3.TROUBLESHOOTING AND ACTION TROUBLESHOOTING B-65285EN/03
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(c) Speed sensor signal error
Check the spindle sensor signal waveform. If an error is
found, make an adjustment or replace the sensor as required.
3.4.8 Alarm Code 15
In output switching control or spindle switching control, the switching
operation sequence was not executed correctly.
This alarm is issued if one second or more elapses from the transition of
a switch request signal (SPSL or RSL) until a power lead state check
signal (MCFN, MFNHG, RCH, or RCHHG) makes a transition.
(1) Troubleshooting when this alarm is issued
(a) The magnetic contactor (switch unit) for power lead
switching is faulty.
If the contact is inoperative, check the power supply of the
magnetic contactor. If the magnetic contactor is still
inoperative, replace the magnetic contactor.
(b) The I/O unit or wiring for checking the contact of the
magnetic contactor is faulty.
If a defect is found in the I/O unit or wiring, replace the I/O
unit or wiring.
(c) The sequence (ladder) is incorrect.
Modify the sequence so that switching is completed within 1
3.4.9 Alarm Code 18
A sum check is abnormal.
If this alarm is issued, replace the SPM or SPM control printed-circuit
3.4.10 Alarm Codes 19 and 20
The offset voltage of the phase U (alarm code 19) or phase V (alarm
code 20) current detection circuit is excessively high. A check is made
when the power is turned on.
If this alarm is issued, replace the SPM. If this alarm is issued
immediately after the SPM control printed circuit board is replaced,
check the plugging of the connectors between the power unit and SPM
control printed circuit board.