
APPENDIX
B. ALARM LIST
B–62755EN/01
460
Spindle alarms of Model 6S to 26S
Alarm
No.
Meaning Description Remedy
“A”
display
Program ROM abnormality
(not installed)
Detects abnormality in ROM. Exchange ROM
AL–01 Motor
overheat
Detects motor speed exceeding specified speed ex-
cessively.
Check load status.
Cool motor then reset
alarm.
AL–02 Excessive speed deviation Detects motor speed exceeding specified speed ex-
cessively.
Check load or other status
on the motor, correct fail-
ure, then reset the alarm.
AL–03
*
+24V fuse is blown. +24V fuse of the control power is blown Check control power if it is
shorted and replace fuses.
AL–04 Blown of input fuse
Lack of phase of input power
supply
One of fuse F1 to F3 is flown or lack of phase or mo-
mentary power failure was detected.
Check lack of phase of
power supply and power
regenerative circuit and re-
place fuse if required.
AL–05 Not used
AL–06 Excessive speed (Analog) Detects that motot rotation has exceeded 115% of its
rated speed.
Remove cause, then reset
alarm.
AL–07 Excessive speed (Digital) Detects that motor rotation has exceeded 115% of its
rated speed.
Remove cause, then reset
alarm.
AL–08 High input voltage Detects that input voltage is 230 VAC or higher . Flip switch to 230 VAC.
AL–09 Overheat of radiator Temperature of radiator used for transistor is ex-
tremely high.
Cool radiator then reset
alarm.
AL–10 Low input voltage Detects drop in +15V power supply or 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 Defectives CPU and
peripherals
Detects abnormal transmission between CPU and
peripherals
Exchange PCB.
AL–14 ROM abnormality Detects abnormality in ROM. Exchange ROM or PCB.
AL–15 Defective optional circuit Detects defective optional circuit (switch sequence
in spindle switch/output switch operation) and erro-
neous connection to optional circuit.
Check sequence ,then
exchange PCB.
AL–16
AL–17
NVRAM abnormality Detects abnormality in NVRAM for external data. Exchange NVRAM or PCB.
AL–18
to
AL–23
Defectives CPU and
peripherals
Detects abnormal transmission between CPU and
peripherals
Exchange PCB.
* Not displayed in PCB version number 10B and later.