servo drive alarms when applying e stop power

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Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
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CNC Control System Serial Number: A901133
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CNC12: Yes
CNC11: No
CPU10 or CPU7: No

servo drive alarms when applying e stop power

Post by Deere103 »

hello all,
first post here and making progress on my oak retrofit. machine is a lagun vmc 3516 with yaskawa AC motors and drives.

I'm working through a few minor issues still on the I out side but things are mostly OK. as for the outputs, I am confused somewhat on the wiring of the spindle and inverter related components.

I will attach all diagrams with the referenced wires:

I currently have no inputs for high, mid,low gear as my machine has no contactors for this and is the 8000/10000 spindle option with spindle encoder.

Inv reset is currently wired to 116 input to spindle drive
spindle enable is currently wired to old output 21 which feeds a contactor that energizes 118 spindle drive input

33 is wired to out1 plc 1616 and is the spindle orient
115 is wired to input 1 plc1616
these appear to be working correctly when I force the spindle outputs and orient commands as the spindle spins slowly until the orient command aligns it and the orient complete I out is triggered.

inverter ok input is currently wired to 70 which is labeled as servo ready on my wiring diagrams but I'm unsure if this is the proper input. it no longer uses the 20cr contactor as this has been bypassed in favor of the oak plc control.

I have no clue how to wire the spin direction, dir no/nc so that the machine knows to reverse the spindle.

I also have a soft start cancel for rigid tapping "125" that I'm unsure how to incorporate and trigger through oak, but this isn't immediately urgent.

finally, the most pressing issue is i have no servo motion bc when I cycle the e stop and apply power to the servo drives (yaskawa sigma I sgdb-30adg) they immediately trip the alarm light on all 3 drives and don't apply power to the servo motors (I can still manually move axis). I ordered a cable to try and communicate with the drives as these don't 3xternally display alarm codes, but in the meantime does anyone have any idea why the drives would hit the alarm? im using the centroid supplied cables. encoder imout seems to be working properly for all axes, logic power comes on and creates no alarm.

I'm sure I left out plenty of important details that will be needed but I really appreciate any input you guys may have. would be awesome if someone has done a retrofit on yaskawa droves coming from a Siemens acramatic and I could just copy and paste! 😂

thanks,
Evan Image
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cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: servo drive alarms when applying e stop power

Post by cncsnw »

Is your service to the control single-phase, or 3-phase?

Is that a 626-series spindle drive?
Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: A901133
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: servo drive alarms when applying e stop power

Post by Deere103 »

you're correct it's a 626vm3 drive and a 3 phase machine
cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: servo drive alarms when applying e stop power

Post by cncsnw »

... and you have it connected to 3-phase power?

One way to make Sigma drives fault as soon as line power is applied, is to supply only single-phase power.

Otherwise, you need to get the digital operator or serial cable, and find out what the fault code really says.
Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: A901133
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: servo drive alarms when applying e stop power

Post by Deere103 »

20220619_221511.jpg
thank you for the idea, I haven't modified anything on the input power side, only the control circuits. I will check tonight when I'm tinkering again. if memory serves, I checked that the 3 4 prong relays are clicking and triggering , but I need to actually check thier output as that should be the third leg of the power to the drives I think.

Thanks again for the suggestion
Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: A901133
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: servo drive alarms when applying e stop power

Post by Deere103 »

I took some meter measurements tonight. the spindle drive has 240v between each leg of R,S,T.

The servos however have odd voltage readings and they aren't all the same. I'm not sure what would cause this, but I'm not familiar with how the 3 phase filters work, nor do I know if the alarm state causes some type of voltage suppression. maybe you guys could take a look at the readings and see what you think?

the 3 independent relays following the line filter are outputting 115v, 140v, and 210v

this is the same readings I get when checking ground to the RST terminals on the servo drive

ground to R=114v
ground to S=140v
ground to T=210v

checking across the RST leads (same readings on all 3 servo drives):

R to S = 126v
R to T = 233v
S to T = 108v

for logic power:

ground to r = 116v
ground to t = 212v
r to t = 240v
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cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: servo drive alarms when applying e stop power

Post by cncsnw »

What are your leg-to-leg and leg-to-ground measurements on the line side (terminal 1) of the three solid-state relays?

I expect you have a faulty SSR switching leg 2 (to S).

No, the servo drives do not load or alter the incoming legs when they are in an alarm state.

Is there a motor (e.g. a fan?) or transformer connected between legs 2 and 3 (S and T) somewhere? If so, that could explain the leg-to-ground voltage there, in the case that the SSR is not working.
Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: A901133
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: servo drive alarms when applying e stop power

Post by Deere103 »

well the culprit was actually the 20A fuse feeding the ssr...it's strange to me that it only dropped the voltage and didn't actually blow but maybe that's how this type of fuse is designed. in any case. I am able to power the drives without fault now but did notice there is only a red charge light on the X and Y servo drive not on the Z...is this normal?

I also have no power to the servo motors yet, at least not enough to feel resistance and cannot jog the motors even to find home.

there is also uneven voltage measurements at the u,v,w outputs, does this look strange? I'm not familiar with how the drives work and control motor output voltage.

X servo drive:

ground to u,v,w = 15.8v

Y servo drive:

ground to u,v,w = 20.8v

Z servo drive:

ground to u,v,w = 77v

I'm sorry for all the questions but getting the drives to work was a huge step and I am really thankful for the help with the input voltage tips. I hope I will see this thing move soon!
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cncsnw
Posts: 3763
Joined: Wed Mar 24, 2010 5:48 pm

Re: servo drive alarms when applying e stop power

Post by cncsnw »

In my opinion, there is little to be learned attempting to measure voltage on the U, V and W outputs. The voltage available there can vary widely, and may be anywhere from 0-400 Hz, carried by a PWM signal that switches at maybe 5kHz.

If the motor turns, it is good. If the motor does not turn, check the drive for alarm codes.

Do you know whether your drives are configured to run in torque mode, velocity mode, or position mode?

Do you have your CNC12 software configured to run the axes in velocity mode, or in position mode?

The old control probably ran them in analog velocity mode, so if you have not yet reprogrammed them, that is probably what they are expecting.
Deere103
Posts: 24
Joined: Sun Jun 12, 2022 6:42 pm
Acorn CNC Controller: No
Allin1DC CNC Controller: No
Oak CNC controller: Yes
CNC Control System Serial Number: A901133
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: servo drive alarms when applying e stop power

Post by Deere103 »

ahhh I suspect you're right about that, I guess I will have to wait for the cable I ordered after all to check the programming (there may be a way to do it on the digital keypad?)...but I'm finding its a puzzle, figuring it out one step at a time. thanks so much for your input and quick responses.
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