WEGER WALTER GMBH DIWER EVO DP80 Series, Installation And Operating Manual

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Installation and Operating Manual Page
44
Printed: 02/2015
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Check whether the impeller is running smoothly without excessive vibration.
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Determine the resonance range of the impeller. If the resonance range of the
impeller overlaps with the operating range, make the necessary adjustments at the
frequency converter to ensure that the resonance range is run through quickly.
Excessive vibration due to imbalance, caused for example by transport damage,
incorrect handing of the components or operation within the resonance range can
cause serious damage to the unit.
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Avoid frequent starting and stopping.
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Measure the gap (S). This gap must be of the same width along the entire
circumference. The gap overlap (R) must correspond to approx. 1% of the impeller
diameter. (See figure A.)
Maintenance and repair
Every 12 months, check the fan for mechanical vibration according to DIN ISO 14694. The
maximum permissible vibration rate is 2.8 mm/s (measured at the bearing plate of the
motor bearing at the impeller side).
Depending on the application and the conveyed medium, the impeller and the housing
are exposed to normal wear. Deposits on the impeller can cause imbalance and thus
damage (risk of total failure).
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The impeller might even rupture, posing a risk of fatal injury!
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For the maintenance of the motor, observe the instructions of the motor
manufacturer.
For all maintenance and repair work, observe the following:
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Do not bend the fan blades, as this could result imbalance!
After (re)installation of the impeller, the entire rotating unit must be balanced according
to DIN ISO 1940-1.
If there is any damage (e.g. to windings), please contact our service department.
Check the impeller, and in particular the welds, for cracks.
Cleaning
Regular inspection and cleaning are necessary in order to prevent imbalance.
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Clean the flow area of the fan.
The maintenance intervals are determined by the level of contamination of the impeller.
Clean the entire fan with a damp cleaning cloth.
Do not use aggressive detergents or products that might damage the paintwork.
Never use a high-pressure washer or water jet.
If water has entered the motor:
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Allow the winding to dry before starting the unit.
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Replace the ball bearings of the motor.
Wet cleaning can result in fatal injury from electric shock!