
APPENDIXG. ALARM LIST
B–63504EN/01
672
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
conditions 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).
420 SYNC TORQUE’ : EXCESS ERROR When simple synchronous control is applied, the torque command dif-
ference between the master and slave axes exceeded the value set in
parameter No. 2031.
421 EXCESS ER(D)’ : EXCESS ERROR While the dual position feedback function is being applied, an excessive
difference was detected between a semi–closed loop error and closed
loop error. Check the dual position conversion factor set in parameter
Nos. 2078 and 2079.
422 EXCESS ER(D)’ : SPEED ERROR The specified allowable speed has been exceeded while torque control
for PMC axis control is applied.
423 EXCESS ER(D)’ : EXCESS ERROR The allowable total amount of travel, set in a parameter, has been ex-
ceeded while torque control for PMC axis control is applied.
448 n AXIS : UNMATCHED FEEDBACK
ALARM
The sign of feedback data from the built–in pulse coder differs from
that of feedback data from the separate detector.
449 n AXIS : INV. IPM ALARM 1) SVM: IPM (intelligent power module) detected an alarm.
2) α series SVU: IPM (intelligent power module) detected an alarm.
The details of servo alarm No. 414 are displayed in the diagnosis display
(No. 200 and No.204) as shown below.
#7
OVL200
#6
LV
#5
OVC
#4
HCA
#3
HVA
#2
DCA
#1
FBA
#0
OFA
OVL : An overload alarm is being generated.
(This bit causes servo alarm No. 400. The details are indicated in
diagnostic data No.201).
LV : A low voltage alarm is being generated in servo amp.
Check LED.
OVC : A overcurrent alarm is being generated inside of digital servo.
HCA : An abnormal current alarm is being generated in servo amp.
Check LED.
HVA : An overvoltage alarm is being generated in servo amp.
Check LED.
DCA : A regenerative discharge circuit alarm is being generated in servo amp.
Check LED.
D Details of servo
alarm No.414