
APPENDIXG. ALARM LIST
B–63844EN/02
840
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
7n07 SPN_n_ : OVERSPEED 07 Check for a sequence error. (For
example, check whether spindle
synchronization was specified when
the spindle could not be turned.)
The motor speed has exceeded
115% of its rated speed.
When the spindle axis was in posi-
tion control mode, positional devi-
ations were accumulated exces-
sively (SFR and SRV were turned
off during spindle synchronization.)
7n09 SPN_n_ : OVERHEAT
MAIN CIRCUIT
09 1 Improve the heat sink cooling
status.
2 If the heat sink cooling fan stops,
replace the SPM unit.
Abnormal temperature rise of the
power transistor radiator
7n11 SPN_n_ : OVERVOLT
POW CIRCUIT
11 1 Check the selected PSM.
2 Check the input power voltage
and change in power during mo-
tor deceleration. If the voltage
exceeds 253 VAC (for the 200–V
system) or 530 VAC (for the
400–V system), improve the
power supply impedance.
Overvoltage of the DC link section
of the PSM was detected. (PSM
alarm indication: 7)
PSM selection error. (The maxi-
mum output specification of the
PSM is exceeded.)
7n12 SPN_n_ : OVERCUR-
RENT POW
CIRCUIT
12 1 Check the motor insulation sta-
tus.
2 Check the spindle parameters.
3 Replace the SPM unit.
The motor output current is abnor-
mally high.
A motor–specific parameter does
not match the motor model.
Poor motor insulation
7n15 SPN_n_ : SP SWITCH
CONTROL
ALARM
15 1 Check and correct the ladder se-
quence.
2 Replace the switching MC.
The switch sequence in spindle
switch/output switch operation is ab-
normal.
The switching MC contact status
check signal and command do not
match.
7n16 SPN_n_ : RAM FAULT 16 Replace the SPM control printed cir-
cuit board.
Abnormality in an SPM control cir-
cuit component is detected. (RAM
for external data is abnormal.)
7n18 SPN_n_ : SUMCHECK
ERROR PGM
DATA
18 Replace the SPM control printed cir-
cuit board.
Abnormality in an SPM control cir-
cuit component is detected. (Pro-
gram ROM data is abnormal.)
7n19 SPN_n_ : EX OFFSET
CURRENT U
19 Replace the SPM unit. Abnormality in an SPM component
is detected. (The initial value for the
U phase current detection circuit is
abnormal.)
7n20 SPN_n_ : EX OFFSET
CURRENT V
20 Replace the SPM unit. Abnormality in an SPM component
is detected. (The initial value of the
V phase current detection circuit is
abnormal.)
7n21 SPN_n_ : POS SENSOR
POLARITY ER-
ROR
21 Check and correct the parameters.
(No. 4000#0, 4001#4)
The polarity parameter setting of the
position sensor is wrong.
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 (nor-
mal power–off or broken cable).
An error is detected in communica-
tion data transferred to the CNC.