APL-5 Series Limit Switch Box
Installation Operation & Maintenance Manual
Doc No. : HUMG-APL5-16 Rev0 Page 11 / 13
6.5.3. Calibration Potentiometer
① Apply power or air to the actuator to operate fully closed position
② Connect an ohm meter to P1 and P3 resistances, the values shall be approximately 1kΩ.
③ Loosen the shaft gear and connect the ohm meter to P1 and P3 and gently rotate until 80
~ 120 ohm is achieved (100ohm preferred). While maintaining the value, tighten a lock
screw with a hex wrench.
6.5.4. Calibration Zero Span
Zero span setting has been calibrated by manufacturer. However if re-calibration is
required
① Operate a actuator to 50% position and then fully closed position.
② When the actuator is in the fully closed position, adjust the “zero” button on the card until
a value of 20mA is achieved.
7. 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.
- Refer to the part list when ordering replacement or spare parts.
7.1. Maintenance, under normal conditions at six month intervals or 10,000 cycle operation.
But when conditions are more severe, more frequent inspections may be required.
7.1.1. Insure valve actuator alignment
7.1.2. Insure wiring is insulated, connected and terminated properly
7.1.3. Insure all screws are present and tight
7.1.4. Insure cleanliness of internal electrical devices
7.1.5. Insure conduit connections are installed properly and are dry
7.1.6. Check internal devices for condensation
7.1.7. Check enclosure O rings seals and verify that the O ring is not pinched between housing
7.1.8. Visually inspect during open/close cycle
7.1.9. Inspect identification labels for ware and replace if necessary
Warning ;
Flameproof enclosure! Before opening, ensure the absence of gas, dust and voltage.
Treat cover with care. Gap surfaces must not be damaged or dirtied in any way.
8. Inspection
8.1. The limit switch box should be inspected upon receipt to ensure that no damage has been
sustained on transit.
8.2. Check the item and quantity of products with packing list or related documents.
8.3. Check the limit switch box o-ring. Where damage on it, it caused the corrosion of internal parts.
8.4. 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.
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