Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 74)

Chapter 4: Troubleshooting PC NC Maintenance Manual
4-53
Remarks
AL-21:Emergency stop defective performance
Error Contents Did not stop within ten seconds after specified the emergency stop.
Detection Methods If the following condition exists, the current is interrupted and the
alarm is displayed. (Emergency stop signal EMG is OFF) / (during
driving) / (the above two conditions were consistent for 10 seconds.)
Cause and measures
AL-30:Encoder signal disconnection
Error Contents Motor encoder signal conductor (A/B phase of 2 CN) disconnection/
improper connection
Cause and measures
Connector
number
Name Content Note
2CN-10 24V Winding switch command signal2CN-10, 11= 24V: L winding —
2CN-11 CC = 0V: H winding —
2CN-12 CA1 Winding switch state signal 2CN-12, 13=24V: L winding U1-09bit 14 (CHWA)
2CN-13 CA2(0V) = 0V: H winding Lighting: H winding
Cause Measures
Damping torque by discharging
torque drive is reduced. Check that neither the control parameter (C1-24) setting nor the TLL,
TLH l are specified.
Change the drive circuit so that neither TLL nor TLH can operate dur-
ing emergency stop.
Motor code improper selection Confirm the control parameter (C1-25) setting and refer to the setting
list.
Load moment of inertia is large. Check the acceleration/deceleration time to the rated speed are ten
seconds or more (However, set to C1-10:0.1sec).
Reduce the inertia moment.
Enlarge the capacity of the inverter.
Control card fault Exchange unit (exchange control card)
Cause Measures
Encoder signal conductor disconnection,
improper connection, and the connector
omission Check encoder signal conductor wiring.
Control card fault Exchange unit (exchange control card)