5.4 Fault Detection
128 YASKAWA ELECTRIC EZZ010928 FSDrive-MV1000 Instructions
Digital Operator Display Fault Name
SEr
Too Many Speed Search Restarts
The number of Speed Search restarts exceeded the number set to b3-19.
Cause Possible Solution
Speed Search parameters are set to the wrong
values.
⇒Reduce the detection compensation gain during Speed Search (b3-10).
⇒Increase the current level when attempting Speed Search (b3-17).
⇒Increase the detection time during Speed Search (b3-18).
⇒Repeat Auto-Tuning.
Digital Operator Display Fault Name
TME
Transformer Temperature Fault
The temperature of the transformer has increased and has exceeded the protection level set
to L8-87.
Cause Possible Solution
Cooling fan fault ⇒If the cooling airflow is inadequate, replace the cooling fan.
The intake filter is soiled. ⇒If the intake filter is soiled, clean it.
Parameter setting error ⇒Check the parameter settings.
Thermistor fault and disconnected signal line
⇒If the problem occurs even at a low temperature, for example immediately after
switching on the power, contact Yaskawa or your nearest sales representative.
Digital Operator Display Fault Name
TME1
Transformer Temperature Fault 1
The temperature of the transformer has increased and has exceeded the temperature fault
level.
Cause Possible Solution
Cooling fan fault ⇒If the cooling airflow is inadequate, replace the cooling fan.
The intake filter is soiled. ⇒If the intake filter is soiled, clean it.
Parameter setting error ⇒Check the parameter settings.
Thermistor fault and disconnected signal line
⇒If the problem occurs even at a low temperature, for example immediately after
switching on the power, contact Yaskawa or your nearest sales representative.
Digital Operator Display Fault Name
TME2
Transformer Temperature DI Fault
A fault was detected from a contact input terminal (transformer overheat) on the control
board.
Cause Possible Solution
Cooling fan fault ⇒If the cooling airflow is inadequate, replace the cooling fan.
The intake filter is soiled. ⇒If the intake filter is soiled, clean it.
Overheated transformer and disconnected
signal line
⇒If the problem occurs even at a low temperature, for example immediately after turning
the power on, contact Yaskawa or your nearest sales representative.
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer
than the allowable time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the
load.
⇒Check the settings of parameters L6-02 and L6-03.
Fault on the machine side.
Example: If there is undertorque, the pulley
belt may be broken.
Check the status of the machine.
⇒Remove the cause of the fault.
Digital Operator Display Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer
than the allowable time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the
load.
⇒Check the settings of parameters L6-05 and L6-06.
Fault on the machine side.
Example: If there is undertorque, the pulley
belt may be broken.
Check the load for any problems.
⇒Remove the cause of the fault.
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