
B--63005EN/02
9.TROUBLESHOOTING
621
This alarm is issued if a serial spindle amplifier (SPM) does not enter the
normal startup state when the CNC is turned on.
This alarm is not issued once the CNC system including the spindle
amplifiers has started up normally. It is issued if a fault occurs in the
power--on process.
The probable causes include the following:
D Contact failure, wiring error, or connection error of the connection
cable
D The CNC is turned on when a spindle amplifier is in the alarm state.
D Parameter setting error
D Defective printed circuit board on the CNC
D Detective spindle amplifier
Up to four serial spindle amplifiers (SPMs) can be connected per path.
Note, however, the number of amplifiers that can be connected differs
depending on the model, number of paths, and configuration. Refer to the
Connection Manual (Hardware).
Motherboard
(Main CPU board)
Sub--CPU board
PSM (first)
PSM (second)
9.21
ALARM 750
(SPINDLE SERIAL
LINK
STARTUP FAILURE)
Causes and actions
D Connection
[Diagram of connection
of up to two amplifiers
per path]