Knowledge Hub

Technical and product information relating to our catalogue of MEAN WELL, VOX, EUCHIPS, ELED and Ecopac products.

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Safety Standard

What is RoHs?

RoHS is the acronym for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in th…

24/09/20

Technical Question

What is the input voltage of the ELG series?

The ELG series will work off an input voltage of 100-305Vac, however output de-rates to 70% below 200Vac. Please refer …

21/09/20

Technical Question

How to select the correct circuit breaker or fuse for MEAN WELL SPS?

At input side, there will be a large transient inrush current during the power on of an SPS. The inrush current is usua…

21/09/20

Technical Question

Would it be possible to reduce the noise of a fan?

Noise is directly related to the fan which is build into the power supply. Lowering the airflow of the fan means reduci…

21/09/20

Technical Question

During the operation of your power supply, there is some leakage current on the case. Is this normal? Will this leakage current hurt the human body?

Due to the requirement of EMI, there will be some Y capacitors between line and neutral to the FG (case) to improve EMC…

21/09/20

Technical Question

The output ground (GND) and frame ground (FG) is the same point in my system, can MEAN WELL's power supplies be used in such system?

Yes. Since our products are designed based on isolation concept, it will be no problem that the output ground (GND) and…

21/09/20

Technical Question

If we need a 600W output, can we use two units of S-320 connected in parallel?

No, you can not do this connection because S-320 is not equipped with the parallel function. When two power supplies ar…

21/09/20

Technical Question

If we need a 24V output power supply, can we use two 12V power supplies connecting in series instead of one 24V power supply?

YES, basically you can do this to get the right output voltage, but be careful that the rated output current of the ser…

21/09/20

Technical Question

How do we choose a power supply to charge a battery?

MEAN WELL has ESC, SC, PA, PB series for battery charger purpose (120~360W). If these series does not meet customers' d…

21/09/20

Technical Question

I have an TN-1500 inverter. Why is the LED indication of AC IN not lit after mains input has been applied?

According to the mains voltage of different countries, the output of TN-1500 inverter 110VAC version can be altered to …

21/09/20

Technical Question

What is the fan control mechanism for SPS with cooling fan?

Cooling fans have a relatively shorter lifetime (typical MTTF, Mean Time To Failure, of around 5000-10000 hours) as com…

21/09/20

Technical Question

In MEAN WELL's catalog, we see AC and DC at input, what does this mean?

Due to different circuit designs, MEAN WELL power supply's input consists of three types as below:(√2VAC≒VDC)a.85~264VA…

21/09/20

Technical Question

What is the difference between -V and COM which are marked on the output side?

COM (COMMON) means common ground. Please see below: Single output: Positive pole (+V), Negative pole (-V) Multiple outp…

21/09/20

Technical Question

What is PFC?

PFC stands for Power Factor Correction. The purpose of PFC is to improve the ratio of apparent power and real power. Th…

21/09/20

Technical Question

What is "Inrush Current"? and What will we notice?

On the input side, there will be (1/2 ~1 cycle, ex. 1/120 ~ 1/60 seconds for 60 Hz AC source) large pulse current (20~6…

21/09/20

Technical Question

Why is the fan is not running after turning on certain models?

Some models control the fan based on internal temperature to extend its life time. For example, the Fan ON temperature …

21/09/20

Technical Question

Why did the power supply shut down during operation and after turning it off, I can't restart the power supply again?

In general there are two circumstances that will cause the power supply to shut down. The first one is the activation o…

21/09/20

Technical Question

When testing a dual output power supply, the +5V channel is correct, but the +12V channel is over the specification. What is going on?

There are some minimum-load requirements on MEAN WELL's multi-output power supplies, please refer to the specification …

21/09/20

Technical Question

Can MEAN WELL's power supply be used in the range of 45Hz ~ 440Hz? If YES, what will happen?

MEAN WELL's power supply can be used within this frequency range. But if the frequency is too low, the efficiency will …

21/09/20

Technical Question

How do MEAN WELL test for Electro Magnetic Interference (EMI) ?

This statement defines the EMI test setup and load style of MEAN WELL’s enclosed type and PCB type power supply referri…

21/09/20

Safety Standard

Safety Standards

EN 50172Requirements for emergency escape lighting systemsEN 50294Measurement method of total input power of ballast-la…

09/09/20

Technical Question

How to select a LED driver to DIM LED Strip?

Common undesired behaviors when dimming an LED It sounds to be an easy task to dim a light source. Actually there are s…

06/06/19

Technical Question

Can MEAN WELL chargers be used in conjunction with a Lithium battery or other type of battery?

All MW chargers are designed for lead-acid batteries. Every Lithium battery or other type of battery will have its own …

06/06/19

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