Help needed to get my 7i76E + 7i85S + 7i73 on my mill going.

Something else must be set wrong, did test to edit speedratio but still nothing.
I can hear that motor relay is activated so it seems VFD is not getting any voltage from 7i76e output.

tecno wrote:

Hakan wrote: I think the intention was to merge your version with another version.
The speed_out pin was lost in that process.

Bengt, you need to

1. Add the speed_out pin in the gearcomp3 component

Code:

pin out float speed_out "Motor speed needed";

2. In the "if" statement at the end, add at the end

Code:

speed_out = speed/speedratio;

when the right gear is engaged, and

Code:

speed_out = 0.0;

when the wrong gear is engaged.

3. halcompile and resinstall component

4. Change the hal file to

Code:

net spindlespeed <= gearcomp3.0.speed_out => hm2_7i76e.0.7i76.0.0.spinout

]net spindlespeed <= gearcomp3.0.speed-out => hm2_7i76e.0.7i76.0.0.spinout[

PROGRESS

I think there is something wrong with speedratio that is shown as 0.18 and should be just about 1.0 or a bit less.
Some tweaking but what to change?

Attachment not found

Ok, let's look at the screen.
You have input-c high which is third gear. gearcomp3 also wants you to use third gear so that is okay.
The speedratio is chosen to 0.18 which is fine for third gear. You have enable-in high and enable-out high, so the gearcomp3 clearly thinks you have the right gear.

But speed_out is 0.0. So there must be something wrong with the code you entered. Can you copy-paste the last if-statement in the component. I tend to think you placed the calculation of speed_out in the wrong place, setting it to zero when right gear is chosen and giving it a value when the wrong gear is chosen. But lets see.

tecno wrote: Something else must be set wrong, did test to edit speedratio but still nothing.
I can hear that motor relay is activated so it seems VFD is not getting any voltage from 7i76e output.

From the figure in the previous post, speed_out is zero, so it should not run. See above.

if (inputs_sum > 0 && geartouse == gearengaged) { // Everything ok
gearshift = 0;
wantedgear = gearengaged;
speedratio = ratios[gearengaged-1];
enable_out = enable_in;
} else { // Should change gear
gearshift = 1;
wantedgear = geartouse;
speedratio = ratios[geartouse-1];
enable_out = 0;
speed_out = speed/speedratio;
speed_out = 0.0;
}
}

I moved the speed_out speed calculation to the right place. Now it should work. Remove the arrow.

OK, will go down to the workshop and try y´this out now.

I think I still prefer my switch{} as a way to determine the gear, it can detect invalid combinations.

It might be better to multiply by speedratio, just so that there is no chance of a divide-by-zero if a config mistake makes speedratio=0

You have a good point. The way it is done now is not very error-proof.
One way to ensure only one input is active is to
if (input_a + input_b + input_c + input_d + input_e != 1) .......

I also have a feeling there are other erroneous combinations possible,
especially in combinations with the Glade input that is coming.

I don't mind if like you to bring back the switch-case.

OK, it works but does not work correctly. S445 spindle is moving very slow due to speedratio.

first of all I have been misleading myself as well as you guys as regards rpm range.

This mill has a 2-speed 3-phase motor (Dahlander type)

So there is 2 ranges for the motor where now only the higher speed is active in my setup just now.
So in effect this gives 255 to 2500 rpm and if motor is switched to low speed 125 to 1250



So if I want the whole range I need to implement the low speed relay and I will do that as I want the whole range + some extra.
Honestly I don´t think if motor is in high speed to try to crank it down that much via VFD that I wanted is good for the motor as it surely will overheat.

So back to the drawingboard.

Can I suggest reading about using VFDs with Dahlander motors?
There are things to consider. (One of which is that Dahlander-wound motors are generally quite old).

I think that it might work better to run the motor at 100Hz in low mode than 25 Hz in high mode.

If you choose to use both then you need to avoid re-arranging the windings with the VFD enabled.