Mitsubishi Electronics MR-J2S- B User Manual

9 - 8

9. TROUBLESHOOTING

9.3 Remedies for warnings

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)

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

Definition

Cause

Action

1. Battery cable is open.

Repair cable or changed.

Open battery
cable warning

Absolute position
detection system battery
voltage is low.

2. Battery voltage supplied from the servo

amplifier to the encoder fell to about
3.2V or less.
(Detected with the encoder)

Change the battery.

1. Droop pulses remaining are greater

than the in-position range setting.

Remove the cause of droop pulse
occurrence.

2. Home position return was executed

during operation command.

Home position
setting warning

Home position return
could not be made in the
precise position.

3. Creep speed high.

Reduce creep speed.

Battery warning Voltage of battery for

absolute position
detection system reduced.

Battery voltage fell to 3.2V or less.
(Detected with the servo amplifier)

Change the battery.

Excessive
regenerative
warning

There is a possibility that
regenerative power may
exceed permissible
regenerative power of
built-in regenerative
resistor or regenerative
option.

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.

1. Reduce frequency of

positioning.

2. Change regenerative option

for the one with larger
capacity.

3. Reduce load.

Overload
warning

There is a possibility that
overload alarm 1 or 2
may occur.

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.

Take noise suppression
measures.

Absolute position
counter warning

Absolute position encoder
pulses faulty.

2. Encoder faulty.

Change the servo motor.

Parameter
warning

Parameter outside
setting range.

Parameter value set from servo system
controller is outside setting range

Set it correctly.

Servo forced stop
warning

EM1 is off.

External forced stop was made valid.
(EM1 turned off.)

Ensure safety and deactivate
forced stop.

Controller forced
stop warning

Forced stop signal was entered into the
servo system controller.

Ensure safety and deactivate
forced stop.

Main circuit off
warning

Servo-on command was
issued with main circuit
power off.

Switch on main circuit power.

SSCNET error
warning

The servo system
controller connected is
not SSCNET-compatible.