
B–62075E/04
5. TROUBLESHOOTING
313
· Pulse coder is faulty
Change pulse coder or motor
· Main CPU board is faulty
Change main CPU board
· Sub–CPU board is faulty
Change sub–CPU board
· Additional axis board is faulty
Change additional axis board
· Axis CPU board is faulty
Change axis CPU board
· SIF module is faulty
Change SIF module
(1) (from previous page)
Check whether the motor ratated more than one rota-
tion (one rotation signal is issued ) at faster than 128
pulses of position error amount.
Rotated ?
Return start position is too close
Check that voltage of pulse coder is higher than 4.75 V.
To measure pulse coder voltage, remove the motor cover and measure on
pulse coder PCB at across + and – or +5V and 0V terminals.
More than 4.75V
Hardware failure Pulse coder power voltage is low
YES
NO
NO
YES
· Change the return start position.
· Move the machine at faster that 128
pulses for more than one rotation to
wards RP.
· Caused by wire resistance
check wire material
(resistance shall be 0.5W or
less in both ways to restrict
voltage drop.)
· Pulse coder power supply is
abnormal
Change the power supply .
CAUTION
1 After the pulse coder or motor is exchanged, reference
position or machine’s standard point may be different from
former one. Please set it correctly.
2 When the main board is exchanged, all the data stored in
memory is lost. Reset all the NC data again, referring to the
Chapter 3.
NOTE
A speed more than 128 pulses is required because if speed
is lower that this, one–rotation signal does not function
stably, causing improper position detection.