DC Motor

Look at the trouble shooting guide, or call a service tech.

We can't solve your problems remotely.

DC Motor Trouble-Shooting Chart
DC Motor Analysis & Troubleshooting - PdMA
You might ask the motor/drive maker for help.

There are many different types of DC motors and drives. Some have reversing contactors, some do not, etc, etc.

If you can post a schematic, perhaps someone here could tell you what to check. Otherwise, we'd only be guessing.

Turn the motor around.

If you want a sensible answer try giving more information.

Lets try this:

• Was it running correctly prior to this?
• If yes, then you have a drive problem.
• If no, then what have you been doing to correct it?
• Was anything changed prior to the motor operating incorrectly?
• Do you have a spare drive you can connect the motor to?
• Do you have a spare motor to connect to the "faulty" drive?
• Try reversing the wires, does it change direction?
• If yes, then you have the drive connected incorrectly.
• If no, you have a faulty drive. Replace the drive.

From what you are describing, I'm thinking you have a faulty drive of it is connected incorrectly in some way. It's not difficult to connect a DC drive to a motor and to tell you the truth, usually if it's not connected correctly then it just won't run at all.
Also, When you post try to include:

• Manufacturer of the equipment.
• Voltages.
• Any other information that is included on the manufacturers data plate on all of the equipment involved.
• Where you are. I.E. Country, City, State.
• What the equipment does.
• Pictures always help too..

All this information gives us a visual of what you are trying to do and we may have experienced it before and could give you a quick concise answer rather than playing 20 questions.

BA

1.If a tacho is connected to the motor for feed back , pl. check the connections of tacho.

If the feedback is derived from winding of the motor , pl. check the conections of that feed back.

In both the case if the connections are interchanged the motor runs with overspeed.

2.Check the power device bridge.

Maybe the switch contacts are welded closed in the reverse direction, and moving the handle doesn't really do anything. (Just a WAG.)

lets assume a DC drive - is it regenerative 4 quadrant type, (12 SCR's) or non regen (6 SCR's)?

If you are using tach feedback and it runs away, is the tach AC, DC, or pulse tach? AC tachs don't work with regen drives. If pulse tach, are the quadrature channels present and connected in the correct relation? If DC, is the polarity correct?

A quick test is to put the drive into armature voltage feeedback and then jog the drive forward. verify the drive turns in the correct direction. If not, correct the field and armature connections. If correct, then jog fwd again and verify polarity of tach feedback on the drive display is correct, correct connections as required, then jog reverse and verify the polarity changes. Once every thing is correct, switch the drive back to tach feedback.

Should be OK now.

Some drives have a parameter that keeps the motor in the same rotation. Reverse the line side of the drive to check for that condition.