Mitsubishi Electric FR-E710W-0.1K, Инструкция по эксплуатации

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298
Causes and corrective actions
∗1
Resetting the inverter initializes the internal thermal integrated data of the electronic thermal relay function.
Operation panel
indication
E.THM
FR-PU04
FR-PU07
Motor Ovrload
Name
Motor overload trip (electronic thermal relay function)
∗1
Description
The electronic thermal relay function in the inverter detects motor overheat due to overload or reduced cooling
capability during constant-speed operation and pre-alarm (TH display) is output when the integrated value reaches
85% of the
Pr. 9 Electronic thermal O/L relay setting and the protection circuit is activated to stop the inverter output
when the integrated value reaches the specified value. When running a special motor such as a multi-pole motor or
multiple motors, provide a thermal relay on the inverter output side since such motor(s) cannot be protected by the
electronic thermal relay function.
Check point
Check the motor for use under overload.
Check that the setting of
Pr. 71 Applied motor for motor selection is correct. (Refer to page 118).
Check that stall prevention operation setting is correct.
Corrective action
Reduce the load weight.
For a constant-torque motor, set the constant-torque motor in
Pr. 71 Applied motor
.
Check that stall prevention operation setting is correct. (Refer to page 92).
Operation panel
indication
E.FIN
FR-PU04
FR-PU07
H/Sink O/Temp
Name
Heatsink overheat
Description
If the heatsink overheats, the temperature sensor is actuated and the inverter trips.
The FIN signal can be output when the temperature becomes approximately 85% of the heatsink overheat protection
operation temperature. For the terminal used for the FIN signal output, assign the function by setting "26 (positive
logic) or 126 (negative logic)" in any of
Pr. 190 to Pr. 192 (output terminal function selection) . (Refer to page 145).
Check point
Check for too high surrounding air temperature.
Check for heatsink clogging.
Check that the cooling fan is not stopped (Check that is not displayed on the operation panel).
Corrective action
Set the surrounding air temperature to within the specifications.
Clean the heatsink.
Replace the cooling fan.
Operation panel
indication
E.ILF
FR-PU04 Fault 14
FR-PU07 Input phase loss
Name Input phase loss
∗
Description
Inverter trips when function valid setting (=1) is selected in Pr. 872 Input phase loss protection selection and one phase of
the three phase power input is lost. (Refer to page 172).
It may be available if phase-to-phase voltage of the three-phase power input becomes largely unbalanced.
Check point
Check for a break in the cable for the three-phase power supply input.
Check that phase-to-phase voltage of the three-phase power input is not largely unbalanced.
Corrective action
Wire the cables properly.
Repair a break portion in the cable.
Check the
Pr. 872 Input phase loss protection selection setting.
Set Pr. 872 = "0" (without input phase loss protection) when three-phase input voltage is largely unbalanced.
∗
Available only for three-phase power input model.
Operation panel
indication
E.OLT
FR-PU04
FR-PU07
Stll Prev STP (OL shown during stall prevention operation)
Name Stall prevention stop
Description
If the output frequency has fallen to 1Hz by stall prevention operation and remains for 3s, a fault (E.OLT) appears and
trips the inverter. OL appears while stall prevention is being activated.
E.OLT may not occur if stall prevention (OL) is activated during output phase loss.
Check point
Check the motor for use under overload. (Refer to page 93).
Corrective action
Reduce the load weight. (Check the Pr. 22 Stall prevention operation level setting.)