APL-9 SERIES
Stainless Steel Limit Switch
Installation & Maintenance Manual
8
May 16, 2016
www.atcontrols.com
Iom08074
5.
Maintenance
Caution: Shut off incoming power and air supply on the valve actuator before maintenance of
limit switch box.
Be sure that the area is clean before disassembly and maintenance of limit switch box.
Clean all parts and housing before reassembly.
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Refer to the part list when ordering replacement or spare parts.
5.1. Maintenance, under normal conditions at six-month intervals or 100,000 cycle operation.
When conditions are more severe, more frequent inspections may be required.
①
Ensure valve actuator alignment
②
Ensure wiring is insulated, connected and terminated properly
③
Ensure all screws are present and tight
④
Ensure cleanliness of internal electrical devices
⑤
Ensure conduit connections are installed properly and are dry
⑥
Check internal devices for condensation
⑦
Check enclosure O rings seals and verify that the O ring is not pinched between housing
⑧
Visually inspect during open/close cycle
⑨
Inspect identification labels for wear and replace if necessary
Warning;
Treat cover with care. Mating surfaces must not be damaged in any way.
6.
Inspection
6.1. The limit switch box should be inspected upon receipt to ensure that no damage has been sustained
on transit.
6.2. Check the item and quantity of products with packing list or related documents.
6.3. Check the limit switch box o-ring. Damage to it can cause the corrosion of internal parts.
6.4. Check the adjustment of cams and make sure they are securely held on the shaft gear.
7.
Storage
The products must be stored in a clean, cool and dry area. The unit shall be stored with the cover installed
and the conduit openings sealed with metal plugs. Storage must be off the floor, covered with a sealed
dust protector.
8.
Trouble shooting
The following instructions are offered for the most common difficulties encountered during installation and
start-up.
Signal fails to main control room.
①
Check wiring of limit switch box is in accordance with wiring diagram.
②
Check if the cams or switches are damaged or broken.
③
Check the main signal wire from the terminal strip.
④
Check if the cams are set properly.
⑤
Adjust mounting of the limit switch box.
