APL-4**N Series Limit Switch Box
Installation, Operation & Maintenance Manual
Doc No. : HumG-APL4-21 Rev.1
Page 7 / 12
Valve Automation Leader, HKC
Mechanical switch
Proximity sensor
Splined cam
6.4.
Wiring
Danger ; HAZARDOUS VOLTAGE. No electrical power should be connected until all wiring and
limit switch adjustments have been completely.
6.4.1.
Open circuit before removing cover, and seal required within 450mm (18 inch) of the enclosure by CSA.
6.4.2.
APL limit switch box enclosure feature prewired switches. All user connections are made at a numbered
terminal strip. A wiring diagram, located inside the cover, indicates which terminal numbers correspond to
switch contacts, such as normally open (NO), normally closed (NC), etc. Follow the wiring diagram and
electrical code to connect the switches to your system.
6.4.3.
[The APL-4 limit switch box has two cable entries on the body, and is protected with a sticker to protect it
from moisture and foreign matter penetration. User or installer shall be use cable gland that satisfy the
protection grade and connect them through the cable entries.
6.4.4.
If the cable entry remains after wiring, it must be strictly closed using a suitable blanking plug. The cable
gland must be applied by installer or user. --- 20 r0]
①
Mechanical switch(2 SPDT)
②
Mechanical switch (3 SPDT)
