B–63505EN/02
7.TROUBLESHOOTING
267
An error is generated in communication with serial α pulse coder.
Check the details by the diagnostic function of the CNC.
#7 #6 #5 #4 #3 #2 #1 #0
0202 DTE CRC STBDGN
#5(STB) Stop bit error has generated.
#6(CRC) Serial communication error has generated.
#7(DTE) Data error has generated.
1) #7(DTE):Response from serial α pulse coder is absent.
1 Signal cable is disconnected
2 Serial α pulse coder is faulty. å See Note 1.
3 +5V to the serial α pulse coder is lowered.
2) #6(CRC),#5(STB):Serial communication is in faulty
1 Signal cable (between the pulse coder and servo amplifier module
and between the servo amplifier module and main board) is faulty.
2 Serial α pulse coder is faulty å See Note 1.
3 Failure of the servo interface module, servo control module, or
servo module on the main board. å See Note 2.
4 Main board is faulty å See Note 3.
NOTE
1 After the serial pulse coder is changed, reference position
or machine’s standard point is different from the one before
replacement. Therefore reset and adjust it again.
2 Replace the module corresponding to the axis for which an
alarm was issued. The configuration and mounting
locations of the modules vary with the specification of the
main board. For details, see Subsec. 2.2.1.
3 All the data stored in memory is lost when the main board
is changed. Set NC data again, referring to Chapter 3
“INPUT AND OUTPUT OF DATA”.
7.14
ALARM 351 (SERIAL
α PULSE CODER
COMMUNICATION IS
ABNORMAL)
Points
Causes