408 Servo Alarm

[suleman_mani]

I am having problem with this 1989 model of Mori seiki SL-15,
Master board
A16B-1212-021
MEM: A028-0098-B511
After Solving the 911 Parity Alarm and entering diagnostic parameters a different problem have come:

408: servo alarm (Serial not ready)

what does it means ? and how can i solve this problem. Please reply

[maxvic]

Does it tell you what axis? I was having a similar problem on my mill (equipped with a Fanuc OM) and it would say "servo alarm x axis" It turned out to be a dirty servo motor connector. Check and clean all your motor connections, coolant can get into them and inhibit connection.

[Jaba]

hi

if the alarm no. is 408 it refers to a problem with serial communication between
the main controller and the spindle controller.

This alarm can only occur if the spindle controller did not power up correctly during machine power up procedure.

1) check the fiber optic cable between the main controller and the spindle controller is correctly fitted in each plug.
2) Once powered up, check that the spindle controller is in fact powered up. If it is not, check supply fuses to the spindle controller (and associated control fuses)
3) You are attempting to start the spindle controller when a pre-existing alarm is registered on the spindle controller. Only Alarm AL-24 is exempt from this condition. Clear any existing errors or alarms on the spindle controller, power down the machine (at the main switch, NOT the control power buttton) then restart it.

If it still occurs, check for any loose connections associated with the spindle controller.
Other than that, it may also be a hardware fault (ie PCB) or an error in the parameter table. (check that all the parameters pertaining to the spindle are
the same as listed in the actual machines written copy of the parameter table)

Hope this helps

[JulianS]

Your problem is about the optic cable, check all the cable on servodrives,

Regards

[Nymisis]

generally, its just carbon in the encoder ... power down the machine and pull all 4 brushes on the servo ... blow em out and replace the brushes ... if your brushes are worn out this would be a good time to replace em ... as for the cables, unless you got coolant in the connectors i doubt you'll have to worry much about them.

[ccs007]

Refer to manual, this is the alarm for spindle amplifier does not start normally when power is applied. Please check your serial cable and spindle amplifier( alarm code on 7 segmen LED).

[redcobra]

This problem can be the main board,Memory or I/o board not the spindle drive. Sorry to say there is only the shotgun approach for this problem one at a time

[VynnyX]

hi

if the alarm no. is 408 it refers to a problem with serial communication between
the main controller and the spindle controller.

This alarm can only occur if the spindle controller did not power up correctly during machine power up procedure.

1) check the fiber optic cable between the main controller and the spindle controller is correctly fitted in each plug.
2) Once powered up, check that the spindle controller is in fact powered up. If it is not, check supply fuses to the spindle controller (and associated control fuses)
3) You are attempting to start the spindle controller when a pre-existing alarm is registered on the spindle controller. Only Alarm AL-24 is exempt from this condition. Clear any existing errors or alarms on the spindle controller, power down the machine (at the main switch, NOT the control power buttton) then restart it.

If it still occurs, check for any loose connections associated with the spindle controller.
Other than that, it may also be a hardware fault (ie PCB) or an error in the parameter table. (check that all the parameters pertaining to the spindle are
the same as listed in the actual machines written copy of the parameter table)

Hope this helps

Turning the main supply to the machine off clears this code 408 after a crash.