6-20
Possible Causes What to Check and Suggested Measures
(7) The motor speed does not rise
due to the torque limiter
operation.
Check the data of F40 (Torque limiter 1-1).
Î Correct the F40 data. Or, set the F40 data to "999" (Disable) if the torque limiter
operation is not needed.
[ 29 ]
nrb
NTC wire break error
Problem A wire break is found in the NTC thermistor detection circuit.
Possible Causes What to Check and Suggested Measures
(1) The NTC thermistor cable is
broken.
Check whether the motor cable is broken.
Î Replace the motor cable.
(2) The temperature around the
motor is extremely low (lower
than -30°C).
Measure the temperature around the motor.
Î Reconsider the use environment of the motor.
(3) The NTC thermistor is broken. Measure the resistance of the NTC thermistor.
Î Replace the motor.
[ 30 ]
err
Mock alarm
Problem The LED displays the alarm
err
.
Possible Causes What to Check and Suggested Measures
(1) The + keys were held
down for more than 5 seconds.
Î To escape from this alarm state, press the key.
[ 31 ]
cof
PID feedback wire break
Problem The PID feedback wire is broken.
Possible Causes What to Check and Suggested Measures
(1) The PID feedback signal wire
is broken.
Check whether the PID feedback signal wires are connected correctly.
Î Check whether the PID feedback signal wires are connected correctly. Or,
tighten up the related terminal screws.
Î Check whether any contact part bites the wire sheath.
(2) PID feedback related circuit
affected by strong electrical
noise.
Check if appropriate noise control measures have been implemented (e.g., correct
grounding and routing of signal wires, communication cables, and main circuit
wires).
Î Implement noise control measures.
Î Separate the signal wires from the main power wires as far as possible.
[ 32 ]
dba
Braking transistor error
Problem A braking transistor error is detected.
Possible Causes What to Check and Suggested Measures
(1) The braking transistor is
broken.
Check whether resistance of the braking resistor is correct or there is a
misconnection of the resistor.
Î Consult your Fuji Electric representative for repair.
[ 33 ]
ero
Positioning control error
Problem An excessive positioning deviation has occurred when the servo-lock function was activated.
Possible Causes What to Check and Suggested Measures
(1) Insufficient gain in positioning
control system
Readjust the settings of J97 (Servo-lock (Gain)) and d03 (Speed control 1 P (Gain)).
(2) Incorrect control completion
width
Check whether the setting of J99 (Servo-lock (Completion width)) is correct.
Î Correct the setting of J99.
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