
B-63945EN/02 11.TROUBLESHOOTING
- 599 -
11.12 ALARM PS0090 (REFERENCE POSITION RETURN IS
ABNORMAL)
Contents
Reference position return was executed when the following condition
is not satisfied:
The CNC received one rotation signal at least one time when the axis
is moving to the reference position at a speed higher than a speed
equivalent to 128 pulses of position error amount (DGN300).
Countermeasures
F
5000/3
START
Check whether position gain is greater than 128
pulses (DGN 300) before or during reference position
return.
Position error amount :
DGN 300
128 or more
YES
NO
(1) Next page
Raise the speed
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
]
Detection unit : Move amount to a command pulse (usually 1
µ
m)
In metric machine, if the no. of digits below decimal point is
4 on the position display screen, detection unit is 0.1
µ
m.
G
detection unit [
m/PLUSE]
Check reference position return deceleration signal
*DEC1 to *DEC8 DGN 009.0 to 009.7
When reference position return is started from deceleration signal 0, feed
rate becomes FL rate.
PRM 1425 FL rate
Position error =
Check rapid traverse override signals :
ROV1 DGN 014.0
ROV2 DGN 014.1
PRM 1421 Fo rate
ROV1 ROV2
Override
0 0 100%
0 1 50%
1 0 25%
1 1 Fo rate