
APPENDIXG. ALARM LIST
B–64124EN/01
868
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
7n36 SPN_n_ : OVERFLOW
ERROR
COUNTER
36 Check whether the position gain val-
ue is too large, and correct the value.
An error counter overflow occurred.
7n37 SPN_n_ : SPEED DE-
TECT PAR.
ERROR
37 Correct the value according to the pa-
rameter manual.
The setting of the parameter for the
number of pulses in the speed detec-
tor is incorrect.
7n41 SPN_n_ : 1–ROT POS–
CODER ER-
ROR
41 1 Check and correct the parameter.
2 Replace the cable.
1 The 1–rotation signal of the
spindle position coder (connector
JYA3) is abnormal.
2 Parameter setting error
7n42 SPN_n_ : NO 1–ROT.
POS–CODER
DETECT
42 Replace the cable. The 1–rotation signal of the spindle
position coder (connector JYA3) is
disconnected.
7n43 SPN_n_ : DISCON. PC
FOR DIF. SP.
MODE
43 Replace the cable. The differential speed position coder
signal is abnormal.
7n46 SPN_n_ : SCREW
1–ROT POS–
COD. ALARM
46 1 Check and correct the parameter.
2 Replace the cable.
3 Re–adjust the BZi sensor signal.
An abnormality equivalent to alarm
41 was detected during thread cut-
ting operation.
7n47 SPN_n_ : POS–CODER
SIGNAL AB-
NORMAL
47 1 Replace the cable.
2 Correct the cable layout (vicinity of
the power line).
1 The A/B phase signal of the
spindle position coder (connector
JYA3) is abnormal.
2 The relationship between the A/B
phase and 1–rotation signal is in-
correct (Pulse interval mismatch).
7n49 SPN_n_ : HIGH CONV.
DIF. SPEED
49 Check whether the calculated differ-
ential speed value exceeds the maxi-
mum motor speed.
In differential speed mode, the speed
of the other spindle converted to the
speed of the local spindle has ex-
ceeded the allowable limit (the differ-
ential speed is calculated by multiply-
ing the speed of the other spindle by
the gear ratio).
7n50 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 exceed-
ed the allowable limit (the motor
speed is calculated by multiplying the
specified spindle speed by the gear
ratio).
7n51 SPN_n_ : LOW VOLT DC
LINK
51 1 Check and correct the power sup-
ply voltage.
2 Replace the MC.
Input voltage drop was detected.
(PSM alarm indication: 4) (Momen-
tary power failure or poor MC contact)
7n52 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).
7n53 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).