Siemens Reversing the direction of rotation of the DC motor

[dodo41]

Hello everyone. I have 1 Siemens "1GG6164-0JH40-6VV5-Z" Model DC Motor. It works in 2 phases.
What should I do to reverse the rotation direction of this motor?
I have marked the B1 and B2 Terminals in the Photo below. B1 and B2 are phase ends.

 

[James]

Normally with a dc motor the terminals would be marked A1 and A2 (armature)
also sometimes F1 and F2 (field) will be there too.
to reverse direction, swap the armature polarity, leave the field alone.

 

[dodo41]

Thank you. In the electrical project to which the motor was connected, terminals were marked as B1 and B2. As for what you said, can you explain a little more? Since I don't speak English, the translation was insufficient.