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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
5E
Safely limited: Feedback speed error
In safely limited mode, the motor speed was detected to exceed the safely limited speed.
Investigation details Investigation results Remedies SV SP
1 Check the DI input timing.
The feedback speed and safely limited speed
limit value are the same.
Reduce the commanded speed on the NC
side or increase the safely limited speed limit
value.
◯◯
The feedback speed is slower than the safely
limited speed.
Replace the drive unit.
2
Check the wiring and setting environment.
1) Correctly grounded?
2) Any noise generating devices around the unit?
3) Are the speed/position encoder cables correctly
shielded?
1) The grounding is incomplete. Correctly ground.
◯◯
2) The alarm occurs easily when a specific
device operates.
Use noise measures on the device described
on the left.
3) The cable is not correctly shielded. Correctly shield the cable.
No abnormality is found in particular. Replace the drive unit.
Alarm No.
5F
External contactor error
A contact of the external contactor is welding.
Investigation details Investigation results Remedies SV SP
1 Check whether the contactor's contact has melted.
The contactor is melted. Replace the contactor.
◯◯
The contactor is not melted. Check the investigation item No. 2.
2
Check whether the axis where an alarm occurred
was a contactor control axis.
The alarm occurred at the axis where the
contactor control is not executed.
Check the parameter. (DJ Series)
With contactor control
Servo:SV082, Spindle:SP227
0800h is added to the setting value.
Without contactor control
Change "Bit A,B" to "00" in the parameter
above.
◯◯
The alarm occurred at the axis where the
contactor control is executed.
Replace the drive unit.
Alarm No.
61
Power supply: Power module overcurrent
Overcurrent protection function in the power module of power supply has started its operation.
Investigation details Investigation results Remedies CV
1
Check the state of the operation when the alarm
occurs, and check the repeatability.
The alarm occurs immediately after 200VAC
is supplied or after READY is turned ON.
Replace the unit.
◯
The alarm occurs occasionally during
READY ON.
Check the investigation item No. 3.
The alarm occurs after continuous operation
for a long time.
The unit is hot.
Check the investigation item No. 2.
2 Check the load state of all motors (during stopped).
The total load of all motors exceeds the rated
capacity of the power supply unit.
Lower the motor load and operation
frequency.
◯
The total does not exceed the capacity. Check the investigation item No. 3.
3
Check the power capacity of the facility.
Check the capacity of the step-down transformer
(KVA).
The power capacity of the facility is
insufficient.
Increase the power capacity of the facility.
◯
The specified power capacity is secured. Check the investigation item No. 4.
4
Measure the voltage across wires.
Is the voltage 170V or more even when the motor is
accelerating?
The voltage drops to 170V or less
occasionally.
Increase the power capacity of the facility.
◯
The difference of the voltage across wires is
10V or more.
Improve the power phase balance.
The difference of the voltage across wires is
less than 10V.
Check the investigation item No. 5.
5
Check whether there is any device (machine)
causing the power distortion.
Abnormal noise is heard from an AC reactor
when stopping at the servo ON.
Improve the source of the distortion.
For example, when abnormal noise is heard
from another machine that is in operation,
move the wiring to the power which is far
from the machine's power supply.
◯
Abnormal noise is not heard. Check the investigation item No. 6.
6
Check if there is any abnormality in the unit's
ambient environment.
(Ex. Noise, grounding, etc.)
Take remedies according to the causes of the abnormality in the ambient environment.
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