Chapter 10 Troubleshooting
10–5
No.
Name
Details
Cause of occurrence
Investigation method
Remedy
The communication
cable is disconnected.
Check the connector (CN1A, CN1B).
(Including the other axes)
Set correctly.
36 CNC
communication,
transmission
error
The communication
from the CNC was
cut off.
The communication
cable is broken.
Check the conductivity with a tester.
Replace the cable.
The parameter is not
within the setting range.
Check the setting range of the parameter
having the error NO.
Set correctly.
The HEX setting
parameter setting is
incorrect.
SV025: A non-entered motor type was
selected.
SV027: lmc 1 and 2 were set.
Set correctly.
The electronic gears'
constant is overflowing.
The error No. is 101 (2301).
Check parameters SV001, SV002 and
SV018.
If the settings are OK,
consult with
Mitsubishi.
37 Initial parameter
error
The servo
parameter setting is
incorrect.
Check the error
parameter No. If
there are several
error parameters,
the most recent No.
is output.
The SHG control option
setting is not provided.
The error No. is 104 (2304).
Check parameters SV057 and SV058.
Set correctly.
The communication
cable is broken.
Check the conductivity with a tester.
The communication
cable connection is
incorrect.
Are the communication pair cables
connected in reverse?
Replace the cable.
The grounding is
incomplete.
Check the grounding state.
Correctly ground.
Amplifier fault
Replace the amplifier.
38 CNC
communication,
protocol error 1
There was an error
in the
communication
data from the CNC.
CNC unit fault
Change the connection with that for another
amplifier and find the cause.
Replace the CNC unit.
The communication
cable is broken.
Check the conductivity with a tester.
The communication
cable connection is
incorrect.
Are the communication pair cables
connected in reverse?
Replace the cable
The grounding is
incomplete.
Check the grounding state.
Correctly ground.
Amplifier fault.
Replace the amplifier.
39 CNC
communication,
protocol error 2
There was an error
in the
communication
data from the CNC.
CNC unit fault.
Change the connection with that for another
amplifier and find the cause.
Replace the CNC unit.
Is VGN1 higher than the standard value in
respect to the load inertia?
The speed loop gain
(VGN1) is excessive.
Is vibration occurring?
Lower VGN1.
The current loop gain
setting is incorrect.
Check the current loop gain.
Set the standard
value.
3A Overcurrent
The motor drive
current is
excessive.
Amplifier and detector
fault
Check the repeatability.
Replace the amplifier
and the detector.
Regenerative resistor
error
3C Regenerative
circuit error
An error was
detected in the
regenerative
transistor or
resistor.
The regenerative
transistor is damaged
by a short circuit.
Check the repeatability
Replace the amplifier.
The ambient
temperature is high.
Check the ambient temperature.
Improve the ambient
environment.
Has the overload alarm (50) cut off the
amplifier power and caused a forced reset?
46 Motor overheat
Overheating of the
motor was
detected.
The motor load is large.
Is the load too large?
Review the operation
pattern.
The power supply
connection is poor.
Is the connector or connection
disconnected?
Connect correctly.
Is the weather OK? (Has lightning
occurred?)
4F Instantaneous
stop
The power was cut
off for 50 msec or
more.
The power supply state
is poor.
When using overseas, there are cases
when the power supply is poor.
Review the power
supply.
The motor capacity is
insufficient.
Review the motor capacity selection.
Change the motor or
amplifier capacity.
The brakes cannot be
released.
Check the brake operation.
• Check the brake relay.
Repair the faulty
section.
Check the load current on the CNC servo
monitor and find the machine load.
Is the ball screw bent?
Replace the faulty
section in the
machine.
An excessive force is
being applied from the
machine.
Is there interference with the positioning
pin?
Do not use positioning
pins.
50 Overload 1
An excessive load
was applied for
longer than the set
time.
The parameter setting
is incorrect.
Are SV021 and SV022 set to the standard
values?
Set the standard
values.