Inovance SV670N Series - Page 77

Description of Fault Codes
‑76‑
Cause
Confirming Method
Solution
1. The encoder
is wired
incorrectly.
2. The encoder
cable is
loosened.
1. Check the wiring of the encoder.
2. Check whether vibration on site is
too strong, which loosens the
encoder cable and even damages
the encoder.
3. Replace with a new encoder
cable. If the fault no longer
occurs after cable replacement, it
indicates the original encoder
cable is damaged.
1. Connect the cables again
according to the correct wiring
diagram. Connect the cables
again and ensure encoder
terminals are connected securely.
Preferably use cables provided by
Inovance. If a customized
encoder cable is used, check
whether this cable is a shielded
twisted pair cable complying with
the specifications. Route the
motor cables and encoder cables
through different routes. Ensure
the servo motor and servo drive
are grounded properly.
2. Check whether the connectors at
both ends of the encoder are in
good contact and whether any
pin retracts.
3. Replace with a new encoder
cable. If the fault persists after
the encoder cable is replaced, the
encoder may be faulty. In this
case, replace the servo motor.
3. The encoder Z
signal is
interfered with.
1. Check whether ambient devices
are generating interference and
whether multiple interference
sources are present in the
cabinet.
2. Make servo drive stay in "Rdy"
status and rotate motor shaft
counterclockwise (CCW) manually
and observer whether H0b.17
(Eelectrical angle) increases/
decreases smoothly. Turning one
circle corresponds to five 0–360°
(for Z series motors). For X series
motors, turning one circle
corresponds to four 0–360°. If
H0b.17 changes abnormally
during motor rotating, the
encoder is faulty. If no warning is
reported during rotation but the
servo drive reports a warning
during operation, disturbance
may be present.
4. The encoder
is faulty.
Keep the motor in a certain
position, power on the system
several times and observe the
change of H0b.17 (Electrical angle).
The electrical angle deviation
should be within ±30° when the
motor position does not change.
● E939.0: Motor power cable disconnected