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Blog 28 ott 2026 LEMA Electric

Durata della marcatura delle legende dei pulsanti: checklist di verifica e acquisto

La durata della marcatura delle diciture sui pulsanti indica che l'identificazione del comando rimane leggibile, correttamente associata al pulsante e utilizzabile dopo la normale esposizione alle operazioni di manipolazione e pulizia previste. Un'etichetta che appare nitida al momento della consegna può comunque risultare inadatta se si solleva, perde contrasto o diventa ambigua durante l'utilizzo. Prima di effettuare l'ordine, specificare la struttura effettiva della marcatura, la superficie del pannello, il metodo di pulizia e i criteri di ispezione. Questa guida propone una procedura di verifica per gli acquirenti e i progettisti di apparecchiature; non dichiara una durata specifica della marcatura, un risultato standardizzato di resistenza all'abrasione né un'opzione di marcatura valida per tutte le varianti LEMA PBS. Distinguere il significato dalla durata Il primo aspetto da considerare è ciò che comunica la dicitura. Il secondo è se continua a trasmettere lo stesso messaggio dopo l'utilizzo. L'approvazione del testo non implica l'approvazione dell'adesivo, del supporto o del processo di stampa. Allo stesso modo, un'etichetta integra potrebbe comunque identificare una funzione errata dopo una modifica dei comandi. Nel registro del progetto, mantenere l'approvazione del contenuto e quella della resistenza fisica collegate, ma chiaramente distinte. Per interpretare i simboli, consultare la guida ai simboli dei pulsanti. Per la presente verifica, identificare l'esatta posizione dell'etichetta, la revisione della dicitura e l'associazione prevista con il comando fisico. Una decisione relativa al simbolo di uno schema elettrico non dimostra l'idoneità di una marcatura esterna sul pannello. Un'etichetta sostitutiva deve corrispondere sia alla funzione approvata sia alla struttura fisica richiesta. Definire dove viene applicata l'identificazione La marcatura può trovarsi sulla calotta del pulsante, su una targhetta separata, sul pannello circostante o su un'altra superficie approvata. Queste configurazioni sono soggette a diverse condizioni di manipolazione e sostituzione. Una calotta può essere esposta al contatto diretto delle dita. Una targhetta circostante può essere sottoposta a pulizie ripetute senza azionamento diretto. Una marcatura sul pannello può rimanere in posizione quando il pulsante viene...

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Blog 28 ott 2026 LEMA Electric

Azionamento dei pulsanti con i guanti: convalidare l'intera attività dell'operatore

L'azionamento dei pulsanti con i guanti deve essere convalidato utilizzando il guanto effettivo, l'attività dell'operatore e il pannello assemblato. Un pulsante più grande, da solo, non garantisce un utilizzo affidabile. Verificare se l'operatore è in grado di identificare il comando, raggiungerlo senza sforzo, premerlo intenzionalmente, riconoscere la risposta e rilasciarlo senza toccare un comando adiacente. Durante tutta la valutazione, mantenere il guanto protettivo richiesto dalla valutazione dei rischi sul luogo di lavoro. Questa guida fornisce una lista di controllo pratica per l'acquisto e le prove; non assegna un livello di idoneità all'uso con i guanti a un interruttore né stabilisce un diametro universale del pulsante, una distanza standard tra i pulsanti o una forza di azionamento specifica. Definire l'attività prima di selezionare il pulsante Iniziare con una breve descrizione delle operazioni svolte dall'operatore. Un breve ripristino una volta per turno è diverso da azionamenti ripetuti con mantenimento della pressione, da movimenti di regolazione in modalità jog e da modifiche occasionali della selezione. Registrare la normale posizione iniziale, la risposta prevista e le conseguenze di un'operazione mancata o involontaria. Specificare se durante l'azione l'operatore guarda il pulsante, il pezzo in lavorazione o un altro display. Questi dettagli determinano gli aspetti da osservare durante la prova, anziché limitarsi a verificare se un volontario riesce a premere un campione una sola volta. Considerare il pulsante, l'etichetta, l'indicatore e il dispositivo di controllo associato come un'unica interfaccia. Una pressione che chiude i contatti può comunque risultare inefficace se la persona non riesce a capire se il comando è stato accettato. Al contrario, un indicatore visibile può confermare un comando senza dimostrare che la macchina abbia raggiunto lo stato richiesto. Documentare il significato di ciascun segnale. Il progettista dell'apparecchiatura deve determinare separatamente le funzioni di protezione richieste; un normale pulsante e una prova di usabilità con esito positivo non dimostrano l'esistenza di una funzione di comando relativa alla sicurezza. Utilizzare esattamente il guanto protettivo previsto durante la prova Specificare il produttore, il modello, la taglia, il materiale, la fodera e le condizioni del guanto. Includere anche l'eventuale sottoguanto normalmente...

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Blog Oct 27, 2026 LEMA Electric

Finecorsa per ambienti pericolosi: verifica dell'approvazione prima della selezione

Hazardous location limit switches must be selected against the area's classification, the substances present and the equipment's applicable approval conditions. A metal housing, an IP rating or a familiar roller lever does not establish explosion protection. Start with a competent site classification and verify the exact device and installation evidence before purchasing. The LEMA LZ1 product family is referenced here to explain ordinary mechanical-switch interfaces. This article does not claim that an LZ1 variant is approved for a hazardous location. Without exact applicable evidence, do not substitute an ordinary industrial switch into a classified installation. Establish the area classification before comparing switches “Hazardous” is sometimes used informally to describe any dangerous machine. Electrical hazardous-location selection has a more specific context: potentially explosive atmospheres and the requirements for equipment installed there. Mechanical trapping hazards, electrical shock and explosion risks can coexist, but they are different assessment questions. A switch suited to ordinary machine travel detection is not automatically appropriate for every environment around that machine. The HSE overview of ATEX and explosive atmospheres explains the relationship between potentially explosive atmospheres, workplace responsibilities and equipment requirements in its jurisdiction. Use the classification and rules applicable to the installation location. Do not translate an informal description such as “chemical factory” into an equipment approval requirement without the responsible site's documented assessment. Obtain the classification drawing and the substance information relevant to the switch location. The conditions at a loading point may differ from those in a nearby control room. The position of the enclosure, actuator and wiring route all matter. Purchasing should receive the approved requirements rather than being expected to infer a classification from a process photograph or the name of the...

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Blog Oct 27, 2026 LEMA Electric

Grado di inquinamento dell’ingresso di alimentazione: definisce l’ambiente di isolamento

Power inlet pollution degree describes the expected contamination conditions affecting insulation in the relevant equipment environment. It is not a measure of outdoor air quality, a waterproof rating or a shortcut to selecting an inlet by current alone. Define the microenvironment around the insulating paths, including dust, moisture and possible condensation, then review the component and finished assembly under the applicable equipment requirements. For the LEMA IPZ inlet family, request evidence for the exact ordered version and intended installation. This guide does not assign a pollution degree, approval or permissible spacing to an unidentified IPZ variant. Define the environment at the insulation A factory can have dusty production areas while a protected compartment remains comparatively clean. Conversely, a cabinet installed in an ordinary room can draw contaminated air through a fan or collect condensation during temperature changes. The relevant question is what reaches the insulation being assessed over the equipment's intended use, not simply whether the building is described as indoor or outdoor. The IEC insulation coordination publication covers clearances, creepage distances and criteria for solid insulation within its stated scope. NI's explanation of pollution degree describes how contamination categories relate to electrical equipment and insulation distances. Use these sources to frame the review; obtain the applicable requirements and full component evidence before choosing actual limits. Map the inlet region separately from other parts of the machine. The accessible mating side, the internal terminals and nearby insulating surfaces may experience different conditions. An external panel gasket may protect one interface while leaving internal wiring exposed to cabinet contamination. A useful drawing identifies the path being assessed, the boundary relied on and the environmental assumption behind it. IPZ-4 flange and three...

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Blog Oct 27, 2026 LEMA Electric

Declassamento in quota del microinterruttore: limiti elettrici e termici separati

Micro switch altitude derating requires separate reviews of insulation, contact switching and heat in the installed equipment. A current and voltage marking alone does not establish suitability at a mountain site or in a reduced-pressure enclosure. Ask the supplier for the exact variant's environmental limits, then assess the assembly under its applicable equipment standard. Do not borrow a correction factor from a motor, breaker or unrelated switch. For the LEMA KW7 series, this article provides an application-review workflow; it does not assign a new altitude rating or establish that any particular version has passed reduced-pressure testing. Why altitude belongs in the equipment specification A machine originally built for a low-elevation factory may later be ordered for a mountain installation. Its drawing can remain identical while the environment changes. Altitude affects atmospheric conditions, and pressure matters when reviewing electrical paths through air. The local air temperature, enclosure ventilation and operating load also deserve attention. These influences must be described together rather than compressed into a single unexplained percentage. The NASA atmosphere model illustrates how pressure, temperature and density vary with height in a simplified atmosphere. It explains the physical background, not the rating of an electrical component. Actual equipment can have a different internal temperature or pressure from the surrounding weather. Record whether the switch is inside an unpressurized cabinet, a controlled enclosure or another defined environment before choosing the assessment conditions. An altitude requirement should travel with the purchase specification. If it appears only in a late installation email, the component supplier may never have considered it. The practical first step is to add the maximum intended operating elevation, the relevant pressure conditions where known, and the enclosure arrangement to...

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Blog Oct 26, 2026 LEMA Electric

Dichiarazioni sui materiali degli interruttori: richiedici dati IEC 62474 utilizzabili

A switch material declaration prepared for an IEC 62474 request needs a defined product identity, an agreed reporting scope and usable substance information. A generic statement that a switch is environmentally compliant may not contain the data a customer needs to process. Before asking the supplier to complete a file, specify the required format and edition, the reference-list version, the ordered configuration and the expected declaration type. Then check both the file's structure and the meaning of its contents. Passing a format check does not establish that the material information is complete or correct. The LEMA KW7 micro switch is the product example for this purchasing workflow. The article does not claim that an IEC 62474 XML declaration already exists for every KW7 option. Request the available data for the exact part, identify any missing fields and agree how they will be resolved. Product photographs help identify the item but cannot establish its substance composition. Define the receiving system before creating another spreadsheet Begin with the customer's actual request. Ask whether it needs an IEC 62474 declaration, an IPC-1752 format or a customer-specific worksheet. Record the accepted revision or schema version and the validation method. Sending a large amount of information in an incompatible format can leave both parties repeating work while the original request remains unanswered. IEC's material-declaration overview describes a common format for reporting and exchanging material and substance information. It distinguishes compliance and composition declarations within its described framework. Use the edition and requirements agreed for your request rather than assuming that the title of a standard alone defines every field, reporting depth or customer acceptance rule. Separate a statement from a structured declaration A short supplier...

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Blog Oct 26, 2026 LEMA Electric

Schermatura del cavo del finecorsa: diagnosticare i disturbi del PLC prima di ricablare

Limit switch cable shielding can help control interference, but it should follow a diagnosis of the complete switch-to-controller circuit. A false PLC transition may come from contact bounce, unstable actuation, a loose connection, incorrect input logic or electrical noise coupled into the cable. Identify the actual cause before changing shield connections. The correct cable route and termination depend on the controller instructions, the installation's bonding arrangement and the interference being addressed. There is no universal rule that every limit-switch shield must be connected at exactly one end. The LEMA LZ1 mechanical limit switch is the product example here. Its enclosure and actuator do not define the shield arrangement of an external cable or prove immunity of a complete PLC installation. The photographs show the intact switch beside separate cable-planning items, with no approved wiring arrangement implied. Use the exact switch terminal record and controller manual when preparing the circuit. Establish what the PLC is actually seeing Write down the unwanted event precisely. Note whether it occurs during switch actuation, while the mechanism is stationary, when a motor starts or during another machine action. Distinguish the PLC's raw input indication from a program condition or a displayed alarm. These observations help determine whether the problem belongs to the physical signal path or to the way the signal is interpreted. Start with the limit switch PLC wiring guide to confirm the intended contact path and input arrangement. Check the actual terminal identities, supply reference and selected input channel against the drawing. A wiring error should not be hidden by adding shielding or software delays. Record the original configuration so any later change can be assessed against a known starting point. Separate mechanical...

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Blog Oct 26, 2026 LEMA Electric

UL 94 per gli ingressi di alimentazione: verificare la classe di infiammabilità della plastica e i relativi limiti

UL 94 flammability evidence for a power inlet describes the behavior of a specified plastic material under defined test conditions. It does not, by itself, establish the inlet's current rating, operating temperature, insulation performance or approval of the finished equipment. When an OEM specification calls for a particular flame classification, connect that requirement to the actual resin grade, color, thickness and component configuration being supplied. A generic claim that the inlet uses flame-retardant plastic leaves important questions unanswered. This guide uses the LEMA IPZ power socket series as a product example. Its visible black housing establishes neither a resin identity nor a UL 94 classification. The illustrations follow the screw-mount IPZ-4 form shown in the product reference; they are not photographs of a flammability test. Ask LEMA for the material and approval records applicable to the exact ordered configuration before adding a flame-class claim to an equipment specification. Define which part needs the material evidence A power inlet can contain several nonmetallic parts with different functions. Identify the housing, any separate carrier and other relevant insulating parts on the actual construction record. Ask which material specification applies to each part being reviewed. Do not assume that one resin statement covers every plastic item in a wider family or an attached accessory. This identification step also prevents a common document mix-up: a supplier may provide a valid material record for a nearby component rather than the part actually ordered. Tie the response to the manufacturer's complete part number and drawing revision. If the construction is not documented at the level you need, make that a focused supplier question instead of filling the gap with an assumption about appearance. Read UL 94...

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Blog Oct 25, 2026 LEMA Electric

Interruttori di finecorsa IP67 vs NEMA 4: confrontare le evidenze prima della sostituzione

IP67 vs NEMA 4 limit switch specifications cannot be resolved by treating the two labels as equivalent. They belong to different enclosure classification systems and address different sets of conditions. Identify the actual exposure, check the scope of the rating for the ordered switch, and review the complete installed arrangement. If a purchase specification requires NEMA Type 4, an IP67 statement alone is not enough to approve a substitution. Ask for evidence that answers the original requirement, or obtain a documented engineering decision to revise the requirement. The LEMA LZ1 limit switch is the mechanical product illustrated here. Its current product page states IP66; this article does not relabel it IP67, NEMA Type 4 or Type 4X. The example shows why a buyer needs to read the actual model record instead of transferring a rating from a related family or a similar-looking enclosure. Identify which protection question you are asking Start with the machine location and operating process. Describe dust, rain, spray, cleaning, occasional immersion and any chemical exposure separately. Also record where the switch is mounted and whether its cable entry faces a likely water path. A single word such as waterproof does not communicate these conditions well enough for a supplier to assess the correct configuration. IEC 60529 defines the IP classification framework for enclosure protection. Use the applicable standard and product evidence to interpret a claimed code. An immersion-related designation does not automatically answer every question about water jets, cleaning chemicals, corrosion or a machine's maintenance procedure. Those need their own relevant requirements and evidence. Understand why a conversion chart is only a starting point NEMA's enclosure-type guide expressly limits the direction in which its comparison table...

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Blog Oct 25, 2026 LEMA Electric

RoHS e REACH per gli interruttori: verifica della documentazione di conformità del fornitore

RoHS and REACH compliance for switches should be reviewed as two separate substance-management questions. A RoHS statement does not automatically answer every REACH question, and an electrical safety approval does not replace either review. For an OEM purchase, define the destination market, the equipment application, the exact switch configuration and the evidence date. Then ask the supplier for statements that identify their scope and supporting basis. A useful response explains which ordered parts are covered and which questions still require assessment by the equipment manufacturer or importer. The LEMA KW7 micro switch is the product example in this guide. The housing, metal terminals and actuator can help identify a sample, but appearance cannot reveal its material composition or establish regulatory compliance. Request current evidence for the exact order code. This article does not declare a particular KW7 configuration RoHS compliant, REACH compliant or free of any named substance without the relevant supplier documentation. Begin with the question the document must answer A buyer often receives a single green-compliance file during quotation. Before accepting it, write down what your organization needs to decide. Is the request about restricted substances in equipment, information on substances present in supplied articles, a customer declaration format, or all of these? Assign the review to someone who understands the applicable market and product scope. The European Commission's RoHS overview describes restrictions on hazardous substances in electrical and electronic equipment. Its scope and exemptions need to be considered for the actual application. A component supplier's response supports the equipment assessment; it should not be presented as a universal approval for every finished product into which the switch might be installed. Keep RoHS and REACH evidence separate The...

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Blog Oct 25, 2026 LEMA Electric

Interruttori UL Listed e UL Recognized: verifica la certificazione corretta

UL Listed vs UL Recognized switches is a question about the scope of the approval, not simply which logo looks more reassuring. For an OEM buying a switch to build into equipment, confirm the exact component identity, the certification category, the covered electrical duty and any conditions attached to its use. A recognized component can be appropriate for an evaluated assembly, while a listing on another product does not approve every possible installation. Start with the evidence for the ordered variant, then have the equipment approval reviewed against the intended application. This guide addresses purchasing and engineering document review. The LEMA KW7 micro switch is the physical product example. Its catalogue mentions several approvals across the series; that statement is a reason to request the applicable records, rather than proof that every combination of terminals, lever, rating and operating force has identical coverage. No certification file number or unrestricted approval is inferred from the illustrations in this article. Separate the component decision from the equipment decision A switch supplier and an equipment manufacturer answer related but different questions. The supplier identifies what was manufactured and provides the documentation that applies to it. The equipment manufacturer checks whether that part fits the design, the environment and the applicable equipment evaluation. A purchasing release should connect those two decisions without treating one as a substitute for the other. UL Solutions explains component recognition as a program for parts and subassemblies used in larger certified products. Such parts have conditions of acceptability. In practical review, ask what those conditions require for the particular switch and how the equipment drawing satisfies them. Keep this evidence with the component record so a later engineer can...

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Blog 24 ott 2026 LEMA Electric

Micro Switch Temperature Rise Test: Validate the Loaded Assembly

A micro switch temperature rise test evaluates heating in a defined loaded assembly relative to a defined ambient reference. It needs more than a warm-to-the-touch judgment or a single resistance reading. Establish the exact switch, terminal connection, conductor, enclosure, current duty and acceptance basis before testing. Record temperature over time until the method's stabilization requirement is met, then compare both temperature rise and absolute temperature with the applicable limits. This guide helps OEM buyers prepare a representative test request without inventing a universal temperature limit for every micro switch. Start with the decision the test must support State whether the work is a development comparison, investigation of a field complaint, supplier qualification or a formal compliance evaluation. These purposes can require different specimens, methods and reports. A quick bench comparison can identify a suspicious connection, but it cannot automatically replace a prescribed product or equipment test. Agree who owns the test specification and who will approve the result. Identify the full switch code and drawing revision. Add terminal type, mating connector, conductor material and size, connection process and any mounting hardware that influences the installation. A result obtained with one connection cannot simply be assigned to another arrangement. The heat source might be a contact path, a loose connector, a conductor or an external component near the switch. The KW7 series page is a starting point for an inquiry about a physical switch family. The KW7 selection guide organizes the wider component review. Request the exact supported variant data and any applicable test conditions from Lemaele. Do not turn a family-level current marking or operating ambient statement into an assumed temperature-rise limit. The complete application must remain within the relevant...

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