I recently got my hands on a used hospital bed.It has 2 110v gear reduction motors on it with what seems like plenty of torque to do the job. It came with the hand controller and the main unit that drives every thing.It has its own power supply and bi-directional controll via 110v relays.
Upon opening up the hand control unit I have determend that there is one “signal wire”(one wire with power on it to the hand controller) with a constant 18v ac then two wires for each motor for direction by push button on the hand control. Jumping the “signal wire” from one motor wire to the other before the relay box…turns the motor in oppasite directions. I guess my question is… can I use a 8055 and the units relay controller to… control the two motors? It sure looks possable but i would really like you guys imput on it as I am an idiot when it comes to electronics…Any help would be awsome…Thanks in advance!
You can replace (bypass) the buttons in the hand control unit with relay contacts.
Please see this thread how the relay coil have to be connected between the digital output and the CLAMP terminal of the K8055: viewtopic.php?f=3&t=5370
You need also a DC power supply for these relays.
Ok so I need to use a relay to controll a relay? Is that the only way to replace the push button on the hand controller to be controlled with the k8055?
Yes, this is the easiest (only) way to do it.
Ok thank you very much for your info. Can you suggest a relay and or some specs to go by if I am planing on using 4 relays? As I don’t want to damage the 8055.
Here is one alternative: velleman.eu/products/view/?id=340853
Any relay having the coil current less than 100mA will do the job.
You can calculate the coil current using this formula: Coil_current = Coil_voltage/ Coil_resistance