4-18
Alarm
display
Countermeasures
Probable cause
Condition when error oc-
curred
Error content
a
.
31
Deviation count-
er overflow
Occurred when Servomotor
did not operate even when
command pulse train was
i
t
Servomotor power lines or
encoder lines are wired in-
correctly.
Correct the wiring.
input.
The Servomotor is mechani-
cally locked.
Unlock the Servomotor
shaft.
Occurred at high-speed op-
eration.
Servomotor power lines or
encoder lines are wired in-
correctly.
Correct the wiring.
Occurred when a long com-
mand pulse was given.
The gain adjustment is
insufficient.
Adjust the gain.
g
The acceleration/decelera-
tion times are too extreme.
Lengthen the
acceleration/deceleration
time.
The load is too large.
•
Lighten the load.
•
Select another Servomo-
tor.
Cn-1E (deviation counter
overtravel) is too small.
Increase Cn-1E.
a
.
40
Overvoltage
Occurred when power was
turned on.
The power supply voltage is
outside of the allowable
range.
•
The supply voltage must
be 170 to 253 VAC when
200 VAC is specified.
•
The supply voltage must
be 85 to 127 VAC when
100 VAC is specified.
Occurred during Servomo-
tor deceleration.
The load inertia is too large.
•
Lengthen the deceleration
time.
•
Reset the motor.
The power supply voltage is
outside of the allowable
range.
•
The supply voltage must
be 170 to 253 VAC when
200 VAC is specified.
•
The supply voltage must
be 85 to 127 VAC when
100 VAC is specified.
Regeneration Unit error
Replace the Regeneration
Unit
Occurred while lowering
(vertical shaft)
Gravity torque is too large.
•
Add a counterbalance to
the machine, and reduce
the gravity torque.
•
Reduce the lowering
speed.
•
Connect a Regeneration
Unit.
a
.
51
Over speed
High-speed rotation oc-
curred when command was
input.
The rotational speed ex-
ceeded 4,950 r/min due to
overshooting.
•
Adjust the gain.
•
Lower the maximum
speed of the command.
Encoder is wired incorrectly.
Correct the wiring.
a
.
52
Excessive
speed com-
mand input
(H/L Models)
High-speed rotation oc-
curred when command was
input.
A speed command exceed-
ing 4,700 r/min was input.
•
Lower the command pulse
frequency.
•
Reduce the electronic
gear ratio or increase the
command pulses.
Application
Chapter 4
