A Japanese machine can arrive in perfect condition and still not be usable on the day it is unpacked. Its main motor may be fine on your supply while the coolant pump overheats. The control transformer may hum. Or the local inspector refuses to let it run, because nothing on the machine shows it meets the rules in your country. None of these is a fault in the machine. Each one is a mismatch that could have been found from the nameplate and the electrical drawings while the machine was still in Japan.
This article covers the electrical side end to end: the Japanese supply the machine was built for, what changes on yours, the choice between a transformer and a drive, and how to confirm conformity in the importing country.
💬 Have a Japanese machine in view and not sure it will run on your supply? Send us the nameplate photos and the electrical drawings, and we will put the questions to the seller in Japanese. Tell us about the machine.
What supply was the machine built for?
Japan supplies electricity at standard voltages of 100 V and 200 V, at 50 Hz in the east and 60 Hz in the west, so a Japanese industrial machine is very often built for a 200 V class supply at one frequency or both.
Two facts from primary sources set the baseline:
- Voltage. The Ordinance for Enforcement of Japan’s Electricity Business Act, Article 38, sets the values utilities must keep at the point of supply. For a 100 V standard voltage, the value must stay within 6 V either side of 101 V. For a 200 V standard voltage, it must stay within 20 V either side of 202 V.
- Frequency. Eastern Japan uses 50 Hz and western Japan 60 Hz. The two grids are linked only through frequency-converter facilities. This is how METI’s own energy education material describes it.
Which side of Japan a used machine ran in tells you only what it was connected to. The nameplate tells you what it was designed for. A machine marked “200V 50/60Hz” was built to accept either frequency. One marked with a single frequency may have been built for that region only. Where the boundary runs, and how to read a region from a seller’s address, is covered in what to check before buying used equipment in Japan.
Checked against the Ordinance (e-Gov law search) and METI material on 19 October 2026.
Read the machine, not just the nameplate
The main nameplate gives one rating for the whole machine, but the problems usually sit in the smaller parts inside it, so ask for the electrical drawings and the parts list and check every frequency-sensitive part separately.
A machine tool or a moulding machine is a collection of electrical loads. Some care about frequency and some do not. The table below is the checklist we put to a seller.
| Part inside the machine | What a change of frequency or voltage does | What to ask for |
|---|---|---|
| Spindle or main drive on an inverter (variable-frequency drive) | The drive makes its own output frequency, so the incoming frequency usually matters little if the input range covers your supply | Drive model and its rated input voltage and frequency range |
| Induction motors connected straight to the supply (coolant, hydraulic, lubrication pumps, fans, conveyors) | Speed follows frequency. On 60 Hz a motor runs at six-fifths of its 50 Hz speed, and a pump or fan driven faster draws more power | Each motor’s rated voltage, frequency and current |
| Control transformer inside the panel | A transformer designed only for 60 Hz can overheat on 50 Hz | Transformer rating plate, including frequency |
| Contactor and relay coils, solenoid valves | Rated for a coil voltage and sometimes a frequency. A mismatch causes chatter, heat or failure to pull in | Coil ratings from the parts list |
| Heaters (barrel, furnace, ovens) | Output depends on voltage, not frequency. A higher voltage on a resistive heater raises its power | Heater rated voltage and power |
| Timers, clocks and older control electronics | Some older designs count mains cycles. On the wrong frequency they run fast or slow | Whether any timing depends on the supply frequency |
| Power supply units for controls (DC) | Most switch-mode units accept a wide input range | Input range on the unit’s label |
A 50 Hz machine moved to 60 Hz is the riskier direction for directly connected pumps and fans, because they speed up and take more load. A 60 Hz machine moved to 50 Hz is the riskier direction for transformers and some coils, because lower frequency at the same voltage drives the iron harder. Neither is a rule of thumb you can apply blind. The parts list decides.
Transformer, drive or re-wiring: choosing the fix
A voltage mismatch is usually solved with a step-down or step-up transformer; a frequency mismatch on directly connected motors needs those motors changed, re-rated or put on drives; and the cheapest fix that works is the one confirmed in writing by the maker.
| Mismatch | Usual fix | Watch for |
|---|---|---|
| Voltage only, same frequency | Isolating or auto-transformer between your supply and the machine | Size it for the machine’s full load and starting current. Check the earthing arrangement on the secondary side |
| Frequency only, machine already inverter-driven | Often nothing beyond confirming the drive’s input range | Directly connected auxiliary motors and the control transformer still need checking |
| Frequency on directly connected motors | Replace with motors rated for your frequency, re-rate pulleys or pumps, or fit drives | Changing a motor can change the machine’s guarding, wiring and conformity, see below |
| Both voltage and frequency | A transformer for the voltage, plus one of the frequency fixes | A transformer does not change frequency |
| Whole-machine frequency conversion | A static frequency converter for the whole machine | Usually a last resort. Size and cost rise with the load |
Ask the maker, through the seller, whether the model was also sold in a version for your supply. Some makers build export versions of a model with different motors and transformers. If one exists, the maker can tell you which parts differ. That list is far more reliable than a local electrician’s guess, and it often costs less than converting the supply.
💬 Want the maker’s own answer on converting a machine to your supply? We can ask in Japanese and get the parts list for the export version, where one exists. Ask about a specific model.
Conformity in the importing country: CE, US and others
Whether a machine may be put into service depends on the importing country’s own rules, not on Japan’s, so identify the regime that applies and who carries the duties before you buy. A conversion done after purchase can make you the party responsible for conformity.
The rules differ by country, and we do not summarise them all. Two common regimes show what to look for.
The European Union. Machinery placed on the EU market today falls under the Machinery Directive 2006/42/EC. The new Machinery Regulation (EU) 2023/1230 applies from 14 January 2027, and the Directive is repealed with effect from the same date (Articles 51(2) and 54). Three provisions of the Regulation matter most to a buyer of Japanese machinery:
- Importers have duties of their own. Under Article 13(3), the importer’s name, registered trade name or trade mark and postal address must appear on the machinery, or on its packaging or an accompanying document where that is not possible.
- Instructions in the user’s language. Article 10(7) requires the instructions and safety information to be in a language users can easily understand, as decided by the Member State concerned. The instructions may be provided in digital format. Article 13(4) makes the importer responsible for making sure they accompany the machine.
- Modifications can make you the manufacturer. Article 18 treats a person who carries out a “substantial modification” as the manufacturer, with the full duty to ensure and declare conformity. Article 3(16) defines that as an unforeseen change, after the machine has been placed on the market or put into service, that creates a new hazard or increases an existing risk. Swapping motors or adding a transformer needs to be assessed against this before you do it, not after.
The United States. Under OSHA’s general-industry electrical rules, equipment in a workplace is acceptable only if it is “approved” (29 CFR 1910.303(a)). The definitions in 1910.399 give three routes:
- Listing, labelling or certification by a Nationally Recognized Testing Laboratory (NRTL) recognised under 1910.7.
- Where no NRTL accepts that kind of equipment, inspection or testing by another federal agency or a state or local authority.
- For custom-made equipment, the manufacturer’s own determination, based on test data the employer keeps.
A Japanese machine with no NRTL mark is therefore a question to settle before it ships, not after it is installed. “UL” is the mark buyers ask for most often, but it is one NRTL’s mark among several, and the requirement is approval, not a particular logo.
Everywhere else. Ask your authority or a local electrical inspector three things. Which standard does it inspect machinery against? Does it accept the international machine-electrics standard IEC 60204-1 (Safety of machinery – Electrical equipment of machines – Part 1: General requirements) as evidence? And does a used machine need certifying before it is put into service? Do this before you pay. A machine without the right mark may still clear customs and then sit idle.
| Regime | What decides acceptance | What to get from Japan before shipment |
|---|---|---|
| EU (Directive 2006/42/EC, then Regulation (EU) 2023/1230 from 14 January 2027) | Conformity with the EU rules, declared by the manufacturer, or by whoever substantially modifies it | Whether the model was ever sold with CE marking, the EU declaration of conformity if so, instructions in the required language |
| United States (29 CFR 1910.303 and 1910.399) | “Approved” equipment, usually through an NRTL | Whether the model carries an NRTL mark, and the electrical drawings for any evaluation |
| Other countries | The importing country’s own regulation and the inspector’s practice | Electrical drawings, parts list with ratings, test records |
Checked against the published texts on EUR-Lex, the OSHA regulations pages and the IEC webstore on 19 October 2026.
Nameplates, panels and manuals in Japanese
Expect the nameplate, the operator panel, the warning labels and the manual to be in Japanese on a machine built for Japan, and plan the translation as part of the purchase, because several regimes require instructions and safety information in the user’s language.
What usually needs attention:
- Warning labels on the machine. These are the ones an inspector notices first. Ask whether the maker supplies them in English or your language for this model.
- The operator interface. Many control systems can switch their display language, sometimes only with an option the maker enables. Ask before purchase. Switching after delivery may need a visit from the maker’s service engineer.
- Manuals. Ask for the original Japanese manual and any English edition the maker publishes. A translation made locally from the Japanese original is better than none. It is not the same as the maker’s instructions, so keep both.
- Electrical drawings. These are what your electrician and any inspector will work from. They are often only in Japanese, but symbols and part numbers carry across languages.
- Year of manufacture. It is often given in the Japanese era. Have the seller confirm the Western year in writing, because import age limits are counted from it.
For a used machine bought from overseas, where to find the machine and how to check the seller are covered in buying used Japanese machinery from abroad. Installation and commissioning, including who connects the machine to your supply, are covered in installing Japanese machinery abroad.
💬 Want the electrical check, the maker’s answers and the translations handled before the machine leaves Japan? Sunsho Trade sources machinery from Japan and works with makers in Japanese. Contact us about sourcing from Japan.
Frequently asked questions
1. Can a Japanese 200 V machine run on my factory’s supply?
Usually yes, through a transformer sized for the machine’s full load and starting current, provided the frequency also suits every frequency-sensitive part. Japan’s 200 V standard is held within 20 V either side of 202 V at the point of supply, so compare the nameplate with what you actually measure on site.
2. Does a transformer fix a 50 Hz and 60 Hz mismatch?
No. A transformer changes voltage, not frequency. A frequency mismatch is solved by confirming the machine is inverter-driven, replacing or re-rating directly connected motors, or, as a last resort, converting the supply for the whole machine.
3. Is a machine from western Japan always a 60 Hz machine?
No. Many Japanese machines are built for both 50 Hz and 60 Hz. The region tells you what the machine was connected to, and the nameplate and parts list tell you what it was designed for.
4. Do I need CE marking to use a Japanese machine in the EU?
Machinery placed on the EU market must meet EU machinery rules, now Directive 2006/42/EC and Regulation (EU) 2023/1230 from 14 January 2027. Whoever substantially modifies a machine becomes responsible as manufacturer under Article 18. Confirm the position for your specific machine before you buy.
5. Does my machine need a UL mark to be used in the United States?
OSHA requires workplace electrical equipment to be “approved”. In practice that usually means a mark from a Nationally Recognized Testing Laboratory, of which UL is one. Other routes exist for equipment no NRTL accepts and for custom-made equipment (29 CFR 1910.399).
Sources: Ordinance for Enforcement of the Electricity Business Act, Article 38 (e-Gov law search); METI energy education material on 50 Hz and 60 Hz supply; Regulation (EU) 2023/1230, Articles 3(16), 10(7), 13(3)–(4), 18, 51(2) and 54 (EUR-Lex); 29 CFR 1910.303(a) and 1910.399 (OSHA); IEC 60204-1 title page (IEC webstore). Checked on 19 October 2026.
More industrial sourcing guides: Buying Used Japanese Machinery from Abroad: The Full Route · Buying New Japanese Machine Tools from Overseas, Step by Step · Japanese Packaging and Food Machinery: Test, Hygiene, Parts. All guides by category are on the industrial sourcing page.