1
\$\begingroup\$

I've got a forklift with a partially functional motor controller. As I've got a bit of experience with electronic engineering (as opposed to electrical), I have a few questions that I was hoping to get some help with.

The current setup looks like this:

Current Setup

The original controller is very hard to get hold of. A close alternative with very similar specs is available. However, it doesn't have the "FWD Input" or "REV Input". For the original controller, the internal block diagram is as follows:

Internals

The new controller is as follows:

New controller

The contactors that the "FORWARD" and "REVERSE" control are Albright DC182.

I guess, my question is, what might the "F/R Contactor Driver" (in the block diagram) do? Because as far as I can tell, the contactors works by connecting completing the circuit across the coils.

Any help would be greatly appreciated.

\$\endgroup\$
  • \$\begingroup\$ It's going to be the part the outputs the current to actuate the contactor. \$\endgroup\$ – Hearth Oct 11 '18 at 13:07
  • \$\begingroup\$ That's what I assumed, however, how does the second controller actuate the contactor? I'm struggling to see on the DC182 what current is required to operate the contactor. \$\endgroup\$ – CircularRecursion Oct 11 '18 at 13:12
  • \$\begingroup\$ Do you have a datasheet somewhere? The info given on the site is pretty unhelpful. \$\endgroup\$ – Hearth Oct 11 '18 at 13:14
  • \$\begingroup\$ The last page of this document is the best I've managed to get my hands on: albrightinternational.com/wpcms/wp-content/uploads/2015/07/… \$\endgroup\$ – CircularRecursion Oct 11 '18 at 13:18
  • \$\begingroup\$ What models are the old and new controller? \$\endgroup\$ – Phil G Oct 11 '18 at 13:42
0
\$\begingroup\$

The F/R contactor driver doesn't seem to have any function in normal operation, but what it does do is drop out the feed to the contactors in the event of a coil short - "Forward, reverse, and bypass contactor driver outputs are internally protected against shorts in the contactor coils" from http://assets.curtisinstruments.com/Uploads/DataSheets/1204x05manual.pdf

On the new arrangement such a short would only be dealt with by the control fuse blowing. This results in a loss of drive, on the old arrangement, there's the possibility of braking to a halt using the reversing contactor if the forward contactor fails.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.