
APPENDIXG. ALARM LIST
B–63514EN/01
712
SPM
indica-
tion(*1)
DescriptionFaulty location and remedy
50 Check whether the calculated value exceeds the maxi-
mum motor speed.
In spindle synchronization, the speed command cal-
culation value exceeded the allowable limit (the motor
speed is calculated by multiplying the specified spindle
speed by the gear ratio).
51 1 Check and correct the power supply voltage.
2 Replace the MC.
Input voltage drop was detected. (PSM alarm indication:
4) (Momentary power failure or poor MC contact)
52 1 Replace the SPM control printed circuit board.
2 Replace the spindle interface printed circuit board in
the CNC.
NC interface abnormality was detected (the ITP signal
stopped).
53 1 Replace the SPM control printed circuit board.
2 Replace the spindle interface printed circuit board in
the CNC.
NC interface abnormality was detected (the ITP signal
stopped).
56 Replace the SPM unit. The cooling fan in the SPM control circuit stopped.
57 1 Decrease the acceleration/deceleration duty.
2 Check the cooling condition (peripheral tempera-
ture).
3 If the cooling fan stops, replace the resistor.
4 If the resistance is abnormal, replace the resistor.
An overload was detected in the regenerative resis-
tance. (PSMR alarm indication: 8)
Thermostat operation or short–time overload was de-
tected.
The regenerative resistor was disconnected, or an ab-
normal resistance was detected.
58 1 Check the PSM cooling status.
2 Replace the PSM unit.
The temperature of the radiator of the PSM has in-
creased abnormally. (PSM alarm indication: 3)
59 Replace the SPM unit. The cooling fan in the PSM stopped. (PSM alarm indica-
tion: 2)