I think I got some settings from CNCZone

Martin.

> so it seems only time will tell if they stand the test of time

I was impressed that my Jaguar Cub from Transwave has a four-year guarantee!

Neil

I like them as well (for the money!).

The only thing you should note is the modbus code – forget about using it with any "proper" gear, they had their own ideas about the implementation when they coded the drives and it does not "conform" with the standard.

Mark

Ian,

I am just about to buy a sinusoidal filter (load reactor) for some of mine. One machine I have two on is causing some issues due to the carrier frequency but that is about to get fixed! One item of interest is the requirement to use a filter on the output if the motor is not rated for inverter use – look on the manufacturer info and they all say the same thing, even the expensive "proper" inverters.

Mark

Ian,

Yes, the multi-motor thing was new to me also (I also came across that when I was looking into the motor reactors).

The filter (reactor) filters out the carrier frequency – or rather, smoothes it out, and this is the reason for using them on non inverter duty motors. By filtering/smoothing the carrier, the motor see's something much closer to a sine wave and is not subject to the "ringing" etc. from the square wave carrier wave.

If you read the bottom of page 12 in the Huanyang manual, it mentions the use of a filter/reactor there for long cable runs or non "dedicated" motors. Read any of the other manuals and it will be in there associated with the basic wiring/integration instructions or it will be mentioned under accessories in the manual.

Mark

PS, should have mentioned that they are designed to work over the inverter operating frequency – IE. up to 400 Hz

Edited By Mark C on 13/02/2015 20:28:41

The low torque/low Herz problem can be eased by upping PD009.

I tried it first with 5V and could stop the 125mm chuck with one hand when at 5 Hz.

It has been set to 22 V and I cannot stop chuck with two hands.

The translated manual uses more words than elsewhere to warn agaist being to greedy and put in a to high value here.Can someone here explain what is at take?

Thank You Andrew for explanation that made me understand the chinese/english manual better.

Programme step 009 sets a voltage and 006 a frequenzy.

At this point the voltage/frquenzy curve can can be made to have a kink(both directions ) or none.

Thanks, that helps. The normal volts/hertz curve below base speed (at 50Hz) is often a 1/f curve. But of course that can be tweaked, as set by the parameters. The parameters can also be used at very low frequencies where winding resistance has a disproportionate effect and the 1/f curve is no longer adequate to maintain current.

With regards to interference issues my take would be as follows. I'd agree that the VFD itself is unlikely to be affected. On the input side the lower power and/or cheaper VFDs do not have power factor correction on the input, just a rectifier and capacitor bank. So the current draw is very non-linear, creating current harmonics in the mains network. That's not good. An (COTS) external filter is needed to reduce harmonics below the regulated limits. On the output side the cables will definitely be producing radiated interference, as the signals are PWM with reasonably fast edges. The radiation can be greatly reduced by shielding the cables. Filtering is generally a bad idea on the output. Whether the shielding should be grounded at one end, or both ends, is controversial, so I'll keep my own councel on that.

If by VHF one means FM radio then I think a long or medium wave (AM) radio would be better to detect radiated emissions. An FM receiver normally has a limiter before the discriminator to ensure that any residual amplitude variations do not affect the output of the discriminator. One of the claimed advantages of FM is that it has high immunity to impulse (ampiitude modulation) noise.

Andrew