Limit Switches

Limit Switches 0607

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Matsushita Electric Works, Ltd.

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Automation Controls Business Unit Head Office: 1048, Kadoma, Kadoma-shi, Osaka 571-8686, Japan Telephone: +81-6-6908-1050 Facsimile: +81-6-6908-5781 http://www.nais-e.com/
All Rights Reserved 2006 COPYRIGHT Matsushita Electric Works, Ltd.
ARCT1B272E 200609-1YT Specifications are subject to change without notice. Printed in Japan.
CTi Automation - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
SUBMINIATURE SIZE LIMIT SWITCHES
SL (AZ3) Micro Limit Switches
6. Long life By combining the excellent reliability and solvent proofing of the FS-T microswitch with the L shape spring, we have achieved a unit with both long life and high reliability (electrical life: 105 mechanical life: 107 7. Built-in safety features and excellent environment proofing The case uses 66 nylon glass fiber the doubly protect the switch. Also, the body and cap have been ultrasonically welded, creating a flush construction except for the terminals. Moreover, by adding a dedicated socket, the construction is drip-proof, dust-proof, and dirt-proof, creating a flush construction for the unit as a whole including the terminals. Rubber cover type: Equivalent to IP60 Socket with cord type: Equivalent to IP64
Quickly upgraded to limit switches with lamps by mounting an LED lamp socket.
2. A lamp can be easily added for operations checks An exposed terminal type model combined with a socket with cord for the built-in LED lamp (sold separately) easily become a limit switch with lamp. Convenient for maintenance checks such as operations checks.

LED lamp

SL exposed terminal type
Socket with LED lamp SL limit with lamp
Rubber cover type (roller lever)
RoHS Directive compatibility information http://www.nais-e.com/

FEATURES

1. Subminiature limit switch Managed to miniaturize the comparative bulk with high density mountings in the equipments detector to approximately 1/3 of our own ML limit switches, or approximately 1/1.6 of the Z model microswitch.

Approx. 1/3

3. Operates with a light force Comes in two types: O.F. is a maximum of 1.18N {120gf} (light force model) and light force commensurate to the microswitch. 4. Terminal uses both solder and tab (#110) 5. Achieves stroke tolerance (O.T./T.T.) of 0.67 Plenty of scope for position fixing with long life. Because of the optimum design of the built-in limit switch and the original Lmodel spring for use in O.T. absorption, the total travel range has been enlarged, and both position fixing and the units lifespan have been improved a level. Stroke range: 3 times more than the ML limit

TYPICAL APPLICATIONS

Dust proofing and oil resistance requirement.

PRODUCT TYPE

1. Switch body
Actuator Hinge lever Operating Force (O.F.) 1.18N {120gf} 1.96N {200gf} 1.18N {120gf} 1.96N {200gf} 1.96N {200gf} 2.94N {300gf} 2.94N {300gf} 2.94N {300gf} Exposed terminal type AZ3012 AZ3022 AZ3013 AZ3023 AZ3024 AZ3025 AZ3026 AZ3027 Rubber cover type AZ3512 AZ3522 AZ3513 AZ3523 AZ3524 AZ3525 AZ3526 AZ3527 Socket with cord type* AZ3712 AZ3722 AZ3713 AZ3723 AZ3724 AZ3725 AZ3726 AZ3727
Roller lever One-way roller lever Hinge short lever Short roller lever One-way short roller lever
Notes) 1. Socket with cord type is combination of; Exposed terminal type + Socket with cord (cord length: 1m 3.281ft.) 2. UL reconized, CSA certified type available. (See page 14.)

2. Socket

Applicable limit switches Specifications L socket Socket with cord (1 m 3.281ft.) Exposed terminal types Socket with cord (2 m 6.562ft.) Socket with cord (3 m 9.843ft.) Socket with cord (5 m 16.404ft.) Part No. AZ3806 AZ3807 AZ3827 AZ3837 AZ3857

SL (AZ3)

3. Socket with LED (cord length: 1m 3.281ft.)
Applicable limit switches Lamp Connection Normally open (N.O.) connection Expoced terminal types Normally closed (N.C.) connection Notes) 1. Types with 24 to 48V DC lamp rating are recommended for PC input use. 2. The following cord lengths are also available and lot-produced upon request. Cord length 2m 3m 5m Part No. AZ76 AZ76 AZ76 The 5th digit (boxed) of part number denotes the length of cord. Numerals come in the asterisked () digits, which show the lamp specifications. The 7th digit: 1: N.O. connection, 3: N.C. connection The 9th: None: 24 to 48V DC, 1: 12V DC, 2: 6V DC Lamp rating 6V DC 12V DC 24 to 48V DC 6V DC 12V DC 24 to 48V DC Part No. AZ3807162 AZ3807161 AZ380716 AZ3807362 AZ3807361 AZ380736

FOREIGN STANDARDS

Standards UL recognized product Applicable product File No.: E122222 Ratings: 105 rating 4A, 250V AC Product type: All products File No.: LR55880 Ratings: 105 rating 4A, 250V AC Product type: All products excluding types with socket and cord. Part No.
Add 9 to the end of the part No.

CSA certified product

SPECIFICATIONS

1. Rating

Rated control voltage Resistive load (cos ]1) Inductive load (cos ]0.4) 125V AC 4A 2.5A 250V AC 4A 2.5A 30V DC 4A 2.5A 125V DC 0.1A 0.1A

2. Characteristics

Contact arrangement Initial contact resistance, max. Contact material Initial insulation resistance (At 500V DC) Initial breakdown voltage Between non-consective terminals Between dead metal parts and each terminal Between ground and each terminal Mechanical Electrical 1 From C 60 m (By voltage drop 5 to 6V DC 1A) AgNi contact Min. 100M 1000 Vrms for 1 min 1500 Vrms for 1 min 1500 Vrms for 1 min 107 (at 60 cpm) 105 (at 20 cpm, 4A 250V AC resistive) 20 to +60C -4 to +140F Max. 95% R.H. 120 cpm
Expected life (min. operations) Ambient temperature Ambient humidity Max. operating speed
3. Mechanical characteristics
Actuator Hinge lever Roller lever 1.96N {200gf} 196m/s2 {20G} 294m/s2 {30G} 10 to 55Hz 1.5mm.059inch One-way roller lever 1.96N {200gf} 147m/s2 {15G} 294m/s2 {30G} 10 to 45Hz 1.0mm.039inch Hinge short lever 2.94N {300gf} 294m/s2 {30G} 294m/s2 {30G} 10 to 55Hz 1.5mm.059inch Short roller lever 2.94N {300gf} 196m/s2 {20G} 294m/s2 {30G} 10 to 55Hz 1.5mm.059inch One-way short roller lever 2.94N {300gf} 147m/s2 {15G} 294m/s2 {30G} 10 to 55Hz 1.5mm.059inch
Operating Force (O.F.) 1.18N {120gf} 1.96N {200gf} 1.18N {120gf} 98m/s2 {10G} 294m/s2 {30G} 98m/s2 {10G} Shock resis- In the free position tance, min. In the full operating position 294m/s2 {30G} 294m/s2 {30G} 294m/s2 {30G} Vibration rate 10 to 55Hz 10 to 45Hz Vibration resistance Double amplitude 1.5mm.059inch 1.0mm.039inch
4. Operating characteristics
Characteristics Actuator Hinge lever Roller lever One-way roller lever Hinge short lever Short roller lever One-way short roller lever O.F.(N{gf}) max. 1.18 {120} 1.96 {200} 1.18 {120} 1.96 {200} 1.96 {200} 2.94 {300} 2.94 {300} 2.94 {300} R.F. (N{gf}) min. 0.24 {25} 0.49 {50} 0.24 {25} 0.49 {50} 0.49 {50} 0.59 {60} 0.59 {60} 0.59 {60} Movement Overtravel Pretravel (P.T.), (O.T.), Differential (M.D.), max. mm inch max. mm inch min. mm inch 3.0.118 1.5.059 6.0.236 3.0.118 1.5.059 6.0.236 3.0.118 1.5.059 6.0.236 2.0.079 1.0.039 3.5.138 2.0.079 1.0.039 3.5.138 2.0.079 1.0.039 3.5.138 Operating Position (O.P.) mm inch 16.71.5.657.059 30.71.5 1.209.059 40.51.5 1.594.059 13.71.5.539.059 27.71.5 1.091.059 36.71.5 1.445.059
Note) For the operating characteristics, refer to the TECHNICAL INFORMATION.
5. Protective characteristics

Protective construction IEC IP60 IP62 IP63 IP64 Rubber cover type Types with socket and cord

6. LED rating

Rated operating voltage 6V DC 12V DC 24 to 48V DC Operating voltage range 5 to 15V DC 9 to 28V DC 20 to 55V DC Internal resistance 2.4K 4.7K 15K

1. Life curve

1,000 Resistive load 250V AC No. of operations ()401

WIRING DIAGRAMS

2.Actual load life curve

No. of operations ()401

0.NK HC

50 HP HG FC-10 VC 20

FC-35 FC-100

Various relay loads (VA)

Load current (A)
Note: The FC magnetic contactor series is 200V AC. The NK is 2 Form C 24V DC type.

DIMENSIONS

1. Rubber cover Hinge lever
(PT) 3 max.2.402 19.7 27.776 1.063 4.30.1 dia. OP 16.71.5.169.mounting.657.059 hole.315 15.591 280.2 1.102.1.457 5.197 24.5.965 8.315 16.630 7.276

mm inch

Roller lever

AZ3513 AZ3523

(PT) 3 max.118 33.7 1.327 OP 4.30.1 dia. 30.71.5.169.004 1.209.mounting.315 hole

15.591

4.157 24.1.949 140.2.551.008 4.50.1 dia.177.004 mounting hole

12.4.488

57 2.244
12.5 8dia.492 513.dia. glass fiber reinforced nylon 66 roller
4.157 24.1.949 140.2.551.008 NO(3) M3 fastening screw 3-tab (#110) terminals (t=0.5) 4.50.1 dia.177.004 mounting hole

27 1.063

AZ3512 AZ3522
NC(2) When rubber cover is removed, teminal details are shown. COM(1)
15.591 280.2 1.102.1.457 5.197 24.5.965 8.315 16.630
General tolerance: 0.4.016

One-way roller lever

Hinge short lever
57 2.244 flection cket de90 Bra angle 25.984

(PT) 3 max.118

15.4.606 12.4.488
12.5 8dia.492 513.dia. glass fiber reinforced nylon 66 roller 4.157 24.1.949 140.2.551.008 4.50.1 dia.177.004 mounting hole

40 1.575

4.157 24.1.949

AZ3524

140.2.551.008 4.50.1 dia.177.004 mounting hole
43.5 1.713 OP 40.51.5 4.30.1 dia. 1.594.059.169.mounting hole.315 15.591

AZ3525

16.630

280.2 1.102.1.457

5.197 24.5.965
27 1.063 280.2 1.102.1.457
2 max. (P.T.).079 F.P. (15.7) 4.30.1 dia. O.P. (.618).169.mounting hole.315 13.71.5.539.059 8.315 15.591 5.197 24.5.965

Short roller lever

AZ3526
One-way short roller lever

AZ3527

36 1.417
2 max. (P.T.).079 (29.7) (1.169) (O.P.) 27.71.5 4.30.1 dia. 1.091.059.169.mounting hole.315 8.315
36 1.417 ion deflect 25 Bracket e 90 angl.984 4.157
2max. P.T.079 (39.5) (1.555) (O.P.) 36.71.5 1.445.059 4.30.1 dia.169.mounting hole.315 8.315
24.1.949 140.2.551.008 4.50.1 dia.177.004 mounting hole

15.591 5.197 24.5.965

2. Exposed terminal type Hinge lever 3. Socket with cord type One-way roller lever

AZ3724 mm inch

4.157 24.1.949 140.2.551.008

61 2.402

3max. (PT).118
57 2.244 ion deflect Bracket e 90 angl

AZ3012 AZ3022

4.50.1 dia.177.004 mounting hole
OP 16.71.5 19.7 8.657.059.776.315 4.30.1 dia.169.004 mounting hole 3-tab (#110) terminals (t=0.5) 8 5.315.197 8.7.343
3 5.197 24.1.949 140.2.551.008 4.50.1 dia.177.004 mounting hole 4.157

25.984

27 1.063 8.315

10.394 16.630

43.5 1.713 OP 40.51.5 1.594.059 4.30.1 dia.169.004 mounting hole Vinyl cabtire cord (VCTF) 0.75E3 wire M3 mounting screw 14.8.583 16.630 8.7.343 23.906 8.315 Black: COM Red: NC White: NO
Note) The following types are also available. Roller lever: AZ3013, AZ3023 One-way roller lever: AZ3024 Hinge short lever: AZ3025 Short roller lever: AZ3026 One-way short roller lever: AZ3027
5.197 17.0.669 Approx. 1000 39.370
(Combination of the AZ3024 exposed terminal type and the AZ3807 socket with cord type) Note) The following types are also available. Hinge lever: AZ3712, AZ3722 Roller lever: AZ3713, AZ3723 Hinge short lever: AZ3725 Short roller lever: AZ3726 One-way short roller lever: AZ3727
CONNECTION METHOD FOR RUBBER COVER
1) Remove the rubber cover from the limit switch. 3) Connect lead wire to the receptacle terminals (#110) with insulating sleeve provided and insert it into the terminal of limt switch. (The lead wire can directly be soldered to the terminals without using receptacle terminals) 4) Push the rubber cover securely over the terminals.
2) After stripping the sheath from the appropriate cord (refer to table on the right) and removing the covering of the lead wires, insert the cord into the rubber cover.

Wire name

Conductor Wire strand
2 Vinyl cabtire 0.75mm cord (VCTF) 0.75mm2
Applicable wire Finished outside diameter 2-wire 6.6mm.260inch dia. 3-wire 7.0mm.276inch dia.

CAUTIONS

1. Ambient conditions 1) The use of these switches under the following conditions should be avoided. If the following conditions should become necessary, we recommend consulting us first. Use where there will be direct con tact with organic solvents, strong acids or alkalis, or direct exposure to their vapors. Use where inflammable or corrosive gases exist. Because these switches are not of water resistant or immersion-proof construction, their use in water or oil should be avoided. Also, locations where water or oil can normally impringe upon the switch or where there is an excessive accumulation of dust should be avoided. 2) To improve reliability during actual use, it is recommended that the operation be checked under installation conditions. 3) If OT is too big, the life of limit switch will be shortened switching friction. Use it with enough margin of OT. 70% of OT standard value will be good for use. 4) Do not use the switch in a silicon atmosphere. Case should be taken where organic silicon rubber, adhesive, sealing material, oil, grease or lead wire generates silicon. 5) Avoid use in excessively dusty environments where actuator operation would be hindered. 6) When used outdoors (in places where there is exposure to direct sunlight or rain such as in multistory car parks) or in environments where ozone is generated, the influence of these environments may cause deterioration of the rubber material. Please consult us if you intend to use a switch in environments such as these. 2. Mounting and wiring 1) Although SL limit switches have large over-travel (O.T.), excessive O.T. will occur wear and change in its characteristics. Specifically, where there is a need for long life, it is recommended that the proper O.T. as given below should be used. Specifically, where there is a need for long life, it is recommended that the proper O.T. as given below should be used. Within 1 to 3mm.039 to.118inch 2) When the operating object is in the free condition, force should not be applied directly to the actuator. 3) Use their own accessories when mounting and wiring SL limit switches so as to maintain their own characteristics. When the SL rubber cover type is used, there should absolutely be no tension applied to the cord. If there is the fear that tension may be applied, the L socket or socket with cord attached should be used. The maximum permissible tension with the above socket use is 98N{10kgF}. 4) The tightening torque when installing this limit switch should be 1.18 to 1.47 Nm (12 to 15 kgcm).

107 3x10 6.86N {700gf} (Plunger type) 1.11N {113gf}, 4.41N {450gf} (Arm type)

1.5x10

6.37N {650gf} 4.90N {500gf} 3.29N {400gf}
3x10 0.88N {90gf}, 5.88N {600gf}, 8. 83N {900gf}, 19.16N {2,000gf}
1.39N {142gf} 26.67N {2,720gf}

Free attachment

L socket (Solderand quick connect (#110) terminal) Socket with code Cabtire code 14 28mm.551 1.102inch (M4 screws) UL, CSA P.38
Screw terminal (Conduit connectors: PF: 1/2, PG: 13.5 types) Cabtire code 22 (47mm).866 1.850inch (M4 screws)
Screw terminal Cabtire cord Cap tire cable 21 56mm.827 2.205inch (M4 screws)
Screw terminal Cabtire cable (wiring type) 30.2 58.7mm 1.189 2.311inch (M5 screws) UL P.61
Screw terminal Cabtire cord Cabtire cable 21 56mm 827 2.205inch (M4 screws) P.68
Tab #110 terminal Lead wire Cabtire cord 30mm 1.181inch (M3) UL, C-UL P.72
Cabtire cord 52mm 2.047inch (M4) UL, C-UL, CE P.74
UL, C-UL, TV, CE UL, C-UL, TV, CE P.44 P.52
Notes: 1) Excludes exposed part of terminals, externally mounted components, and magnet catches. 2) Figures in parentheses ( ) indicate rated current of water-resistant type.

Other listed products

Product name PS Hall Sensors
Appearance AN9 Detector distance 2.5mm.098inch Magnetic detector type subminiature sensor Perfect for slide table limiting Economical price with operating display lamp attached. P.76

Feature

ACTUATOR SELECTION
Type Classification Pretravel (P.T.) Overtravel Operating Accuracy (O.T.) force (O.F.) Vibration shock Characteristics Push plunger type Small Medium Large Excellent Excellent High-level accuracy gives firm detection for position fixing, etc., by using perpendicular movement.
Roller plunger type (includes cross roller plunger)

Medium

Excellent
Operating range can be widened by mounting accessory actuators like cams, dogs, cylinders, etc. High-level detection for position fixing.

Roller arm type

Small to large

Good to excellent

The stroke in the direction of revolution is large at between 45 and 90 and the lever angle can be set at will to within 360 for easy use. Wide angle type (large O.T.) available. Can be used for wide-range position fixing.
Adjustable roller arm type
Lever length can be altered to allow rough operation detection using the roller lever characteristics.

Adjustable rod type

Wide range of operations, and convenient for uneven mountings. Lightest operation among the revolving operation type of limit switches. Rod length is adjustable, and bending is also easy.
If operated up to 55 position, revolves automatically to retain 90 position. Two dog operation enables recovery operation through single dog, or for anything that has caused the roller position to slip. Excluding the thread direction, direction can be adjusted up to 360. Operating power is the lowest of the limit switches, and is effective in detecting when direction and conditions are uneven. In order to absorb the movements after operation in the actuator part, work slippage tolerances are also large. Using a low speed, low torque cam, the lever can assume various shapes suited to the operation. The lever is very sturdy.

OPERATING CHARACTERISTICS

Operating Force (O.F.)

Roller Head block Actuator Arm Cam Roller Plunger Reset spring Pushbutton

Front view Cam Cord vent

Roller Reset spring Pushbutton

N.O. COM

[1 Form C(Single Pole Double Throw)]

VL limit switch

The force required to cause contact snap-action. It is expressed in terms of force applied to the actuator. Release Force (R.F.) The force to be applied to the actuator, at the moment contact snaps back from the operated position to unoperated position. Pretravel (P.T.) Distance of the actuator movement from free position to operating position. Overtravel (O.T.) The distance which the actuator is permitted to travel after actuation without any damage to the switching mechanism. Total Travel (T.T.) The distance which the actuator is permitted to travel from free position without any damage to the switching mechanism. Movement Differential (M.D.) The distance from operating to release position of the actuator. Operating Position (O.P.) The position of the actuator when the traveling contact snaps to the fixed contact. Release Position (R.P.) The position of the actuator when the traveling contact snaps back from the operating position to its original position. Free Position (F.P.) Position of the actuator when no force is applied to it.

Free position

O. P. Operating position

P.T. P.T.

[1 Form Z(Double Break Double Make)]

N.O. N.O.

O.T. M.D. R.P.

Contact type

Used in opposition to a semiconductor switch that has switching characteristics. Fulfills switch functions through a mechanical ON/OFF contact. Terminal mold After wiring, the connecting part is molding by epoxy resin for waterproof, oil-resistant and dust-proof capabilities.
R.F. O.F. P.T. F.P. R.T. M.D. O.T.T.F. O.P. R.P. Standard position T.T.
Note: F.P., O.P., and R.P. are expressed as distances from the standard position.
Glossary relating to the EN60947-5-1

EN60947-5-1

EN standard same as IEC947-5-1 Utilization categories The following examples express the classification of switches by category of use.
Category Contents Controls electromagnetic loads in excess of 72VA (Volt Amperes.) Controls resistance loads and semiconductor loads.

Rated impulse withstand voltage

Current type AC

Rated operational voltage (Ue)
The maximum rated voltage for switch operation. This must never exceed the maximum ratings insulation voltage (Ui). Rated operational current (Ie) The maximum rated current for switch operation. Rated insulation voltage (Ui) The maximum rated current value which guards the switchs insulation functions, forming the parameters for the resistance values and the mounting distance.
(Uimp) The peak impulse current value which enables the switch to resist without insulation breakdown. Rated enclosed thermal current (Ithe) The current value that enables current to flow without exceeding the specified maximum temperature in the recharging contact switch. If the pins are made of brass, the maximum temperature limit is 65C 149F. Conditional short circuit current The current the switch can resist until the short circuit protection device is activated. Short circuit protection device A device that protects the switch from short circuits through a circuit break (breakers, fuses, etc.) Switching overvoltage The surge momentarily generated when a circuit is closed. Must be lower than the Uimp value.

Pollution degree

Expresses in levels the environment in which the switch is used. The four levels are shown below. Limit switches come under contamination level 3.
Contents No contamination or, even if contamination is present, only non-conducting contamination is generated. Normally, only non-conducting contamination is generated, but there remains the possibility of temporary conducting contamination when the circuit is formed. Conducting contamination is generated, or else dry non-conducting contamination is generated by circuits which can be anticipated. Permanent conducting contamination is generated by dust, rain, snow, and other conductors.

Pollution degree 1

PROTECTIVE CONSTRUCTION

Protective construction

Expresses the degree of protective construction that guards the level of functionability of the switch against ingress of solid objects, water, and oil. The standards are IEC529 (IEC: International Electrotechnical Commission) standards. IEC standards determine the level of protection against both water and solid objects, but not against oil.
Protection against both water and solid objects

Level Protection level

Protection level and test methods

No particular protection

Protection against rain fall 3 Rain-proof No damage incurred when sprayed with water continuously for 10 minutes at angles of up to 60 from the perpendicular. Protection against flying foam 4 Protection against water Protection against spray 5 Spray-proof

3m 9.843ft. Nozzle radius 6.3mm.248inch Water pressure 30kP
Foam-proof No damage incurred when sprayed with water continuously for 10 minutes at angles of up to 180 from the perpendicular across a wide area.
No damage incurred when sprayed with a jet of water for 3 minutes from all directions, as per the diagram on the left.
Nozzle radius 12.5mm.492inch Water pressure 100kP
Protection against waves 6 Water proof

3m 9.843ft.

Water does not invade the interior when sprayed with a jet of water for 3 minutes from all directions, as per the diagram on the left.
Protection against corrosion while immersed in water 7 Corrosionproof

1m 3.281ft.

Water does not invade the interior during immersion for 30 minutes at a depth of 1m 3.281ft.
Level Protection level Protection against solid objects exceeding 1mm.039inch in size. 4

1.0.039 dia.

A hard wire 1mm dia.039 inch dia. across cannot penetrate the inside. Protection against solid objects 5 The unit is left for 8 hours in an atmosphere in which 2kg of talcum powder per 1m3 is floating. No damage incurred from talcum powder penetrating the inside. Protection againt dust (dust does not penetrate) 6 Dust-proof The unit is left for 8 hours in an atmosphere in which 2kg of talcum powder per 1m3 is floating. The talcum powder does not penetrate the inside. Note: 1. All of the tests cited above were conducted with the cord vent (conduit vent) tightly shut. 2. The above protective constructions are based on IEC standard but major differences may arise due to length of use and operating environment. This should be thoroughly discussed and verified. 3. When the corrosion-proof model is immersed in water for 30 minutes or more, verify that no water has penetrated the inside before use. Protection against dust

CAUTIONS FOR USE

DESIGN OF OPERATING DOG AND OPERATING SPEED
Pay attention to the following points when designing the dog for limit switch operation. 1. Make the dog faceplate as smooth as possible. 2. Adjust both the dog angle and the set arm angle as below, depending on the operating speed. 3. The depth (h) of the dog effects the lifespan of the limit switch. Therefore, set the depth to a maximum of 80% of the Total Travel (T.T.) 4. The relationship between the speed of the dog (V = m/s) and the tip angle () is as follows: 1) V&0.2m/s

= 45 to 90 V h

3) 0.5m/s ! V&2m/s

5) Roller plunger type

30 25
Vmax (m/s) 0.7 0.9 1.3 2.0

20 30

Vmax (m/s) 0.5 0.25
h (0.5 to 0.7) T.T. (0.6 to 0.8) T.T.
The maximum tolerable speed can be extended by further reducing the dog rise angle from 45 when 0.5m/s ! V&2m/s. It is necessary to set the arm so that the dogs cutting surfaces are always parallel ( o = 90 ) 4) Overriding the dog (V&0.2m/s)

60 to 90

Vmax (m/s) 0.2 0.1 0.05
When V&0.2m/s, set the arm to perpendicular and set the arm rise angle to between 45 and 90. If the dog rise angle is reduced, the maximum tolerable speed is increased. As a rule, = 45 is optimum. 2) V&0.5m/s

V = 45 h F

Even if overriding the dog, set the forwards and rearwards motion exactly the same, and avoid any settings that make the actuator accelerate rapidly from the dog. 5. Operation speed 1) When the operation (acting and reverting) speed is exceedingly slow, switching of the contacts will become unstable and this could cause problems such as failure to make contact and welding. As a guide, the speed should be at least 1mm/s. 2) When the operation (acting and reverting) speed is exceedingly fast, be careful because the violent motion could cause breakage and with increased frequency, contact switching will not be able to keep up. As a guide, the switching frequency should be within 20 times per minute.
If overriding the dog, set the arm perpendicularly, so that =45. If the dog angle is reduced, the tolerable speed is increased.

o = 45

Because the arm jiggle is as a minimum at a comparative speed such as V&0.5m/s, setting both the dog angle so that it travels perpendicularly and the arm angle to 45 is optimum.

PROTECTION CIRCUIT

1. The ON/OFF circuit for the guidance load may suffer contact damage due to surges or inrushes when the power is turned either ON or OFF. Consequently, insertion of a protective circuit as per the following diagram is recommended, in order to protect the contacts.
Circuit Limit switch contact Cautions for use (1) r must be a minimum of 10; (2) When using AC power: Q Impossible when R impedance is large. W Possible when c, r impedance is sufficiently small compared with R impedance. Can be used with both AC and DC as appropriate. r~R C: 0.1 F

Load GOOD Load L

2. Do not connect either irregular poles or power sources to a switch contact. Power connection examples (irregular pole connection)

NO GOOD Load L

3. Avoid circuits where power may find a way between the contact points (as this may cause welding.)

NO GOOD

Load Load connected to same pole

Limit switch contact

Example of unsuitable power connection (abnormal power connection)
Risk of AC and DC being mixed. NO GOOD Load L AC
(1) Dedicated DC use. (2) AC is impossible

ZNR Varistor

Can be used with both AC and DC as appropriate.

PRECAUTIONS RELATING TO THE INSTALLATION ENVIRONMENT
Avoid using in silicon environments such as organic silicon-based rubber, solvents, sealants, oil, grease, or wiring.

IMPROVEMENT EXAMPLES

Poor design Improved design Explanation
Problem Dog adjustment is difficult. Solution Separate each one until the dog can be adjusted.

Dog axle

Problem The dog axis is too long, and slips out during operation. For this reason, the limit switch operating position slips. Solution Firmly fix the dog plate to the base.

Detector

Printer Detector
Conveyer Conveyer Rotation axle
Problem The detector sinks, applying force to the limit switch. The limit switch O.T. cannot be set. Solution Relieve the pressure using an additional actuator, and the O.T. can also be set.

Rotation axle

Problem The area around the actuator coil is easily damaged. Friction generated during operation. Solution Relieve the friction by installing an additional actuator. Change the type of limit switch.
Problem Workers keep bumping the actuator. Solution Fit a protective cover to the side of the limit switch.

Protective cover

Problem Because the cord vent for the limit switch faces upwards, water droplets and so forth can easily penetrate the interior. The cord is constantly moving and thus easily damaged. Solution Fix the limit switch position on the stationary board. Fit a protective cover, so that water and oil cannot come into direct contact with the limit switch.
Problem The cord is not fixed, and gets pulled during work. Dog adjustment is ineffective. Solution Change the limit switch position, and fix the cord. Attach an adjustment mechanism to the dog.
High temperature High temperature
Problem The limit switch is near a high-temperature area. Dog adjustment is ineffective, and the dog keeps bumping the lever. Solution Move the limit switch further away. Make dog adjustment possible, and change the shape of the unit.
Poor design Improved design Explanation Problem The detector is scratched. Limit attachment adjustments are difficult The actuator is damaged. Specimen transfer is impeded. Solution Fix the limit position to behind the dumper to solve the above problems.

Dumper

Conveyer
Conveyer Conveyer Detector Detector
Problem The transfer path of the detector is not fixed, and it keeps bumping the actuator. The operating position is unstable. The actuator is damaged. Solution Stabilize the operating position by fitting an additional actuator. Make limit switch adjustment possible. Problem Stroke adjustment ineffective. Release the limit switch position, and ensure that the dog does not bump the lever. Solution Make dog adjustment possible. Change the limit switch position, and sure that the dog does not bump the lever. Problem The cam shape is unsuitable (especially during release and strike release.) Direction of limit switch attachment is unsuitable. Solution Render the cam shape smooth. Change the limit switch position.

2. North America

LISTING MARK

Fig. 1

RECOGNITION MARK

Fig. 2

UL (Underwiters Laboratories Inc.) This is a non-prot testing organization formed in 1894 by a coalition of U.S. re insurance rms, which tests and approves industrial products (nished products). When electrical products are marketed in the U.S., UL approval is mandated in many states, by state law and city ordinances. In order to obtain UL approval, the principal parts contained in industrial products must also be ULapproved parts. UL approval is divided into two general types. One is called listing (Fig. 1), and applies to industrial products (nished products). Under this type of approval, products must be approved unconditionally. The other type is called recognition (Fig. 2), and is a conditional approval which applies to parts and materials. CSA (Canadian Standards Association) This was established in 1919 as a non-prot, nongovernmental organization aimed at promoting standards. It sets standards for industrial products, parts, and materials, and has the authority to judge electrical products to determine whether they conform to those standards. The CSA is the ultimate authority in the eyes of both the government and the people in terms of credibility and respect. Almost all states and provinces in Canada require CSA approval by law, in order to sell electrical products. As a result, electrical products exported from Japan to Canada are not approved under Canadian laws unless they have received CSA approval and display the CSA mark. Approval is called certication, and products and parts which have been approved are called certied equipment, and display the mark shown in Fig. 3. The mark shown in Fig. 4 is called the Component Acceptance mark, and indicates conditional approval which is applicable to parts. The C-UL mark shown in Fig. 5 (nished products) and Fig. 6 (parts) indicates that the product has been tested and approved in UL laboratories, based on UL and CSA standards, through mutual approval activities.

Certification

Fig. 3

TV Rheinland

Component Acceptance

Fig. 4

Fig. 5

Fig. 6

SAFETY STANDARDS RECOGNITION

Limit switches

Product name SL limit switches Dies-cast case standard load type HL limit switches Die-cast case low level load type (includes connector type) Plastic case standard load type Plastic case low level load type ML limit switches Standard type E122222 E122222 E122222 E122222 E99838 File No. E122222 UL recognized Approved ratings 4A 250V AC 5A 250V AC Pilot duty B300 0.1A 30V DC E122222 5A 250V AC Pilot duty B300 0.1A 30V DC 10A 250V AC 5A 250V AC 5A 250V AC Pilot duty B300 6A 380V AC Pilot duty A300 10A 1/2HP 125V AC 6A 1/2HP 250V AC 5A 250V AC E43149 Water-resistant type E122222 2A 250V AC 5A 250V AC Pilot duty B300 E122222 (C-UL) LR55880 E122222 (C-UL) E122222 (C-UL) E43149 (C-UL) E43149 (C-UL) E122222 (C-UL) LR55880 File No. LR55880 CSA certified Approved ratings 4A 250V AC 5A 250V AC Pilot duty B300 0.1A 30V DC 5A 250V AC Pilot duty B300 0.1A 30V DC 10A 250V AC 5A 250V AC 5A 250V AC Pilot duty B300 6A 380V AC Pilot duty A300 5A 250V AC 2A 250V AC 5A 250V AC Pilot duty B300 J9551204 J9551203 J9551205 File No. J9650514 DC-12 0.1A 30VAC-15 2A 250V~ DC-12 1A 30VDC-12 0.1A 30VAC-15 2A 250V~ AC-15 2A 250V~ AC-15 2A 250V~ TV approval Approved ratings DC-12 1A 30V-

J9650515

Epoxy-sealed terminal type With lamp QL limit switches Standard type VL limit switches With neon lamp DL limit switches Vertical limit switches Compact Magnelimit Magnelimit Standard type

CE MARKINGS OVERVIEW

Limit switches conforming to EN/IEC standards
The limit switches shown below conform to both EN and IEC standards, and may display the CE markings.
Product classification Product name HL ML VL DL Magnelimit Suitable standard EN60947-5-1 EN60947-5-1 EN60947-5-1 EN60947-5-1 EN60947-5-1 Approving body TV TV TV TV File No. J9650514/J9650515 J9551204 J9551203 J9551205
The EN standards were established as universal EU standards in order to facilitate EU directives. These standards were merged with the international IEC standards and henceforth reflect the standards in all countries. Also, the CE markings show that products conform to EC directives, and guarantee the free flow of products within the EC.
Note: Refer to the page for each individual product for detailed approval conditions and approved types. Moreover, the HL limit switch alone does not display the CE mark as standard. If the CE mark is necessary, add (CE) to the end of the part No. when ordering.

What are EN standards?

An abbreviation of Norme Europeenne (in French), and called European Standards in English. Approval is by vote among the CEN/CENELEC member countries, and is a unified standards limited to EU member countries, but the contents conform to the international ISO/IEC standards. If the relevant EN standard does not exist, it is necessary to obtain approval based on the relevant IEC standard or, if the relevant IEC standard does not exist, the relevant standard from each country, such as VDE, BS, SEMKO, and so forth.