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Mitsubishi Electric FR-F720P-0.75K Instruction Manual Page 133

Fr-f700p series.
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Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
126
E.OLT
Stall prevention stop
If the frequency has fallen to 0.5Hz(1.5Hz under IPM motor control) 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.
· Check the motor for use under overload. (
· Check that a motor is connected during IPM motor control. (IPM motor control)
· Reduce the load weight.
· Check the connection of the IPM motor. (IPM motor control)
· Set the IPM motor test operation. (
E.SOT
IPM
IPM
IPM
Loss of synchronism detection
Stops the output when the operation is not synchronized. (This function is only available under IPM
motor control.)
· Check that the IPM motor is not driven overloaded.
· Check if a start command is given to the inverter while the IPM motor is coasting.
· Check if a motor other than the IPM motor (MM-EFS series or MM-EF series) is driven.
· Set the acceleration time longer.
· Reduce the load.
· If the inverter restarts during coasting, set Pr.57 Restart coasting time ≠ "9999," and select the
automatic restart after instantaneous power failure.
· Drive the IPM motor (MM-EFS series or MM-EF series).
E.GF
Output side earth (ground) fault overcurrent
This function stops the inverter output if an earth (ground) fault overcurrent flows due to an earth
(ground) fault that occurred on the inverter's output (load) side.
Check for an earth (ground) fault in the motor and connection cable.
Remedy the earth (ground) fault portion.
E.LF
Output phase loss
This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side
(load side) is lost.
· Check the wiring (Check that the motor is normal.)
· Check that the capacity of the motor used is not smaller than that of the inverter.
· Check if a start command is given to the inverter while the motor is coasting.
· Wire the cables properly.
· Choose inverter and motor capacities that match.
· Input a start command after the motor stops. Alternatively, use automatic restart after instantaneous
power failure/flying start function. (
E.OHT
External thermal relay operation
If the external thermal relay provided for motor overheat protection, or the internally mounted
temperature relay in the motor, etc. switches ON (contacts open), the inverter output is stopped.
This function is available when "7" (OH signal) is set to any of Pr. 178 to Pr. 189 (input terminal function
selection).
When the initial value (without OH signal assigned) is set, this protective function is not available.
· Check for motor overheating.
· Check that the value of 7 (OH signal) is set correctly in any of Pr. 178 to Pr. 189 (input terminal function
selection).
· Reduce the load and operating duty.
· Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
FR-PU04
Stll Prev STP
FR-PU07
Refer to Chapter 4 of the Instruction Manual (Applied).)
Refer to Chapter 4 of the Instruction Manual (Applied))
FR-PU04
Fault 14
Motor step out
FR-PU07
FR-PU04
Ground Fault
FR-PU07
FR-PU04
E. LF
FR-PU07
Refer to Chapter 4 of the Instruction Manual (Applied)
FR-PU04
OH Fault
FR-PU07

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