FEATUREAT


SWITCHES, DISPLAYS & UIS SAFE


Emergency industr


A


Top of the list of measures that can be taken to mitigat e these risks is the inclusion of an emergency stop (e-stop) switch, the use of which will warrant prompt and reliable disconnection of power. In essence, the device needs to be operational at all t imes and provide a fool proof, mechanical means for a human to bring the equipment t o a safe standstill, preventing potential injury. It is key that the machine cannot be rest arted after actuation, without a deliberate reset to


mong t he UK’s many manufacturing strengt hs is the design and production of electromechanically controlled industrial equipment. But as the equipment increases in sophistication, so too does the risk of damaging it and its operators, when things go wrong. f h li f


h


the e-stop funct ion, prior to a separate rest art of the equipment.


Virtually all industry implementations must feat ure mandate safe


electromechanical e-st ops that meet safety regulations. Appropriate applications usually hold plenty of available panel space to accommodate the robust, heavy-dut y construction that is the hallmark of ubiquitous 22.5mm e-stop devices. However, in


many modern designs, the ergonomic and aesthetic design of the equipment leads to a compact control HMI that can be comfortably controlled in hand,


or worn around the body. Alt ernatively, t he e-stop device may need to be incorporated together wit h a touch


screen in an operator panel, wit h limited available depth. All these modern HMI applications incite the inclusion of an efficient e-stop swit ch, compliant with the aforementioned safety features and up-to-date e-stop legislation.


But, HMI controls can also be plagued by fine or abrasive dust and chemicals, among other hazardous elements, the


ingress of which could prevent an e-st op from doing it s job. Other enemies include


30 MAY 2019 | ELECTRONICS With safety being such a headlined to examines the applicat


switches and how it affects production high pressure cle


ETY FIRST stop solutions f rial equipment


opic of


discussion, Robert Davies, marketing manager in the UK at EAO, examin


eaning jets, not to


mention operator misuse and accidental mechanical dam


be treated as ‘fit and forget’ components, it’s essential tha from these adve


age. As e-stops tend to t and forget’ components, t they are fully prot ected rse outside influences.


To combat these designed its own e-stops, specific modern applicat The ergonomic head measures 27 40mm version is high brightness


SERIES 61 COM b h


e-stop visibility. jet-wash proof, harsh environme


MPACT E-STOPS AO h


e concerns, EAO has n Series 61 Compact cally to meet the needs of ions.


cally shaped operation 27 mm in diameter but a s available. The optional central L ED augments


T he push-button is also suitable for many ents.


In terms of its current 61 e-stop switch


available with up


contacts per device t low current switc


current capacity, series hes are designed for low


voltage applications up to 50V. They are p to t hree separate gold vice to provide reliable, ching of up to 0.2A. , in response to earlier ries 61 e-stops comply nternational safety


But importantly, in response t deliberations, se with the latest in


standards, incorporating a mechanically decoupled trigger act break electrical cont


indication ring, visible thanks t central LED.


i ibl h k


SERIES 84 MAI INS VOLTA COMPACT


LT CT E-STOPS


Away from the lo the series 61, the alternately applic equipment that switching voltag rated at 3A and 2 at 1.5A.


The version wit only 13.5mm pan the plug-in varia 18mm of depth. 84 follows and c international spe


ow voltage supply of


e series 84 e-stops are cable to space critical requires a higher e: 120VAC variants are 240VAC devices are rated


th flying leads requires nel depth, in contrast to ants, which necessitate Similarly , the series


complies with related ecifications.


/ ELECTRONICS TAGE


porating a mechanically er action mechanism to contacts, as well a green visible thanks to the


The series with flyin


s 84 e-stop, g leads


tion of e-stop on line welfare


of e stop


for


Referring to concerns about unpropitious outside int series 84 e-stops are resistant to IP67 sta


rns about


a mechanical life in excess of 250,000 operations, more than four time t 6,050 operations specified by with the series 61, LE enhances visibility for t


e interference, the e oil and water ndards, boasting excess of 250,000 an four time the ecified by ISO. As ED illumination or the Series 84


e-stops, from both the front the side in low light environment With these features, one finds that EAO’s series 61 and 84 e-st one solution to the complicat e-stop switches within t


industry. Combatting the adverse effects of the working environment


ensuring a smooth, safe service, are essential successes for an e-swit succeed. Perhaps EAO can provide one f ibl


feasible answer to an EAO www.eao.com


for an e-swit ch to AO can provide one ny uncert ainties.


the front and from environments. s, one finds that 84 e-stops provide complications facing hin the electronics g the adverse effects onment, whilst safe service, are


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