Mitsubishi Electric MELSERVO-JN Series - Page 243

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8. TROUBLESHOOTING
Alarm No.: A.99 Name: Stroke limit warning The servo motor stops.
Warning contents Reached to the stroke limit of the moving direction (signal off).
Detailed
display
Detailed
Name
Cause Checking method Result Action
99.1 Forward
rotation
stroke end:
OFF
1) The forward rotation limit
switch became valid.
Check if the forward
rotation stroke end
(LSP) is ON or OFF in
the external I/O signal
display.
The forward rotation
stroke end (LSP) is
OFF.
Reexamine the operation
pattern to turn ON the
forward rotation stroke end
(LSP).
99.2 Reverse
rotation
stroke end:
OFF
2) The reverse rotation limit
switch became valid.
Check if the reverse
rotation stroke end
(LSN) is ON or OFF in
the external I/O signal
display.
The reverse rotation
stroke end (LSN) is
OFF.
Reexamine the operation
pattern to turn ON the
reverse rotation stroke end
(LSN).
Alarm No.: A.E0 Name: Excessive regenerative warning The servo motor does not stop.
Warning contents
There is a possibility that regenerative power may exceed the permissible regenerative power of the built-
in regenerative resistor or the regenerative option.
Detailed
display
Detailed
Name
Cause Checking method Result Action
E0.1 Excessive
regenerative
warning
1) Regenerative power
exceeded 85% of the
permissible regenerative
power of the built-in
regenerative resistor or the
regenerative option.
Call the status display
or MR Configurator and
check the regenerative
load ratio.
85% or more. Reduce the frequency of
positioning.
Increase the deceleration
time constant.
Reduce the load.
Use the regenerative
option, if it is not used.
Alarm No.: A.E1 Name: Overload warning 1 The servo motor does not stop.
Warning contents The overload alarm (50. , 51. ) may occur.
Detailed
display
Detailed
Name
Cause Checking method Result Action
E1.1 The overload
thermal 1
warning
while motor
rotating
1) Load exceeded 85% of the
alarm level of the overload
alarm (50.1).
Execute the checking methods mentioned in the alarm display "50.1".
E1.2 The overload
thermal 2
warning
while motor
rotating
1) Load exceeded 85% of the
alarm level of the overload
alarm (50.2).
Execute the checking methods mentioned in the alarm display "50.2".
E1.3 The overload
thermal 3
warning
while motor
rotating
1) Load increased to 85% or
more against the alarm
level of the overload alarm
(51.1).
Execute the checking methods mentioned in the alarm display "51.1".
E1.5 The overload
thermal 1
warning
while motor
not rotating
1) Load exceeded 85% of the
alarm level of the overload
alarm (50.4).
Execute the checking methods mentioned in the alarm display "50.4".