Compressed Air Best Practices - April 2008 - (Page 37)

Compressed Air Industry PLASTICS BLOW-MOLDING | 04/08 | of pneumatic valve technology? Benefits to OEMs The benefits offered to OEMs regarding advancements in ISO standardization, collective wiring solutions and diagnostic capabilities are tremendous. ISO standardizations with multi-vendor support ensure lead-time is no longer an issue. Regional business issues sustained by one vendor will very rarely affect the performance or output of another. With many manufacturers offering complete ISO valve product lines, including discretely wired valves, collectively wired valves, sandwich regulators, flow controls, transition plates, English threads, metric threads and a variety of voltage and fieldbus options, designers can work with confidence knowing all their needs can be met. And with the ISO specification governing valve sizes ranging from 18mm up to 64mm wide, a complete range of flow rates are available. When utilizing collective wiring solutions with fieldbus, the time required to measure, cut, strip, terminate and label a solenoid is eliminated, equating to a savings of three minutes per connection. When analyzing a standard hard-wired system where each solenoid is wired individually, the timesavings become more apparent. A standard solenoid will have three leads going from the valve to a junction box, one for positive voltage, one for common and one for ground. Once back at the junction box, most machine builders group all the common voltage lines together as well as all the ground lines together for the run from the junction box to the control panel to reduce wiring. Thus, there can be four connection points for each solenoid on the valve in the system: one at the solenoid, one at the valve side of the terminal strip in a junction box, one at the control panel side of the junction box and one at the PLC output card inside the control panel. Considering many fieldbus equipped valve manifolds offer a 32 solenoid capacity, this could have an assembly time reduction of over 13 hours! CONNECTION LOCATION TYPE OF CONNECTION CONNECTIONS TIME CO2 O ISO Specifications 15407 and 5599 offer pneumatic valve users protection against ever changing business conditions and product obsolescence Valve Connection Junction Box — Valve Side Junction Box — Control Panel Side Control Panel (3 valve leads) x (32 valves) (3 valve leads) x (32 valves) 32 outputs + common + ground 32 outputs + common + ground Total 96 96 34 34 260 288 min 288 min 102 min 102 min 780 minutes (13 hours) Wiring savings of a 32-station valve manifold, at three minutes per connection. kW www.airbestpractices.com 37 http://www.airbestpractices.com

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Compressed Air Best Practices - April 2008 Contents From the Editor Utility-Air News The Compressed Air Audit of the Month: Minimizing Blow-Molding Pressure Fluctuations AF Compressors: Focused on 40 Bar, Oil-Free Air for the PET Industry Real World Best Practices: PET Plants Using Boosters for High-Pressure Air Guaranteeing Audit ROI for Blow-Molders Managing Vacuum Pressure Differential Are You Taking Full Advantage of Pneumatic Valve Technology? Are You Strategic? Resources for Energy Engineers: Training Calendar & Product Picks Wall Street Watch Advertiser Index Job Market

Compressed Air Best Practices - April 2008

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