
7. TROUBLESHOOTING
B–63445EN/01
156
An attempt was made to return to the reference position without satisfying
the condition that, when the tool is moving toward the reference position
with a positional deviation of 128 or more pulses, at least a one–turn
signal is received.
(START)
Check whether position gain is greater than 128 pulses
(DGN 300) before or during reference position return.
128 or
more
Positional devi-
ation diagnosis
screen (DGN) 300
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 G14.0
ROV2 DGN G14.1
PRM 1421 Fo rate
Check reference position return deceleration signal
DEC1 DEC2 DGN X1000.5, X1001.5
When reference position return is started from deceleration signal 0, feed rate
becomes FL rate.
PRM 1425 FL rate
ROV1 ROV2
00
10
01
11
YES
NO
(1) Next page
Override
100%
50%
25%
Fo rate
Raise the speed
7.11
ALARM 90
(REFERENCE
POSITION RETURN
IS ABNORMAL)
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Countermeasures