
B–62755EN/01
8.TROUBLESHOOTING
349
Position error amount at stop (DGN 300) exceeds a value set by parameter
No. 1829.
(START)
NO
Is it vertical
axis?
Check parameters 1825 and 1829 if they are cor-
rect (see parameter list attached)
Correct
?
Check servo off signal of
each axis. The servo off
function is valid when DGN
G126 bits 0–7 is 1.
Servo off funciton is used to
escape overload of an axis
when the axis is mechani-
cally clamped.
Set correct
parameters.
Perform initial setting
of servo parameters
‘1’?
Check PMC
Note)
Recovered ?
Turn off NC power
and remove power
line of motor then
turn on power
Set digital servo pa-
rameters according
to parameter list
Power sup-
plied?
· Servo amp. is faulty.
· Signal line disconnection between servo amp.
and main CPU or between servo amp. and
option 2 board.
· Main CPU board or option 2 board is
faulty.
Motor power line
is broken
Note) Save current CNC pa-
rameters in a floppy disk or
such before performing ini-
tial setting for safety.
Measure in DC range
Be carefull vertical
axis does not drop.
( No power ) ON
YES
NO
YES
YES
NO
YES
YES
NO
Measure motor power
at terminal board T1
9–10–11 of the servo
amplifier
CAUTION
When the main board is replaced, all the data stored in
memory is lost. Set NC data again, referring to chapter 3
“data input/output” .
8.20
ALARM 410
(EXCESSIVE
POSITION ERROR
AMOUNT DURING
STOP)