Originally Posted by
DNS1
Don't bother with the TM4, E-Stop test. You wouldn't be able to run G01 in position if the Dynapath controller was at fault.
I believe your tach is out of adjustment.
The tach value is a static value that doesn’t change from machine to machine with the same tach. The tach adjustment is for conditioning the input signal of the tach. If the tach gain is too high clipping will occur. If the tach gain is too low trajectory will be affected.
Also if the tach is set too high the signal pot will run out of adjustment. If the tach is set too low the balancing pot will run out of adjustment.
Setting the J325 to factory specification:
I recomend that you save all of the current setting on a spread sheet and mark the individual axis cards.
Setup Procedure for Servo Dynamics Servo Drives
1. With the boards removed from the chassis, hook a digital ohm meter from TP1 to the left side of R19, adjust R44 for 7.9K Ohm.
2. With one lead of the meter on TP1 and the other lead on:
TP2, adjust Aux for 0 ohms
TP3, adjust Sig for 4.8K ohms
TP4, adjust Tach for 4.4K ohms
TP5, adjust CMP for 570 ohms
NOTE: All plugs must still be disconnected
3. Adjust Current Limit to Maximum Clockwise (CW).
4. Install the modules and turn power on.
5. Reset E-stop, reference machine. Go to mode select 5 (setup), key in TM4, Enter (servo adjust). Then mode select 0 (jog), enter 1 (medium jog), set feederate override pot to maximum CW.
6. Adjust balancing pot for zero standing axis lag +/-.0002
7. Jog the axis, adjust Signal pot for .015” axis lag. (All axis should have the same value or circular milling will be irregular. )
This is the procedure that my Tree 325 manual specifies. I have used this simplified procedure on my 325 and have found that after you have finished step 7 no other adjustments are required and the servo/amplifiers are back to factory specifications.
This will solve the servo balancing issue, but you may still have rapid halts. If this is still an issue, measure the voltage across the Servo drives capacitor while rapiding(as fast as you can) with jog. I believe 89 Volts is too low. If this is the case you will need to replace the capacitor.