Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 38)

Chapter 4: Troubleshooting PC NC Maintenance Manual
4-17
Contact a Yaskawa customer service representative.
(23) Alarm Number 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, either
the command speed must be lowered or the gain must be
increased.
If the motor does not rotate, the servo unit may be faulty.
Contact a Yaskawa customer service representative.
Alarms Not Indicated by Alarm Numbers
(1) No Display is Given on the CRT
If nothing is displayed on the CRT, the CRT itself may be faulty,
or the display circuit or connection cables may be faulty. When
nothing is displayed even if the PC NC power can be turned ON,
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
• Verify the bit status of UO monitor #3000.
D2 = 1
Other bits (DO, D1, D3 to D7) = 0
• Verify the mode display given in the normal display area
on the screen.