Hitachi VFD Connection

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Moosa,

@moosaes

Its not even enough space for squeeze a 10 AWG wire in there so I hope you are right.

What do you mean? Where do you want to squeeze a wire? Such wires are crimped, not squeezed.

For this VFD, you would need to use the ring connectors recommended as per the manual. They are available for a range of IEC 60228 wire sizes, as can be seen here (cimp tools also shown). The ones with the yellow sleeve are for 4–6 mm² (AWG 12–10).

See also

For conversion of IEC 60228 cross-section area to American Wire Gauge see here:

• Comparison of SWG (red), AWG (blue) and IEC 60228 (black) wire gauge sizes from 0.03 to 200 mm² to scale on a 1 mm grid – in the SVG file, hover over a size to highlight it

@Aiph5u

If you own the pliers model for interchangeable dies, you have a universal tool holder for almost 1000 crimping applications with optimum transmission of force due to lever action for fatigue-reduced operation. So you could also buy e.g. a Crimping die for insulated terminals + plug connectors for the ring and spade connectors

Die for ring connectors	Die for wire ferrules	Use of optional locators

that are usually needed to connect your spindle and the other power cables to your VFD (or, if you prefer, the one for the heat shrinkable sleeve connectors), and you can also buy a Crimping die for insulated and non-insulated wire ferrules for your wire ferrules which are usually needed on the signal wires of your VFD and other components like relays.

You could for example use a selection of ring connectors and grounding wire to properly ground your Onefinity CNC (How to do this).

Anyway if you just buy the pliers and one die, usually it’s much less expensive than one original Molex or Amphenol or Phoenix crimp pliers, but you get still best industry quality with a Knipex.

Of course you can always get a no name crimp pliers for $25 everywhere, but in every case, please know that you won’t do yourself any good if you don’t

• Always use a correctly matching crimping pliers / crimp die, that is made for the exact contact type you want to crimp, even when choosing a $25 model!

And please, also

• Always make sure that the wire gauge you use matches the specification on the pliers/insert! Otherwise, especially at higher voltages, there may be serious electrical problems and hazards.

Signal cables are usually 0.14 – 0.75 mm² (AWG 28 – 18) and shielded, with wire ferrules crimped to it. The color code for wire ferrules is here.

@Aiph5u

You need to look up which wires you need in your VFD manual. Then you choose and buy the wires …

@Aiph5u

with cross-sectional area according to your VFD manual (e.g. 0.14–0.75 mm² / 28–14 AWG for the signal lines) with matching wire ferrules and correct wire ferrule crimp pliers (e.g. wire ferrule crimping pliers from Knipex or crimping die for insulated and non-insulated wire ferrules for the Crimp System Pliers for exchangeable crimping dies (version with case) (version without case or the PreciForce® Crimping Pliers or the Crimping Pliers for two-hand operation). Note that wire ferrules for wires smaller than 0.25 mm² can only be crimped by Self-Adjusting Crimping Pliers for wire ferrules .

@Aiph5u

Regarding spindle cable, I always strongly recommend to buy it with the spindle from the spindle manufacturer. Reputable spindle manufacturers always offer this. Many cheap chinese spindle/VFD kit vendors offer only a loose plug and a piece of cable for making the spindle cable yourself, but I can not recommend this. In the case your budget allows only for a cheap chinese spindle kit, you can buy a spindle cable ready to use here.