on the motor label. If the grease type is not shown on the motor label contact our service
department. You compressor has been filled with motor bearing grease before factory dispatch. If it
is not shown on the motor plate or any other locations, apply grease based according to
manufacturer manual of operation depending on the ambient temperature and other conditions.
If you are storing more than 6 months, apply bearing grease before the first start.
1000 1500 2000 2500
100 98 95
35 40 45
100 100 100 97
74
3000 3500 4000
91 87 83 78
50 55 60
93 87 82
meters
°C