
APPENDIX
B–61404E/08
G. ALARM LIST
670
14) Alarms Displayed on spindle Servo Unit
Alarm
No.
Meaning Description Remedy
“A”
display
Program ROM abnormality
(not installed)
Detects that control program is not started (due to
program ROM not installed, etc.)
Install normal program
ROM
AL01 Motor
overheat
Detects motor speed exceeding specified speed ex-
cessively.
Check load status.
Cool motor then reset
alarm.
AL02 Excessive speed deviation Detects motor speed exceeding specified speed ex-
cessively.
Check load status.
Reset alarm.
AL03 DC link section fuse blown Detects that fuse F4 in DC link section is blown (mod-
els 30S and 40S).
Check power transistors,
and so forth.
Replace fuse.
AL04 Input fuse blown.
Input power open phase.
Detects blown fuse (F1 to F3), open phase or mo-
mentary failure of power (models 30S and 40S).
Replace fuse.
Check open phase and
power supply refenerative
circuit operation.
AL05 Control power supply fuse
blown
Detects that control power supply fuse AF2 or AF3 is
blown (models 30S and 40S).
Check for control power
supply short circuit .
Replace fuse.
AL–07 Excessive speed Detects that motor rotation has exceeded 115% of its
rated speed.
Reset alarm.
AL–08 High input voltage Detects that switch is flipped to 200 VAC when input
voltage is 230 VAC or higher (models 30S and 40S).
Flip switch to 230 VAC.
AL–09 Excessive load on main circuit
section
Detects abnormal temperature rise of power transis-
tor radiator.
Cool radiator then reset
alarm.
AL–10 Low input voltage Detects drop in input power supply voltage. Remove cause, then reset
alarm.
AL–11 Overvoltage in DC link section Detects abnormally high direct current power supply
voltage in power circuit section.
Remove cause, then reset
alarm.
AL–12 Overcurrent in DC link section Detects flow of abnormally large current in direct cur-
rent section of power cirtcuit
Remove cause, then reset
alarm.
AL–13 CPU internal data memory ab-
normality
Detects abnormality in CPU internal data memory.
This check is made only when power is turned on.
Remove cause, then reset
alarm.
AL–15 Spindle switch/output switch
alarm
Detects incorrect switch sequence in spindle switch/
output switch operation.
Check sequence.
AL–16 RAM abnormality Detects abnormality in RAM for external data. This
check is made only when power is turned on.
Remove cause, then reset
alarm.
AL–18 Program ROM sum check er-
ror
Detects program ROM data error.This check is made
only when power is turned on.
Remove cause, then reset
alarm.
AL–19 Excessive U phase current
detection circuit offset
Detects excessive U phase current detection ciucuit
offset.
This check is made only when power is turned on.
Remove cause, then reset
alarm.
AL–20 Excessive V phase current
detection circuit offset
Detects excessive V phase current detection circuit
offset.
This check is made only when power is turned on.
Remove cause, then reset
alarm.