General Maintenance Work - SMA NA-BOX 12 Operating Manual

10 Maintenance
10.4

General Maintenance Work

The general maintenance work must be performed every twelve months.
Danger to life due to electric shock when live components or cables are touched
High voltages are present in the conductive components or cables of the product. Touching live parts and cables
results in death or lethal injuries due to electric shock.
• Do not touch non-insulated parts or cables.
• Disconnect the product from voltage sources and make sure it cannot be reconnected before working on the
device.
• Only disassemble the protective covers, if the product is disconnected from all voltage sources.
• Wear suitable personal protective equipment for all work on the product.
Damage due to cleaning agents
The use of cleaning agents may cause damage to the product and its components.
• Clean the product and all its components only with a cloth moistened with clear water.
Adverse ambient conditions reduce maintenance intervals
Location and ambient conditions influence the maintenance intervals. Note that cleaning and corrosion protection
may be required more frequently depending on the conditions at the installation site.
• If the product is subject to adverse ambient conditions, a reduction of the maintenance intervals is
recommended. Above all, the intervals between cleaning work and corrosion protection should be reduced.
• SMA recommends a monthly optical inspection to determine the maintenance requirement.
Required maintenance materials and tools
Only those consumables and maintenance materials not normally included in the standard equipment of an electrically
qualified person are listed. It is taken for granted that standard tools and materials such as torque wrenches, one-
contact voltage testers and wrenches will be available for all maintenance operations.
☐ To repair minor surface corrosion damage: touch-up sticks, paint brushes, spray paint or, alternatively, 2K-PUR
acrylic paint (RAL-Farbe: 7035)
☐ To repair large-surface corrosion damage: touch-up sticks or, alternatively, 2K-PUR acrylic paint (RAL color: 7035)
☐ Abrasive cloth
☐ Degreaser
☐ For maintaining the seals: talcum, petroleum jelly or wax
Procedure:
1. Check whether the inside of the product is soiled or moist.
2. If the interior of the product is dirty, clean the product.
3. If the interior of the product is moist or water has accumulated, dry the product out.
4. Check whether all connections have been tightened with the correct torque (see Section 12, page 35)
5. If any connections are not tightened with the correct torque, tighten with a suitable torque wrench.
6. Check all power cables on the product for discoloration or changes in the appearance of the insulation.
7. If any power cables are discolored or the appearance of the insulation has changed, replace these power cables.
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