
APPENDIX
B–63084EN/02
G. ALARM LIST
737
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
7n07 SPN_n_ : OVERSPEED 07 Check for a sequence error. (For ex-
ample, check whether spindle syn-
chronization 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 position
control mode, positional deviations
were accumulated excessively (SFR
and SRV were turned off during
spindle synchronization.)
7n09 SPN_n_ : OVERHEAT
MAIN CIRCUIT
09 1 Improve the heat sink cooling sta-
tus.
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 motor
deceleration. If the voltage ex-
ceeds 253 VAC (for the 200–V
system) or 530 VAC (for the 400–V
system), improve the power sup-
ply impedance.
Overvoltage of the DC link section of
the PSM was detected. (PSM alarm
indication: 7)
PSM selection error. (The maximum
output specification of the PSM is ex-
ceeded.)
7n12 SPN_n_ : OVERCUR-
RENT POW
CIRCUIT
12 1 Check the motor insulation status.
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 circuit
component is detected. (RAM for ex-
ternal data is abnormal.)
7n18 SPN_n_ : SUMCHECK
ERROR PGM
DATA
18 Replace the SPM control printed cir-
cuit board.
Abnormality in an SPM control circuit
component is detected. (Program
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 ab-
normal.)
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 ab-
normal.)
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.