Mitsubishi Electric A800 Plus Series Function Manual page 10

Average current load detection
• For the SND rating, the Y239 signal is output when the output current average value reaches or exceeds 50% of the
inverter rated current.
• For the SND rating, when the instantaneous load factor reaches or exceeds 155% of the inverter rated current while the
output current average value is 50% or more of the inverter rated current, the protective function (E.THS) is activated,
shutting off the inverter output.
% value to the inverter
rated current
155%
50%
Y239
NOTE
• The output current average value is reset to the initial value by the inverter's power reset or the reset signal input. Avoid
unnecessary reset and power-OFF.
• E.THS is available for the FR-A840-03250(110K) or higher.
Operation panel
indication
Name
Overload trip (Data code: 252 (HFC))
For the SND rating, when the instantaneous load factor reaches or exceeds 155% of the inverter rated
Description
current while the output current average value is 50% or more of the inverter rated current, the inverter trips.
• Check that acceleration/deceleration time is not too short.
• Check that torque boost setting is not too large (small).
• Check that load pattern selection setting is appropriate for the load pattern of the machine.
Check point
• Check the motor for the use under overload.
• Check that the encoder wiring and the specifications (encoder power supply, resolution, differential/
• Set the acceleration time longer.
• Adjust the torque boost setting.
• Set the load pattern selection setting according to the load pattern of the using machine.
Corrective action
• Reduce the load.
• Check the wiring and specifications of the encoder and the motor. Perform the setting according to the
∗1
The data code is used for checking the fault detail via communication or for setting Pr.997 Fault initiation. (Refer to the Instruction Manual
(Detailed) of the FR-A800 inverter.)
Instantaneous load factor
Output current average value
ON
E.THS
complementary) are correct. Check also that the motor wiring (U, V, W) is correct (under vector control).
specifications of the encoder and the motor (under vector control).
E.THS
FR-LU08
Fault 12
indication
∗1
SND rating
Time
INTRODUCTION
1
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