Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 172

8. TROUBLESHOOTING
Warning No. E7
Warning description
Display Name
E7.1 Controller forced
stop warning
Warning No. E8
Warning description
Display Name
E8.1 Decreased
cooling fan speed
warning
Warning No. E9
Warning description
Display Name
E9.1 Ready-on signal
on at main circuit
off
E9.2 Bus voltage drop
during low speed
operation
E9.3 Servo-on signal
on at main circuit
off
Name: Controller forced stop warning
Forced stop signal is input from the servo system controller.
Cause
(1) Forced stop signal was
input from the servo
system controller.
Name: Cooling fan speed reduction warning
The speed of cooling fan drops to or below the warning level.
Cause
(1) Foreign matter is caught
in the fan causing
decreased speed.
(2) Cooling fan life expiration. Check the cumulative
Name: Main circuit off warning
Servo-on command is input when the main circuit power is off.
Bus voltage drops when servo motor is running below 50r/min.
Cause
(1) Main circuit power is off.
(2) Connector for the main
circuit power is
disconnected.
(3) Bus voltage is below
215VDC.
(1) Bus voltage drops when
motor is running below
50[r/min].
(1) Main circuit power is off.
(2) Connector for the main
circuit power is
disconnected.
(3) Bus voltage is below
215VDC.
Checkpoint
Check if the servo system
controller is in forced stop
status.
Checkpoint
Check for foreign matter
adhesion.
power supply time of the
servo amplifier.
Checkpoint
Check the main circuit
power input.
Check the connector of
the main circuit power.
Check the bus voltage
value with MR
Configurator.
Check the bus voltage
value at the monitor.
Examine checkpoints described in the alarm display "E9.1".
8 - 33
Stop method: All axes stop
Finding
In forced stop status. Ensure safety and
deactivate forced stop
signal of the controller.
Stop method: Axes can operate (warning
detected at both axes)
Finding
Adhered. Remove the foreign
matter.
Not adhered. Check (2).
Life is expired. Replace the servo
amplifier, or repair
(replace) the cooling
fan.
Stop method: All axes stop (warning detected
at both axes).
Finding
Not input. Turn on the main
circuit power.
Input. Check (2).
Disconnected. Connect properly.
No problem found. Check (3).
Below 215VDC. Review the wiring.
Review the power
supply capacity.
Below 200VDC. Review the power
supply capacity.
Set acceleration time
longer.
Action
Action
Action