
APPENDIXG. ALARM LIST
B–63614EN/01
792
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
9n46 SPN_n_ : SCREW
1–ROT POS–
COD. ALARM
46 1 Check and correct the parame-
ter.
2 Replace the cable.
3Re–adjust the BZ sensor signal.
An abnormality equivalent to alarm
41 was detected during thread cut-
ting operation.
9n47 SPN_n_ : POS–CODER
SIGNAL AB-
NORMAL
47 1 Replace the cable.
2Re–adjust the BZ sensor signal.
3 Correct the cable layout (vicinity
of the power line).
1 The A/B phase signal of the
spindle position coder (connector
JY4) is abnormal.
2 The A/B phase signal (connector
JY2) of the MZ or BZ sensor is
abnormal.
The relationship between the A/B
phase and 1–rotation signal is incor-
rect (Pulse interval mismatch).
9n49 SPN_n_ : HIGH CONV.
DIF. SPEED
49 Check whether the calculated differ-
ential speed value exceeds the
maximum motor speed.
In differential speed mode, the
speed of the other spindle con-
verted to the speed of the local
spindle has exceeded the allowable
limit (the differential speed is calcu-
lated by multiplying the speed of the
other spindle by the gear ratio).
9n50 SPN_n_ : SPNDL CON-
TROL OVER-
SPEED
50 Check whether the calculated value
exceeds the maximum motor
speed.
In spindle synchronization, the
speed command calculation value
exceeded the allowable limit (the
motor speed is calculated by multi-
plying the specified spindle speed
by the gear ratio).
9n51 SPN_n_ : LOW VOLT DC
LINK
51 1 Check and correct the power
supply voltage.
2 Replace the MC.
Input voltage drop was detected.
(PSM alarm indication: 4) (Momen-
tary power failure or poor MC con-
tact)
9n52 SPN_n_ : ITP SIGNAL
ABNORMAL I
52 1 Replace the SPM control printed
circuit board.
2 Replace the spindle interface
printed circuit board in the CNC.
NC interface abnormality was de-
tected (the ITP signal stopped).
9n53 SPN_n_ : ITP SIGNAL
ABNORMAL II
53 1 Replace the SPM control printed
circuit board.
2 Replace the spindle interface
printed circuit board in the CNC.
NC interface abnormality was de-
tected (the ITP signal stopped).
9n54 SPN_n_ : OVERLOAD
CURRENT
54 Review the load state. An overload current was detected.
9n55 SPN_n_ : POWER LINE
SWITCH ER-
ROR
55 1 Replace the magnetic contactor.
2 Check and correct the sequence.
The power line state signal of the
magnetic contactor for selecting a
spindle or output is abnormal.
9n56 SPN_n_ : INNER COOL-
ING FAN STOP
56 Replace the SPM unit. The cooling fan in the SPM control
circuit stopped.
9n57 SPN_n_ : EX DECEL-
ERATION
POWER
57 1 Decrease the acceleration/decel-
eration duty.
2 Check the cooling condition (pe-
ripheral temperature).
3 If the cooling fan stops, replace
the resistor.
4 If the resistance is abnormal, re-
place the resistor.
An overload was detected in the re-
generative resistance. (PSMR
alarm indication: 8)
Thermostat operation or short–time
overload was detected.
The regenerative resistor was dis-
connected, or an abnormal resis-
tance was detected.