Yaskawa Yasnac PC NC - Manual (Page 173)

YASNAC PC NC Operating Manual Chapter 4: Maintenance
4 - 15
(23)Alarm No.: 3451 and 3452 (Follow-up Error)
This alarm occurs when the follow-up error exceeds the value set for the servo unit parameter.
The servo unit detects the alarm.
If this alarm occurs during axis feed over a long distance, it is necessary to either lower the
command speed or increase the gain.
If the motor does not rotate, the servo unit will be faulty.
Contact your Yaskawa representative.
4.1.7 Alarms Not Indicated by Alarm Numbers
(1) No Display is Given on the CRT
If nothing is displayed on the CRT, the CRT itself might be faulty or the display circuit or
connection cables might be faulty. When nothing is displayed even if the power can be turned
ON to the PC NC, check the cable connection to the operation panel and also the connectors.
(2) Handle Mode Operation is Impossible
(a) Handle mode signal is not input
• Check the bit status of UO monitor #3000.
D2 = 1
Other bits (DO, D1, D3 to D7) = 0
• Check the mode display given in the normal display area on the screen.
(b) Axis selection signal is not input
• I/O monitor
Check whether one of the following bits is ON.
#3070
D
0
= l 1st axis
D
l
= l 2nd axis
D
2
= 1 3rd axis
D
3
= 1 4th axis
D
4
= 1 5th axis