# What is needed to wire up 2.2kw 220v Spindle and VFD? **URL:** \ **Category:** Spindle/VFD (Aftermarket/Unsupported)\ **Created:** [February 11, 2022, 5:07pm UTC](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123 "2022-02-11T17:07:26Z")\ **Posts on this page:** 1\ **Showing post:** 22
**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\ **Post date:** [August 26, 2022, 4:04pm UTC](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123/22 "2022-08-26T16:04:33Z")
Hey David, > [@Arzt](#): > > In: L1, N and a metal post (ground). > The 220 service in my wall has four wires. Black, red, white and ground. The cords I see on YouTube have only three (Black, white, green). I assume that folks cut off the female end of an extension cord, and secure B-W-G to L1, N and the post (respectively). I assume that you received a VFD for single-phase input and for the 200 V voltage class. Furthermore I assume that you are in [North America](https://en.wikipedia.org/wiki/Mains_electricity_by_country) which would mean you probably have [Split-phase electricity](https://en.wikipedia.org/wiki/Split-phase_electric_power), which means 120 V between one hot and neutral, and 240 V between two hots of different phases. Therefore you have to connect the both inputs L1 and N of your VFD to two hots of your wall box, and ground to ground. Note that you do not connect anything to your neutral, I repeat nothing, since you want to use your 240 V and not your 120 V. As for **identifying the wire colors** , here you see the international colcors and those common in North America: > ![Electrical_Wiring_-_Colour_coding of wiring by region_EU_vs._USA_vs._Canada](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/a/7/a7240c80412c17f9ac848f137b6d38ad9ce83eb8.png) > > – Source: [Electrical wiring # Colour coding of wiring by region – Wikipedia](https://en.wikipedia.org/wiki/Electrical_wiring#Colour_coding_of_wiring_by_region) Okay when we lookup in the table above, so in the USA: Black is Hot (Phase 1) Red is Hot (Phase 2) White is Neutral, and Green is Ground. So what you want here, is to connect a single-phase VFD to a single phase 240 V power source which you find on your two hots of different phases. Therefore you wire your **Black** (Hot1) ----\> **L1** on VFD, **Red** (Hot2) ----\> **N** on VFD (sic!), **White** (Neutral) to **nothing** (important, since you don’t want any 120 V here), and finally **Ground** ----\> **Ground** on VFD/EMI filter. #### Selecting wire and fuse size Now for choosing the wire strength. The wire is always dimensionated according to the [current](https://en.wikipedia.org/wiki/Electric_current). If you want to know what current your VFD will draw, you take a look at the VFDs nameplate, and look into the [VFD manual (PDF)](https://automation.hitachi-industrial.eu/_Resources/Static/Packages/Moon.HitachiEurope/Downloads/automation/%5B3%5D%20Manuals/%5B1%5D%20Inverter/%5B4%5D%20Standard%20Drive/%5B1%5D%20S1/English/S1%20Series_Basic%20Guide_EN.pdf): ![Hitachi_S1-00130SFE_nameplate](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/e/2/e2bfd008e52c5db3a5b7737184062b4b8f9714d3.png) _Image 1:_ Nameplate of the Hitachi VFD model S1-00130SFE: **24 A** input in normal duty (ND) mode. ![Hitachi_S1_manual __Rated_value__ 2.2_kW_model_highlighted](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/8/853132b5704685089045f01355c1b0fdcec513e2.png) _Image 2:_ Excerpt from the Hitachi S1 manual: For model S1-00130SFE: **24 A** input in normal duty (ND) mode. If you think, why is that so high, note that if you have a VFD with single phase input (which is necessarily the case here if you have [Split-phase electricity](https://en.wikipedia.org/wiki/Split-phase_electric_power)), then _all the power has to be provided over the single phase_, which means it draws more than double the current on one input wire than it would if you had a VFD which receives power over a three-phase input. Therefore usually you would always prefer a VFD for [three-phase electricity](https://en.wikipedia.org/wiki/Three-phase_electric_power) (that’s what is common here in Europe), since you would not need such thick wires and such a strong fuse, but unfortunatly three-phase electricity is rare in North America. Now for wire and fuse size. I noticed you don’t have a table for the wire sizes in your VFD manual. But you can take the table I provided above in this thread (search for 200 V class, Single phase input, CT mode, 2.2 kW motor output): > [@349iq2345](#): > > In my VFD manual, it says: > > > ![Omron_MX2 __2-3-6__ Determining_Wire_and_Fuse_Sizes_P045_pdf071__cropped_v2](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/a/a3e0d9a359d77637444cbf6d8dc96b282fc2a6c9.png) > > > > – Source: [Omron MX2 User’s Manual](https://assets.omron.eu/downloads/manual/en/v5/i570_mx2_users_manual_en.pdf) So for your 2.2 kW 200 V class VFD with single input, which draws up to 24 A (=5.7 kVA) input in normal duty (ND) mode (as shown from your VFD manual and on your VFD nameplate), you would need a three-wire (2+[PE](https://en.wikipedia.org/wiki/Earthing_system)) 10 AWG cable. > [@Arzt](#): > > The cords I see on YouTube have only three (Black, white, green). I assume that folks cut off the female end of an extension cord, and secure B-W-G to L1, N and the post (respectively). I don’t know what is shown on youtube but you need a three-wire (2+[PE](https://en.wikipedia.org/wiki/Earthing_system)) 10 AWG cable as described above. I don’t know if you want to connect your VFD installation directly to your wall box or to a plug, but in the latter case the correct plug/socket would be [NEMA 6-30](https://en.wikipedia.org/wiki/NEMA_connector#NEMA_6) or [NEMA 14-30](https://en.wikipedia.org/wiki/NEMA_connector#NEMA_14) in the USA. > [@Arzt](#): > > Out: Y-connectors on short wires. > These connect to the VFD posts, L and N. But what about that ground? Do I run a continuation of the “In” ground to the VFD ground? Secure both devices to the same (metal) box? (The mounting holes of the two devices don’t align with each other). How to attach the EMI filter and the VFD to the power is already answered [above](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123/11). Well if the mounting holes of the EMI filter and of the VFD don’t align, then Mechatron probably went out of Hitachi WJ200 and Omron MX2 (which exactly match to be mounted on top of the EMI filter). At the time I bought my spindle, they sold the Omron MX2 with it, but due to the worldwide suppliers problem, many VFDs ceased to be available. But that does not matter, you don’t forcibly have to mount the VFD on top of the EMI filter, you secure both the EMI filter and the VFD to the mounting plate of your [control cabinet](https://forum.onefinitycnc.com/t/hey-is-this-your-vfd-enclosure/10130/3) side by side, as Mechatron does too by the way, as shown here: ![Mechatron_Control_Cabinet_AB022-HF-V1-ATC](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/5/5aa2a0be31d1796e5c75194e4add9ac475596a25.jpeg) Regarding the shielded spindle cable, its shield should be **clamped to ground** (see picture below) or grounded with a **[grounding cable gland](https://products.lappgroup.com/online-catalogue/cable-glands/skintop-cable-glands-nickel-plated-brass-metric/emc/skintop-ms-m-brush.html)**. > [@Arzt](#): > > 1. Mechatron’s “Quick Start Guide” also describes a cable clamp for the “motor cables”. The image seems to show one wire within a non-metallic coat, surrounded by a web of fine metal (shield). They say to use an EMC clamp “close to the inverter”. But the purchase included a cable to the motor composed of four wires, each with its proper connection within the VFD. Where is this cable clamp intended to go? Where the four wires have to go should be clear: > [@349iq2345](#): > > > ![Omron_EMC_Grounding_Installation](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/8/8089dd375678200b80a426f601150b414ea14b83.png) > > Both earth portions of the shielded cable must be connected to the earth point by cable clamps.¹ > > > > – Source: [Omron MX2 User’s Manual](https://assets.omron.eu/downloads/manual/en/v5/i570_mx2_users_manual_en.pdf) 1) > [@349iq2345](#): > > PS2: Note that the shield cable clamp on the spindle’s end of the cable is already there inside the [Phoenix M17](https://www.phoenixcontact.com/en-us/products/circular-connector-cable-side-st-3es1n8a8005-1624537) connector of your [spindle](https://www.mechatron-gmbh.de/fileadmin/user_upload/Datenblatt_HFS-8022-24-ER20.pdf) cable. The four wires of your shielded spindle cable go to U,V,W and [PE](https://en.wikipedia.org/wiki/Earthing_system) (⏚, ground) of your VFD, and the shield of the shielded spindle cable should be **clamped to ground** (see picture) or grounded with a **[grounding cable gland](https://products.lappgroup.com/online-catalogue/cable-glands/skintop-cable-glands-nickel-plated-brass-metric/emc/skintop-ms-m-brush.html)**. You should have **one central grounding point** , which usually is on the _mounting plate_ of your [control cabinet](https://forum.onefinitycnc.com/t/hey-is-this-your-vfd-enclosure/10130/3). You attach both, the VFD and the EMI filter, on this mounting plate, and the shield of the spindle cable somewhere onto this mounting plate too, near to the VFD. See the image below. > [@Arzt](#): > > The image seems to show one wire within a non-metallic coat, surrounded by a web of fine metal (shield). They say to use an EMC clamp “close to the inverter”. But the purchase included a cable to the motor composed of four wires, each with its proper connection within the VFD. Where is this cable clamp intended to go? Don’t you have access to the shielding of the spindle cable? As I make my own cables, I don’t know how the cables Mechatron manufactures exactly look like. Can you provide a photo of the end that goes toward VFD? > [@349iq2345](#): > > ![Hitachi_WJ200_Manual __D-5__ Installation](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/2X/9/9a084589d5386356c89616127e9ff37df33e3a34.png) > [@Arzt](#): > > - The Mechatron Quick Start Manual shows a Hitachi S1 VFD, but the page is labeled, “Frequency Inverter Omron MX2”. Aiph5u noted the ModBus addresses for the S1 and Omron differ. Maybe that doesn’t matter in the wiring set-up? No, it doesn’t matter. > [@Arzt](#): > > Mechatron’s manual for connecting to the CNC controller describes nine links: > S1, S2, COM, AI2, R01B, R02C, H1, H2 and +24V > It doesn’t refer to the two RS485 connections that (I thought) are the communication lines. Is Mechatron’s R01B (Digital Input) also called “RS485-”? Is Mechatron’s S1 or S2 (both Digital Output) also called “RS485+”? Or is AI2 (Analog output) actually the RS485 connection? To connect your Hitachi S1 VFD to the Onefinity CNC Controller, you just need to connect > [@349iq2345](#): > > the pin “485+” on your VFD to pin 13 on the Onefinity [25-pin I/O port](https://buildbotics.com/manual-v1-0/#25pinioport) and pin “485-” to pin 14 using a [twisted pair cable](https://en.wikipedia.org/wiki/Twisted_pair), you should get an “OK” on the [“ModBus status” field](https://buildbotics.com/manual-v1-0/#modbusstatussection). The [RS-485](https://en.wikipedia.org/wiki/RS-485) port on your VFD is located here: > ![Hitachi_S1_Logical_Terminals_RS485_port_highlighted](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/c/c/ccd34774ecbcaa6e1d2c5640adabb9309ed5f797.png) > > – Source: [Hitachi S1 Series Basic Guide (PDF)](https://automation.hitachi-industrial.eu/_Resources/Static/Packages/Moon.HitachiEurope/Downloads/automation/%5B3%5D%20Manuals/%5B1%5D%20Inverter/%5B4%5D%20Standard%20Drive/%5B1%5D%20S1/English/S1%20Series_Basic%20Guide_EN.pdf) The connections you listed are some digital and analog control lines witch which you can control the VFD in case your CNC controller has no RS-485 / ModBus interface, e.g. as with Masso controllers. But if your CNC controller has a RS-485 / ModBus interface (which is the case with Buildbotics and Onefinity controllers), you need nothing else to let it control the VFD than these two wires. The Onefinity Controller will also stop the spindle over RS-485/ModBus when entering “estopped” mode. Another topic would be automatic dust collector and coolant pump switching, which I tried to summarize [here](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123/18) --- _[View the full topic](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123)._