Bridgeport with Siemens amps and servos

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21 Dec 2011 00:39 - 21 Dec 2011 00:42 #15916 by robh
check attached file

what i helped john out when we was playing with his machine

i think some where i haev a written out more detailed whats what, but i think image will speak for its self..
hope it helps

Edit, forum did not let me attach PDF so uploaded it

Siemens Axis - CHNC.pdf
Last edit: 21 Dec 2011 00:42 by robh.

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22 Dec 2011 19:19 #15944 by BigJohnT
Here is some additional info on tuning the drives that Rob sent me then reminded me I had it.

Pin15 on Power unit this needs to be confirmed as i think this is the
one to connect to GND or control 0V common
so the drives will have a common ref for all control signals and analog
in respect to the NC control

if you trace this one back should go off to control or to a GND plate
i will check this out for you tomorrow if you like on other machine

all other connectors are fine

Estop Out
73.2 & 72 this is safe to use in the Estop chain if you wish wire
through it as this goes through a relay on the axis board or run in into
a spare IO on mesa, your call using Estop chain means less wiring

the connector in middle of 73.2 & 72 is other arm side of the relay so
if u meter between them u should find a common arm, and the Normaly
Closed arm. wire as you need. as this relay picks when drive is powered up

Drive enable
id run this through a Mesa IO out or a sep relay off the mesa PWM Enable
if stock on IOs


Setup of Drives
you may not need to do this just depends how much someone has played the
drives

turn the P & I gain pots right down (Counter clockwise) (maybe make a
note of where they are or mark on pot with pen)

it would be wise to remove the motors from the machine for this as the
tacho are on the motor for Z
the X, the tacho is on the pully (unless you are lucky and its on motor)
i would advice putting slide in center and perform the below with
working limit switch or have someone watch to end of slide travel.



To setup Analog Drift
strap the Analog connectors 14 & 56 over (short circuit)
enable the drive (watch for run away)
and adjust the drift pot on the board untill motor stops moving (you can
measure the tacho feedback voltage(pin 13&55.3) with a good meter if you
like should read near 0.000V may drift a little that is fine near as
zero as can)

Tacho Feedback
this setup you could skip but aids in a nice running easy to tune drive
as controls how fast the motor spins per volt of analog input

the tacho should be 20V per 1000rev input
may be 3v/1000rpm not found one fitted with them yet i would check if
you can, may have them written on the side of tacho

10v analog in = 3000rpm on motor
1RPM motor = 0.00333V
10RPM = 0.033v
so
60v = 3000rpm on tacho
1rpm = 0.02V
10rpm = 0.2V

10RPM Is nice slow, user high if you like, i use a lab power supply i
can set voltage to.


John

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27 Dec 2011 03:09 #16011 by BRoth
The pin info is a big help, thanks! I'll have to take some time to check if what I have works.

It has the factory motor and two large relays for the spindle.

Attachments:

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27 Dec 2011 12:02 #16013 by BigJohnT
That is a similar setup to my BP series 1 with an Anilam conversion on it. I used a GS2 VFD from Automation Direct for the spindle. EMC can control them and they only need single phase 220v for the input.

John

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22 Jan 2012 21:04 #17025 by BRoth
I have been holding off buying anything until I know that the drives work. So far I haven't been able to enable them. The power supply board Yellow LED is on as well as the Green LED. I can hear the relay click and the Green LED is extingushed when I enable but there is no power to the axis drives. I thought it was the DC voltage being too high but as far as I can tell that is not the case. Anyone have any ideas or thoughts?

Thanks

Benjamin

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23 Jan 2012 01:26 #17030 by BigJohnT
Is the old control DOA? I finally jumpered out the drive enable and used a lab power supply with a couple of switches to "drive" my CHNC around... a 1.5v battery and a couple of switches should work to see if the axis drives work.

It's too late to see what leds are lit up on my boards, I'll try and remember to look in the morning.

John

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23 Jan 2012 03:11 #17031 by BRoth
I gave up on the controller and shelved it. If I feel like it I could work on it again but for now I'll go with Linux.

Yes John, that's what I was going to check the drives with. For now I'm mostly curious what LEDs are supposed to be lit. One other thing. Before I removed the controller, when the drives were enabled there was interference with the CRT, similar to what you would get if you had a spark coil near an old telvision. If I disconnected the ribbon that links the boards there was no interference. When the ribbon was reconnected and the power turned on, all the servos advanced 10 thou and all the LEDS were lit up on the boards, 5 reds, 1 green, and 1 yellow

Worst case scenario I'll scrap everything and have a manual mill, I bought it with that in mind.

Benjamin

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23 Jan 2012 12:59 #17044 by BigJohnT
I'm reduced to dial up atm but I'll go out to the shop and look at my cards under power and see what leds are lit up. Are you seeing the leds on the axis boards or the main board?

John

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23 Jan 2012 13:56 #17048 by BigJohnT
On my main board I have an amber, red and green led lit up when first powered up. When I enable the drive the red and green leds go out. When I disable the drive only the green led lights back up. I can't upload a photo of my drive from here on dial up...

John

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23 Jan 2012 17:35 #17061 by BRoth
Thanks John.

Only once did I see the red LEDs on the axis boards lit up. That was when my main board was lit up like you mention.

There is a relay on the main board for enable, right? There is no audible 'click' when my board is lit up like yours. Otherwise I can hear a click.

I'm stumped on this one.

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