
9. TROUBLESHOOTING (SERIAL INTERFACE SPINDLE)
B–62755EN/01
390
Alarm No. Meanings Description Remedy
AL–27
Position coder signal
disconnection
Detects abnormality in position coder signal
(such as unconnected cable and parameter
setting error).
Correct cause, then reset alarm.
AL–28
Disconnection of
position detection signal
for Cs contouring control
Detects abnormality in position detection
signal for Cs contouring control (such as
unconnected cable and adjustment error).
Correct cause, then reset alarm.
AL–29
Short-time overload Detects that overload has been continuous-
ly applied for some period of time (such as
restraining motor shaft in positioning).
Correct cause, then reset alarm.
AL–30 Input circuit overcurrent Detects overcurrent flowing in input circuit. Correct cause, then reset alarm.
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 cur-
rent power supply voltage in power circuit
section when magnetic contactor in amplifi-
er is turned on (such as open phase and
defective charging resistor).
Correct cause, then reset alarm.
AL–34
Parameter data setting
beyond allowable range
of values
Detects parameter data set beyond allow-
able range of values.
Set correct data.
AL–35
Excessive gear ratio data
setting
Detects gear ratio data set beyond allow-
able 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–39
Alarm for indicating fail-
ure in detecting 1-rotation
signal for Cs contouring
control
Detects 1-rotation signal detection failure in
Cs contouring control.
Make signal adjustment.
Check cable shield status.
AL–40
Alarm for indicating
1-rotation signal for Cs
contouring control not
detected
Detects that 1-rotation signal has not
occurred in Cs contouring control.
Make 1-rotation signal adjustment.
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 con-
version 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.