APL-9 Series Limit Switch Box
Installation Operation & Maintenance Manual
Doc No. : HumG-APL9-21 Rev0
Page 8 / 10
Valve Automation Leader HKC
Note ;
Grounding should be connected until all wiring has been completely.
Wire square for the internal grounding shall be recommended min.2SQ recommended.
Wire square for the external grounding shall be recommended min.4SQ recommended.
Optional wiring diagrams will be provided separately.
8.
Maintenance
Caution :
Shut off incoming power or air supply on the valve actuator before maintenance limit switch box.
Be sure that the area is clean before disassemble and maintenance limit switch box. Clean all parts and
housing before re-assemble.
Refers to the part list when ordering replacement or spare parts.
Maintenance, under normal conditions at six month intervals or 100,000 cycle operation. But when conditions
are more severe, more frequent inspections may be required.
8.1.
Ensure valve actuator alignment
8.2.
Ensure wiring is insulated, connected and terminated properly
8.3.
Ensure all screws are present and tight
8.4.
Ensure
cleanliness of internal electrical devices
8.5.
Ensure conduit connections are installed properly and are dry
8.6.
Check internal devices for condensation
8.7.
Check enclosure seals and verify that the gasket is not pinched between housing
8.8.
Visually inspect during open/close cycle
Warning :
Treat cover with care. Gap surface must not be damaged or dirtied in any way
9.
Inspection
9.1.
The limit switch box should be inspected upon receipt to ensure that no damage has been sustained on
transit.
9.2.
Check the item and quantity of products with packing list or related documents.
9.3.
Check the limit switch box gasket. Where a damage on it. It caused the corrosion of internal parts.
9.4.
Check the adjustment of cams. Cams shall be released when those have been used for a long period of
operating. If do so, they don’t work correctly with switches.
10.
Storage
The products must be stored in a clean, cool and dry area. The unit shall be stored with the cover installed and
the cable entry openings sealed. Storage must be off the floor, covered with a sealed dust protector.
11.
Trouble Shooting
The following instructions are offered for the most common difficulties encounter during installation and start-
up.
Signal fails to main control room.
11.1.
Check the wiring of limit switch box in accordance with wiring diagram.
11.2.
Check where the cams or switches are damaged or broken.