Warnings - Mitsubishi Electric MELSERVO MR-J2-A Product Specifications And Installation Manual

8. TROUBLESHOOTING

8-2-3 Warnings

If a warning occurs, the servo amplifier does not go into a servo off status. However, if operation is
continued in the warning status, an alarm may occur or proper operation not performed. Eliminate
the cause of the warning according to this section. Use the optional set-up software to refer to the
cause of warning.
Display Name
A. 92 Open battery
cable warning
A. 96 Zero setting error
A. 9F Battery warning
A. E0 Excessive regen-
erative load warn-
ing
A. E1 Overload warning
A. E3 Absolute position
counter warning
A. E5 ABS time-out
warning
A. E6 Servo emergency
stop
A. E9 Main circuit off
warning
A. EA ABS servo on
warning
Definition
Absolute position detection
system battery voltage is low.
1. For incremental, return to
origin point could not be
performed.
2. For absolute position
detection system, origin
point setting could not be
performed.
Absolute position detection
system battery voltage is low.
There is a possibility that rege-
nerative power may exceed
permissible regenerative power
of built-in regenerative brake
resistor or regenerative brake
option.
There is a possibility that over-
load alarm 1 or 2 may occur.
Absolute position encoder
pulses faulty.
Absolute position data transfer
fault
EMG-SG are open.
Servo on signal (SON) was
switched on with main circuit
power off.
Servo on signal (SON) was not
switched on within 1s after
servo amplifier went into
absolute position data transfer
mode.
8– 13
Cause
1. Battery cable is open.
2. Battery voltage dropped to 2.8V
or less.
1. Command pulses were input
after droop pulses had been
cleared.
2. Droop pulses remaining are
greater than in-position range
setting.
3. Creep speed is high.
Battery voltage dropped to 3.2V
or less.
Regenerative power increased to
85% or more of permissible rege-
nerative power of built-in regene-
rative brake resistor or regenerat-
ive brake 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 A. 50, 51.
1. Noise entered the encoder.
2. Encoder faulty.
1. Programmable controller's
ladder program error
2. Mis-wiring of CN1B-9 pin,
CN1B-6 pin
External emergency stop was
made valid. (EMG-SG were
opened.)
Servo on signal (SON) was
switched on with main circuit
power off.
1. Programmable controller's
ladder program error
2. Mis-wiring of SON signal
Action
Repair cable or change
battery.
Change battery.
Make provisions so that
command pulses are
not input after droop
pulses are cleared.
Reduce creep speed.
Change battery.
1. Reduce frequency
of positioning.
2. Change regenerative
brake option for the
one with larger
capacity.
3. Reduce load.
Refer to A. 50, 51.
Take noise suppress-
ion measures.
Change servo motor.
Correct program.
Connect correctly.
After ensuring safety,
reset emergency stop.
Switch on main circuit
power.
Correct program
Connect correctly.
8