
B–63445EN/01
7. TROUBLESHOOTING
157
(1)
Check whether the motor ratated more than one rotation
(one rotation signal is issued ) at faster than 128 pulses
of position error amount.
Rotated ?
Return start position is too close
· Chagne the return start position.
· Move the machine at faster that 128
pulses for more than one rotation to
wards RP.
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 is faulty
Change pulse coder or motor
· Base printed board is faulty
Pulse coder power voltage is low
· 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 PCB.
YES
NO
NO
YES
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 base printed board is exchanged, all the data
stored in memory is lost. Reset all the data again, referring
to the data input/output item.
The data includes reference position information.
Reference position setting must also be performed,
therefore.
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.
D Reference