FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

APPENDIX
G. ALARM LIST
B–62764EN/01
896
Number Message Contents
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.
The details of servo alarm No. 414 are displayed in the diagnosis display
(No. 200 and No.204) as shown below.
#7 #6 #5 #4 #3 #2 #1 #0
OVL
LV
OVC HCA HVA DCA FBA OFA200
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.
FBA : A disconnection alarm is being generated.
(This bit causes servo alarm No.416.The details are indicated
in diagnostic data No. 201)
OFA : An overflow alarm is being generated inside of digital servo.
#7 #6 #5 #4 #3 #2 #1 #0
OFS
MCC LDA PMS204
OFS : A current conversion error has occured in the digital servo.
MCC : A magnetic contactor contact in the servo amplifier has
welded.
LDA : The LED indicates that serial pulse coder C is defective
PMS : A feedback pulse error has occured because the feedback cable
is defective.
D Details of servo
alarm No.414

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