Remedies For Warnings - Mitsubishi Electric MR-J2S B Series Instruction Manual

9. TROUBLESHOOTING

9.3 Remedies for warnings

If servo forced stop warning (E6), controller forced stop warning (E7) or SSCNET error warning (EE)
occurs, the servo off status is established. If any other warning occurs, operation can be continued but an
alarm may take place or proper operation may not be performed. Eliminate the cause of the warning
according to this section. Use the MR Configurator (servo configuration software) to refer to the cause of
warning.
Display Name
92 Open battery
cable warning
96 Home position
setting warning
Battery warning Voltage of battery for
9F
E0 Excessive
regenerative
warning
E1 Overload
warning
E3 Absolute position
counter warning
E4 Parameter
warning
E6 Servo forced stop
warning
E7 Controller forced
stop warning
E9 Main circuit off
warning
EE SSCNET error
warning
POINT
When any of the following alarms has occurred, do not resume operation
by switching power of the servo amplifier OFF/ON repeatedly. The servo
amplifier and servo motor may become faulty. If the power of the servo
amplifier is switched OFF/ON during the alarms, allow more than 30
minutes for cooling before resuming operation.
Excessive regenerative warning (E0)
Overload warning 1 (E1)
Definition
Absolute position
detection system battery
voltage is low.
Home position return
could not be made in the
precise position.
absolute position
detection system reduced.
There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
resistor or regenerative
option.
There is a possibility that
overload alarm 1 or 2
may occur.
Absolute position encoder
pulses faulty.
Parameter outside
setting range.
EM1 is off.
Servo-on command was
issued with main circuit
power off.
The servo system
controller connected is
not SSCNET-compatible.
Cause
1. Battery cable is open.
2. Battery voltage supplied from the servo
amplifier to the encoder fell to about
3.2V or less.
(Detected with the encoder)
1. Droop pulses remaining are greater
than the in-position range setting.
2. Home position return was executed
during operation command.
3. Creep speed high.
Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier)
Regenerative power increased to 85% or
more of permissible regenerative power of
built-in regenerative resistor or
regenerative option.
Checking method
Call the status display and check
regenerative load ratio.
Load increased to 85% or more of overload
alarm 1 or 2 occurrence level.
Cause, checking method
Refer to 50, 51.
1. Noise entered the encoder.
2. Encoder faulty.
Parameter value set from servo system
controller is outside setting range
External forced stop was made valid.
(EM1 turned off.)
Forced stop signal was entered into the
servo system controller.
9 - 8
Action
Repair cable or changed.
Change the battery.
Remove the cause of droop pulse
occurrence.
Reduce creep speed.
Change the battery.
1. Reduce frequency of
positioning.
2. Change regenerative option
for the one with larger
capacity.
3. Reduce load.
Refer to 50, 51.
Take noise suppression
measures.
Change the servo motor.
Set it correctly.
Ensure safety and deactivate
forced stop.
Ensure safety and deactivate
forced stop.
Switch on main circuit power.