Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 73)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-52
AL-13:Control circuit low voltage
Error Contents The control circuit power supply went below the low voltage detection
level (200V).
Detection Methods Output to the control card formatting the power supply voltage signal
for control circuit by the gate driver (7CN-37).
If control circuit low voltage detection level (200V) is lower, the cur-
rent is intercepted and the alarm is displayed.
Cause and measures
AL-20:Winding switch defective performance
Error Contents The wiring switchover drive did not complete in setting time or less
(two seconds).
Detection Methods Winding switch command signal CC(2CN-11) to the magnetic contac-
tor for the winding switch is provided. Winding switch state signal
CA1(2CN-12) from the magnetic contactor for the winding switch is
provided.
An alarm will occur if the winding switch command signal and state
signal to the magnetic contactor continue the disagree state
(CHWE=OFF) for two seconds.
Cause and measures
Cause Measures
Control power voltage (A1/r, A2/t) is
low. Change the power supply voltage in the specification value by
changing transformer tap.
Control power supply input connector
(P1, N1) connection is defective. Confirm that there are no loose control power input connections.
Control card fault Exchange unit (exchange control card)
Cause Measures
Motor code improper selection Confirm the control parameter (C1-25) setting and refer to
the setting list.
Lack of drive power supply of magnetic
contactor for winding switch (disconnec-
tion and improper wiring) Check whether a regulated voltage is applied to the wind-
ing switch contactor (17) and the terminal (18).
Improper connection/disconnection of sig-
nal conductor of magnetic conductor for
winding switch Check wiring according to the interconnect chart.
Exchange the magnetic contactor for the winding switch
with a non-defective one.
Control card fault Exchange unit (exchange control card)