[jannie@eelectro]

Hello everyone i need some help with my Harrison alpha 550s
when i start it up it gives me spindle speed monitor alarm 15 manual says encoder or encoder cable ive tested encoder it is fine tested the cables also no problems there. what is funny is acording to manual this fault will appear when marker pulse is missed while spindle running.my spindle cant run as the alarm switch off the power to spindle drive and alarm comes up on startup of control
in the cabinet at the back is a io board from harrison with a small cpu board with a red led that flashes fast.the encoder signals go to this board through a 26ls32 ic wich i tested and is ok
how do i diagnose this problem please help How do i get in diagnostic mode

[cncmakers001]

Hello everyone i need some help with my Harrison alpha 550s
when i start it up it gives me spindle speed monitor alarm 15 manual says encoder or encoder cable ive tested encoder it is fine tested the cables also no problems there. what is funny is acording to manual this fault will appear when marker pulse is missed while spindle running.my spindle cant run as the alarm switch off the power to spindle drive and alarm comes up on startup of control
in the cabinet at the back is a io board from harrison with a small cpu board with a red led that flashes fast.the encoder signals go to this board through a 26ls32 ic wich i tested and is ok
how do i diagnose this problem please help How do i get in diagnostic mode

If you are sure the encoder and the encoder cables are fine, then maybe you can check the CNC controller of the spindle driver.

[jannie@eelectro]

The spindle drive is working if i manuall set to run its not a fanuc drive its mitsubishi
some how i thing the controller think the spindle is running that is why the alarm the alarm then switch off power to spindle drive
as i understand there is a procedure to get into diagnostig and alarm pages for harrison alpha lathes not the normal fanuc diagnostic page
i need to know this procedure so i can see what is the problem