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Lathe Jaguar VXS inverter - remote pendant
raynerd:
Cheers guys . Mfletch - do you know if it was log or Lin and do you or anyone here have any idea of an appropriate circuit?
raynerd:
Just looked as I've only just got home, the current pot is an alpha 7L4 a so I'm guessing that is logarithmic.
PekkaNF:
Not sure if this helps, because you asked help of Jaguar VFD and I haven't used them. Others yesh.
I use 2,5K to 10K LINEAR potentiometer. I don't think that exact value is critical, as soon as it does not sap more current that VFD provides and it is not too huge, because miniscule current is also a problem on control circuits.
Your symptoms sounds like: potetentiometer is of way too low or high value (like under 1K or over 100k), or logarithm (very different behaviour, broken, connected wrong (+ or GND on wiper, or one pin disconnected).
Maybe potentiometer cable is nonshielded, shield connected to wrong pin or not connected all.
Or at very worst potetiometer supply failed, but usually the whole unit would be pretty nonresponsive then.
http://www.electronics.dit.ie/staff/tscarff/DT089_Physical_Computing_1/LABS/LAB_3/pot%20wiring.jpg
I would check:
* Wiring per manual. You want one leg to show positive voltage, typically 12, 10 or 5 volts DC and other end grounded. The wiper must go to analog input.
http://www.electronics.dit.ie/staff/tscarff/DT089_Physical_Computing_1/LABS/LAB_3/pot%20wiring.jpg
Multiturn or servopotetiometers can have different pins that you think:
https://www.bourns.com/pdfs/3547.pdf
* Disconnect potentiometer wiresat VFD terminal from the pendant and connect NEW potentiometer on VFD pins with short wire, power it up and measure that voltage between GND and wiper pin varies smoothly when you move pot from one end to another one.
If this works, then I would check the pendant and it's potentiometer.
Pekka
John Rudd:
Chris,
I've mailed you a drawing....,the forum doesnt support photos from my ipad anymore... :doh:
raynerd:
Evening
John has kindly provided a circuit diagram and lots of support in creating a pendant. I now have the parts on order so they should arrive by weekend. I have removed the old pendant that has never correctly worked and I have gone through to check the parameters that I don't believe I ever correctly set up either!! I can't get the bloody thing to run at all at present despite F01 and f02 set to zero for keypad mode, anyway, my little boy woke up and started crying so I've had to pack it in for the night, I'm sure I'll figure it out tomorrow. (edit - reading the manual and I need to make a terminal connection between p24 (24v) and Forward/Rev to give it a RUN signal)
I made a note of the functions I don't truly understand what they should be set to... if you have any suggestions as to even a sensible start value, I would appreciate it. I've also linked to a picture of the motor plate if this is needed:
F03 - Maximum output frequency (currently set to 150)
F04 - Base Frequency
F06/07 - acceleration and de acceleration time (0-3600)
F10 - motor poles (set to 4 when I got it, but can I tell my motor is definitely 4 pole?)
F12 - PMW carrier frequency
Really appreciate any advice as to sensible starting values...
Motor plate : http://raynerd.co.uk/wp-content/upLoads/boxford26.jpg
Chris
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