[cncuser1]

I would like advice on connecting a G540 to a speed controller for a brushed 110 VDC motor ( stock motor on a Sieg X2 mill)
I will use mach 4 and have a UC100 to connect to the G540.

My main concern is connecting the Gecko G540 pins: VFD GND(pin7), VFD OUTPUT(Pin8), VFD +10VDC( Pin 9).
Attached is the picture from the Controller "instructions" and a link to the controller sales website.
(https://www.aliexpress.com/item/HX-P...65962e0eNK8xFg)

Could someone confirm that :
Gecko Pin 7 connects to controller pin marked GND
Gecko Pin 8 connects to controller pin marked PWM
Gecko Pin 9 connects to controller pin marked 0-10V


Attachment 412296

[skrubol]

Best connection for that would be:
Gecko Pin 7 (GND) to driver GND
Gecko Pin 8 (OUTPUT) to driver 0-5V
Gecko Pin 9 (+10V) to driver +5V

The Gecko Pin 9 is the input voltage, and it varies pin 8 between GND and the voltage on pin 9. So if you've only got 5v on pin 9, you'll only get 0-5ish V on pin 8.
I have read that there is some voltage drop on the G540 that really shows on 5v inputs, so you may have some trouble getting all the way to top speed for the drive if you can't compensate in the drive.

[john-100]

an alternative solution can be to use a low power regulated 10V power supply (10V @ 200 to 500 mA )
just to power the G540 PWM to analogue converter

Attachment 412408

from the G540 manual

"
ANALOG OUTPUT: This is a 0V to +10V opto-isolated analog output intended for use with VFD drives. VFD OUT goes to 0VDC while the G540 is disabled. Connect VFD GND, VFD OUT and VFD +10V to the VFD drive inputs. Make sure the VFD drive positive voltage does not exceed +12VDC. Do not short VFD OUT to any other terminal. Do not reverse polarity to VFD GND and VFD +10V or the G540 may be damaged.
"

John

[cncuser1]

@john-100 Can I use the type of external power supply that comes with consumer electronics like an internet router, i.e. a wall wart, ( provided the Volts and amps are OK)?

[john-100]

provided it has a regulated 10V output it should work OK
(the output voltage of unregulated varies depending on load current and may be too high for the G540 )

the G540 manual states the maximum supply voltage is 12V so a regulated 12V supply can be another option

the G540's PWM to 10V analogue converter supply current is not given in the manual but I expect its only a few mA

John

[cncuser1]

Hey John and skubol, I am having this problem now.

When I connect the gecko directly to the controller the voltage across the gecko pin 8 drops to about 2.7 volts, as skrubol predicted.

So in looking into John suggested, I am having problems understanding power supply terminology.

Regulated I understand, but I only find big ones of many amps that look like they are meant for prototyping electronic circuits.

I see regulated supplies that are also switching. But I am worried the switching property won't play nice with the PWM to analogue converter of the G540, any advice?

This is the regulated supply:

Attachment 414132
This is the switching supply described as regulated: https://www.ebay.ca/itm/Regulated-Switching-Supply-for-LED-3D-Printer-Security-Camera-System-12VDC/253187238447?hash=item3af322aa2f:m:myr_nOiuPUjl1Rz xL_Q7yyQ:rk:67f:0#shpCntId

[john-100]

there is not enough detail but photo of the ABRA power supply looks too large
but it would power the G540 PWM circuit OK

a regulated "wall wart" with a 12V @ 200mA output will be more like what you need for your G540

an old style power supply with a transformer , rectifier , capacitor & 7812 linear regulator will be less noisey than the switch mode power supplies in your second link

I don't know what its like in your country but in the UK the greens have made it almost impossible to buy the old linear plug in adaptors

John

[cncuser1]

Cheers John, I'll try the wall-wart route using your suggested diagram as a reference. ( I have a box of them to search through)

[cncuser1]

John, I made an attempt but have a problem, could you take a look?
I have a 14V wall wart, but thought it was too high a voltage ( 12V max). I built a voltage regulator circuit with an LM317T, R1=270Ohms, R2=1800 Ohms, Throughout my problems the voltage across point A-B are 10V within a few mV.

The problem is my spindle shaft RPM is at about 60% max rpm. The hiccup is this happens when I boot up the entire driver/power supply box ( G540, main PS, spindle controller etc). Note in this scenario the voltage across C-D is 6V and the current flow through D is about 0.3 mA. So it seems that there is a 4V drop across the G540.

But when I cycle the enable switch (EN) on the spindle controller, the spindle RPM goes to 100% and the voltage across C-D is 10V and the current flow through D is about 0.5mA! Sometimes when I cycle the enable the RPM goes to max and then drops to 60%, sometimes is stays at 100%.

At the begging of my tests just touching the the multi-meter probe to one of A, B, C, D caused a change in the RPM, so I put a 0.01MF capacitor across A-B and another across C-D. This eliminated the change in RPM due to just touching one probe to a circuit point, but the main issue remained.

If you have any advice I'd appreciate it.



Attachment 414986

[john-100]

usually with voltage regulators like the LM317T or 78xx positive regulators
I put a 0.1uF capacitors across the input and output
and a electrolytic capacitor of about 1 to 10uF across the output

if the wires from the 14V wall wart are long then add a electrolytic capacitor of about 100 to 1000 uF across the regulator input

without the capacitors the regulator IC will oscillate and very likely output a 14V square wave output !!!

I check the current that flows into the G540 pin 9
if its less than 100mA I would be more inclined to use a 78L10 regulator that limits the output current to 100mA
Attachment 415012

save from a cnczone post
Attachment 415010

John

PS
LMC6032
LMC6032.pdfLMC6032.pdf

[cncuser1]

Thanks John
I'll try the caps.