
9. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)
B–62835EN/01
336
Alarm No. RemedyDescriptionMeanings
AL–31
Speed detection signal
disconnection motor
restraint alarm
Detects that motor cannot rotate at specified
speed (but rotates at very slow speed or has
stopped). (This includes checking of speed
detection signal cable.)
Correct cause, then reset alarm.
AL–32
Abnormality in RAM
internal to LSI for serial
data transfer
Detects abnormality in RAM internal to LSI for
serial data transfer. This check is made only
when power is turned on.
Correct cause, then reset alarm.
AL–33
Insufficient DC link
section charging
Detects insufficient charging of direct current
power supply voltage in power circuit section
when magnetic contactor in amplifier is turned
on (such as open phase and defective charg-
ing resistor).
Correct cause, then reset alarm.
AL–34
Parameter data setting
beyond allowable range
of values
Detects parameter data set beyond allowable
range of values.
Set correct data.
AL–35
Excessive gear ratio data
setting
Detects gear ratio data set beyond allowable
range of values.
Set correct data.
AL–36 Error counter over flow Detects error counter overflow. Correct cause, then reset alarm.
AL–37
Speed detector parame-
ter setting error
Detects incorrect setting of parameter for
number of speed detection pulses.
Set correct data.
AL–41
Alarm for indicating fail-
ure in detecting position
coder 1-rotation signal.
Detects failure in detecting position coder
1-rotation signal.
Make signal adjustment for signal conversion
circuit.
Check cable shield status.
AL–42
Alarm for indicating posi-
tion coder 1-rotation sig-
nal not detected
Detects that position coder 1-rotation signal
has not occurred.
Make 1-rotation signal adjustment for signal
conversion circuit.
AL–43
Alarm for indicating
disconnection of position
coder signal for
differential speed mode
Detects that main spindle position coder
signal used for differential speed mode is not
connected yet (or is disconnected).
Check that main spindle position coder signal
is connected to connector CN12.
AL–46
Alarm for indicating fail-
ure in detecting
position coder 1-rotation
signal in thread cutting
operation.
Detects failure in detecting position coder
1-rotation signal in thread cutting
operation.
Make 1-rotation signal adjustment for signal
conversion circuit.
Check cable shield status.
AL–47
Position coder signal
abnormality
Detects incorrect position coder signal count
operation.
Make signal adjustment for signal conversion
circuit.
Check cable shield status.
AL–48
Position coder 1-rotation
signal abnormality
Detects that occurrence of position coder
1-rotation signal has stopped.
Make 1-rotation signal adjustment for signal
conversion circuit.
AL–49
The converted differential
speed is too high.
Detects that difference between a spindle
speed and another spindle speed has
exceeded allowable limit in differential speed
mode.
Calculate differential speed by multiplying
speed of other spindle by gear ratio. Check if
calculated value is not greater than maximum
speed of motor.
AL–50
Excessive speed
command calculation
value in spindle
synchronization control
Detects that speed command calculation val-
ue exceeded allowable range in spindle syn-
chronization control.
Calculate motor speed by multiplying specified
spindle speed by gear ratio. Check if calcu-
lated value is not greater than maximum
speed of motor.
AL–51
Undervoltage at DC link
section
Detects that DC power supply voltage of pow-
er circuit has dropped (due to momentary
power failure or loose contact of magnetic
contactor).
Correct cause, then reset alarm.
AL–52
ITP signal abnormality I Detects abnormality in synchronization signal
(ITP signal) with CNC (such as loss of ITP
signal).
Correct cause, then reset alarm.
AL–53
ITP signal abnormality II Detects abnormality in synchronization signal
(ITP signal) with CNC (such as loss of ITP
signal).
Correct cause, then reset alarm.
AL–54
Overload current alarm Detects that excessive current flowed in motor
for long time.
Check if overload operation or frequent
acceleration/deceleration is performed.
AL–55
Power line abnormality in
spindle switching/output
switching
Detects that switch request signal does not
match power line status check signal.
Check operation of magnetic contractor for
power line switching.
Check if power line status check signal is
processed normally.