5 Troubleshooting
5
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Er.733: Encoder multi-turn counting error
Cause
Confirming Methods
Corrective Action
The encoder is faulty.
Set H0D-20 = 1 to remove the fault. Er.733 persists after
power-on again.
Replace servo motor.
Er.735: Encoder multi-turn counting overflow
Cause
Confirming Methods
Corrective Action
Encoder multi-turn counting overflow is
detected when H02-01 = 1.
-
Set H0D-20 = 1 and power on the system
again.
Er.740: Encoder interference
Cause
Confirming Methods
Corrective Action
1. Encoder wiring is
incorrect.
Check encoder wiring.
Re-connect the encoder according
to correct wiring diagram.
2. Encoder cable
becomes loose.
Check whether on-site vibration is too large, which
loosens encoder cable and even damages the
encoder.
Re-connect encoder cable
securely.
3. The encoder
Z signal suffers
interference
Check on-site wirings:
Check whether there is large equipment generating
interference around servo system or whether there
are several variable-frequency power devices inside
the cabinet.
Make servo drive in "rdy" status and rotate motor
shaft counterclockwise (CCW) manually and
observer whether H0B-10 (rotation angle/electrical
angle) increases/decreases smoothly. Turning one
circle corresponds to five 0-360° (for Z series motor).
For X series motor, turning one circle corresponds to
four 0-360°.
If H0B-10 changes abnormally during rotation, it
indicates that a fault occurs on encoder.
If there is no alarm during rotation but the system
alarms during servo running, it is extremely possible
that interference exists.
Prefer to use the cable configured
by Inovance as standard.
If non-standard cable is used,
check whether the cable meets
requirements and is STP cable.
Do not bundle motor cables and
encoder cables together. Ensure
servo motor and servo drive are
well grounded.
Check whether plugs at both ends
of encoder are in good contact
and whether any pin retracts.
4. The encoder is
faulty.
Replace a new encoder cable. If the fault no longer
occurs after replacement, it indicates that the original
encoder is damaged
Place motor at the same position, power on the
system several times and observe change of H0B-
10. The electrical angle must be within ±30°
Replace a new encoder cable.
If not, it indicates that the encoder
is damaged. You need to replace
servo motor.
Er.834: AD sampling overvoltage
Cause
Confirming Methods
Corrective Action
1. AI voltage is too
high.
Measure voltage input from AI and
check whether AI sampling voltage
(H0B-21 or H0B-22) is greater than
11.5 V.
Adjust AI input voltage and view AI sampling
voltage until AI sampling voltage does not exceed
11.5 V.
Summary of Contents for IS650P Series
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