Yet another AT1 VFD question!

I'm getting to grips with my AT1 VFD... it's mounted in a wall cabinet, with buttons mounted on the lid. I have set the parameters the way I want, and all is going well, except for:

P53 (X4) set to 18, jog reverse. Nothing happens. I can select reverse, then press 'jog forward', which does work - just no 'jog reverse'. I'd rather not have reverse available as my lathe spindle has a threaded mount and I'd rather not have the chuck unwinding itself onto the lathe bed if I accidentally leave it in reverse!

P54 (X5) set to 19, emergency stop. I have a latching 'mushroom' button on the lid. Again, nothing happens when pressed, and the motor continues to run. At the moment I have set it to 16, 'external error' which does the job - but not ideal.

I have checked the operation of the buttons with a multimeter, and they're doing what they're supposed to do.

Can anyone give me some clues?

Cheers,

David

Oops!

Left out some vital info... this is the manual for the VFD: http://myosuploads3.banggood.com/products/20190919/20190919015909SKU792664.pdf

It's probably the smallest unit, at 1/2 HP (I'm using it with a 1/3 HP motor).

Edited By David Jenkins 4 on 30/03/2022 20:18:10

Don't know if I'm reading this correctly, but according to the manual, multifunctional Input 1 (P58) apparently must be set to 20 to enable multifunction inputs P50 to 55, but by default it is set to 0.

Not sure - other functions are working, such as Start, Stop, Emergency stop (in the dodgy error-forcing way I've implemented it), Jog and Error Reset. All without setting P58.

P58/SP1 is one of the most obscure parts of the instructions - the parameter tables call it "Multi function input", but in the diagram it's shown as "Open collector output". In my opinion, it's a method for switching something external by pulling this terminal down to 0v, e.g. an external relay or an indication light. If so, it gives no idea of the current carrying ability! (my guess is 'minimal' ). This probably is operated by option 20 from the control inputs. Note that the next one, P60/SP2 (not available on the very basic AT1) is described as 'relay output'.

Saying that, I might try it, just for the hell of it!

However I could be totally wrong - it's horribly ambiguous - like most of the 'manual'! I have decades of experience in electrics and electronics, but this manual is a farce. The value of the product would go up 100% if the manual was re-written sensibly.

I do have something that works, and (I believe) installed safely, but I just want it to work properly, "to the book".

Edited By David Jenkins 4 on 30/03/2022 20:58:49

David

Is your emergency stop latching button NO or NC ?

NC do work but only on release when they remake the circuit in the normal stop modes, so might be the same on the e-stop?

Yep ! My thoughts, is the stop button NC or NO, then there's the issue of latching ! Noel

My switch has both NC and NO available - I'm using the NO side.

In other words - the contacts are open when not pressed, then closed and latched when pressed. They continue to be closed until the mushroom button is twisted and released. I did set one of the other NO buttons to 19, and it still doesn't work (I held the button in!).

It looks as though option 19 simply doesn't work on any of the X1 - X6 inputs... I'm going to leave it as 16, "external error", as at least that works (it also proves that the switch is working correctly). At least it deactivates the system until the VFD is reset.

Glad it's not just me that's struggling with this one.
I can't get E-Stop to work either, and tried it with various X posts, and both NO & NC switches.

At the moment I'm using momentary NO push buttons for start/stop, and a latching toggle for reverse, with all parameters at default except;

P10 - 2 External Speed
P11 - 2 External on/off
P50 - 3 X1 Start
P51 - 4 X2 Stop
P52 - 5 X3 Reverse
P25 - 1 1425 rpm

I've tried playing with P58 and P50 for E-Stop and failed there
P53 - 19 doesn't work either for E-Stop.

In my case, I don't need jog at the moment, as it's for a tapping machine (Reverse, is in case I ever need to do any left hand tapping.

Bill

When bench testing I found the emergency stop option 19 in p50-55 had the same effect as option 0 (inertial stop ) in p12 or the same as when the power is cut and the motor just slowly spools down, not what you really want for an e-stop

Option 1 (deceleration stop) in p12 stops reasonably quickly and certainly quicker than my ml7 single phase lathe.

Option 2 (brake stop ) certainly stops quickly but would be quite mechanically unsympathetic if used constantly, though playing around with braking time/ voltage in p13/14 may help, I haven't tried that.

I have just acquired a Harrison m250 lathe and wanted to use the original controls as far as possible.

I have :

P50-x1 set to 3 NO momentary switch= start

P51-x2 set to 4 NO momentary switch = stop ( keeping the stop pressed in has no effect and pressing start will start the motor and you have to release the stop button and re-press to stop )

P52-x3 set to 9 wire reversing on the original rotary switch reverse

P52-x4 set to 15 section speed input 3 on the original rotary switch forward. This is for a slow forward set speed but could be programed in p29 for any frequency.

When the rotary switch is in the centre original off position, pressing start ,starts the lathe in forward, switching to original reverse, reverses and original forward gives slow forward without having to switch the lathe off. The stop p51- x2 works in all these positions and in the event of losing power, on restarting the vfd the lathe doesn't run until start is pressed.

Edited By iNf on 02/04/2022 23:18:41

I am using this VFD on a horizontal mill, I want to use the relay output to enable the coolant pump. Any idea what parameter controls the function of the output to make when running?

From the standard AT1, AT2, AT3 data sheet. TA common, TB Normally open, TC normally closed. 250VAC 5A/30VDC 3A

You will have to check with a multi-meter if this is triggered by starting the motor and stopping the motor.

Martin C

PS The data sheet shows the relay as optional. Out of curiosity I searched for images of the terminals. There are a few showing TA, TB and TC as solder pads on the board next to the UVW outputs. You will have to investigate for yourself if these are connected to a relay and need either wires soldering to them or a small socket/plug needs adding.

Edited By Martin Connelly on 11/04/2023 13:37:24