Siemens MM440 torque limit

ason · Mar 23, 2011

Hey i have an old application that i have change this:
torque limit
P1520 5.20
P5121 -5.20

when I start the drive and it stuck i have
R31 2.35

why i dont have 5.20

I dont wont a torque limit on this drive,
if it stuck i want to have over current.

KalleOlsen · Mar 23, 2011

Check P640. It is default 150 i.e. the current limit is 150% and is probably not enough to generate the torque you want.

===
What kind of load is it?
Conveyor, fan, pump, mill ...?
What stands in the P1300?

Kalle

ason · Mar 23, 2011

KalleOlsen said:
Check P640. It is default 150 i.e. the current limit is 150% and is probably not enough to generate the torque you want.

===
What kind of load is it?
Conveyor, fan, pump, mill ...?
What stands in the P1300?

Kalle

P640 150%
P1300 sensorless open loop.

It´s a starwheel that lifts up pipes from a conveyor,
And some time the the pipes are not straight and they dont roll away from the starwheel on the other side.
And then the starwheel get stuck, then i want the drive to stop for over current.

Now the drive keeps trying to move, and doesnt alarm out for overcurrent.

DickDV · Mar 23, 2011

Why not set your overcurrent detector down to 148-149%. The higher torque could just destroy your machine.

KalleOlsen · Mar 23, 2011

ason said:
P640 150%

And then the starwheel get stuck, then i want the drive to stop for over current.

Now the drive keeps trying to move, and doesnt alarm out for overcurrent.

The drive will limit the current to what you set in P640. That means you will never get an overcurrent trip, but insted a fried motor (or a motor overheating / overload trip).

It is possible to put a current limit message out on one of the relay contacts, or if you are using Profibus or USS you can send the current value to the PLC an evaluate it there.

Kalle

ason · Mar 23, 2011

I have the drive on profibus, and can stop the automatic when i have overcurrent.

After that i need to jog the drive backward, to get the tube out of there
And the problem now is that i get overcurrent at once
But if i change P640=200% after i get stucked and then drive backwards it works.

So is there any time limit that i can change or other parameter that can help me so i can jog backwards in this situation?

KalleOlsen · Mar 23, 2011

Did you look into the BICO concept?
There's also a trick with several parameter sets, perhaps you can use that. And you can mask out stop reactions / causes in P2101

.

Kalle

ason · Mar 23, 2011

KalleOlsen said:
Did you look into the BICO concept?

Yes i have a bit for overcurrent there

KalleOlsen said:
There's also a trick with several parameter sets, perhaps you can use that.

Think that use 2 DDS is the bestway to solve this,
1 normal/automatic
2 JOG

How to change DDS over profibus?

KalleOlsen · Mar 23, 2011

I have never needed different P-Sets, but here are some presumably useful tips:

http://support.automation.siemens.com/WW/view/en/26436658

I believe there are spare bits in ComW2 that you can link and use for the PSet change. Or you could possibly link the jog minus or CCW bit.

Kalle

ason · Mar 23, 2011

Thanks was reading this today but didn't get it then,
But now I got it, I switch with p820, 821

Siemens MM440 torque limit

ason

Member

KalleOlsen

Member

ason

Member

DickDV

Member

KalleOlsen

Member

ason

Member

KalleOlsen

Member

ason

Member

KalleOlsen

Member

ason

Member

Similar Topics