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6. Troubleshooting
6 - 26
Alarm No.
50
Overload 1
The overload detection level reached 100% or more. The motor or drive unit is in the overload state.
Investigation details Investigation results Remedies SV SP
The standard values (below) are not
set.
Servo : SV021 = 60, SV022 = 150
Spindle : SV063 = 60, SP064 = 110
Set the standard values.
1 Check the overload parameters.
Servo : SV021, SV022
Spindle : SP063, SP064
The standard values are set. Investigate item 2.
{ {
The load is large. Servo : Investigate item 3.
Spindle : Investigate item 7.
2 Check the overload % (servo) or load
meter (spindle).
The load is not large. Investigate item 9.
{ {
Resonance is occurring. Adjust the parameters.
• Set the notch filter.
• Lower VGN1 (SV005).
3 Check whether machine resonance is
occurring.
Resonance is not occurring. Investigate item 4.
{
The motor is hunting. Adjust the parameters.
• Increase VGN1 (SV005).
• Lower VIA (SV008).
4 Check whether the shaft sways when
the motor is stopped. (Hunting)
The motor is not hunting. Investigate item 5.
{
The motor brakes are not released. Correct the faulty section. 5 Check the brake operation
Check the brake relay.
Check the connector (CN20)
connection.
The motor brake operation is normal. Investigate item 6.
{
The cutting load is large. Lower the cutting load.
There is interference with the
positioning pin.
When using the positioning pin, turn
the servo OFF when stopped.
An excessive force is applied from
the machine.
Check whether the ball screw is bent,
or whether there is a fault in the
guide.
6 Check the load current with the NC
Servo Monitor, and investigate the
machine load.
The machine load is not large. Investigate item 8.
{
There is a problem. Adjust the PLG output waveform. 7 Check the PLG output waveform.
Normal Investigate item 8.
{
The motor performance is
insufficient.
Lower the acceleration/deceleration
rate or cutting load.
8 Confirm the motor capacity selection
again.
The motor performance is sufficient. Investigate item 9.
{ {
Improved. Replace the drive unit. 9 Try replacing the drive unit.
Not improved. Replace the motor.
{ {
(Note) NR and PR resetting are not possible when the overload level is 50% or more. Do not forcibly reset (AR) by turning the unit
power OFF. If AR resetting is used at 50% or higher, the level is set to 80% when the power is turned ON next. (Servo)