G340 + MCG servo US enc problem

[XLR84x4]

Hi all,

I am have some troubles with my new drive/servo/encoder. The fault light is always illuminated. With the test jumper in term5 to term7 motor continously spins. When hooked up correctly fault light on and servo is easy to turn by hand.

I have gone through the test as recommended. The fault light does light up and turn off when I turn the shaft in either direction however I only read 5.00V on the meter. I am finding it hard to find the + test point but I am reading 5 V

Spec's are X axis
Power supply 35V 7A
GRex100
G340
MCG ID33004 225 oz/in
US Digital E4P encoder.
jumpers set to Common +5VDC and term 12 is hooked up to the +5VDC on the x axis terminals on the Grex

There are no options jumpers blocks in place as the G340 did not have any fitted when supplied.

When the correctly connect, when I remove the arm+ and - to the servo the fault light goes out.

Could it be my new servo??

All help/advice appreciated

[XLR84x4]

To add to this,

When I drive the G340 from mach ie G0 x100 with the motor disconnected, encoder connected also the fault light blinks to indicate a position error.

BTW with it all hooed up I can still spin the servo by hand. The servo is not trying to hold position.

It is looking more like the servo any thoughts

Jason

[XLR84x4]

I thought I would post the outcome and sucesses I had after speaking with Mariss from Gecko drives.

After a very informative conversation and learning experience during the conversation the outcome was that I didn't need to purchase the G340 and the G320 would have suited due to the nature of the encoder I was using.

We also talked about my setup and rapid's I was expecting and gearing etc, again it was good to have someone with clear and concise explanations which had me revisit my motor calcs and gearing. I was quoting 1000ipm but for a tangential knife cutter with nested patterns on a 6 x 4 table I was dreaming.

A quick check of the power supply showed I had the necessary capacitors in place thanks Mariss for the formula 100000 x A/ v to give you necessary capacitance for reduction in ripple voltage minimum with a max of 40000 uf.

I have 3 x 10000 uf in parrallel so all was good there.

I removed the extra card (encoder up to X lines, not required) from the G340 and swap the card with a opto isolator from a G202 I had for my stepper. A little tricky to remove the opto from the G202 but all ok.

I realized the Err/res term5 to 7 is important and the jumper was necessary for inital testing of the servo with a later addition for some control wiring. I also reversed the ARM + and ARM- at the Drive ie servo red to arm- and black to arm+ from the servo. The option jumper is not required

When I hooked up the servo it started to pulse/spin with fault light illuminating between pulses. Adjusting the limit pot up and a little on the gain had the servo humming nicely and locked solid.

A G0 x100 from Mach via the Grex had my servo spinning and stopping nicely and a smile as wide as the Grand Canyon.

My motor/gearing shafts are getting machined tomorrow with a hookup and x/y testing on friday. Z plunge using pneumatic actuator and Z servo for tangental the next machining excercise

It is great to have these learning experiences and thank you for the people that posted similar problems and solutions that I waded thorough before giving Gecko a call. More reading of similar posts about encoder res and Mach3 setup tonight should have me fresh to start inital testing when the servo's and steppers are moving the X & Y gantry around.


Jason