Huawei NetCol8000-E220 User Manual page 120

NetCol8000-E220 Modular Indirect Evaporative Cooling
System
User Manual
Fault
Type
Excessively
small
airflow
volume
Vibration
Abnormal
noise
Dangers Caused by Current
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Air Filter
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Issue 02 (2019-10-10)
Possible Cause
The fan is rotating slowly.
The air channel is
blocked.
The pressure loss is
different from the
designed value.
Imbalance
Bearing damage or wear
Fan blade
friction/collision
The fan is operating in the
stall zone (applicable to
an axial fan)
The concentricity of the
air intake ring is incorrect
(applicable to a
centrifugal fan).
Electrical components can only be operated by professional electricians or persons
familiar with electricity, or under the supervision of an electrician.
Comply with five electrical safety regulations.
Do not operate when the equipment is powered on. Even after the equipment is powered
off, the intermediate circuit is still energized. Wait at least 3 minutes.
To disconnect electrical connections safely, take other measures if necessary.
For all operations on energized parts or circuits, there must always be two persons
present, so that one person can cut off the power supply in the case of emergency.
The ventilation equipment can only be connected to a circuit with an omnipolar isolator
switch.
Follow the local standards for electromagnetic compatibility of the entire equipment.
Periodically check the electrical equipment. Tighten the loose connector and replace the
damaged conductor or cable immediately.
When the final resistance of the air filter reaches the specified value, clean or replace the
air filter. Air filters are wearing parts.
Copyright © Huawei Technologies Co., Ltd.
6 System Operation and Maintenance
Solution
heat sink).
Check the fan speed.
Check whether the airflow is smooth (air
intake/exhaust valve and air filter).
The fan blade is blocked or polluted.
Check the selected fan.
Check whether the fan blades are damaged,
polluted, or frozen.
Replace the bearing.
Clear the foreign matters or dirt from the fan.
Check whether the airflow is smooth (air
intake/exhaust valve, and air filter).
Observe the installation precautions.
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