[Factory Guy]

The machine is a vertical lathe with a 16i Fanuc controller. It gets a 926 FSSB alarm about 2 times every shift. Has anyone else had this problem with a 16i controller? I searched FSSB and found another thread, but the replies were basically from the book, bad axis board and check fiber optic connections. We are swapping boards out tomorrow from another machine. Any help would be greatly appreciated.

[bob1371]

I have seen this on 2 different machines. Both were fixed by replacing the Fiber Optic cable from axis control card to servo amps. I believe the axis control card will cause this also.

Bob

[wanchai101]

This alarm our machine had to occur. You must to change the Amplifier board of servo.Then alarm will be clear all.

[mithunrams]

dear friends

For FSSB alarm u should check the following elements.

1.Optical fibre cable of cnc controller
2.i/0 module, if possible replace with the next machine.
3.power supply card of system monitor.
5.24 v supply/ DC voltage(proper or any short)
4.PSM contactor(if it is not actuating in time, dis will happen-den replace it)

[rai]

Sir,
In my case 926 FSSB alarm comes as spindle load increase.
without load no problem.
I hv checked optical cables, 24DC SMPS, etc but no sucess.
Is it possible due to linear scales too?
As this mache having linear scales.
kindly somebody help me.

dear friends

For FSSB alarm u should check the following elements.

1.Optical fibre cable of cnc controller
2.i/0 module, if possible replace with the next machine.
3.power supply card of system monitor.
5.24 v supply/ DC voltage(proper or any short)
4.PSM contactor(if it is not actuating in time, dis will happen-den replace it)