Help with Motor Control Board - ProForm treadmill

[budm]

Re: Help with Motor Control Board

166VDC is fine and that is what I expected. I am still wondering about the solder joints on those two Zener diodes that the pads look to be damaged and you were getting 6.6V and then 15V, there may be bad joints on the board.

[Crrose]

Re: Help with Motor Control Board

I thought I would try each individually since it couldn't hurt. I get 166.6 on the one closest to the relay and -49 on the other.

I can also hear the relay clicking on and off which it wasn't doing before.

[Crrose]

Re: Help with Motor Control Board

I just soldered wires to the large caps. When I turn the power on do I test them individually or hook both + to + and - to - ?. Everything is hooked back and put together like it is supposed to be.

[budm]

Re: Help with Motor Control Board

Heat is only needed when the motor is running and since the motor is not working you do not have to worry about heating up the bridge rectifier or the power MOSFET.
We need to know if the main caps on the motor driver board has Voltage on the main cap or not. The relay looks to be for soft-start circuit.
The MOSFET is connected in series with the motor and it is driven by PWM signal to the Gate.

[Crrose]

Re: Help with Motor Control Board

Ok I have some 18/2 lamp wire I can use.

[selldoor]

Re: Help with Motor Control Board

I hooked by mower battery up and the relay opens and closes. Tested the Ohms and get .6 when set at 200ohms.

Hurrah success- a little success but success -

Wire guage ?? thin mains wire like for a low wattage bedside lamp

[Crrose]

Re: Help with Motor Control Board

I hooked by mower battery up and the relay opens and closes. Tested the Ohms and get .6 when set at 200ohms.

[Crrose]

Re: Help with Motor Control Board

I just realized my mower is 24v I'll try to get relay to click with it.

[Crrose]

Re: Help with Motor Control Board

I can't hook up my board to the heat sink without attaching it to the mounting frame. Once it is attached to the mounting frame there is no access to the bottom of the board. I guess I could try to solder some wire to the bottom of the caps and hook it back up. Does it matter the size of wire?

No click to relay but I was only using an 18v battery so may not be enough power.

[selldoor]

Re: Help with Motor Control Board

Dont suppose you heard it click? - what polarity did you use battery plus to ???
I meant you to wait until budm came back on to check about the diode.

[Crrose]

Re: Help with Motor Control Board

Ok if I put my battery to RLY1 and RLY2 and test ohm at AC1 and AC2 I get no reading. If on diode mode its 1.452

[selldoor]

Re: Help with Motor Control Board

Just reread post 10 and your comments on your meter if I have the test points correct I think that means the bridge is ok

[selldoor]

Re: Help with Motor Control Board

Sorry I meant the nothing in ohms mode post10

AC1 to DC+ I get .527, reversed nothing, AC2 to DC- is .522, reversed is nothing. AC1 to AC2 nothing either way. This was done on diode setting. When set to 2000 ohms there was no reading at all.

No you cant apply mains power without the heatsinks and no you cant test the big caps without powering up
In pictures on the net of these boards they have the heatsink part attached
can you do that or is yours attached to the frame? or wont the cables reach?

As mentioned before an alternative would be to solder wires to the caps.

[Crrose]

Re: Help with Motor Control Board

I have a cheaper DMM it doesn't give you OL. In diode mode it starts at 1. and if no reading it stays that way, if I get a reading the .1 disappears and get a reading.

Been searching for a cheap used FLuke but can't find one.

[Crrose]

Re: Help with Motor Control Board

If I hooked the power up to the board and powered it on would it do any damage to it since the heat sink would not be hooked up?

[selldoor]

Re: Help with Motor Control Board

Ok when you say nothing do you mean the same as touching the probes together 0.00 or perhaps a single 0 on the left of the meter screen? ( or OL -something meaning off scale or overscale)

I think these are the points to check the relay - you apply the voltage
to points R1 and R2 and take an ohms reading on AC1 to AC2 - should go from
open offscale or OL to 0.00 or close to

Perhaps wait for budm to comment as he did mention a zener in parallel and I dont know if he meant care as the reading wouldnt work or CARE as in damaging the diode

[Crrose]

Re: Help with Motor Control Board

Can I test them without power to the board? When I do I only get .30v

[Crrose]

Re: Help with Motor Control Board

I did the same with the relay and got these results if it means anything.
Leg 2-3 = 1.435
Leg 2-4 = 1.710
Leg 2-5 = 1.790
Leg 3-2 = 1.419
Leg 3-4 = .961
Leg 3-5 = 1.239
Leg 4-2 and 4-3 = nothing
Leg 4-5 = .565
Leg 5-2 and 5-3 = nothing
Leg 5-4 = .509

[budm]

Re: Help with Motor Control Board

Are you getting 160VDC at the two legs of those two main filter caps?

[Crrose]

Re: Help with Motor Control Board

AC1 to DC+ I get .527, reversed nothing, AC2 to DC- is .522, reversed is nothing. AC1 to AC2 nothing either way. This was done on diode setting. When set to 2000 ohms there was no reading at all.