Letzte Aktualisierung: October 7, 2026
schnelle Antwort: Treat power supply output voltage trim as a controlled OEM setting, not an unrestricted upgrade. Identify the exact supply and ordered revision, distinguish the supplier’s adjustment range from the equipment’s acceptable voltage window, approve a target with a defined measurement method, and retain the actual result and authorization. WEHO S-35-24 is a documented 24 V, 1.5 A example with a ±10% adjustment entry. The resulting 21.6–26.4 V arithmetic is not evidence that every connected device accepts that range or that full rated current is available at every setting.
Why a trim setting belongs in the engineering record
A replacement power supply can have the correct model and still arrive with a setting that differs from the OEM’s released configuration. A factory adjustment, an acceptance inspection, a maintenance intervention and a machine redesign are different events. If they are recorded as the same event, purchasing cannot reliably distinguish an approved configuration from an undocumented field change.
Power supply output voltage trim therefore has two boundaries: what the exact supply permits, and what the complete equipment permits. The first does not automatically define the second. A wide supplier adjustment range can be useful during qualification, but it is not a reason to expand the operating window of a controller, sensor interface or other downstream assembly. Nor does a nominal voltage on a component prove how the complete machine behaves during startup, shutdown or abnormal conditions.
This article addresses the documentary handoff between engineering, procurement and acceptance. It is not a live-adjustment procedure. Any energized assessment needs an approved method, appropriate protective arrangements and competent personnel. The application illustrations show isolated mechanical integration with empty supply contacts; they do not establish the electrical compatibility of the pictured equipment.
Keep three voltage records separate
Start by distinguishing the nominal output, the supplier adjustment entry and the OEM release target. The nominal output identifies the ordered variant. The adjustment entry describes a documented capability of that variant. The release target is a controlled equipment decision, supported by an acceptance method and the relevant design evidence.
For example, an OEM may record a nominal 24 V source while specifying a narrower acceptable window for an assembled machine. That narrower window must come from the machine’s requirements, not from an arbitrary assumption in a purchasing article. If no approved equipment window exists, the correct action is to obtain it before authorizing a changed setting. Do not fill the gap by copying the power supply’s adjustment limits into the machine specification.
Also distinguish an approved target from an actual reading. A target is an instruction or acceptance criterion. A reading is a result obtained from one identified sample under stated conditions. A result without its method cannot explain where the voltage was measured, which configuration was used, or whether the relevant load and environmental conditions were represented.
A bounded S-35-24 example
WEHO’s exact S-35-24 model column lists a nominal 24 V output, an output-current range of 0–1.5 A and a ±10% DC voltage adjustment entry. The exact-model dimension table gives 129 × 98 × 38 mm. These are selection facts, not a qualification record for a customer’s machine. WEHO S-35 product specifications
Applying the stated percentage to the nominal voltage gives 24 × 0.90 = 21.6 V and 24 × 1.10 = 26.4 V. Those two numbers are calculated reference limits, not measured endpoints of the photographed specimen. They must not be presented as a factory-calibration report, a recommended equipment target, or evidence of full-current performance throughout the interval.
The actual photographed specimen is marked S-35-24, DC output 24 V with the DC symbol and 1.5 A, and AC input 100–120 VAC 0.8 A / 200–240 VAC 0.45 A at 50/60 Hz. Its front has five screw contacts under a transparent cover, with a white adjustment control to the left of its separate green lens. The exact full-model nameplate is on its known right wall, and the photographed specimen has a small lower-front tracking label. It is a low-profile enclosed chassis, not a DIN-rail unit. The retained complete specification and mechanical drawing support 129 mm front-to-rear overall depth, 98 mm across the front and 38 mm height.
There are source boundaries worth recording. The complete drawing distinguishes the 129 mm overall front-to-rear envelope from a shorter local sidewall dimension; the latter is not the overall case length. The retained specification expresses a selectable family input range, while the physical nameplate has two nominal AC input lines. Those statements remain separate. The roof’s original selector warning is identity evidence, not a live operating instruction in this article. Obtain the controlled document for the ordered revision when a procurement decision depends on input selection or other conditions.
Define the equipment window before authorizing a target
Engineering should identify which requirements constrain the assembled equipment. These can include the acceptable voltage at the receiving interface, any defined harness or connector loss, configuration-dependent operating states and the equipment’s protective behavior. The applicable values belong in the equipment dossier. They cannot be inferred from a convenient supplier model or from an application photograph.
An approved target should state whether it refers to a supply-terminal reading or another defined measurement location. A difference between locations is meaningful only when the method and configuration are documented. Avoid a release instruction that merely says “increase voltage to compensate for losses.” Without a bounded design assessment, that phrase can produce different settings in different production lots and can conceal an unresolved interconnection problem.
The authorized target also needs an allowed tolerance and a disposition for results outside it. If the available supplier adjustment does not support the required equipment criterion, escalate the design or sourcing decision. Do not normalize a failed criterion by changing its wording after the sample has been tested. A different supply variant, a revised interface or another controlled design change may be needed; an undocumented trim change is not a substitute.
Make the measurement method reproducible
The acceptance record should identify the exact sample, document revision, approved target, measurement location, instrument identity and the method’s configuration. Include the relevant operating state, input condition and environmental conditions where the agreed method requires them. These fields describe how a result was obtained; they are not invented performance guarantees for S-35-24.
A useful distinction is between an incoming check and an equipment qualification. An incoming check can confirm that a supplied unit matches the order and meets the agreed incoming criterion. It does not automatically qualify all machine operating states. Equipment qualification considers the complete system and the specified conditions. Keep those records linked, but do not collapse their different purposes into one “passed” stamp.
Record the actual result rather than copying the desired target into the result field. Retain deviations, failed samples and the authorized disposition. If a re-evaluation is required, identify what changed and preserve the earlier result. Otherwise, a later reviewer cannot tell whether the equipment improved, the sample changed, or the acceptance criterion was silently relaxed.
Treat a changed trim target as a revision decision
A trim target change can originate in engineering, a supplier deviation request, production troubleshooting or maintenance. The origin does not remove the need for authorization. The change record should identify the old configuration, proposed new configuration, reason, affected equipment revision and evidence required before release.
Describe the scope carefully. A decision for one machine option or harness revision is not automatically valid for every product using the same supply model. If the approval is limited to a certain assembly, that limitation must survive the handoff to purchasing, incoming inspection and service. Generic instructions such as “all 24 V units use this setting” hide the interface assumptions that justified the original decision.
The record should also say how affected stock and service replacements are identified. Procurement needs a way to distinguish a standard supplied variant from an OEM-controlled setting. Acceptance needs an unambiguous criterion. Service needs to know whether restoring the approved configuration requires a re-evaluation. These are ownership questions; this article does not prescribe a physical adjustment operation or a universal labeling scheme.
Put the setting requirement in the RFQ and order
An RFQ should name the exact full model and the controlled document revision, then state which setting-related evidence is requested. If an OEM-specific factory setting is required, confirm that it is supported and define the acceptance deliverable rather than assuming the model suffix encodes it. Ask how the supplied configuration will be identified and how an authorized deviation will be communicated.
Separate the requested deliverable from an unsupported claim. “Provide a recorded result under the agreed acceptance method” is different from “guarantee every machine’s terminal voltage.” The former can be tied to an identified sample and method. The latter may depend on equipment conditions outside the supplier’s scope. Clear boundaries prevent a quotation from appearing to cover responsibilities that neither party has actually accepted.
For a replacement order, reference the released equipment configuration and any applicable setting record. Do not rely on a photograph of an adjustment-control position: a visual position is not a voltage result, and a previous unit’s control position is not a transferable calibration. The procurement dossier should remain understandable even if the physical control layout changes in a later documented revision.
Use application images as access evidence, not electrical proof
The adhesive-dispensing service-cubby illustration places the S-35-24 in a dry compartment beside the machine’s idle gantry and work nest. The carton-erector illustration uses a different compartment, equipment arrangement and source-supported viewing angle. Both scenes are isolated documentary examples with empty supply contacts. They help explain service access and the need to retain an identifiable configuration; they do not assert that these machines require 24 V or that the photographed supply has been electrically qualified for them.
The product’s real five-contact front, adjustment control, circular roof openings and known right-side geometry are identity evidence. Its proportions do not replace a dimensional inspection. The complete mechanical drawing remains the geometry authority for this example, while final installation dimensions and revisions require the ordered equipment documents.
A four-part release dossier
An efficient dossier separates four decisions. First, identify the exact unit and supplier revision. Second, retain the supplier adjustment entry without turning it into the equipment’s allowed window. Third, record the OEM-authorized target, tolerance and method. Fourth, link the actual result and disposition to the released equipment revision.
These records can share one controlled form, provided the fields remain distinct. A blank result must not look like a passed test, and a pending supplier clarification must not look like an approved revision. If a source conflict is unresolved, identify its owner and effect on the decision. Production should not have to guess whether “pending” means acceptable for release.
Wichtige Erkenntnisse
- Nominal output, documented adjustment capability, OEM target and actual result are separate records.
- The S-35-24 percentage example gives calculated limits, not a universal target or measured qualification.
- Preserve the exact specimen label and ordered document boundaries; do not merge inconsistent source statements.
- Define the equipment criterion and measurement method before accepting a changed setting.
- Carry the authorized configuration into purchasing, acceptance and service through revision control.
Abschluss
Power supply output voltage trim is most useful when its authority and evidence are explicit. For an OEM, the goal is not merely to obtain a preferred reading; it is to release a repeatable, identifiable configuration with an appropriate acceptance record. Use the exact supplier model as the starting point, retain unresolved revision questions honestly, and connect every approved setting change to the equipment design that supports it. Ask WEHO for the controlled model and revision information needed for the order, rather than treating a generic adjustment range as a substitute for system qualification.
Häufig gestellte Fragen
Does a ±10% trim entry mean every 24 V device can operate from 21.6 to 26.4 V?
No. The interval is the arithmetic result of applying ±10% to 24 V. A downstream device or complete machine has its own approved voltage window. The supplier adjustment entry does not replace that equipment requirement or an actual qualification result.
Can the S-35-24 deliver 1.5 A at every trim setting?
The exact model has a nominal 24 V, 1.5 A output entry. The cited documents do not establish full-current performance at every adjustment point for a customer’s conditions. Obtain the controlled revision and relevant limits before relying on a changed target.
Which setting belongs in an OEM purchase specification?
Identify the full model and ordered revision, then the OEM-authorized target and tolerance under a defined acceptance method. If an OEM-specific factory setting is requested, confirm support and the identification and result deliverables with the supplier.
Is the physical adjustment-control position a reliable acceptance record?
No. A control-position photograph is not a measured voltage result or a transferable calibration. Retain the sample identity, approved target, method, configuration, actual result and disposition.
Why are the application photographs not connected to the machine wiring?
They illustrate isolated mechanical integration, identity and service access. Empty contacts avoid implying a tested electrical pairing or a live adjustment procedure. Equipment compatibility and release criteria require separate engineering evidence.
