- G540 to generic DC controller
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G540 to generic DC controller
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
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Re: G540 to generic DC controller
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.
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Re: G540 to generic DC controller
@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)?
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Member
Re: G540 to generic DC controller
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
Last edited by john-100; 02-15-2019 at 07:19 AM.
Reason: correct typo
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Re: G540 to generic DC controller
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
Last edited by john-100; 03-04-2019 at 09:33 AM.
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Re: G540 to generic DC controller
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)
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Re: G540 to generic DC controller
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.
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Re: G540 to generic DC controller
Thanks John
I'll try the caps.
Last edited by cncuser1; 03-11-2019 at 03:39 PM.
- G540 to generic DC controller
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