Topics

1

Parallel Port breakout boards, motherboards, and dedicated accessories / 134 MOB Resistors

« on: March 06, 2015, 07:54:34 PM »

Hi

I have question about the resistors to cut the amp draw or match the amps of my steppers.

So I have 203v Geckos on an alum heat sink, 570 oz 5 amp nema 23 motors and 60v power supply ( little more than I need ).
According to Gecko...... 5A steppers needs  117.5K resistor per motor.
But..... I thought I'd try 4A resistors 62.67K per Gecko

When I tried the 4 amp resistors the motors could not, would not take full power. They would start to move and then stall and made a weird sound like they were jammed.
I changed to the 5A resistors and all is fine motors run at full power, low speed & high speed.

Do the steppers need 5A to run?
I also have a G540, 48v power supply with 570 oz steppers and they work on that system. The G540 is only 3.5A (no resistors)

Just seems strange it didn't work with the 4A resistors.

Todd

2

Cables, connectors, switches, contactors, sensors and other items / Help with Proximity sensors

« on: February 27, 2015, 09:51:54 AM »

Hi all
So I am down to hooking up my proximity sensors
I have 3 wire (brown, black, blue) Inductive sensors NPN NO (detect metal)
I thought this would be pretty straight forward according to page 23 figure 5 NPN Style of the PMDX 126 c manual.

But NOOOO it aint happing, Iam at my wits end trying to figure this out.

It should be pretty easy but when I hook up per fig. 5 the LED lights up on 12 of the BOB, and when I trigger the sensor the led gets brighter on the BOB.If I unhook the black wire the led is ever so faintly still on.

I have the brown wire hooked to the +12U on J12, blue to GND, black to ?12? There is an led on the sensor that lights when I hold it close to metal.

I took a pix of my proximity switch and a wiring diagram of the switch.
Any help or thoughts
Todd

3

Cables, connectors, switches, contactors, sensors and other items / Relays

« on: February 08, 2015, 07:12:12 PM »

Hi all
I have my new controller about 75% done, but I am stuck on trying to get a 3rd relay wired.
I have the PMDX 126 BOB,K1 and K2 working in Mach (pin 1 & pin 14 port 1)
I would like to add a relay to turn on my cross hair laser edge finder. K1 & K2 will power on router and DC system.
How do you wire /turn on/ control a relay....say from pin 16 port 1 on my bob?

I have mapped Mach to pin 16 , and can make the led come on on the board.
If i hook the laser directly into the board it will work ( on and off) though Mach
I have a 12v dc relay to use....but how do I trip the coil on the relay from the bob.
The laser is only 3 volts 5mw


Todd

4

Parallel Port breakout boards, motherboards, and dedicated accessories / Machine Hold 126 REV C

« on: January 09, 2015, 02:33:08 PM »

Hi
I'm building my new controller using the 126c board 134 board, ESS & 107 spindle card pmdx.

Now I want an Estop to kill everything in the box, but I also want to just stop motion at times and resume. And be able to free wheel the gantry with out shutting everything down.

The Estop I figured out ( I think Lol) But the stop and resume (Machine hold) not so sure.... I think it might be best to use Mach for this function. The board has an M Hold, function should I use this? Or just use the software or both.

The 126 also has the disable function for the drives. I believe this will give me the free wheel of the gantry with out restarting Mach. Just re Zero all the axis

Need some input on this
THX
Todd 

5

Cables, connectors, switches, contactors, sensors and other items / PCB stand offs

« on: November 04, 2014, 06:56:23 PM »

Hi
I have a really dumb question

I have a PMDX 126 rev. C BOB, PMDX 134 and a Warp9smooth stepper ESS plus a PMDX 107 spindle card.
I want to mount the ESS on the 126 board to keep the foot print of my control box small as can.

Now the dumb question. What size stand offs and what length should I get for the ESS and the 126 to the case.
And metal or plastic.

THX
Todd