Donaldson Torit Dust Collector UMA 250V

Fan assembly removal/replacement (UMA 70-750)

Isolate electrical power supply.

2 On UMA 750 collectors only – Remove door frame centre member, remove mattress support frame from its storage position and remove fork lifting beam.

3 Disconnect electrical cables from terminal box.

4 Remove fan outlet grille cover plate.

6 The fan assembly can now be removed using a suitable lifting arrangement.

Renewing fan impeller and/or motor:

Warning: Ensure you are wearing appropriate PPE before starting the procedure.

Open secondary/absolute filter door.

UMA 40MM – Lift bar to release sealing mechanism.

UMA 100-450 – Undo clamping nuts or clips as appropriate and remove retaining mesh or frame.

UMA 750 – Undo clamping nuts sufficient to allow element removal.

Remove used element, place it directly into a plastic bag and then seal the bag.

Slide the new element into the housing, with the element seal against the secondary/absolute filter seal frame, until it reaches the backstop.

Clamp element in position using the arrangement provided.

Close secondary/absolute filter door.

Warning: This inspection requires trained personnel with PPE!

Enter the pressure differential across the filter assembly

Is the cleaning mechanism functioning properly?

Enter the filter resistance measured by U-tube manometer or differential-type pressure gauge

Is the filter resistance within the normal range?

Is the secondary or absolute filter monitor functioning properly?

Is the general casing integrity satisfactory?

Are door fastener threads lubricated?

Is the ignition minimising fan's lining inside the casing in good condition?

Pressure drop across the filter assembly

Record the figure in the log book

Pressure drop increased significantly over two or three successive checks?

Check the filter if the pressure drop increased significantly

Pressure drop across the secondary or absolute filter

Change the filter when the pressure drop reaches 100 mm W.G.

Inspect the explosion relief assembly weekly

Ensure the bursting panels are intact and clear of obstruction

Prevent build-up of snow or ice on explosion panels during winter

1) Flameproof maintenance – It is important that all flameproof enclosures, motors, and cable glands are inspected for corrosion and tightness on an annual basis.

In particularly aggressive environments, this inspection should be carried out more frequently.

2) Antistatic earthing (if fitted) – Check collector earthing continuity.

3) Explosion risks – Check measures taken to avoid ignition sources are still in place.

4) Fan maintenance – Inspect the fan thoroughly. This is achieved on UMA 40 collectors by removing acoustic diffuser, if necessary, and looking through cleaned air outlet; on UMA 40MM collectors by unbolting and removing fan power pack and inspecting; on all other collectors by unbolting and rotating fan assembly and looking through fan inlet eye.

If necessary, remove all residual dust accumulation. (Although the fan is located on the clean side of the collector, it is possible for low quantities of dust to migrate through the filter media).

The fan should be inspected immediately after any period of significant dust emission, i.e. due to damaged filter media or seal etc.

The fan should be inspected immediately if there is any unexpected noise, temperature or vibration.

The fan should be inspected every twelve months or immediately following any misuse.