Panasonic SF4-AH Series Instruction Manual

© Panasonic Industrial Devices SUNX Co., Ltd. 2013 MJE-SF4A No.0038-55V- 39 -[For use in the United States of America (as per ANSI B11.19)] Equation 2 S = K × (T s + Tc + TSF4 + Tbm) + DpfS : Safety distance (mm)Minimum required distance between the sensing area surface and thedangerous parts of the machineK : Intrusion speed {Recommended value in OSHA is 63 (inch/s) [≈ 1,600 (mm/s)] }ANSI B11.19 does not define the intrusion speed ‘K’. When determining K,consider possible factors including physical ability of operators.Ts : Halting time calculated from the operation time of the control element (air valve,etc.) (s)Tc : Maximum response time of the control circuit required for functioning the brake (s)TSF4 : Response time of this device (s)Tbm : Additional halting time tolerance for the brake monitor (s)The following equation holds when the machine is equipped with a brake monitor.Tbm = Ta - (Ts + Tc)Ta : Setting time of brake monitor (s)When the machine is not equipped with a brake monitor, it is recommended that20% or more of (Ts + Tc) is taken as additional halting time.Dpf : Additional distance calculated from the size of the minimum sensing of thesensor (mm)Dpf = 78.2mmWhen using the floating blanking function, the size of the minimum sensing object becomes larger.According to ANSI B11.1, in case d > 64mm (2.5 inches), Dpf = 900mm (3ft).Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight differencebetween the representation in (mm) and that in (inch). Refer to the relevant standard for the details. Calculation Example 2 For use in the United States of America[OFF response time: 11ms or less, minimum sensing object diameter: 1.2 inch ≈ 30 (mm)]S = K × (Ts + Tc + TSF4 + Tbm) + Dpf= 63 × (Ta + 0.011) + 3.4 × (d - 0.276) (inch)= 63 × (Ta + 0.011) + 3.4 × (1.2 - 0.276)= 63 × Ta + 63 × 0.011 + 3.4 × 0.924= 63 × Ta + 3.8346≈ 63 × Ta + 3.84 (inch)In case this device is installed in a system with a maximum halting time 0.1 (s)S = 63 × Ta + 3.84= 63 × 0.1 + 3.84= 10.14 (inch)≈ 257.6 (mm)Hence, as per the calculations S is 257.6 (mm).Since the calculation above is performed by taking 1 (inch) = 25.4 (mm), there is a slight differencebetween the representation in (mm) and that in (inch). Refer to the relevant standard for the details.Dpf = 3.4 × (d - 0.276) (inch)≈ 3.4 × (d - 7) (mm)d: Minimum sensing object diameterNote that the value of Dpf cannot be 0 or less.