Chapter 8 Troubleshooting
8-10
8-3-2 Warnings
When a warning occurs, a warning No. will appear on the CNC monitor screen and with the LEDs on
the front of the amplifier. Check the warning No., and remove the cause of the warning by following
this list.
No. Name Details Cause of occurrence Investigation method Remedy
The vertical axis or slant axis
dropped when the CNC power
was turned ON.
93 Initial absolute
position
fluctuation
The position data
fluctuated when
creating the initial
absolute position.
The axis moved due to an
external force when the CNC
power was turned ON.
Check the state of the axis
when the CNC power was
turned ON.
Repair the fault
section.
9E Absolute
position
detector:
Revolution
counter error
There was an error in
the data of the multi-
rotation counter in the
detector.
Detector fault Check the repeatability. Replace the
detector.
Battery life The battery life is approx. 5
years. (This will change
according to the usage state.)
Replace the battery.
The battery connector (in the
amplifier) is disconnected.
Open the panel at the top of the
amplifier and check.
Connect correctly.
9F Battery voltage
drop
The battery voltage
dropped.
Do not shut off the
servo amplifier control
power supply when this
warning is detected.
(This is to protect the
absolute position.)
The battery line in the detector
cable is broken.
Check the conductivity with a
tester.
Replace the cable.
E0 Over
regeneration
warning
The regeneration level
reached 80% or more.
Refer to the over-regeneration (30) column.
E1 Overload
warning
The load level
reached 80% or more.
Refer to the overload (50) column.
E2 Continuous
high-speed
revolution
warning
The motor continuously
rotated at a speed
exceeding the rated
rotation speed.
Rotary axis program command Check whether the motor is
continuously rotating at a speed
exceeding the rated rotation
speed.
Apply a duty when
rotating at a speed
exceeding the rated
rotation speed.
E3 Absolute
position counter
warning
A deviation was
detected in the
absolute position data
and relative position
data
There is an error in the
detector’s multi-rotation data
Check the movement of the
multi-rotation data (Rn) from the
CNC monitor screen.
Replace the
detector.
E4 Set parameter
warning
A parameter
exceeding the setting
range was set.
The parameter setting range is
not within the range.
Check the parameter setting
conditions.
Set correctly.
E6 Control axis
detachment
warning
Control axis removal
was commanded.
(Status display)
Control axis removal was input
from the CNC unit sequence.
The control axis removal has been input correctly.
The CNC emergency stop has
been input.
The CNC emergency stop has been input correctly.
An alarm is occurring with
another axis.
Has an alarm occurred with
another axis?
Reset the alarm in
the other axis to
cancel this warning.
E7 In NC
emergency stop
state
Emergency stop was
input from the NC
(Status display)
The terminator or battery unit
connector is disconnected.
Check the connection of the
CNC communication line cable
(CN1A, CN1B).
Set correctly.
E9 Instantaneous
power
interruption
warning
The power was cut off
for 25msec or more
but 50msec or less.
Refer to the instantaneous stop (4F) column.
EA In external
emergency stop
state
External emergency
stop (CN3 connector
input) was input.
Only the external emergency stop was input without inputting the CNC unit
emergency stop.
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