Motor Locked Sinamics S120

[bornwild]

We have a couple of S120 drives which are rack pinion system,which moves forward and back ward (linear motion only) . The drive shows Fault 7900 3 times per shift or sometimes more. The drive is commissioned for 6 -7 months. As per operator, it happens only during forward movements. What should I check. I checked the help file and it says to check below. I have increased the motor locked time but still the fault still comes up. Kindly advice

 

[JRW]

You should set up a trace and monitor the current and torque

Has this occurred since day 1 of your startup?

 

[baref00t25]

I agree with JRW. You should also track encoder position and speed. I've had that fault before when the encoder wire had an issue; same thing where the machine was commissioned for months and it would happen randomly.

 

[DarrylR]

Acceleration time, torque limit settings? Motor connections to the drive?

 

[bornwild]

I agree with JRW. You should also track encoder position and speed. I've had that fault before when the encoder wire had an issue; same thing where the machine was commissioned for months and it would happen randomly.

Actually I am in remote support and I asked the customer to check the encoder wire for any damages. Was your cable damaged? or is better to change the wire to rule out any issue

 

[JRW]

First find out if it’s a drivecliq motor

 

[bornwild]

hi,
this is the topology.Are these signals correct. Sorry I am new at Sinamics

 

[JRW]

Set your measure value acquisition to endless trace
download just the trace and start the trace with the arrow button

Watch the trace as it move back and forth

Can you do a screenshot of the expert list starting at about p300? and about the next 30 values down
That will tell us all the basic motor nameplate data

 

[baref00t25]

That looks ok. I would change your recording values. See the attached.

 

[JRW]

Lets see what its doing now- not just at fault time

Or can you not remotely connect at the moment?

 

[bornwild]

Yes I can remotely but they are not running at the moment. I will send you what you asked

 

[bornwild]

These are the paramters .

 

[JRW]

BTW
Barefoot25 has a great idea in post 9
That will start a trace when a fault occurs

 

[bornwild]

BTW
Barefoot25 has a great idea in post 9
That will start a trace when a fault occurs

This is the trace file screenshot.
https://drive.google.com/open?id=15mhLuyeg6EcZYQ9CYZwxdPbgeMxjXuOt

 

[L D[AR2P#0.0]]

Your trace was there, but is now not visible.



My comment - you need to show speed demand as well as speed feedback - it would appear you have a synchronous motor so you can replace the current feedback with speed demand.