Mitsubishi Electric MELSERVO-J4 Instruction Manual Trouble Shooting page 67

1. TROUBLESHOOTING
Alarm No.: E6 Name: Servo forced stop warning
Alarm content
Detail
Detail name
No.
E6.1 Forced stop (1) EM2/EM1 (Forced stop)
warning
(2)
(3) The servo amplifier is
Alarm No.: E7 Name: Controller forced stop warning
Alarm content
Detail
Detail name
No.
E7.1 Controller (1) The forced stop signal
forced stop
warning
Alarm No.: E8 Name: Cooling fan speed reduction warning
Alarm content
Detail
Detail name
No.
E8.1 Decreased (1)
cooling fan
speed warning
(2) Cooling fan life expired. Check the total of
E8.2 Cooling fan stop Check it with the check method for [AL. E8.1].
Alarm No.: E9 Name: Main circuit off warning
Alarm content
Detail
Detail name
No.
E9.1 Servo-on signal (1) The main circuit power
on during main
circuit off
(2)
(3)
(4) The servo amplifier is
EM2/EM1 (Forced stop) turned off.
Cause
Check the status of
turned off. EM2/EM1.
An external 24 V DC Check if the external
power supply have not 24 V DC power supply
inputted. is inputted.
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
The forced stop signal of the servo system controller was enabled.
Cause
Check if the servo
of the servo system system controller is a
controller was inputted. forced stop status.
The cooling fan speed decreased to the warning occurrence level or less.
Cause
Foreign matter caught in Check if a foreign
the cooling fan and the matter is caught in the
speed was decreased. cooling fan.
power on time of the
servo amplifier.
The servo-on command was inputted with main circuit power supply off.
The bus voltage dropped during the servo motor driving under 50 r/min.
Cause
Check if the main
supply is off. circuit power supply is
inputted.
The main circuit power Check the main circuit
supply connector was power supply
disconnected. connector.
The bus voltage is less Check the bus voltage. The voltage is lower
than the prescribed
value.
200 V amplifier:
215 V DC
400 V amplifier:
430 V DC
Replace the servo
malfunctioning. amplifier, and then
check the
repeatability.
Check method Check result
It is off.
It is on.
It is not inputted.
It is inputted.
It is not repeatable.
Check method Check result
It is the forced stop
status.
Check method Check result
Something has been
caught.
Nothing has been
caught.
It exceed the cooling
fan life.
Check method Check result
It is not inputted.
It is inputted.
It is disconnected.
It has no failure.
than the prescribed
value.
The voltage is the
prescribed value or
higher.
It is not repeatable.
1 - 60
Action Target
Ensure safety and [A]
turn on EM2/EM1 [B]
(Forced stop). [WB]
[RJ010]
Check (2).
Input the 24 V DC
power supply.
Check (3).
Replace the servo
amplifier.
Action Target
Ensure safety and [B]
cancel the forced stop [WB]
signal of the [RJ010]
controller.
Action Target
Remove the foreign [A]
matter. [B]
[WB]
Check (2).
[RJ010]
Replace the servo
amplifier.
Action Target
Turn on the main [A]
circuit power. [B]
[WB]
Check (2).
[RJ010]
Connect it correctly.
Check (3).
Review the wiring.
Check the power
supply capacity.
Check (4).
Replace the servo
amplifier.