© Siemens AG 2015 Belt Scales Speed sensors SITRANS WS300 ■ Overview SITRANS WS300 is a low- to high-resolution shaft-driven speed sensor. ■ Benefits • • • • Compact and economical Easy, low-cost installation Accurate belt speed detection Optional resolutions for measurement over a range of belt speeds • Corrosion resistant 4 ■ Application SITRANS WS300 speed sensor operates in conjunction with a conveyor belt scale, providing a signal to an integrator which computes the rate of material being conveyed. At only 1.22 kg (2.68 lb), it is one of the lightest and most durable units ever developed for monitoring conveyor belt speed. With its rugged cast aluminum housing, it is suitable for outdoor installation, and its low weight prolongs bearing life. It is directly coupled to a rotating tail or bend pulley shaft to ensure accurate belt-travel readout, eliminating problems caused by belt slippage or material build-up. The WS300 converts shaft rotation into a pulse train of 32, 256, 1 000, or 2 000 pulses per revolution using a high precision rotary optical encoder. The digital signal is transmitted as speed input to any Siemens integrator for calculation of belt speed, flow rate and totalized weight. This low- to high-resolution speed sensor provides a frequency signal proportional to the shaft speed, enabling a range of speeds to be read accurately. The quadrature type shaft encoder prevents erroneous speed signals due to vibration or shaft oscillation. The WS300 is easily mounted and is bi-directional for either clockwise or counter-clockwise belt travel. The IS version uses an inductive proximity switch detecting rotating targets. Siemens WT 10 · Update 04/2015 4/45 © Siemens AG 2015 Belt Scales Speed sensors SITRANS WS300 ■ Design Mounting: Mounting to a Tail Pulley Angle bracket slotted for arrestor rod Tension spring (supplied) d Belt Tension spring (supplied) Arrestor rod (cut to suit) 89 (3.5) ≥ 10 (0.39) Angle bracket slotted for arrestor rod WS300 Flexible conduit Mounting to a Bend or Snub Pulley Tension spring (supplied) Stringer Stringer Tension spring (supplied) Arrestor rod (cut to suit) 10 (0.39) drilled hole 89 (3.5) Bend or snub pulley WS300 Pulley bearing belt Flexible conduit Notes: When mounting to a bend or a snub pulley only, a 10 mm (0.39 inch) drilled hole is required for the arrestor rod. WS300 mounting 25 (1.0) 0.254 (0.01) A A 1) Use adhesive when installing threaded shaft coupling (e.g. Loctite). WS300 mounting using threaded shaft coupling 4/46 Siemens WT 10 · Update 04/2015 M12 x 1.751) Mounting using optional threaded shaft coupling: M12 x 1.75 4 Notes: Distance ‘d’ is the take-up travel on the tail pulley. When adjusting the belt take-up, ensure that there is play on the arrestor rod. If the arrestor rod is pushed against the end of its travel slot, premature bearing wear may result. 95 (3.75) 25 (1.0) Set screw © Siemens AG 2015 Belt Scales Speed sensors SITRANS WS300 ■ Technical specifications 1) 2) 3) SITRANS WS300 SITRANS WS300 Mode of operation Measuring principle Approvals Standard: pulse from shaft rotation using high precision rotary optical encoder WS300 Standard General • CE, RCM, GOST-R IS: pulse from inductive proximity switch Hazardous • CSA/FM Class II, Div. 1, Groups E, F, G; Class III • ATEX II 2D Ex tD A21 IP65 T70 °C • GOST-R Ex, RTN • IEC Ex, Ex tD A21 IP65 T70 °C WS300 IS (with suitable IS switch isolator or switch amplifier)1) • ATEX II 1G EEx ia IIC T6 • ATEX II 1D Ex iaD 20 T 108 °C • CSA/UL: Class I, Div. 1, Groups A, B, C and D; Class II, Div. 1, Groups E, F and G; Class III, Div. 1 • CE, RCM2) Proximity switch approval ratings (Pepperl+Fuchs #NJ0.8-5GM-N) • ATEX II 1G EEx ia IIC T6 • ATEX II 1D Ex iaD 20 T 108 °C • CSA, UL • CE2) Typical application When a low- to high-resolution speed sensor is required Input Shaft rotation 0.3 … 2 000 rpm, bidirectional, resolution dependent Output • Unidirectional open collector, NPN, sinking output • Standard: 10 … 30 V DC, 25 mA max. • IS: NAMUR NC, load current, 0 … 15 mA • 32, 256, 1 000, or 2 000 pulses per revolution (ppr) • 32 ppr: 2 000 max. rpm, 1 066 Hz • 256 ppr: 2 000 max. rpm, 8 530 Hz • 1 000 ppr: 900 max. rpm, 15 000 Hz • 2 000 ppr: 450 max. rpm, 15 000 Hz Rated operating conditions Ambient temperature • Standard: -40 … +55 °C (-40 … +131 °F) • IS: -25 … +100 °C (-13 … +212 °F) Degree of protection NEMA 4X, Type 4X, IP65 Optional switch isolator (required for WS300 IS)3) • Pepperl+Fuchs #KFA5-SOT2-Ex2 • ATEX II (1) G [EEX ia] IIC or #KFA6-SOT2-Ex2 • CSA/UL: Class 1, Div. 1, Groups A, B, C, and D. Class II, Div. 1, Groups E, F, and G, Class III • CE2) Design Enclosure • Rated NEMA 4X, Type 4X, IP65 • Painted aluminum • Stainless steel (optional) Power supply • Standard: 10 … 30 V DC, 60 mA max. • IS: 5 … 16 V DC, 25 mA max. (from IS switch isolator) Cable Recommended 1) 2) 3) • Standard: 3-wire shielded, 0.82 mm² (18 AWG) • IS: 2-wire shielded 0.324 mm² (22 AWG) • Max. run 305 m (1 000 ft) Approvals for WS300 IS are based on internally mounted NAMUR proximity switch (Pepperl+Fuchs #NJ0.8-5GM-N) and use of suitable IS switch isolator (amplifier). Please see WS300 operating instructions for more information. Approvals for WS300 IS are based on internally mounted NAMUR slotted proximity switch (Pepperl+Fuchs #NJ0.8-5GM-N) and use of suitable IS switch isolator (amplifier). Please see WS300 operating instructions for more information. Approval ratings for the proximity switch and IS switch isolator are the property of Pepperl+Fuchs. Copies of these approval certificates may be obtained at http://www.siemens.com/processautomation. Siemens WT 10 · Update 04/2015 4/47 4 © Siemens AG 2015 Belt Scales Speed sensors SITRANS WS300 ■ Selection and ordering data Article No. SITRANS WS300 speed sensor A medium- to high-resolution shaft-driven speed sensor used with Milltronics belt scales. 7MH7177- Further designs 7 7 7 77 0 Please add "-Z" to article no. and specify order code(s). Click on the Article No. for the online configuration in the PIA Life Cycle Portal. Acrylic coated, stainless steel tag [13 x 45 mm ¢ Y17 (0.5 x 1.75 inch)]: Measuring-point number/identification (max. 16 characters), specify in plain text Resolution (pulses per revolution) 32 ¢ 1 256 ¢ 2 1 000 ¢ 3 2 000 ¢ 4 Manufacturer's test certificate: According to EN 10204-2.2 Enclosure Operating instructions Article No. 7ML1998-5ML01 • German 7ML1998-5ML31 ¢ A 304 (1.4301) stainless steel, vibra finish NEMA 4X ¢ B Spare parts Approvals CSA/FM Class II, Div. 1, Groups E, F, G Class III ATEX II 2D, Ex tD A21 IP65 T70 °C, CE, RCM, IECEx, Ex tD A21 IP65 T70 °C ¢ CSA/UL Class I, Div. 1, Groups A, B, C, and D; ¢ Class II, Div. 1, Groups E, F, and G; Class III, Div. 1, ATEX II 1G, EEx ia IIC T6, ATEX II 1D Ex iaD 20 T108 °C, CE, RCM1)2) ¢ CE, RCM A B D Connections Standard, up to 2 integrators ¢ 1 2 Multiple, up to 10 integrators Switch isolator ¢ Not required 115 V AC3) 0 1 230 V AC3) 2 ¢ C11 • English Note: The operating instructions should be ordered as a separate item on the order. Polyester painted aluminum, NEMA 4X 4 Order code Circuit card 32 PPR, up to 2 integrators 7MH7723-1GL Circuit card 32 PPR, up to 10 integrators 7MH7723-1GK Circuit card 256 PPR, up to 2 integrators 7MH7723-1GM Circuit card 256 PPR, up to 10 integrators 7MH7723-1GN Circuit card 1 000 PPR, up to 2 integrators 7MH7723-1GP Circuit card 1 000 PPR, up to 10 integrators 7MH7723-1GQ Circuit card 2 000 PPR, up to 2 integrators 7MH7723-1JL Circuit card 2 000 PPR, up to 10 integrators 7MH7723-1JM Circuit card 32 PPR, IS 7MH7723-1HC Rubber coupling 7MH7723-1CM Coupling hub for 32, 256 PPR versions 7MH7723-1CN Coupling hub for 1 000, 2 000 PPR versions 7MH7723-1GR Enclosure cover 7MH7723-1CJ Enclosure bearing assembly 7MH7723-1CK Enclosure cover, stainless steel 7MH7723-1GS Enclosure bearing assembly, stainless steel 7MH7723-1GT Threaded shaft coupling 7MH7723-1GH Arrestor rod 7MH7723-1FV Arrester rod tension spring 7MH7723-1CP WS300 mounting bracket for MD-36 retrofit 7MH7723-1NB WS300 mounting bracket SS for MD-36 retrofit 7MH7723-1NC Cable for speed sensor connection to termination box 3 cond, 18G (order per meter) 7MH7723-1JP Cable for IS speed sensor connection to termination box 3 cond, 22G (order per meter) 7MH7723-1JQ Pepperl+Fuchs IS switch isolator, 115 V AC 7MH7723-1EB Pepperl+Fuchs IS switch isolator, 230 V AC 7MH7723-1EC 1) The Approval Ratings for the Proximity Switch and the IS switch isolator are the property of Pepperl+Fuchs. For current approvals, go to: http://www.am.pepperl-fuchs.com. 2) Approval option B requires use of switch isolator to interface with the belt scale integrator, and is available with Resolution option 1, and Connections option 1 only. 3) For use with IS approval option B. ¢ We can offer shorter delivery times for configurations designated with the Quick Ship Symbol ¢ 4/48 Siemens WT 10 · Update 04/2015 © Siemens AG 2015 Belt Scales Speed sensors SITRANS WS300 ■ Dimensional drawings Shaft 102 (4.00) 159 (6.25) 60 (2.38) 15.9 (0.63) Rod 102 (4.00) 89 (3.5) 131 (5.16) 111 (4.36) 8 (0.31) 305 (12) 50 (1.96) ½" NPT conduit entrance (optional M20 adapter available) WS300, dimensions in mm (inch) ■ Schematics Connections (IS) Connections (Standard) Description Terminal Description Terminal 10 ... 30 V DC 1 2 +5 ... +16 V DC, 25 mA max. (from IS switch isolator) 1 Speed out-CW Speed out-CCW 3 Speed out 2 Ground GND Common 4 Ground GND • Determine the pulley shaft rotation on the end of the pulley shaft to which the WS300 is attached. • If the pulley shaft is rotating clockwise, connect the appropriate wire to terminal 2. If the pulley shaft is rotating counterclockwise, connect the appropriate wire to terminal 3. • Do not connect terminals 2 and 3 at the same time. • Connection between the WS300 standard unit and the integrator should be made with three-wire shielded, 0.82 mm2 (18 AWG) cable. • Ground shield of cable at integrator only. • Connect shield to appropriate terminal at the integrator. Terminal connections to integrator WS300 1 +V 2 CW 3 CCW 4 Cmn GND Milltronics BW500 19 16 16 17 N/C SIWAREX FTC CI+, 1L+ CI- CI- 1M N/C SIWAREX WP241 DI.0 DI.0 2M, 1M N/C 1L+ 4 • Only terminals 1 and 2 are required; rotation in a clockwise or counter-clockwise direction is not required. • To connect the switch isolator, use two-wire shielded 0.324 mm2 (22 AWG) cable. Use the same cable to connect the switch isolator to the integrator. • Ground shield of cable at integrator only. • Connect shield to appropriate terminal at the integrator. Terminal connections to integrator WS300 IS IS switch Milltronics isolator BW500 Terminal 1 3 2 1 SIWAREX FTC SIWAREX WP241 7 16 1L+ 1L+ 8 17 CI+ CI+ Connect CI- to Common Siemens WT 10 · Update 04/2015 4/49