Mitsubishi Electric FR-D700 Series, Инструкция по эксплуатации

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Causes and corrective actions
Operation panel
indication
E.OV1
FR-PU04
FR-PU07
OV During Acc
Name Regenerative overvoltage trip during acceleration
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 and the inverter trips. The circuit may also be activated by a surge voltage produced
in the power supply system.
Check point
1. Check for too slow acceleration. (e.g. during downward acceleration in vertical lift load)
2. Check that the
Pr. 22 Stall prevention operation level is not lower than the no load current.
Corrective action
1. Decrease the acceleration time.
Check that regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886) is used. (Refer to page 223).
2. Set a value larger than the no load current in Pr. 22 Stall prevention operation level .
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
1. Check for sudden load change.
2. Check that the
Pr. 22 Stall prevention operation level
is not lower than the no load current.
Corrective action
1. Keep load stable.
Check that regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886)
is used.
(Refer to page 223).
Use the brake resistor, brake unit or power regeneration common converter (FR-CV) as required.
2. Set a value larger than the no load current in
Pr. 22 Stall prevention operation level
.
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.
Corrective action
Increase the deceleration time. (Set the deceleration time which matches the moment of inertia of the load)
Longer the brake cycle.
Use regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886) . (Refer to page 223).
Use the brake resistor, brake unit or power regeneration common converter (FR-CV) as required.
Operation panel
indication
E.THT
FR-PU04
FR-PU07
Inv. Overload
Name
Inverter overload trip (electronic thermal 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 (200% or less), the electronic thermal
relay activates to stop the inverter output. (Overload capacity 150% 60s, 200% 0.5s)
Check point
1. Check that acceleration/deceleration time is not too short.
2. Check that torque boost setting is not too large (small).
3. Check that load pattern selection setting is appropriate for the load pattern of the using machine.
4. Check the motor for use under overload.
5. Check for too high surrounding air temperature.
Corrective action
1. Increase acceleration/deceleration time.
2. Adjust the torque boost setting.
3. Set the load pattern selection setting according to the load pattern of the using machine.
4. Reduce the load weight.
5. Set the surrounding air temperature to within the specifications.