Motors - NOVENCO ZERAX AZL-AZN-AZW Installation And Maintenance Manual

Vibrations that occur in operation may be due to accumulation of dust and dirt on the hubs and
blades. If vibrations persist after cleaning, expert assistance should be called for immediately.
Continued operation with vibrations shorten the life of the fan and motor bearings.

6.6 Motors

Refer to the motor manufacturer's documentation and the nameplates for how to service the
motors.
Motor maintenance
• Inspect the motor for wear signs and
• Clean the motor casing, motor cooling
• Lubricate bearings
Novenco ZerAx axial fan types AZL-AZN-AZW – Installation and maintenance
damaged parts.
fan and motor shell.
Refer to the motor manual for service information such as lubrication intervals, grease
amounts, when to replace bearings etc. Observe differences between motor Drive End (DE)
and Non-Drive End (NDE).
- Permanent magnet motors are lifetime lubricated. Bearings may, however, need
replacement.
- AC motors up to size 132 have lifetime-lubricated
bearings. Motor sizes 160 to 280 require lubrication
according to the manufacturer's instructions.
Fans with motor sizes 225 to 280 have nipples on the
outer fan casings. For fans with motor sizes 160 to 200,
nipples on the outer fan casings are optional.
Refer to the motor nameplates for recommended
grease type, amount and interval.
• Drain the motor of condensed water.
• Check supply cables and electrical
connections for impairments.
• Check terminal box seals and cable
glands.
Use a manual grease
gun for lubrication.
Excess grease causes
bearings to overheat and
results in failure.
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