Mitsubishi Electric FR-E700EX Instruction Manual page 280

Causes and corrective actions
Operation panel
E.OS
indication
Name
Overspeed occurrence
Description
Trips the drive unit if the motor speed exceeds Pr.374 Overspeed detection level.
 Check that Pr.374 Overspeed detection level is appropriate.
 Check if the three-phase (U, V, and W) wiring on the output side (load side) of the drive unit is correct. (Check for
Check point
phase loss.)
 Check for the rapid acceleration/deceleration.
 Set Pr.374 Overspeed detection level appropriately.
Corrective
 Wire the cables properly.
action
 Set the acceleration time longer. Set the speed control gain higher. Apply model adaptive speed control.
Operation panel
E.OSD
indication
Name Speed deviation excess detection
When Pr.285 Excessive speed deviation detection speed is set, this function stops the drive unit output if the motor speed is
Description
increased or decreased under the influence of the load etc. and cannot be controlled in accordance with the speed
command value. This protective function is not available in the initial status.
 Check if Pr.285 Excessive speed deviation detection speed and Pr.853 Speed deviation time are correctly set.
Check point
 Check for sudden load change.
Corrective
 Set Pr.285 Excessive speed deviation detection speed and Pr.853 Speed deviation time correctly .
 Keep the load stable.
action
Operation panel
E.OD
indication
Name Excessive position fault
Stops the output when the difference between the position command and the current position has exceeded the
Description
setting of Pr.427 Excessive level error under position control.
 Check for large load.
Check point
 Check that Pr.427 Excessive level error is appropriate.
Corrective
 Reduce the load.
action  Set Pr.427 Excessive level error appropriately.
Operation panel
E.OA
indication
Name
Acceleration error
Stops the output when the acceleration rate of the motor rotation speed has exceeded the setting of Pr.375 Faulty
Description
acceleration rate detection level.
 Check for sudden load change.
Check point
 Check that Pr.375 Faulty acceleration rate detection level is appropriate.
 Check that the setting of the acceleration/deceleration rate is large.
 Reduce the load.
Corrective
 Set Pr.375 Faulty acceleration rate detection level appropriately.
 If the acceleration/deceleration rate is large and the error occurs even in normal operation, set Pr.375 ="9999
action
(detecting the error disabled)".
Operation panel
E.USB
indication
Name
USB communication fault
When communication has broken during the time set in Pr.548 USB communication check time interval, this function
Description
stops the drive unit output.
Check point
 Check the USB communication cable.
 Check the Pr.548 USB communication check time interval setting.
Corrective
 Check the USB communication cable.
action
 Increase the Pr.548 USB communication check time interval setting. Or, change the setting to 9999.
278
FR-PU07 E.OS
FR-PU07 E.OSd
FR-PU07 E.Od
FR-PU07 Fault
FR-PU07 USB comm error