APL-2 Series Limit Switch Box
Installation Operation & Maintenance Manual
Doc No. : HUMG-APL2-16 Rev0 Page 9 / 10 Valve Automation Leader HKC
13 Installation and Maintenance Tips
For any installation and maintenance work, the following should be observed :
Caution :
A regular inspection and maintenance performed by qualified and trained personnel
When working in potentially explosive areas, observe the standard EN 60079-14 “Electrical
Installations in Hazardous Areas”.
Work at the open actuator under voltage must only be performed if it is assured that for the duration of
the work there is no danger of explosion.
Observe additional national regulations.
Ø Check the limit switch box visually. Ensure that no outside damage or changes are visible.
The electric connecting cables must be without damage and wired correctly.
Ø Cable entries, cable glands, plugs etc. have to be checked for correct tightness and sealing.
Ø Check whether enclosure connections are fastened correctly.
Ø Take care of possible discolorations of the terminals and wires.
Ø Check the enclosure gaps whether contaminated dirt and corrosion. Since the dimensions of all enclosure
gaps are strictly defined and inspected, no mechanical work shall be performed on them.
Ø Ensure that all housing covers are handled carefully and that the seals are checked.
Ø All cables have to be checked.
Ø If defects which affect the safety are detected during maintenance, repair measures have to be taken
immediately.
Ø Any kind of coating for the gap surface shall not be permitted.
Ø When exchanging parts, seals etc. only original spare parts shall be used.
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