Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 59)

PC NC Maintenance Manual Chapter 4: Troubleshooting
4-38
Cause and measures
15:The power supply frequency error
Error Contents The power supply frequency excessive deviation (deviation
≥
6% fre-
quency)
Detection Methods 50/60Hz cannot be distinguished because the power supply frequency
was not in 50Hz±6% or 60Hz±6% when main power is supplied (after
the second attempt at turning ON). Or, the frequency was off from
±6% for three cycles continuously after 50Hz/60Hz was recognized.
Cause and measures
16:An initial charge is defective.
Error Contents The main circuit condenser charge was not completed in the setting
time.
Detection Methods An alarm process is performed and the gate is blocked (regeneration
operation stop) if there is no difference between VAC and VDC in 60V
or less even if five seconds or more have passed since MC was turned
ON.
Cause Measures
Control power supply (A1, A2) voltage
is low. Check the control power supply voltage.
Adjust the control power supply voltage within the specification value.
Control power supply overload by servo
unit defect Remove the connected servo.
Exchange servo unit.
Power circuit fault Confirm that the control power supply voltage is within the specifica-
tion value.
Exchange the unit or the power circuit module (DC-DC converter).
Combination of unit and PROM is
wrong. Confirm the unit and the PROM number.
Control card fault Exchange the unit (exchange control card)
Cause Measures
Main power supply (R, S, T) open phase,
wavy warp, and momentary power failure Check the power supply ripple.
Check that the power supply is normalized.
Control card fault Unit exchange (control card exchange)