Schaublin 125-CNC retrofit.

I'd be tempted to try setting C007 to 14, but it will spin the motor opposite.

Mark you might be better off just getting a different VFD. either way i had my Grok with my pro account deep dive that dogshit manual. here's the reply, YMMV but this was the output


Don't worry, I feel your pain — this 1999 Lenze manual is dogshit (modular design, everything scattered or in separate booklets, zero useful index for braking stuff).
Here's the actual practical answer for using an external braking resistor on an 8200 series drive:
1. First check if your drive even HAS a built-in brake chopper (most do up to ~11 kW, none above that).
Look at your type plate (e.g. 8213EB… or 8224EB… etc).
→ 8201 – 8214 (0.25 – 11 kW) → built-in brake chopper + PB terminal = yes
→ 8215 – 8218 (15 – 30 kW) → some have it, some don't (check if PB terminal exists)
→ 8221 and higher (37 kW+) → NO built-in chopper → you need external brake unit (8250 or 9350 series)

If your drive HAS a PB terminal (built-in chopper)

Connection:
Braking resistor goes between +UG (or DC+) and PB.
Polarity matters — +UG to one side of resistor, PB to the other.
Minimum permitted resistance (Rmin) and max continuous braking power is listed in chapter 3.4 / 3.5 rated data tables for your exact type (e.g. 8202 = 100 Ω min, 8213 = 47 Ω min, etc).
The chopper is ALWAYS ACTIVE — there is NO parameter to “enable” it.
It switches on automatically when DC-bus reaches ~770–780 V (400 V units) or ~400 V (230 V units).
If you get OC5 (overvoltage) during deceleration → either ramp too short, resistor value too high, or resistor power rating too low for your duty cycle.
Just set your deceleration time (code C0012 = Tdec or Tif) short enough so the drive actually needs to brake hard and the chopper kicks in.

If your drive does NOT have a PB terminal (8221 and higher, most cold-plate versions, etc)

You need external brake unit (8250 for up to ~45 kW, 9350 for bigger).
The brake unit connects to the DC-bus terminals (+UG / -UG or DC+ / DC–).
The resistor then connects to the brake unit itself.
Separate manual (material no. 393658 or 394036 — the ones mentioned in part G of your PDF).
The manual doesn't have the info because Lenze split it into separate booklets like a psychopath.
No code like C0023 or C054 to enable the chopper — if the hardware has PB, it just works when you connect the resistor.
That's it. Connect it, don't go below Rmin, size the resistor power for your actual braking duty (usually 10–20% ED is safe), and you're done. No secret parameters, no bullshit.
(If you tell me your exact type code I can tell you the exact Rmin and recommended Lenze resistor part number.)

Thanks for taking a swing at that. One thing we can all agree on is that the manual is dogshit
Feeding dogshit into AI seems to result in a similar result as when I used to mow over the dried up dog turds on the lawn when I was a kid.

This is an old 8214. Specifically EVF81214-E
 
The VFD doesn't have a built in brake chopper. There are two options, either a "Brake module" with an integrated resister, or a "Brake chopper" which feeds an external resister.
 

 

I first bought the external resister due to lack of understanding / research.
 

 
.. .before I worked out it does not connect directly to the VFD.

Then I bought the "Brake module" EMB 8252-E, which connects to the UG+ and UG - pins.
adegis.com/media/asset/6e4b8a95789dbed2a...ed149b4af51f912d.pdf
They are connected correctly.

However, that is not the issue. If you look in that video I linked a couple of message further above, at that point in the video, you can see the VFD oscillating back and forth into overcurrent as it tries to brake the spindle motor, without any form of resister added.

Back then, I somehow found out how to set the VFD into a coast down mode.  That must have happed just after I made that video.

When I  hit the spindle stop, the VFD switches straight to "off", and current drops to zero, no attempt at decelleration, no over current. That is how I operated it for the last couple of years. 

Before I even connected the brake module, I tried to return the VFD from "coast down" mode to normal brake (which would mean overcurrent without the brake module installed), and failed.

I can see two explanations.
1/ I was informed of, or stumbled onto a parameter setting, or combination of them to set the VFD to coast down. So it no longer follows the C13 deceleration setting, it just disconnects from the motor, and leaves it to coast down. Now I can't find that setting, nor remember what I did.

2/ I blew something in that VFD which was responsible for decelleration current. But there are no other symtoms of anything blown in this drive. It works perfectly, and gives no errors.
Cheers,
Mark


 

This hopefully explains it better...


So per the manual, I have the following control commands: Pin 7 / Pin 8 (Analog in) connected to a Mesa analog output, and jumpered for 0-10V. This is the main control. The VFD doesn't get on/ off commands, it gets speed commands. Pin 9 (Power for a control poti) Unused. Pin 62 (Analog out) Unused Pin 20 (power out for digital inputs) Unused. Pin 28. (Activate VFD) Controlled by Mesa digital output.Pin E4 (Change direction) Controlled by a Mesa digital output.
Pin E3 DC (DC braking) unused.
Pin E2 (Jog at frequency 2) Unused.Pin E1 (Jog at frequency 1) Unused.
Pin 39 (Gnd) Connected. Output Relay
K11 (NO Out) Connected to Mesa inK12 (Common) Connected to Mesa in.

Personally, I'd just buy a servo and rip oit all the crap on the spindle, you can get a 5kw spindle and drive on Alibaba for $400 shipped or less. That'll give you what you're after for a lot less hassle. Pull out the pulley system and all and just direct drive. Get a 5000rpm servo that should give you way more cut powe than you have.

Pick your excuse :
1/ That requires more effort than my inherent laziness allows
Everything is already in there.

2/ I don't see a deal like that. The best deal offered here for a 5KW servo and driver from AliExpress is at least €1000, so will cost more like €1500 delivered, with tax and customs.

3/ I only have 16A feed at 400V. The required supply varies, but those 5KW servo drivers seem to require supplies which can peak above 20A.

But it is basically what Schaublin did on the follow on 125-CCN model. Since my collet closer limits the spindle to 3000rpm, a 1:2 reduction to the spindle would work, as those servos seem to be 6000rpm.