Paper cup machine power quality should be investigated against the specified supply and a timed equipment event. A drive alarm, a controller restart or an interrupted production sequence does not independently prove voltage imbalance. Collect machine requirements and operating evidence first, then let qualified electrical personnel define the measurements needed. A useful report distinguishes measured conditions from suspected contributors.
Confirm the required electrical supply
Obtain the approved machine supply specification, electrical drawings and installation requirements. Record the actual configuration and any authorized modifications. Do not infer acceptable supply conditions from a general product listing or from another machine installed in the same building.
Use the technical documentation checklist to identify missing references. Include relevant drive and control documents for the affected configuration. Supply voltage, protection and grounding requirements must be confirmed by responsible electrical personnel; this article does not prescribe connection changes or protective settings.
Match events by time and boundary
Record exact alarms and timestamps, affected equipment and the production stage. Note whether other machines or site events were reported at the same time. Check that compared records use compatible clocks and time zones before describing them as simultaneous.
| Evidence | Required context | Interpretation boundary |
|---|---|---|
| Machine alarm | Exact code, time and operating stage | Does not alone identify supply quality |
| Site event | Equipment and timed report | Association is not a confirmed cause |
| Measurement | Location, instrument and method | Applies to the measured boundary |
| Equipment requirements | Approved supply specification | Defines the correct comparison |
| Corrective work | Authorized scope and repeat observations | Supports a qualified release decision |
A single reading may not represent an intermittent event. The qualified team should select suitable instruments, measurement locations and observation periods for the question being investigated. Preserve original data and the method rather than only a written statement that the supply was normal.
Keep measurement and repair qualified
Electrical measurements and cabinet access require the applicable safe-work procedures and competent personnel. Operators should not open panels or probe terminals to obtain evidence for a support request. Turning off a display is not proof of electrical isolation.
Use the control cabinet inspection guide to organize the authorized work and handback. Do not add a stabilizer, alter protective devices or change wiring based only on an alarm description. Suitability and installation require review of the actual system and equipment requirements.
If the event affects a named axis, retain the servo fault record. Keep component diagnosis separate from supply measurements so the same observation is not counted twice as independent proof.
Verify recovery and production disposition
Record approved work and any configuration changes. Complete required protection and function checks before a controlled restart. Compare subsequent observations with the original investigation conditions, and state the limitation if the event was intermittent and has not recurred during a short observation.
Identify product made around an interruption and follow the quality procedure for its disposition. A restored supply or cleared alarm does not automatically approve cups caught in an incomplete forming or sealing cycle. Keep equipment release and product release linked but separately documented.
Contact HANNAI with machine identity, exact event times and the qualified measurement summary. When selecting from the machine range, confirm site supply and installation requirements before finalizing the configuration.
Frequently asked questions
Does a drive trip prove voltage imbalance?
No. Use the exact alarm and qualified measurements against the actual equipment specification before assigning a supply-related cause.
Can one reading rule out every intermittent problem?
No. The observation method and duration must suit the event. Report what was measured and what remains uncertain.
Should an operator measure inside the cabinet?
Only qualified, authorized personnel should perform electrical work under the required procedure. Routine production observation does not authorize hazardous access.
What supports a recovery decision?
Documented authorized work, required electrical and protective checks, controlled operation and a separate decision for affected product.