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Problems and Countermeasures
Section 8-3
16
Motor is not turn-
ing.
The Servo Driver is not
enabled.
Check the MC Unit to see
whether the Driver is enabled
and the servo loop is active
(WDOG and SERVO parame-
ters).
Check whether the Servo Driver
is operating.
Correct the MC Unit settings.
Correct the Servo Driver
operation.
17
The communication between
the MC Unit and Servo Driver is
malfunctioning.
Check both the MC Unit and
Servo Driver if they indicate a
communication error.
If there is an error, try to find
the cause and cycle power of
system.
18
The FWD or REV limit switch
are set for the Servo Driver or
MC Unit.
Check the limit switch inputs.
Turn OFF the Servo Driver
run prohibit input.
Make the setting so that the
Servo Driver run prohibit
inputs will not be used.
19
The Servo Driver is not in the
correct (speed control) mode
(and is not receiving MC Unit
speed reference).
Check the Servo Driver set-
tings.
Correct the Servo Driver set-
tings.
20
The mechanical axis is locked.
Check whether there is a
mechanical limit or lock in
effect.
Manually release the
mechanical lock.
21
The MC Unit is defective.
---
Replace the MC Unit.
22
Rotation is
reversed.
The Servo Driver is set for
reverse rotation.
Check whether the Servo Driver
is set for reverse rotation by jog-
ging.
Correct the setting for the
direction of Servo Driver rota-
tion.
23
The PP_STEP parameter set-
ting is set for reverse rotation.
Check whether the parameter is
set for reverse rotation (is nega-
tive).
Correct the parameter value.
24
There are
unusual noises.
The machinery is vibrating.
Check for foreign objects in the
machinery’s moving parts, and
inspect for damage, deforma-
tion, and looseness.
Make any necessary repairs.
25
The speed loop gain is insuffi-
cient. (The gain is too high.)
---
Perform autotuning.
Manually adjust (decrease)
the gain.
26
The wrong Servomotor is
selected (so it cannot be
adjusted).
Check the torque and inertia
ratings and select another Ser-
vomotor.
Change to a suitable Servo-
motor.
27
There is eccentricity in the cou-
plings connecting the Servomo-
tor axis and the mechanical
system.
---
Adjust the mounting of the
Servomotor and machinery.
No.
Problem
Probable causes
Items to check
Remedy