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QL Datasheet(PDF) 14 Page - Panasonic Semiconductor |
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QL Datasheet(HTML) 14 Page - Panasonic Semiconductor |
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14 / 21 page  8 α Vmax (m/s) CAUTIONS FOR USE 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 ( α) is as follows: 1) V&0.2m/s 3) 0.5m/s ! V&2m/s Because the arm jiggle is as a mini- mum 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. If overriding the dog, set the arm per- pendicularly, so that α =45°. If the dog angle is reduced, the tolerable speed is increased. 5) Roller plunger type DESIGN OF OPERATING DOG AND OPERATING SPEED When V&0.2m/s, set the arm to per- pendicular and set the arm rise angle to between 45° and 90°. If the dog rise angle is reduced, the maximum tolera- ble speed is increased. As a rule, α = 45° is optimum. 2) V&0.5m/s 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 dog’s cutting surfaces are always parallel ( θ o = 90°– α) 4) Overriding the dog (V&0.2m/s) h V α = 45° to 90° F o h α V θ F h V α = 45° o = 45 ° θ h α α h α α 45° 0.2 60° 0.1 60 to 90° 0.05 α Vmax (m/s) Even if overriding the dog, set the for- wards 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 prob- lems 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. 20° 0.5 30° 0.25 h (0.5 to 0.7) T.T. (0.6 to 0.8) T.T. α Vmax (m/s) 45° 0.2 60° 0.1 60 to 90° 0.05 α Vmax (m/s) 40° 0.7 35° 0.9 30° 1.3 25° 2.0 |
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