Anchor Farm, Trent, Dorset
Tel 01935 850750

Storing you grain store fans.

Thursday 18th December 2014

The pitfalls of bad storage of your fans out of season.

The incorrect storage of pedestal fans will affect the performance and longevity of service of your conditioning equipment. Build up of dust, will in extreme cases cause the impeller to run off balance and disintegrate. The internal motor elements can become clogged with dust leading to voltage leaking across terminals and short circuits.

Moisture can ingress into the capacitor and cause short circuits across the dielectric insulators resulting in premature failure of the components.

One of the most common repairs we see in the workshop is replacement capacitors.

Our single-phase fans require a "run capacitor" to energize the second-phase winding auxiliary coil to create a rotating magnetic field while the motor is running. Once the motor has started, the run capacitor is used to help the motor retain full power, providing 1.5 x the nominal system voltage and varying as needed depending on the load on the motor.

Run capacitors are designed for continuous duty, and they are energized the entire time the motor is running. The capacitor creates an even magnetic field which causes the motor to rotate

Capacitors can also fail due to not receiving the correct input voltage due to incorrect cable core diameters. As the cable length increases so will the resistance within that cable. For example if you run a single 1.1kW fan on a 50m extension cable you will reduce the voltage by 10.5 volts or 4.6% over that 50m length. This is based on a standard twin core and earth cable. This will result in poor motor performance and possible damage to motor components that have a tight supply voltage tolerance.

Please remember that we offer a service to fit the correct core diameter cable for the cable run that you require in your store and in so doing reduce the time and money wasted on low voltage motor and capacitor burnout.

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