APL-4**N Series Limit Switch Box
Installation, Operation & Maintenance Manual
Doc No. : HumG-APL4-21 Rev.1
Page 5 / 12
Valve Automation Leader, HKC
⑤
When cable entries or conduit entries are not used, user or installer shall close by certified blanking
elements(stopping plugs) so that the flameproof properties of the enclosure are maintained.
4.2.2.
Groundings
①
Always ground the enclosure in accordance with local electric codes. The most effective enclosure
grounding method is a direct connection to earth ground with minimal impedance. Methods for
grounding the enclosure include:
Internal ground connection : The internal ground is located inside the body .
External ground connection : The ground bracket is located on the side of body.
(Min 2SQ wire required)
4.2.3.
Special Condition for safe use (“X” marking)
①
Electrostatic discharge from window(over 1GΩ) may cause the ignition on the explosive gas atmosphere.
By adapting the conducting window bolts make reduce the risk from electrostatic discharge.
②
Before installation or maintenance products, shut off incoming power and grounding should be
connected.
③
The window must only be cleaned with a damp cloth in order to avoid ignition hazard caused by static
electricity.
4.3.
Initial inspection
4.3.1.
When the user receipts the product, inspect the condition of the product and ensure the name plate
comparing with order sheet.
4.3.2.
Remove packing wrap or wooden box carefully. Inspect the product for any physical damage that may
have occurred during shipment.
4.3.3.
Check the product specification with product ordered. If a wrong product has been shipped,
immediately notify our coordinator.
5. Standard Features
No.
Part Name
Q’ty
Description
1
Window / Indicator
1
PC / ABS
2
Cover
1
Aluminium Die casting (ADC12)
3
Captive cover bolt
4
Stainless steel
4
Name plate
1
Stainless steel (A240 T304)
5
Shaft
1
Stainless steel (G4303 SUS303)
6
Cam
2
PC
7
Switch
2
Refer to the clause “2. Ordering Information-② Switch type”
8
Body
1
Aluminium Die casting (ADC12)
9
Terminal strip
1
8P (9~14P available)
10
Earth lug
2
Stainless steel
11
Blanking element
2
[Sticker---19 r0] If required by customer, optionally used Exp type plug
6.
Installation
6.1.
Mounting bracket
Caution ; Where limit switch box or one of parts are to be moved, installed, disassembled,
reassembled by a hand, care must not be taken to cause injury by the harmful sharp edges of corners
or rough surfaces or residual electricity.
4
2
3
1
5
9
10
7
6
11
8