
7. TROUBLESHOOTING
B–63505EN/02
276
Position detection signal line is disconnected or short–circuited.
Check the details using the CNC’s diagnostic fucntion.
#7 #6 #5 #4 #3 #2 #1 #0
0200 FBADGN
0201 ALD EXPDGN
↓↓
FBA only is set to 1.
The pulse coder is discon-
nected (software)(Note).
FBA and ALD are set to 1. The built–in serial pulse coder is
disconnected.
FBA, ALD, and EXP are set to 1. The separate position detector
is disconnected (SCALEn).
NOTE
This alarm is related with full–closed system.
1 Signal cable is disconnected or short–circuitted.
2 Serial pulse coder or position detector is faulty. Refer to Note 1.
3 A servo module on the main board is faulty:
See Note 2.
4 Main board is faulty. Refer to Note 3.
NOTE
1 After the pulse coder is replaced, reference position or
machine’s standard position is different from former one.
Adjust and set it correctly.
2 The configuration and mounting locations of the modules
vary with the specification of the main board. For details,
see Subsec. 2.2.1.
3 When the main board is replaced, all the data stroed in
memory is lost. Set NC data again, referring to chapter 3
“INPUT AND OUTPUT OF DATA”.
PC
Linearscale
(SERVOn)
(SCALEn)
n is an axis number
Servo amp.
module
(JFn)
(JSnB)
7.21
ALRAM 416
(DISCONNECTION
ALARM)
Point
Causes