Sanyo Denki Sanmotion R 3E S, Instruction Manual, Page: 358 / 514

8. Maintenance
8-25
■
Alarm Code 88 (External Absolute Encoder Communication Error)
 Corrective actions
■
Alarm Code 89 (External Encoder Initial Process Error)
 Corrective actions
Status at the time of alarm
Cause
1 2 3 4
Issued when control power is turned ON.
✔ ✔ ✔
Issued during operation. ✔ ✔
Cause Investigation and corrective actions
1
■
Defect in internal circuit of external
encoder.
■
Replace the external encoder.
2
■
Malfunction due to noise.
■
Confirm proper grounding of the
amplifier.
■
Check the shielding of the encoder
cable.
■
Add ferrite core or similar
countermeasures to against noise.
3
■
External encoder wiring has
abnormalities.
■
Check the wiring conditions and
correct it if improper.
4
■
External encoder power supply
voltage reduction.
■
Confirm that the external encoder
power supply voltage is above 4.75
V, and correct it if improper.
Status at the time of alarm
Cause
1 2 3 4
Issued during operation. ✔ ✔ ✔ ✔
Cause Investigation and corrective actions
1
■
For external encoder wiring:
 Improper wiring.
 Connector is removed.
 Loose connection.
 Encoder cable is too long.
 Encoder cable is too thin.
■
Check the wiring conditions and
correct it if improper.
■
Confirm that the encoder power
supply voltage at the motor side is
above 4.75 V, and correct it if
improper.
2
■
Turn-on timing of external encoder
power is delayed.
■
Confirm that the power supply
voltage for the external encoder
soon after turning on control power,
and bring forward the timing of
turning on the power for external
encoder if it is not established.
3
■
Defect in internal circuit of servo
amplifier.
■
Replace the servo amplifier.
4
■
Defect in internal circuit of external
encoder.
■
Replace the external encoder.