Replacing a servo driver

[Vancbiker]

Did you turn the number screw to ?6? on initial power up, then move it to the number required by the controller? On a Mazak w Mitsu drives, that initialization process is required every time you change a drive. I would find the manual or call Mitsu, they are awesome and support their products.

That procedure does not apply to the drive model the OP has.

 

[LOTT]

The wire from the encoder to the drive had several contacts with good continuity straight through, and several that didn't seem to be connected. I pulled the encoder off and am trying to troubleshoot, is there a standard pin out for what should be ground and common, and which should be the outputs?

 

[BugRobotics]

The wire from the encoder to the drive had several contacts with good continuity straight through, and several that didn't seem to be connected. I pulled the encoder off and am trying to troubleshoot, is there a standard pin out for what should be ground and common, and which should be the outputs?

What is the encoder part number?

 

[LOTT]

The servo is a Mitsubishi HC-SFS102, the encoder doesn't have a part number (at least in English).

 

[LOTT]

Encoder

 

[BugRobotics]

Is there a part number on the encoder cable? Is there a connector in between the encoder and the drive?

 

[BugRobotics]

This is what I found in the manual thus far.

Page 257 of 402:



Controller Side:
Page 58 of 402:

 

[LOTT]

I couldn't find the manual for the servo, where are you finding that? Is it in the drive manual?

 

[BugRobotics]

I couldn't find the manual for the servo, where are you finding that? Is it in the drive manual?

Yea in the drive manual. Posted a link earlier in the thread if you don't have it already.

 

[LOTT]

Yea in the drive manual. Posted a link earlier in the thread if you don't have it already.

I have the drive manual, just didn't occur to me that it would have the info, though it retrospect of course it would.

So, hook ground to N and 5VDC to S and then checking A through D for voltage while rotating the shaft?

 

[BugRobotics]

I have the drive manual, just didn't occur to me that it would have the info, though it retrospect of course it would.

So, hook ground to N and 5VDC to S and then checking A through D for voltage while rotating the shaft?

I'd recommend taking some voltage readings at the cable end to verify as I'm not at my computer to look.

I can see pin S as positive voltage connected to P5 at the amplifier. I see LG (control common or "ground") connected to pin R. Pin N is the cable shield and shouldn't be used a ground return. I believe your encoder channels will be on pins C and D

 

[Vancbiker]

......So, hook ground to N and 5VDC to S and then checking A through D for voltage while rotating the shaft?

Not sure what you would see when trying to check voltage. That style of Mitsu encoder sends data in a serial format rather than pulses like a differential encoder. Almost certainly a proprietary format. If you had an oscilloscope you might be able to capture data stream info but I don't know how you would ever figure out if it was good or not. Swap to a known good encoder.

 

[BugRobotics]

Well there you go. Learned something new today.

Tangent: Do you know why they use this serial protocol over standard A/B or differential signaling? You mentioned proprietary so just to lock the user into buying parts from the OEM?