303
Causes and corrective actions
Resetting the inverter initializes the internal accumulated heat value of the electronic thermal relay function.
Operation panel
indication
E.OV2
FR-PU04
FR-PU07
Stedy Spd OV
Name
Regenerative overvoltage trip during constant speed
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the specified value,
the protective circuit is activated to stop the inverter output. The circuit may also be activated by a surge voltage
produced in the power supply system.
Check point
Check for sudden load change.
Check that the setting of
Pr. 22 Stall prevention operation level
is not too small.
Check if the stall prevention operation is frequently activated in an application with a large load inertia.
Corrective action
Keep load stable.
Use regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886)
.
Use the brake resistor, brake unit or power regeneration common converter (FR-CV) as required.
Set the
Pr.22 Stall prevention operation level
correctly.
Set
Pr.154
Voltage reduction selection during stall prevention operation
= "11".
Operation panel
indication
E.OV3
FR-PU04
FR-PU07
OV During Dec
Name
Regenerative overvoltage trip during deceleration or stop
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the specified value,
the protective circuit is activated to stop the inverter output. The circuit may also be activated by a surge voltage
produced in the power supply system.
Check point
Check for sudden speed reduction.
Check if the stall prevention operation is frequently activated in an application with a large load inertia.
Corrective action
Increase the deceleration time. (Set the deceleration time which matches the moment of inertia of the load)
Make the brake cycle longer.
Use regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886)
.
Use the brake resistor, brake unit or power regeneration common converter (FR-CV) as required.
Set
Pr.154
Voltage reduction selection during stall prevention operation
= "11".
Operation panel
indication
E.THT
FR-PU04
FR-PU07
Inv. Overload
Name
Inverter overload trip (electronic thermal O/L relay function)
Description
If the temperature of the output transistor element exceeds the protection level under the condition that a current not
less than the rated inverter current flows and overcurrent trip does not occur (170% or less), the electronic thermal
relay activates to stop the inverter output. (Overload capacity 120% 60s, 150% 0.5s)
Check point
Check that acceleration/deceleration time is not too short.
Check that
Pr. 0 Torque boost
setting is not too large (small). (V/F control)
Check that
Pr. 14 Load pattern selection
setting is appropriate for the load pattern of the using machine. (V/F control)
Check the motor for use under overload.
Check for too high surrounding air temperature.
Corrective action
Increase acceleration/deceleration time.
Adjust the
Pr. 0 Torque boost
setting. (V/F control)
Set the
Pr. 14 Load pattern selection
setting according to the load pattern of the using machine. (V/F control)
Reduce the load weight.
Set the surrounding air temperature to within the specifications.
Operation panel
indication
E.THM
FR-PU04
FR-PU07
Motor Ovrload
Name
Motor overload trip
(electronic thermal O/L relay function)
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.
(V/F control, General-purpose magnetic
flux vector control)
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
. (V/F control, General-purpose
magnetic flux vector control)
Check that stall prevention operation setting is correct.
Содержание FR-F700PJ Series
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Страница 346: ...341 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...
