
B–62075E/04
5. TROUBLESHOOTING
312
Check whether position gain is greater than 128 pulses
(DGN 3000) before or during reference position return.
128 or more
Position error
amount : 3000
Check feed rate command:
PRM 1420 F : Rapid traverse rate (mm/min)
PRM 1424 Manual rapid traverse rate (mm/min)
PRM 1825 G : Servo loop gain (0.01sec–1)
F 5000/3
Position error=
G detection unit [µm/PLUSE]
Detection unit : Move amount to a command pulse (usually 1µm)
In metric machine, if the no. of digits below decimal point is 4
on the position display screen, detection unit is 0.1 mm.
Check rapid traverse override signals :
ROV1 DGN 006.5 (M/T series)
101.5 (TT series)
005.5 (Multi–puth)
ROV2 DGN 006.6 (M/T series)
101.6 (TT series)
005.6 (Multi–puth)
Check reference position return deceleration signal
*DECn (DGN)
064.5+4(n–1) (M/T series)
128.5+4(n–1) (TT series/Multi–path)
When reference position return is started from deceleration signal 0, feed rate
becomes FL rate.
PRM 1425 FL rate
ROV1 ROV2
00
01
10
11
YES
NO
(1) Next page
Override
100%
50%
25%
Fo rate
Raise the speed
Absolute
pulse coder?
NO
(ST ART)
First reference
position return after first
power–on of pulse
coder?
Turn the NC power off then
back on, then perform refer-
ence position return.
NO
YES
YES
Countermeasures