
APPENDIXA. ALARM LIST
B–63525EN/02
902
No. DescriptionFaulty location and remedy
SPM in-
dica-
tion(*1)
Message
7n24 SPN_n_ : SERIAL
TRANSFER
ERROR
24 1 Place the CNC–to–spindle cable
away from the power cable.
2 Replace the cable.
The CNC power is turned off (normal
power–off or broken cable).
An error is detected in communica-
tion data transferred to the CNC.
7n26 SPN_n_ : DISCONNECT
C–VELO DE-
TECT
26 1 Replace the cable.
2Re–adjust the pre–amplifier.
The signal amplitude of the detection
signal (connector JY2) on the Cs con-
tour control motor side is abnormal.
(Unconnected cable, adjustment er-
ror, etc.)
7n27 SPN_n_ : DISCONNECT
POS–CODER
27 1 Replace the cable.
2Re–adjust the BZ sensor signal.
1 The spindle position coder (con-
nector JY4) signal is abnormal.
2 The signal amplitude (connector
JY2) of the MZ or BZ sensor is ab-
normal.
(Unconnected cable, adjustment
error, etc.)
7n28 SPN_n_ : DISCONNECT
C–POS DE-
TECT
28 1 Replace the cable
2Re–adjust the pre–amplifier.
The position detection signal (con-
nector JY5) for Cs contour control is
abnormal.
(Unconnected cable, adjustment er-
ror, etc.)
7n29 SPN_n_ : SHORTTIME
OVERLOAD
29 Check and correct the load status. Excessive load has been applied
continuously for a certain period of
time. (This alarm is issued also when
the motor shaft has been locked in the
excitation state.)
7n30 SPN_n_ : OVERCUR-
RENT POW
CIRCUIT
30 Check and correct the power supply
voltage.
Overcurrent is detected in PSM main
circuit input. (PSM alarm indication:
1)
Unbalanced power supply.
PSM selection error (The maximum
PSM output specification is exceed-
ed.)
7n31 SPN_n_ : MOTOR LOCK
OR V–SIG LOS
31 1 Check and correct the load status.
2 Replace the motor sensor cable
(JY2 or JY5).
The motor cannot rotate at a specified
speed. (A level not exceeding the
SST level for the rotation command
has existed continuously.)
Abnormality in the speed detection
signal.
7n32 SPN_n_ : RAM FAULT
SERIAL LSI
32 Replace the SPM control printed cir-
cuit board.
Abnormality in an SPM control circuit
component is detected. (The LSI de-
vice for serial transfer is abnormal.)
7n33 SPN_n_ : SHORTAGE
POWER
CHARGE
33 1 Check and correct the power sup-
ply voltage.
2 Replace the PSM unit.
Charging of direct current power sup-
ply voltage in the power circuit section
is insufficient when the magnetic con-
tractor in the amplifier is turned on
(such as open phase and defective
charging resistor).