Hello,
i want to ask you guys some advice to help me figure out the problem of my fanuc spindle drive that keeps blowing up the thyristor modules and high load at idle running.
machine : takisawa ts20 lathe
drive specs spindle drive:
- A06B-6044-H112
- Topboard A20B-1000-069
Motor Specs:
- AC spindle Motor
- Model 12
- 11/15kW
The problem:
this machine has been not used few years and now we want to get it back in service to produce.
when i start running the machine in manual it runs good but the load meter keeps at 50% and when i start in M42 it even goes to maximum load when starting
- Thyristor modules: the high load first look like one of the igbt thyristor modules was defective .
i replaced them all and 2 of the 4 where defective, the problem was not gone still high load
- Spindle Motor: i checked wiring , motor, cleaned fan , checked with megometer (also wiring), all good
- Top board: i replaced top board with another board i had here , problems stays
- Adjusting RV settings: with the servo manual i adjusted the rv settings like factory and tryed to get it better checking with a scope and testing with the troubleshooting, problem stays
- Checked all fuses
- Replaced cooling fan in drive
- Replaced mother board
- checked parameters (if anyone has file so i can compare would be great , maybe theres a fault here causing it??)
- ....
now im little desperate looking what can cause this still ? could it be parameter settings?
hope someone had this before to or knows what can cause this ,
thanks a lot!