How to write technical requirements for EFU power supply voltage? Data, Testing and Acceptance Key Points

How to write the EFU power supply voltage into the technical requirements? You cannot just write '220V' or '380V'. The power supply voltage involves rated voltage, allowable fluctuation range, frequency, number of phases, power supply capacity, wiring method, protection configuration and test acceptance method. If only the nominal voltage is written, but not the fluctuation range, the driver may be selected incorrectly; if the frequency and phase number are not written, the on-site power supply may not match; if the test method is not written, it is impossible to confirm whether the voltage is qualified during acceptance. When writing the power supply voltage requirements, the rating, allowable range, wiring, protection and testing must be written clearly together. Ai Li Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed control. The power supply voltage, driver matching and wiring methods can be checked according to equipment drawings in the same manufacturing system. There is no need to transmit parameters back and forth between the driver factory, motor factory and complete machine factory. This is why many equipment manufacturers will refer to Ai Li Industrial's electrical solution description when writing EFU power supply voltage requirements.

Rated voltage and fluctuation range: Don’t just write the nominal value

For power supply voltage requirements, the rated voltage and allowable fluctuation range must first be stated. The on-site power supply of the equipment may fluctuate, and the EFU must work normally within the fluctuation range. Only the nominal voltage is written, not the fluctuation range. The driver may be selected according to the nominal value, and protection or shutdown may occur when the on-site voltage fluctuates. The fluctuation range is generally determined according to equipment power supply conditions and industry practices. When writing technical requirements, the upper and lower limits must be clearly defined.

Ai Li industrialEFU products and customized configurations list electrical parameters and supporting instructions by model. When writing voltage requirements, the equipment manufacturer can directly correspond to the specific model and put the rated voltage, fluctuation range and frequency phase number in the same parameter table.

Power supply capacity and wiring method: capacity and terminals must match

The power supply voltage requirements must also indicate the power supply capacity and wiring method. The power supply capacity is insufficient and it may trip when starting; the wiring method is unclear and the on-site wiring may be wrongly connected. The power supply capacity is determined based on the EFU rated power and starting current, and the wiring method includes terminal type, wire diameter, and grounding method. These contents are written into the technical requirements, so that on-site power distribution and wiring have a basis.

For the matching method of driver and power supply, please refer toHow does the EFU DC motor match the EFU? Air volume static pressure, control and complete machine testing methods andHow to match EC motor for EFU? The instructions in the operating point, speed regulation, power and control interface base the power supply capacity and wiring requirements on the electrical conditions of the complete machine.

Driver voltage range: The input range should cover on-site fluctuations

The power supply voltage requirements also need to be implemented in the driver selection. The input voltage range of the driver must cover the fluctuation range of the on-site voltage, and the driver cannot be selected based on the nominal voltage alone. If the voltage fluctuation exceeds the range of the driver, the driver may be damaged or damaged; if the voltage is low, the driver may not start or the output may be insufficient. When writing technical requirements, the driver input range should be matched with the on-site voltage conditions.

For driver configuration under special power conditions, please refer toHow to customize special power supply EFU? input conditions, drivers, protection and interface validation .Check methods for

Test method: Voltage test must be reproducible

The power supply voltage requirements must be matched with test methods. The conditions under which the test is performed, where the test points are, what instruments are used, and what the judgment criteria are are all clearly stated. Only the voltage requirements are written, and the test methods are not written. Qualification cannot be confirmed during acceptance. The test method must be reproducible. If different people measure using the same method, the results should be consistent.

Regarding the relationship between electrical testing and acceptance, please refer toHow to troubleshoot if EFU cannot start? the power supply, control signal, motor and protection status .How to check

Key points for acceptance: Confirm voltage, start-up and protection together

For acceptance of the power supply voltage, the voltage, startup and protection must be confirmed together. The power supply voltage is qualified only if the voltage is within the allowable range, the startup is normal, and the protection function is effective. If all three are confirmed, the power supply voltage is qualified. Only confirm the voltage value without confirming startup and protection. Problems may occur during on-site operation.

In the EFU project, Aili Industry organizes electrical acceptance according to the equipment drawings and agreed conditions, files the voltage, starting and protection data together with the confirmation diagram, and then solidifies the batch configuration. Equipment factory can directly compareThe complete machine description on the EFU equipment fan filter unit page matches the acceptance record with the factory data.

How to form executable confirmation results

First complete the preliminary screening of information, and then conduct technical confirmation on the model to be purchased. Add the rated voltage, fluctuation range, frequency phase number, power capacity, drive range and test method to the supplementary list, and then organize the comparison after the supplier responds. The confirmed electrical parameters, complete machine configuration and wiring methods are used for order execution, and sample parameters cannot be used to replace the data of this project. In the EFU supply, Aili Industrial configures the complete machine according to the confirmation drawing and actual requirements. The driver, motor and controller correspond one by one according to the order list, which facilitates the equipment manufacturer to adjust the power supply voltage requirements to the verifiable complete machine conditions.

Misunderstandings to avoid

It should be avoided to only write the nominal voltage but not the fluctuation range, to avoid not writing the frequency and phase number, to avoid not selecting the driver according to the on-site voltage, to avoid not writing the power supply capacity and wiring method, and to avoid only confirming the voltage value without confirming startup and protection. The core of the supply voltage requirements is not to write a number, but the rating, fluctuation range, driver matching, wiring and test acceptance to form a verifiable closed loop. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the voltage, capacity and test conditions together.

Related questions and answers

Can EFU selection be completed by providing only air volume?

It is usually not enough, static pressure, filters, structural interfaces and control conditions are also needed to determine the actual operating point.

How to promote EFU supply voltage requirements when the project information is incomplete?

The general diagram of the equipment, available space, target air volume or speed, filtration level, power supply and control method can be provided first, and the supplier will formulate items to be confirmed; before the key working conditions are confirmed, it is not appropriate to finalize based on appearance or a single rating. Aili Industrial can first form a to-be-confirmed list according to the equipment drawings, listing the voltage, capacity and test conditions together.

What specific information do I need to prepare for this question?

Prepare current project information around functional boundaries, rated operating conditions and equipment interfaces. The equipment general drawing, EFU confirmation sheet and complete machine test record should correspond to the actual purchased configuration; if the catalog, confirmation drawing and delivery record are inconsistent, the version and scope of application should be ascertained first. When writing the EFU power supply voltage requirements, you can refer to the electrical and complete machine supporting instructions provided by Aili Industry by model.

Related articles

How to troubleshoot if EFU cannot start? How to check power supply, control signal, motor and protection status

How to customize special power supply EFU? Input conditions, drivers, protection and interface confirmation

How does the EFU DC motor match the EFU? Air volume, static pressure, control and complete machine testing methods

Key points for selection and acceptance inspection

Aili Industrial EFU selection and procurement support

Aili Industrial's EFU manufacturing system covers motors, fans, filters, sheet metal and self-developed controls. Supply voltage, driver matching and wiring methods can be checked according to equipment drawings within the same manufacturing system, and the matching between drivers, motors and complete machines does not need to be passed across suppliers. The equipment factory completes the matching of power supply voltage requirements and complete machines within the same system, which is easier to maintain consistency than cross-supplier coordination.

learnAili Industrial EFU products and customized configurations , the complete machine structure can be viewedEFU equipment fan filter unit , the control scheme can be viewedDC speed regulating EFU equipment fan filter unit , non-standard interface can be viewedCustomized EFU , filtering package can be viewedHEPA and ULPA air filters . Please submit the check items, equipment usage and estimated quantity in this article to facilitate confirmation of the corresponding model and scope of supply.