APPENDIX
B–63505EN/02
A. ALARM LIST
313
Number ContentsMessage
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.
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.
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.
ALD201 EXP
#7 #6 #5 #4 #3 #2 #1 #0
When OVL equal 1 in diagnostic data No.200
(servo alarm No. 400 is being generated):
ALD 0 : Motor overheating
1 : Amplifier overheating
When FBAL equal 1 in diagnostic data No.200
(servo alarm No. 416 is being generated):
ALD EXP Alarm details
1 0 Built–in pulse coder disconnection (hardware)
1 1 Separately installed pulse coder disconnection
(hardware)
0 0 Pulse coder is not connected due to software.
D Details of servo
alarm No.414