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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
45
Fan stop
A cooling fan built in the drive unit stopped, and overheat occurred in the power module.
Investigation details Investigation results Remedies SV SP
1
Turn the unit power ON again, and confirm the
rotation of the fan.
Note) Assure more than 10 seconds for the time
from when the power is turned OFF till when it is
turned ON. For the fan used for the drive unit,
assuring more than 10 seconds for the time from
when the power is turned OFF till when it is turned
ON is required.
The fan is rotating, and an alarm did not
occur again.
Continue to use.
The power may be turned ON without
assuring more than 10 seconds for the time
from when the power is turned OFF till when
it is turned ON.
Leave for more than 10 seconds, and turn the
power ON again.
◯◯
The fan did not rotate. Or, an alarm occurred
again.
Check the investigation item No. 2.
2
Check if the connector connected to a fan is
loosened or disconnected in the unit.
[1]The connector is loosened.
[2]The connector is disconnected.
Correctly connect the connector.
Replace the fan.
◯◯
[1]The connector is not loosened.
[2]The connector is not disconnected.
Check the investigation item No. 3.
3 Check if oil or cutting chips are adhered to the fan.
Oil or cutting chips are adhered.
Improve the use environment and
replace the drive unit.
◯◯
Oil or cutting chips are not adhered.
The cable may be broken.
Replace the fan.
Replace the drive unit.
Alarm No.
46
Motor overheat / Thermal error
Thermal protection function of the motor or in the encoder, has started its operation.
Investigation details Investigation results Remedies SV SP
1
Check the repeatability.
(Note) For the spindle, check the "temperature" of
the "spindle unit" displayed on the drive monitor
screen.
[1] The alarm occurs before operation.
[2] The "temperature" displayed on the drive
monitor screen is different from ambient
temperature.
Check the investigation item No. 2.
◯◯
[1] The alarm occurs after the operation
continues for a while.
[2] The "temperature" displayed on the drive
monitor screen rises drastically during the
spindle operation.
Check the investigation item No. 5.
2
Jiggle the encoder connectors (drive unit side and
encoder side) and check if they are disconnected.
The connector is disconnected (or loose). Correctly install.
◯◯
The connector is not disconnected. Check the investigation item No. 3.
3
Turn the power OFF, and check the encoder cable
connection with a tester.
The connection is faulty. Replace the cable.
◯◯
The connection is normal. Check the investigation item No. 4.
4
When using MDS-B-HR, check if the motor is
validated even if a motor thermal is not provided?
SV034/bit2 = 0 Set SP034/bit2 to 1.
◯
SV034/bit2 = 1 Check the investigation item No. 5.
5
Check the overload % (servo) or load meter
(spindle).
The load is large.
Servo:
Check the investigation item No. 6.
Spindle:
Check the investigation item No. 8.
◯◯
The load is not large. Check the investigation item No. 9.
6 Is the unbalance torque high?
The constant load torque (friction +
unbalance) is 60% or more.
Select the motor so that the constant load
torque is 60% or less.
◯
The constant load torque is less than 60%. Check the investigation item No. 7.
7
Was the overload alarm (50) forcibly reset by
turning the drive unit power OFF?
The alarm was forcibly reset.
Do not turn the drive unit's power OFF when
an overload alarm occurs. (The NC power
can be turned OFF.)
◯◯
The alarm was not forcibly reset. Check the investigation item No. 9.
8 Check the parameter settings.
The parameter is not set correctly. Correctly set.
◯
The parameter is set correctly. Check the investigation item No. 9.
9
Measure the motor temperature when the alarm
occurs.
(Note) For the spindle motor, check the
"temperature" of the "spindle unit" shown on the
drive monitor screen.
The motor unit is hot. Check the investigation item No. 10.
◯◯
The motor is not hot. Check the investigation item No. 12.
10
When using a motor with fan, check whether the fan
is stopped, or it is clogged with dust, etc.
The motor fan was stopped. Check the investigation item No. 11.
◯◯
The motor fan wind flow is poor.
Clean the fan and ventilation holes inside of
the motor.
The direction of the ventilation is opposite. Change the connected phase sequence.
11 Check the fan wiring.
There is no problem. Check the investigation item No. 12.
◯◯
The cable is broken. Replace the cable.
The cable is not broken. Replace the fan.
12
Replace the drive unit or motor with another drive
unit or motor, and check whether the fault is on the
drive unit side or motor side
The alarm is on the drive unit side. Replace the drive unit.
◯◯
The alarm is on the motor side. Replace the motor.
13
Check if there is any abnormality in the unit's
ambient environment.
(Ex. Ambient temperature, noise, grounding)
Take remedies according to the causes of the abnormality in the ambient environment.
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