Description of Fault Codes
‑59‑
Cause
Confirming Method
Solution
Incorrect UVW is detected
during angle auto‑tuning.
Check whether U/V/W
phases are wired correctly.
Exchange cables of any two
phases among U/V/W and
perform auto‑tuning again.
● E605.0: Bootstrap overspeed
Cause:
The motor speed exceeds the rated speed when the servo drive in size A/B is
switched on.
Cause
Confirming Method
Solution
The motor speed exceeds
the motor rated speed when
the servo drive is switched
on.
Check if the drive is enabled
when the motor has been
driven.
Switch on the drive when
the motor is standstill.
● E620.0: Motor overload
Cause:
The accumulative heat of the motor reaches the fault threshold.
Cause
Confirming Method
Solution
1. The motor and encoder
cables are connected
improperly or in poor
contact.
Check the wiring between
the servo drive, servo motor
and the encoder according
to the correct “wiring
diagram”.
Connect cables according to
the correct wiring diagram.
It is recommended to use
the cables provided by
Inovance.
When customized cables are
used, prepare and connect
the customized cables
according to the wiring
instructions.
2. The load is so heavy that
the effective torque
outputted by the motor
keeps exceeding the rated
torque.
Check the overload
characteristics of the servo
drive or servo motor.
Check whether the average
load rate (H0b.12) of the
servo drive keeps exceeding
100.0%.
Use a servo drive of higher
capacity and a matching
servo motor, or reduce the
load and increase the
acceleration/deceleration
time.
3. Acceleration/deceleration
is too frequent or the load
inertia is too large.
Calculate the mechanical
inertia ratio or perform
inertia auto‑tuning. Check
the value of H08.00 (Load
inertia ratio).
Confirm the individual
operation cycle when the
servo motor operates
cyclically.
Increase the acceleration/
deceleration time in an
individual operation cycle.
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