Delivery of the Elite Series Machines

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

Hey Andreas,

the way spindles (induction motors) are driven is not with neutral, and the VFD provides no neutral. The windings of the stator are between U,V,W.

– Source: Omron MX2 User’s Manual

What is crucial for safety in a spindle motor cable is the fourth wire, which is the protective earth (PE) wire! Never should one connect a spindle without this wire that should be connected to VFD ground (⏚) and the VFD grounded in a grounded wall outlet.

@Aiph5u

@Aiph5u

You will need shielded 3+PE cable for the three phase spindle. Cables especially made for drag chains are e. g. LAPP ÖLFLEX® CLASSIC FD 810 CY or IGUS chainflex®.

I use LAPP ÖLFLEX® CLASSIC FD 810 CY , in the strength 4 x 2.5 mm² (LAPP #0026271) for the 2.2 kW spindle or 4 x 1.5 mm² (LAPP #0026251) for a 1.5 kW spindle (=shielded 3+PE ).

@Aiph5u

• On the output of the VFD, i.e. the spindle cable, you should use shielded 3+PE for the three-phase spindle, like shown here:

Image 1: A typical spindle cable for use in a power chain (LAPP ÖLFLEX® CLASSIC FD 810 CY )

See this thread for more information.

@Aiph5u

Note that even if PE wire and cable shield are both connected to ground, they serve two different purposes. PE is crucial for electrical safety, and shield cannot replace the PE wire!

Therefore the reference to “16/3” in the topic’s title is dangerous: NEVER connect a spindle without a PE wire ! Shield cannot replace a PE wire!

When talking of poles on a spindle, this has nothing to do with the pins on the connector. What is meant is the number of coil groups on the stator. Most spindles used in this forum have two magnetic poles, which means at 400 Hz they run with 24,000 rpm. A spindle with four magnetic poles a runs at 12,000 rpm when driven with 400 Hz. For 24,000 rpm it would require 800 Hz then.

Two magnetic poles	Four magnetic poles

See here for pole number/frequency/rpm computation on your spindle/VFD.

For difference of hand trim router vs. spindle performance see here.