YASKAWA E-V Series User Manual page 216

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.520:
Vibration Alarm
A.521:
Autotuning Alarm
(Vibration was detected
while performing tun-
ing-less function.)
A.550:
Maximum Speed
Setting Error
A.710:
A.720:
Overload
A.710: High Load
A.720: Low Load
A.730:
A.731:
Dynamic Brake
Overload
(Detected with SGDV-
3R8A,
-5R5A, -7R6A, -120A,
-180A, -200A, 330A,
- D
SERVOPACKs.)
A.740:
Overload of Surge
Current Limit Resistor
(The main circuit power
is turned ON/OFF too
frequently.)
8-12
Cause
Abnormal vibration was detected
at the servomotor speed.
The mass ratio (Pn103) value is
greater than the actual value or is
greatly changed.
The servomotor vibrated consid-
erably while performing tuning-
less function (factory setting).
The servomotor vibrated consid-
erably during advanced autotun-
ing.
The Pn385 setting is greater than
the maximum speed.
Incorrect wiring or contact fault
of servomotor and encoder.
Operation beyond the overload
protection characteristics.
Excessive load was applied dur-
ing operation because the servo-
motor was not driven due to
mechanical problems.
The setting of the linear scale
pitch (Pn282) is incorrect.
The setting of the motor phase
selection (Pn080.1) is incorrect.
A SERVOPACK fault occurred.
The servomotor moves because
of external force.
The moving energy at a DB stop
exceeds the DB resistance capac-
ity.
A SERVOPACK fault occurred.
The inrush current limit resistor
operation frequency at the main
circuit power supply ON/OFF
operation exceeds the allowable
range.
A SERVOPACK fault occurred.
Investigative Actions
Check for abnormal noise from the
servomotor, and check the speed
and force waveform during opera-
tion.
Check the mass.
Check the servomotor speed wave-
form.
Check the servomotor speed wave-
form.
Check the value of Pn385 and
Un101(Maximum motor speed
which is determined by encoder
output pulses or by motor itself).
Check the wiring.
Check the servomotor overload
characteristics and executed run
command.
Check the executed run command
and servomotor speed.
Check the setting of Pn282.
Check the setting of Pn080.1.
−
Check the operation status.
Check the DB resistor power con-
sumption monitor (Un00B) to see
how many times the DB has been
used.
−
Check how often the power supply
has been turned ON/OFF.
−
Corrective Actions
Reduce the servomotor speed or
reduce the speed loop gain (Pn100).
Set the mass ratio (Pn103) to an
appropriate value.
Reduce the load so that the mass
ratio falls within the allowable
value, or reduce the load level or the
gain level using the tuning-less
function (Fn200).
Execute advanced autotuning.
Set Pn385 to a value equal to or
lower than the motor maximum
speed.
Confirm that the servomotor and
encoder are correctly wired.
Reconsider the load conditions and
operation conditions. Or, increase
the servomotor capacity.
Remove the mechanical problems.
Correct the setting of Pn282.
Correct the setting of Pn080.1.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PACK.
Take measures to ensure the servo-
motor will not move because of
external force.
• Reduce the servomotor reference
speed.
• Reduce the mass.
• Reduce the number of times of
the DB stop operation.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PACK.
Reduce the frequency of turning the
main circuit power supply ON/OFF
to less than once per minute.
The SERVOPACK may be faulty.
Repair or replace the SERVO-
PACK.