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MDS-D2/DH2 Series Instruction Manual
7.3 Troubleshooting
Alarm No.
3B
Power module overheat
Thermal protection function in the power module has started its operation.
Investigation details Investigation results Remedies SV SP
1
Check that the fan of the drive unit is rotating
correctly.
Large amounts of cutting oil or cutting chips,
etc., are adhered to the fan, or the rotation is
slow.
Clean or replace the fan.
◯◯
The fan is rotating properly. Check the investigation item No. 2.
2 Check whether the heat dissipating fins are dirty.
Cutting oil or cutting chips, etc., are adhered,
and the fins are clogged.
Clean the fins.
◯◯
Cutting chips etc. are not adhered to the fins. Check the investigation item No. 3.
3 Measure the drive unit's ambient temperature.
55°C or more.
Improve the efficiency cooling for the power
distribution panel.
◯◯
Less than 55°C. Check the investigation item No. 4.
4
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.
◯◯
Alarm No.
3C
Regeneration circuit error:
An error was detected in the regenerative transistor or in the regenerative resistor.
Investigation details Investigation results Remedies SV SP
1 Check if an external regenerative resistor is used.
An external regenerative resistor is used. Check the investigation item No. 3.
◯
A built-in regenerative resistor is used. Check the investigation item No. 2.
2
Is the short wire connected between P and D
terminal?
Are there any problems with the connection
condition? (looseness of the screw)
The wire is not connected. Connect the wire.
◯
The connector is disconnected.
The connector has a contact fault.
Reconnect the connector.
Replace the connector.
The connection is correct. Replace the drive unit.
3
Is the connection of the regenerative resistor or
regeneration resistor cable correct?
The wire is not connected. Connect the wire.
◯◯
The connection is correct. Check the investigation item No. 4.
4
Is the regeneration resistor or the regeneration
resistor cable broken?
Disconnect the regenerative resistor terminal and
check the resistance value with a tester.
The regeneration resistor is broken.
Or the resistance value is different from the
specified value.
Replace the regenerative resistor.
◯◯
The regeneration resistor cable is broken. Replace the cable.
The resistance value is normal. Replace the drive unit.
Alarm No.
3D
Power supply voltage error at acceleration/deceleration:
A motor control error was detected at acceleration/deceleration due to an input voltage drop.
Investigation details Investigation results Remedies SV SP
1
Measure the input voltage during operations with a
tester.
During operations, the voltage fluctuates
widely.
Increase the power capacity (KVA).
◯
-
During operations, the voltage is stable. Check the investigation item No. 2.
2 Check the load inertia.
The load inertia (workpiece etc.) is
excessive.
[1] Lower the load inertia.
[2] Extend the rapid traverse time constant
for G0/G1.
◯
-
The load inertia is normal. Check the investigation item No. 3.
3 Check the cooling fan of the drive unit.
The fan is stopped.
Replace the fan. If the state is not improved,
replace the drive unit.
◯
-
The fan is rotating correctly. Check the investigation item No. 4.
4
Check the ambient temperature of the drive unit
during operation.
The ambient temperature exceeds the
specified value.
Correct the ambient temperature within the
specified value.
◯
-
There is no problem in temperature. Replace the drive unit.
Alarm No.
3E
Magnetic pole position detection error:
The magnetic pole position is not reliable in the magnetic pole position detection control.
This alarm occurs at the detection level which is set in SV094.
Investigation details Investigation results Remedies SV SP
1
Adjust the setting value of the servo parameter
SV094 and detect the magnetic pole position.
Set SV094.
Set SV094.
The standard value for a rotary motor is 10.
The standard value for a linear motor is 10.
◯
-
SV094 is set.
Set the optimal value allowing for the
coasting distance (Increase the value).