
B–63505EN/02
7.TROUBLESHOOTING
271
*DRDY signal is turned on before MCON signal is turned on. Or *DRDY
is not turned off after MCON signal is turned off.
1 Servo amplifier module (SVM) is faulty.
2 Between servo amplifier module (SVM) and main board is faulty.
3 A servo module on the main board is faulty:
4 Main board is faulty.
NOTE
1 The configuration and mounting locations of the mounted
modules vary with the specification of the main board. For
details, see Subsec. 2.2.1.
2 When the main board is replaced, all the data stored in
memory is lost. Set the NC data again, referring to Chapter
3 “INPUT AND OUTPUT OF DATA”.
Power on sequence (NCàServo amplifier)
=*Power supply unit failure
=*Input fuse disconnection
=* Servo amp. alarm (1 to 9,b)
=*Emergency stop signall (*ESP)
=*100VAC Lack of 3–phase input voltage
=*System alarm (ALM900 to 973)
=*Servo alarm (ALM400 to 417)
=*Emergency stop (*ESP)
=*SVF1 to 4 (Servo off signal)
Servo enable
Power ON
Position, velocity
control ready (*MCON)
Servo amp. ready
(*DRDY)
S Main board
DV
RV
RV RLY MCC
DV
Servo amplifier (module)
JSnA
–10
–20
*MCOM
*DRDY
–10
–20
JSnB
7.17
ALARM 404 (*DRDY
SIGNAL TURNED ON)
D Causes