SEW Servo drive with plc M340
SEW Servo drive with plc M340
(OP)
Hello guys,
Please i need help about SEW Servo drive controlled via SBus & Field Bus Modicon M340 PLC.
The problem is, when the motor reaches its desired position, the homming request still be on and the status word.0 ( motor is turning ) is sent to plc in a flashing manner (On/Off).
What could be the reason of the homming request even the target is reached ?
Please i need help about SEW Servo drive controlled via SBus & Field Bus Modicon M340 PLC.
The problem is, when the motor reaches its desired position, the homming request still be on and the status word.0 ( motor is turning ) is sent to plc in a flashing manner (On/Off).
What could be the reason of the homming request even the target is reached ?
RE: SEW Servo drive with plc M340
Would need a little more info to be able to help.
What SEW drive is it ?
Are you driving it from the PLC program MOVI-PLC?
Have you used any manuell overide program for commisioning?
Have you requested homming?
What is the name of the signal you call homing request? AM_HOMING?
Or have you asked it to go to position with set speed ?
Best Regard A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: SEW Servo drive with plc M340
I would like to thank you for your reply, and this is my situation
- SEW Movidrive MDX61B, programmed with IPOS.
- Fixed speed with a fixed target position.
-controlled via plc M340.using i/o scanning via ethernet.
- Homing means moving toward the target position ( when target position reached, homing = 0, and when moving, homing = 1).
- as a Hint, when using the Jog mode, everything works properly, but when using Automatic mode ( control words ), eventhough target position is reached, but the drive still looking for the home (stay moving with small displacement steps ).
- my question is, what should we do to prevent the motor from moving once target position is reached ?
My case, target position=1709.
i want the motor to stop at 1709 until next cycle is started.
Thank you so much for your help
RE: SEW Servo drive with plc M340
https://download.sew-eurodrive.com/download/pdf/11...
BR A
RE: SEW Servo drive with plc M340
yeah i am agree with you, the homming is like the initial position, in my case i have a rolling chain with product on it, once it travel from initial position to target position it has to be re-initialised.means every time the motor turns 1709 and start again from zero.
i hope it can be understood.
Thank you so much.
RE: SEW Servo drive with plc M340
I'm not sure that homing can be used that way if homing has the value 0 and the target position is 1709.
The drive should try to go back to 0 when you set homing.
But as I said, I'm very unsure here.
Does the operation have an external absolute encoder or is it possible?
A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: SEW Servo drive with plc M340
Also, frequently the system isn't supposed to use "home" normally as a frequently visited location as that has additional motion control involved. Normally there is home then a location like '2' and then your target position '235' then you return to the '2' position not ever 'homing' again.
Keith Cress
kcress - http://www.flaminsystems.com
RE: SEW Servo drive with plc M340
- a sin/cos encoder is connected to the DEH11B card of the servo drive.
Can i configure it in an openloop control ( neglect the encoder ) and just use a limit switch or a photocell to ensure that the product reaches the target to restart the cycle again ?
RE: SEW Servo drive with plc M340
https://download.sew-eurodrive.com/download/pdf/11...
BR A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: SEW Servo drive with plc M340
RE: SEW Servo drive with plc M340
I guess it depends a bit on how accurate the position must be at the end.
But often things have a tendency to slip on chain tracks so a photocell at the end of the conveyer is probably a safer solution than just going on pulses.
I would probably always have a photocell/sensor at the end even if I used an encoder for the actual positioning as extra security.
If you want to transport several things at the same time on the conveyer, positioning in steps, it will be a different thing.
Best Regards A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: SEW Servo drive with plc M340
/A
“Logic will get you from A to Z; imagination will get you everywhere.“
Albert Einstein
RE: SEW Servo drive with plc M340
Currently i am in holidays, once i get back i will return you the feedback 😊