Maintenance - AUMA SAEx 25.1 Operation Instructions Manual

13.2 Maintenance

Maintenance intervals In compliance with EN 60079-17, Ex certified products either require repeated testing
Manual operation During maintenance, the mechanical parts of the handwheel activation, in particular
Lubrication •
Notes relating to mainten-
ance
at an interval of 3 years or continuous monitoring by trained personnel.
motor coupling, must be checked. Replace the parts in case of visible wear.
In the factory, the gear housing is filled with grease.
• Additional lubrication of the gear housing is not required during operation.
• Grease change is performed during maintenance
– Generally after 4 to 6 years for modulating duty.
– Generally after 6 to 8 years if operated frequently (open-close duty).
– Generally after 10 to 12 years if operated infrequently (open-close duty).
• We recommend replacing the seals when changing the grease.
• Perform visual inspection of actuator and mounted accessories. Ensure that no
outside damage, changes or leakage of grease and oil are visible.
• Check actuator for unusual running or grinding noise or vibration which might be
an indication of bearing or gear damage.
• Electrical connection cables must be placed properly and in perfect condition.
• Thoroughly touch up any possible damage to painting to prevent corrosion. Ori-
ginal paint in small quantities can be supplied by AUMA.
• Check whether Ex connections are fastened correctly.
• Take care of possible discolouration of the terminals and wires. This would indic-
ate an increased temperature.
• For Ex housings, pay special attention to a possible collection of water. This may
originate from "breathing" due to severe temperature variations (e.g. change of
night and day), from damaged seals etc. Remove any water immediately.
• The process temperature range must be within the range of the specified ambient
temperature.
• Check the flame path gaps of flameproof enclosures for dirt and corrosion.
• Since the dimensions of all flameproof joints are strictly defined and inspected, no
mechanical work (such as grinding) shall be performed on them. The joint sur-
faces have to be cleaned chemically (e.g. with Esso-Varsol).
• Consult manufacturer for indications regarding flameproof joints.
• Repair interventions on flameproof joints is not permitted.
• Prior to fitting, preserve joint surfaces with an acid-free corrosion protection agent
(e.g. Esso Rust-BAN 397).
• Thoroughly handle all housing covers and check sealing elements.
• All cable and motor protection components have to be checked.
• If defects impairing the safety are detected during maintenance, repair measures
have to be initiated without delay.
• Any kind of surface coating for the joint surfaces is not permitted.
• When replacing parts, sealing elements, etc. only original spare parts shall be
used.
• Cables and wire entries, blanking plug, cable glands, plugs etc. have to be
checked for correct tightness and sealing. Consider torques according to manufac-
turer's details. If required, replace the components. Only use components with ap-
propriate Ex approval.
Servicing and maintenance
45