Best guess? Wrong setting in multimeter or deep fried motor circuits? I have to admit that, due to bad resolution in the manual photos, I did touch circuit 1s legs and not the small hole above. On the other hand, that’s a tester - shouldn’t short circuit anything?
looks to me like the propper position for the red lead for voltage measurement would be right up (“V”). The lower socket is for resistance, diode, and continuity testing and small current measurement.
looks to me like the propper position for the red lead for voltage measurement would be right up (“V”). The lower socket is for resistance, diode, and continuity testing and small current measurement.
Cheers,
kuraasu[/quote]
Thanks. I did compare my multimeter with Vellemans in the manual, and ended up with the conclusion that I did choose the same as they. I also did gamble and tried the upper V but the result came out as 1485 something. Makes me confused. Will try again tomorrow. Thanks for your fast reply, it’s really appriciated I’ll get back asap.
that’d be 1.485 V, but it’s indicated in mV, hence no decimal point. It’s possible that the adjustment poti is set near its upper limit at first. If that is the case, you should be able to reduce the value by turning the poti. The usual range which the drivers should be set to is 425 to 550 mV.
that’d be 1.485 V, but it’s indicated in mV, hence no decimal point. It’s possible that the adjustment poti is set near its upper limit at first. If that is the case, you should be able to reduce the value by turning the poti. The usual range which the drivers should be set to is 425 to 550 mV.
Cheers,
kuraasu[/quote]
At it again.
Motor 1: 1485
Motor 2: 1600
Motor 3: 0
Motor 4: 1600
Nothing happens when I turn the potis. Tried several different screw heads, no result. Does the potis have a start and end, and is it possible that they end up being out of the screw tracks? I can turn it around forever, no change.
Also, please doublecheck the main voltage, is it 15 V?
Cheers,
kuraasu[/quote]
Yes, I can move the motors from Repetier-Host V0.84. They all answer, but they don’t go smooth. Fan is working, heat bed shows temp, extruder shows temp.
Ok, but until the voltage is set correctly, you should disable the motors (there’s a button in Repetier Host, Manual Control tab) after a few seconds. That switches off the holding current for all motors.
About the driver’s reference voltages: the COM lead should be connected to board ground, i.e. the “-” screw terminal. Make sure the connection is secure there, if possible fix the measuring tip so that it can’t slips off and you have both hands free for the other tip and the screwdriver.
The measurement point on the driver is the small metallic hole (“via”) above the driver IC, as depicted in the instructions. If you have, use an insulating screwdriver (ceramic or plastic) to turn the poti; if not, make sure that the screwdriver doesn’t touch any other metallic part on the board or the measuring tip.
Ok, but until the voltage is set correctly, you should disable the motors (there’s a button in Repetier Host, Manual Control tab) after a few seconds. That switches off the holding current for all motors.[/quote]
Blue screw terminal black on black, red och white(red) cable? With what setting on the multimeter?
Yes, black/COM on the “-” port, red/V on the “+” port. The other way around won’t destroy anything, you’ll just see a negative voltage instead of a positive one on the multimeter. Range should be the first setting above the expected value, probably you’ll have a 20 V setting there.
About the Y driver: is the 1 left or right in the multimeter display? Left would simply mean “overrange”, i.e. more than 2 V.
If that’s not the error, switch the motors and also the Pololus between Y and one of the other axes (e.g. X) and test whether the problem shifts to the other port in one of the combinations or not. This way, you can find out the location of the error, motor wiring (stays at Y motor, even when the motor is connected to the X port), Pololu (switches over to X when switching the Pololu), or board (stays at Y port all the time).
[quote=“kuraasu”]About the Y driver: is the 1 left or right in the multimeter display? Left would simply mean “overrange”, i.e. more than 2 V.
If that’s not the error, switch the motors and also the Pololus between Y and one of the other axes (e.g. X) and test whether the problem shifts to the other port in one of the combinations or not. This way, you can find out the location of the error, motor wiring (stays at Y motor, even when the motor is connected to the X port), Pololu (switches over to X when switching the Pololu), or board (stays at Y port all the time).[/quote]
Switch at the circuit board between x and Y connection, or physical motors including resoldering?
Just switch the connectors and, in a second step, the Pololus. Check whether the motors run well in each combination and whether the reference voltage on the “odd” Pololu can be set now.
For cross-checking, you can also measure the voltage on the “good” Pololu. It should stay the same independent of which axis the Pololu is driving.
Just switch the connectors and, in a second step, the Pololus. Check whether the motors run well in each combination and whether the reference voltage on the “odd” Pololu can be set now.
For cross-checking, you can also measure the voltage on the “good” Pololu. It should stay the same independent of which axis the Pololu is driving.[/quote]
Define pololu. I’m not totally sure I understand what a pololu is
[quote=“TomWen”][quote=“kuraasu”]No need for any soldering.
Just switch the connectors and, in a second step, the Pololus. Check whether the motors run well in each combination and whether the reference voltage on the “odd” Pololu can be set now.
For cross-checking, you can also measure the voltage on the “good” Pololu. It should stay the same independent of which axis the Pololu is driving.[/quote][/quote]
So, problem solved. It was all about the screw driver not getting traction when adjusting current.
Now I have 435-455 on all 4 motors.
Does it have to be exactly 0.425?
Does it have to be exactly the same on all motors?
[quote=“TomWen”]1. Does it have to be exactly 0.425?
2. Does it have to be exactly the same on all motors?[/quote]
Both cases: no.
Any value between 0.425 and 0.55 V will be fine, for any motor. Lower means that both motors and driver will run cooler, but higher values can be chosen when more torque is required for the motor (e.g. when you notice that the motor skips steps during printing).
I’ll get back asap.