
APPENDIX
B–64114EN/01
G. ALARM LIST
795
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
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 amplifier output current is abnor-
mally high.
A motor–specific parameter does not
match the motor model.
Poor motor insulation
7n13 13 Replace the SPM control printed cir-
cuit board.
An abnormality was detected in the
SPM control circuit.
(SPM internal RAM request)
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.
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.)
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 (normal
power–off or broken cable).
An error is detected in communica-
tion data transferred to the CNC.
7n27 SPN_n_ : DISCONNECT
POS–CODER
27 Replace the cable. The spindle position coder (connec-
tor JYA3) signal is abnormal.
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 31 Check and correct the load status. The motor cannot rotate at a speci-
fied speed. (A level not exceeding
the SST level for the rotation com-
mand has existed continuously.)