Compact plastic limit switches with positive opening mechanism
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- Garey Allison
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1 Compact limit switches with positive opening mechanism LJK-N Series Positive opening mechanism Positive opening mechanism meets standards worldwide. A wide variety of actuators is available. The LJK-N conforms to IEC standards, and is certified by UL and CSA. (excluding some models) For equipment and facilities to be exported anywhere in the world, use the LJK-N with confidence. Positive opening mechanism forces contacts open.* Can prevent problems caused by contact fusing. Can be used also as a safety limit switch. Wide variety, with 33 catalog listings in the lineup Actuators: 11 types Contact configuration : : N.C. x + N.O. x 1 (BBM: break before make), N.C. x *Except for the steel wire and spring rod types. CATALOG LISTING Type of actuator Internal switch mechanism Contact configuration Catalog listing Resin roller lever Resin adjustable roller lever 50 mm dia. resin roller lever 50 mm dia. resin adjustable roller lever Plunger Resin roller plunger Resin cross roller plunger Resin one-way roller (horizontal) Resin one-way roller (vertical) Steel wire Spring rod BBM BBM BBM BBM BBM BBM BBM BBM BBM BBM BBM N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x N.C. x LJK-N118F1 LJK-N518F1 LJK-N718F1 LJK-N145F1 LJK-N545F1 LJK-N745F1 LJK-N139F1 LJK-N539F1 LJK-N739F1 LJK-N149F1 LJK-N549F1 LJK-N749F1 LJK-N110F1 LJK-N510F1 LJK-N710F1 LJK-N10F1 LJK-N50F1 LJK-N70F1 LJK-N103F1 LJK-N503F1 LJK-N703F1 LJK-N11F1 LJK-N51F1 LJK-N71F1 LJK-N17F1 LJK-N57F1 LJK-N77F1 LJK-N106F1 LJK-N506F1 LJK-N706F1 LJK-N108F1 LJK-N508F1 LJK-N708F1 1
2 INTERNAL SWITCH Snap-action type Slow-action BBM type The slow action internal switch has N.C./N.O. electrically independent contacts (form Zb). The positive opening mechanism forces the contacts open (N.C. contacts only) even if they are fused. As seen above, the cam forces the N.C. contact up from the bottom, even if there is fusing of the contacts. Note: Steel wire and spring rod types do not have positive opening mechanism. SPECIFICATIONS Standards Compliance Certification Protective structure Electrical shock protection Structure Pollution degree Internal switch Electrical rating Insulation resistance Initial contact resistance Electrical Rated thermal current (Ith) performance Short-circuit protection Rated insulation voltage (Ui) Rated conditional short-circuit current Rated impulse withstand voltage (Uimp) Impact resistance Mechanical performance Vibration resistance Max. operating speed and min. operating speed Mechanical life Life Electrical life Operating temperature Environment Operating humidity Storage temperature Conduit Recommended tightening torque Product-related: IEC , and EN Machine-related: IEC and EN UL 508, CSA C. No. 14 IP65 (IEC 6059, JIS C 090) Class II (IEC 61140) 3 LJK-N1 F1: snap action, LJK-N5 F1 and LJK-N7 F1: slow action (See Table 1.) 100 MΩ or more between terminals with the same polarity and between each terminal and non-live metal part (by DC500 megger) 5 mω or less (6 to 8 Vdc, thermal current 1A, measured by voltage drop method) 10A 10A breaking fuse, gg (gl) type 500V (IEC ), 0V (UL 508, CSA C. No. 14) 1,000A 6,000V Durability: 500 m/s Note: 50 mm dia. resin adjustable roller lever types 0 m/s spring rod types 00 m/s IEC m/s (10 to 500 Hz), IEC (See Table.) 10 million operations : 0000 operations, : operations 5 to +7C (without freezing) Max. 98% RH 40 to +7C G 1/ Body: 0.5 to 0.7 N m (M4) Head: 0.8 to 1. N m (M3 round head screw) Cover: 0.8 to 1. N m (M3 round head screw) Terminal: 0.8 to 1. N m (M3.5 round head screw) Lever: 1.3 to 1.7 N m (M4 round head screw) Table 1. Electrical rating AC-: A0 (Ue=40V, Ie=3A) DC-13: R0 (Ue=50V, Ie=0.1A) Table. Max. operating speed and min. operating speed Actuator Contact configuration Utilization categories AC-: solenoid load DC-13: solenoid load Ue: rated operating voltage Ie: rated operating current Actuator Contact configuration LJK-N1 F1 LJK-N5 F1 LJK-N7 F1 Roller lever type Plunger type One-way roller / non-directional operation types LJK-N 18F1 LJK-N 10F1 LJK-N 1F1 LJK-N 39F1 LJK-N 0F1 LJK-N 7F1 LJK-N 45F1 LJK-N 03F1 LJK-N 06F1 LJK-N 49F1 LJK-N 08F1 Min. speed Max. speed Min. speed Max. speed Min. speed Max. speed 0.03 m/min 1.5 m/s 18 m/min 1.5 m/s 18 m/min 1.5 m/s 0.01 m/min 0.5 m/s 0.0 m/min 6 m/min 0.5 m/s 1 m/min 6 m/min 0.5 m/s 1 m/min 1 m/s 1 m/s 1 m/s
3 OPERATING CHARACTERISTICS BY ROTARY OR IN-LINE ACTUATIONS OF ACTUATORS O.F.: max. operating force needed for N.C. operation Roller lever type Free position Plunger type and one-way roller type P.O.F: min. force for positive opening Non-directional operation type TT PO PT PT TT PO PT PO TT PT PT T.T.: total travel. P.T.1: pretravel for N.C. operation. P.T.: pretravel for N.O. operation. M.D.: minimum movement differential. P.O.: minimum travel to positive opening position. SHAPE / DIMENSIONS / OPERATING CHARACTERISTICS / CIRCUIT DIAGRAMS Resin roller lever: LJK-N118F1, LJK-N518F1, LJK-N718F1 3 Roller: 19 dia. x 5.5 width, Roller lever can also be mounted on the opposite side. by lever rotational angle PT (pretravel for N.O. operation) LJK-N118F1 LJK-N518F1 LJK-N718F1 5 (5 ) (16 ) (7) 47 (8 ) (38 ) (7) 41 (7 ) (7) Catalog listing by dog operation Circuit diagram (108.1) () LJK-N118F1 LJK-N518F1 5 5(P) (P) G 1/ 5 37 LJK-N718F (P)
4 Resin adjustable roller lever: LJK-N145F1, LJK-N545F1, LJK-N745F1 3 (108 to 7) Roller: 19 dia. x 5.5 width, (53.5 to 10.5) (35.5 to 84.5) R6 to Roller lever can also be mounted on the opposite side. by lever rotational angle PT (pretravel for N.O. operation) LJK-N145F1 LJK-N545F1 LJK-N745F1 5 (5 ) (16 ) (7) 47 (8 ) (38 ) (7) 41 (7 ) (7) Catalog listing by dog operation Circuit diagram 5 5(P) LJK-N145F () 81.6 LJK-N545F (P) G 1/ 39.7 LJK-N745F (P) mm dia. resin roller lever: LJK-N139F1, LJK-N539F1, LJK-N739F1 3 (73) Roller: 50 dia. x 10 width, (.5) 47 4 by lever rotational angle PT (pretravel for N.O. operation) LJK-N139F1 LJK-N539F1 LJK-N739F1 5 (5 ) (16 ) (7) 47 (8 ) (38 ) (7) 41 (7 ) (7) (16) 18 () 81.5 Catalog listing by dog operation Circuit diagram 5 5(P) LJK-N139F (P) LJK-N539F G1/ 5 37 LJK-N739F (P)
5 50 mm dia. resin adjustable roller lever: LJK-N149F1, LJK-N549F1, LJK-N749F1 3 Roller: 50 dia. x 10 width, (13.5 to 17.5) (78 to 118) (60 to 100) R. R. R35 to 75 () Roller lever can also be mounted on the opposite side by lever rotational angle PT (pretravel for N.O. operation) Catalog listing by dog operation Circuit diagram 5 5(P) LJK-N149F LJK-N549F1 LJK-N149F1 LJK-N549F1 LJK-N749F1 5 (5 ) (16 ) (7) (P) 7 47 (8 ) (38 ) (7) 41 (7 ) (7) 0 5 G1/ 39.7 LJK-N749F (P) Plunger: LJK-N110F1, LJK-N510F1, LJK-N710F1 by vertical operation PT (pretravel for N.O. operation) LJK-N110F1 LJK-N510F1 LJK-N710F1 N 4.5 mm N (.5 mm) (1.4 mm) N 4. mm N (.8 mm) (4.0 mm) N 4.1 mm N (.7 mm) Plunger: 8 dia. Steel Catalog listing by vertical operation Circuit diagram.5 4.5(P) LJK-N110F mm (75) () LJK-N510F (P) 5.5mm 0 G 1/ 5 LJK-N710F (P) mm 5
6 Resin roller plunger: LJK-N10F1, LJK-N50F1, LJK-N70F1 Roller: 11 dia. x 3.5 width, 1.5 by vertical operation PT (pretravel for N.O. operation) LJK-N10F1 LJK-N50F1 LJK-N70F1 N 4.5 mm N (.5 mm) (1.4 mm) N 4. mm N (.8 mm) (4.0 mm) N 4.1 mm N (.7 mm) () Catalog listing by vertical operation Circuit diagram.5 4.5(P) LJK-N10F1 1.4 LJK-N50F (P) 0 G 1/ 5 LJK-N70F (P) 1 11 Resin cross roller plunger: LJK-N103F1, LJK-N503F1, LJK-N703F1 Roller: 11 dia. x 3.5 width, 1.5 by vertical operation PT (pretravel for N.O. operation) LJK-N103F1 LJK-N503F1 LJK-N703F1 N 4.5 mm N (.5 mm) (1.4 mm) N 4. mm N (.8 mm) (4.0 mm) N 4.1 mm N (.7 mm) Catalog listing by vertical operation Circuit diagram.5 5 LJK-N103F (P) () LJK-N503F (P) 0 5 G 1/ LJK-N703F (P)
7 Resin one-way roller (horizontal): LJK-N11F1, LJK-N51F1, LJK-N71F1 3 (93.7) Roller: 14 dia. x 5.5 width, (39.) R18 () by dog operation PT (pretravel for N.O. operation) LJK-N11F1 LJK-N51F1 LJK-N71F1.9 mm (9 mm) (5. mm) 14.9 mm (10 mm) (14.1 mm) 14.6 mm (9.6 mm) Catalog listing by dog operation Circuit diagram 9.9(P) LJK-N11F1 5. mm LJK-N51F (P) 14.1 mm 0 G 1/ 5 LJK-N71F (P) 1 11 Resin one-way roller (vertical): LJK-N17F1, LJK-N57F1, LJK-N77F1 3 Roller: 14 dia. x 5.5 width, by dog operation PT (pretravel for N.O. operation) LJK-N17F1 LJK-N57F1 LJK-N77F1.9 mm (9 mm) (5. mm) 14.9 mm (10 mm) (14.1 mm) 14.6 mm (9.6 mm) R18 Catalog listing by dog operation Circuit diagram (41) 19 LJK-N17F1 9.9(P) 5. mm (95.5) () LJK-N57F (P) 14.1 mm 0 G 1/ 5 (1.5) LJK-N77F (P)
8 Steel wire: LJK-N106F1, LJK-N506F1, LJK-N706F1 Note: Steel wire switches do not have positive opening mechanism dia. by wire inclination angle PT (pretravel for N.O. operation) LJK-N106F1 LJK-N506F1 LJK-N706F1 (5 ) ( ) (8 ) (4) (7 ) Catalog listing by dog operation Circuit diagram 5 LJK-N106F1 () 69 LJK-N506F G 1/ LJK-N706F1 Spring rod: LJK-N108F1, LJK-N508F1, LJK-N708F1 Note: Steel wire switches do not have positive opening mechanism. 6.4 dia. by rod inclination angle PT (pretravel for N.O. operation) LJK-N108F1 LJK-N508F1 LJK-N708F1 (5 ) ( ) (8 ) (4) (7 ) 18 Catalog listing by dog operation Circuit diagram 18.5 LJK-N108F1 5 () 69 LJK-N508F G 1/ LJK-N708F1 8
9 HANDLING PRECAUTIONS 1. Mounting the switch Always tighten each part of the safety switch to the tightening torque recommended in the product specifications. If any part is tightened excessively, the screw and/or other parts may be damaged. Mount the dog so that no force is directly applied to the actuator in the free state. Do not use any glue or lubricant containing silicone. Doing so might result in faulty electrical conductivity.. Wiring Do not perform wiring work with the power turned ON. Doing so might cause an electrical shock or cause the device to operate suddenly. 3. Adjustment Do not apply excessive force (force 5 times larger that the O.F.) to the actuator when it is beyond the operation limit position. Doing so might break the switch. Adjust the actuator motion so that it exceeds the specified P.O. (travel to positive opening position) but does not exceed the operation limit position. 4. Operating environment Do not use in a location subject to splashing with strong acid or alkali. Before use, thoroughly read the Precautions for use and Precautions for handling in the Technical Guide on pages D-111 to D-1 as well as the instruction manual and product specification for this switch. 9
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