Maintenance by a qualified person

The unit must be regularly checked and maintained. In particular, ensure:

• unimpaired flow in the air duct.
• the effectiveness of the protective grilles.
• compliance with the permitted temperatures.
• quiet bearings. Bearing life of 40 000 hours, depending on application.
• cables are secure in the terminal box. Cable screw connections in accordance with standard EN 60079-1 (Ex “d”) must be used.
• potential damage to the terminal box, cable screw-connections, sealing plugs and cables.
• secure routing of cables.
• Closures made of plastic or light metal alloys are not permitted.
• Ex equipment sealing plugs or Ex component sealing plugs must be in accordance with EN 60079-1, Annex C.
• Sealing plugs must not be used together with a thread adapter.

During regular safety checks (maintenance interval), undertake a complete check in accordance with the previous test schedules.

This involves checking the function of safety components, air gap, power consumption, bearing noise, damage and disproportional vibration (e.g. impeller imbalance). Remove dirt and foreign particles.