
APPENDIX
B–63844EN/02
G. ALARM LIST
843
No. DescriptionFaulty location and remedy
SPM
indica-
tion(*1)
Message
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
exceeded the allowable limit (the
motor speed is calculated by multi-
plying the specified spindle speed
by the gear ratio).
7n51 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)
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).
7n54 SPN_n_ : OVERLOAD
CURRENT
54 Review the load state. An overload current was detected.
7n55 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.
7n56 SPN_n_ : INNER COOL-
ING FAN STOP
56 Replace the SPM unit. The cooling fan in the SPM control
circuit stopped.
7n57 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.
7n58 SPN_n_ : OVERLOAD IN
PSM
58 1 Check the PSM cooling status.
2 Replace the PSM unit.
The temperature of the radiator of
the PSM has increased abnormally.
(PSM alarm indication: 3)
7n59 SPN_n_ : COOLING FAN
STOP IN PSM
59 Replace the SPM unit. The cooling fan in the PSM
stopped. (PSM alarm indication: 2)
7n62 SPN_n_ : MOTOR VCMD
OVER-
FLOWED
62 Check and correct the parameters.
(No. 4021, 4056 to 4059)
The specified motor speed is too
large.
7n66 SPN_n_ : AMP MODULE
COMMUNICA-
TION
66 1 Replace the cable.
2 Check and correct the connec-
tion.
An error was found in communica-
tion between amplifiers.
7n73 SPN_n_ : MOTOR SEN-
SOR DISCON-
NECTED
73 1 Replace the feedback cable.
2 Check the shield processing.
3 Check and correct the connec-
tion.
4 Adjust the sensor.
The motor sensor feedback signal
is not present.
7n74 SPN_n_ : CPU TEST ER-
ROR
74 Replace the SPM control printed–
circuit board.
An error was detected in a CPU
test.
7n75 SPN_n_ : CRC ERROR 75 Replace the SPM control printed–
circuit board.
An error was detected in a CRC
test.