APPENDIX
B–63834EN/02
G. ALARM LIST
757
Number ContentsMessage
417 SERVO ALARM: n–TH AXIS –
PARAMETER INCORRECT
This alarm occurs when the n–th axis (axis 1–4) is in one of the condi-
tions listed below. (Digital servo system alarm)
1) The value set in Parameter No. 2020 (motor form) is out of the speci-
fied limit.
2) A proper value (111 or –111) is not set in parameter No.2022 (motor
revolution direction).
3) Illegal data (a value below 0, etc.) was set in parameter No. 2023
(number of speed feedback pulses per motor revolution).
4) Illegal data (a value below 0, etc.) was set in parameter No. 2024
(number of position feedback pulses per motor revolution).
5) Parameters No. 2084 and No. 2085 (flexible field gear rate) have not
been set.
6) A value outside the limit of {1 to the number of control axes} or a non–
continuous value (Parameter 1023 (servo axis number) contains a
value out of the range from 1 to the number of axes, or an isolated
value (for example, 4 not prceded by 3).was set in parameter No.
1023 (servo axisnumber).
421 SERVO ALARM: n AXIS EXCESS
ER (D)
The difference between the errors in the semi–closed loop and closed
loop has become excessive during dual position feedback. Check the
values of the dual position conversion coefficients in parameters No.
2078 and 2079.
422 SERVO ALARM: n AXIS In torque control of PMC axis control, a specified allowable speed has
been exceeded.
423 SERVO ALARM: n AXIS In torque control of PMC axis control, the parameter–set allowable cu-
mulative travel distance has been exceeded.
430 n AXIS : SV. MOTOR OVERHEAT A servo motor overheat occurred.
431 n AXIS : CNV. OVERLOAD 1) PSM: Overheat occurred.
2) β series SVU: Overheat occurred.
432 n AXIS : CNV. LOW VOLT
CONTROL
1) PSMR: The control power supply voltage has dropped.
2) α series SVU: The control power supply voltage has dropped.
433 n AXIS : CNV. LOW VOLT DC LINK 1) PSM: The DC link voltage has dropped.
2) PSMR: The DC link voltage has dropped.
3) α series SVU: The DC link voltage has dropped.
4) β series SVU: The DC link voltage has dropped.
434 n AXIS : INV. LOW VOLT CONTROL SVM: The control power supply voltage has dropped.
435 n AXIS : INV. LOW VOLT DC LINK SVM: The DC link voltage has dropped.
436 n AXIS : SOFTTHERMAL (OVC) The digital servo software detected the soft thermal state (OVC).
437 n AXIS : CNV. OVERCURRENT
POWER
PSM: Overcurrent flowed into the input circuit.
438 n AXIS : INV. ABNORMAL
CURRENT
1) SVM: The motor current is too high.
2) α series SVU: The motor current is too high.
3) β series SVU: The motor current is too high.
439 n AXIS : CNV. OVER VOLT DC LINK 1) PSM: The DC link voltage is too high.
2) PSMR: The DC link voltage is too high.
3) α series SVU: The C link voltage is too high.
4) β series SVU: The link voltage is too high.
440 n AXIS : CNV. EX DECELERATION
POW.
1) PSMR: The regenerative discharge amount is too large.
2) α series SVU: The regenerative discharge amount is too large. Al-
ternatively, the regenerative discharge circuit is abnormal.