APL-5 Series Limit Switch Box
Installation Operation & Maintenance Manual
Doc No. : HUMG-APL5-16 Rev0 Page 12 / 13
9. 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. Storage must be off the floor, covered with a sealed dust
protector.
10. Trouble shooting
The following instructions are offered for the most common difficulties encounter during installation
and start-up.
Signal fails to main control room.
① Check the wiring of limit switch box in accordance with wiring diagram.
② Check where the cams or switches are damaged or broken.
③ Check the main signal wire from the terminal strip.
④ Re-set the limit switch box.
⑤ Verify the current position transmitter resistance value.
⑥ Check potentiometer gear jamming.
⑦ Check the zero and span calibration.
⑧ Check the card damaged or not.
11. Tools
① 1 Set Metric Allen Key (Hex Wrench)
② Set Screw Drivers
③ 1 Set Metric Spanner
④ 1 Wire Stripper long Nose
⑤ 1 Needle nose plier
⑥ 1 Multi Meter (AC, DC, Resistance)
⑦ 1 ohm Meter (0~25mA) : if applicable 16 adapted
12. Installation and Maintenance Tips
For any installation and maintenance work, the following should be observed :
Caution :
ü
A regular inspection and maintenance performed by qualified and trained personnel
ü
When working in potentially explosive areas, observe the standard EN 60079-14 “Electrical
Installations in Hazardous Areas”.
ü
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.
ü
Observe additional national regulations.
12.1. 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.
12.2. Cable entries, cable glands, plugs etc. have to be checked for correct tightness and sealing.
12.3. Check whether Ex-connections are fastened correctly.
12.4. Take care of possible discolouration of the terminals and wires.
12.5. Check the flame path gaps of flameproof enclosures for dirt and corrosion. Since the
dimensions of all Ex gaps are strictly defined and inspected, no mechanical work shall be
performed on them.
12.6. Ensure that all housing covers are handled carefully and that the seals are checked.
12.7. All cable has to be checked.
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