
B–62835EN/01
9. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)
337
Item Cause of trouble Check procedure Remedy
1
Defective fan motor
of motor
Check if fan motor is
rotating.
Replace fan motor.
2
Overload operation Check cutting conditions
and how tools are worn.
Check load meter for
cutting.
Review cutting conditions
and tools.
3
Dirty motor cooling
system
Check motor cooling sys-
tem for dirt.
Clean motor cooling
system with an air gun or
vacuum cleaner.
4
Disconnection or
loose contact of
motor overheat
signal line
Check signal line connec-
tion status.
Connect signal line
correctly.
Item Cause of trouble Check procedure Remedy
1
Overload operation
(overload)
Check with load meter. Review cutting conditions
and tools.
2
Defective transistor
module
Check if transistor collec-
tor-emitter is open.
Replace transistor module.
3
Fuse for protecting
driver on PCB
blown or not in-
serted correctly
(disconnection,
loose contact, etc.)
Check if fuses F3A to F3M
(models 1S to 26S) or FA
to FG (models 30S and
40S) are blown or re-
moved.
Insert fuses firmly.
Replace any blown fuse.
4
Speed feedback
signal abnormality
Check level of speed feed-
back signal.
Check motor speed detec-
tor and signal cable con-
nection.
5
Wiring failure
(disconnection,
loose contact, etc.)
Check that cables are
connected correctly.
NOTE
How to check the speed feedback signal
Observe the speed feedback signal with an osciloscope
after turning on power and setting the rotation command off
(motor stopped and drive power set off).
Observe the test points indicated below, while turning the
motor slowly by hand.
9.2
TROUBLESHOOTING
FOR EACH ALARM
AL–01 Motor overheat
AL–02 Excessive speed
deviation