Mitsubishi Electric MELDAS MDS-R Series Technical Specification And Instruction Manual page 190

Fan stop:
Alarm No.
A cooling fan built in the drive unit stopped, and the loads on the unit exceeded the specified value.
45
Cause of occurrence
The power is turned ON without assuring
1
more than 10 seconds for the time from
when the power is turned OFF till when it
is turned ON.
The connector connected to a fan is
2
disconnected.
Oil or cutting chips are adhered to the fan. Is oil or cutting chips adhered to the fan?
3
Motor overheat:
Alarm No.
Thermal protection function of the motor or in the detector, has started its operation.
46
Cause of occurrence
The ambient temperature is high.
1
The motor heat dissipation is poor.
2
Motor load is large.
3
Overload 1:
Alarm No.
Overload detection level became over 100%. The motor or the drive unit is overloaded.
50
Cause of occurrence
Machine resonance is occurring.
1
Hunting is occurring.
2
Motor performance is insufficient.
3
The motor brakes are not released.
4
An excessive force is applied from the
5
machine.
Parameters are incorrectly set.
6
(Note) PR resetting is 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.
10. Troubleshooting
Investigation items
Are more than 10 seconds for the time
from when the power is turned OFF till
when it is turned ON assured?
Is the connector connected to a fan
disconnected?
Is the cable broken?
Investigation items
Is there a source of heat near the motor? Take care when arranging sources of
Is the motor mounting flange thermally
shielded?
Is unbalance torque large?
Was the overload alarm (50) forcibly
reset by turning the drive unit power
OFF?
Investigation items
Is vibration noise heard?
Does the position droop fluctuate even
when the motor is stopped?
The axis is swaying or moving even
when the motor is stopped.
Review the motor capacity selection.
Check the brake operation.
• Check the brake relay.
• Check the connector (CN9)
connection.
Check the load current with the NC
servo monitor, and investigate the
machine load.
Is the ball screw bent?
Is there interference with the positioning
pin?
Are OLT (SV021) and OLL (SV022) set
to the standard values?
10 - 14
Remedy
Leave for more than 10 seconds, and
turn the power ON again.
If the fan is not rotating, check the
investigation item No. 2.
Correctly connect the connector. If it is
correctly connected, check the
investigation item No. 3.
Improve the use environment and
replace the drive unit.
Remedy
heat.
Provide means to shield heat.
Provide means to dissipate heat from
flange.
Select the motor so that the unbalance
torque is 60% or less.
Review the operation pattern.
Remedy
Adjust the parameters.
• Select the notch filter.
• Lower VGN1 (SV005).
Adjust the parameters.
• Increase VGN1 (SV005).
• Lower VIA (SV008).
Change the motor capacity.
Correctly any faulty section.
Correct any faulty machine section.
When using the positioning pin, turn the
servo OFF while stopped.
Set to the standard values.