Mitsubishi MELDAS MDS-C1 Instruction Manual page 270

Overload 1
Alarm No.
The overload detection level reached 100% or more. The motor or drive unit is in the overload state.
50
Investigation details
1 Check the overload parameters.
Servo : SV021, SV022
Spindle : SP063, SP064
2 Check the overload % (servo) or load
meter (spindle).
3 Check whether machine resonance is
occurring.
4 Check whether the shaft sways when
the motor is stopped. (Hunting)
5 Check the brake operation
• Check the brake relay.
• Check the connector (CN20)
connection.
6 Check the load current with the NC
Servo Monitor, and investigate the
machine load.
7 Check the PLG output waveform.
8 Confirm the motor capacity selection
again.
9 Try replacing the drive unit.
(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)
6. Troubleshooting
Investigation results
The standard values (below) are not
set.
Servo : SV021 = 60, SV022 = 150
Spindle : SV063 = 60, SP064 = 110
The standard values are set.
The load is large.
The load is not large.
Resonance is occurring.
Resonance is not occurring.
The motor is hunting.
The motor is not hunting.
The motor brakes are not released.
The motor brake operation is normal. Investigate item 6.
The cutting load is large.
There is interference with the
positioning pin.
An excessive force is applied from
the machine.
The machine load is not large.
There is a problem.
Normal
The motor performance is
insufficient.
The motor performance is sufficient.
Improved.
Not improved.
6 - 25
Remedies
Set the standard values.
Investigate item 2.
Servo : Investigate item 3.
Spindle : Investigate item 7.
Investigate item 9.
Adjust the parameters.
• Set the notch filter.
• Lower VGN1 (SV005).
Investigate item 4.
Adjust the parameters.
• Increase VGN1 (SV005).
• Lower VIA (SV008).
Investigate item 5.
Correct the faulty section.
Lower the cutting load.
When using the positioning pin, turn
the servo OFF when stopped.
Check whether the ball screw is bent,
or whether there is a fault in the
guide.
Investigate item 8.
Adjust the PLG output waveform.
Investigate item 8.
Lower the acceleration/deceleration
rate or cutting load.
Investigate item 9.
Replace the drive unit.
Replace the motor.
SV SP