[Barry Flannery]

Hello,

I am trying to use Mach3 and a Gecko G540 to control a "Sangmutan" 2200W BLDC motor + driver. I am using the motor on a direct belt driven G0704 conversion.

The motor and driver is here:
http://www.automationtechnologiesinc...tor-and-driver

The main discussion thread is here:
http://www.cnczone.com/forums/bencht...tml#post800897

I followed this condensed guide to get an external potentiometer working and have made the appropriate connections to put the spindle in the FOR direction and Start stage.
http://www.cnczone.com/forums/attach.../432048.attach

I am trying to use a 0-5V analog signal to control the speed of the motor by using the relevant analog input pin on the BLDC motor driver board. I have verified that this functionality works by using an external potentiometer and varying a 0-5V signal to the relevant ports. I was able to control the motor across its full range of 0-6000rpm with the 0-5V input.

I now want to replicate this using my G540. I have my G540 hooked up and it correctly controls the 3 stepper motors using a DB25 parallel printer port on a Windows XP machine.
I have supplied the G540 "VFD" pins with external 5V supply, external 5V ground and then I have connected the G540 VFD output to the "Sangmutan" driver board analog input and also the respective grounds have been joined.

From this point on I am unsure what to do in relation to the Mach3 configuration settings. I have read through all of the forums and discussion posts that I could find but there is a huge amount of incorrect and contradictory information.

Mach3 Settings that I think are correct:
Spindle Pulley 1 set to 7000rpm.

Mach3 Settings I am not sure about:

• Ports and Pins
• Spindle Settings
• Whether a physical on/off spindle control relay is required
• Whether motor speed feedback in required

I would greatly appreciate any help.

Regards,

Barry

[daniellyall]

one problem from 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.

[Barry Flannery]

one problem from 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.

UPDATE - SOLVED: I got it working after a bit of troubleshooting. It appears that my motor driver board had a factory fault and the pick and place machine seems to have put an incorrect value resistor on the analog input going to the LM358 Op Amp. Basically, the input was extremely low impedance and the G540 was unable to drive the input sufficiently.

I have fixed the board fault by bypassing it and the system works correctly now. I can control it in MACH3.

Regards,

Barry