Siemens 611U drive?

Question

Dear Sir

I am an Automation Engineer. I work for AVAND GRP Pipe Co. at Ahwaz -Iran. We have some problems with one of the GRP Pipe Machine that use SIEMENS SIMODRIVE 611 U .Drive Specifications that used explain below

When we have no load on gearbox side then motor can speed up to maximum speed.

But After coupling normal load gearbox motor start with normal ,speed can be increased only up to about 700 rmp (%30 of maximum speed) beacuase I/R module go to fault(DC-LINK Over Voltage Fault) and at same tme drive module stay at RUN mode. If you increase load more, then in lower speed I/R module go to fault (DC-LINK over Voltage)

I/R In feed Module 6SN1145-1BA02-0CA1

Motor 1FT6105-8AC71-1AB1

Power Module 6SN1123-1AA00-0DA1

Control Module 6SN1118-0NH00-0AA0

Line Filter For I/R Module 1P6SL3000-0BE23-6AA0

I think coupling of motor with gear box is weak & not so good .

.I will be very happy if you can help us to solved

Best Regards

Hossein Bijeh

E-mail:[e-mail]

Answer 1

Thre can be two possible problems

1) Either you have not entered the ratings of your motor correctly in the drive ratings.

2) there is a percentage slip compensation setting - it might not be properly set

If you are beneffited Please let me know by rating my answer.

Answer 2

Are you running the system for the first time or was it working properly before.? First of all what is the power rate of the motor.Is SIMODRIVE 611 U suitable for the motor.Check all these first.If everything is ok than you have got to check the input data's of the driver when you go into the input data's you will see all the data's.That is including voltage range and tolerances.You have also speed limits or data's,you have to check them also.Check the voltage when motor is running, there can be an over voltage occurring when running.Check the currents of every phase when motor is running.Check the grounding connection and voltage between phase and grounding.Then we will be looking for the programing of the unit.After all these write to me all the measurements and answer that I asked you.