Mitsubishi Electric F700 Instruction Manual page 103

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
*4 Functions only when any of Pr. 178 to Pr. 189 (input terminal function selection) is set to OH.
Operation Panel
Indication
Name
Description
Check point
Corrective action
98
E.ILF
Input phase failure
This alarm is output when function valid setting (=1) is set in Pr. 872 Input phase failure protection selection and
one phase of the three phase power input opens. (Refer to
Check for a break in the cable for the three-phase power supply input.
· Wire the cables properly.
· Repair a brake portion in the cable.
· Check the Pr. 872 Input phase failure protection selection setting.
E.OLT
Stall prevention
If the frequency has fallen to 0.5Hz by stall prevention operation and remains for 3s, an alarm (E.OLT)
appears to shutoff the inverter output. OL appears while stall prevention is being activated.
· Check the motor for use under overload. (Refer to
· Reduce the load weight.
E.GF
Output side earth fault overcurrent
This function stops the inverter output if an earth fault overcurrent flows due to an earth fault that
occurred on the inverter's output (load) side.
Check for an earth fault in the motor and connection cable.
Remedy the earth fault portion.
E.LF
Output phase failure
This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side
(load side) opens.
· 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.
· Wire the cables properly.
· Check the Pr. 251 Output phase failure protection selection setting.
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.
· 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.
E.PTC
PTC thermistor operation
Appears when the motor overheat status is detected for 10s or more by the external PTC thermistor
input connected to the terminal AU.
· Check the connection between the PTC thermistor switch and thermal relay protector.
· Check the motor for operation under overload.
· Is valid setting ( = 63) selected in Pr. 184 AU terminal function selection ? (Refer to
Manual (applied).)
Reduce the load weight.
FR-PU04 Fault 14
FR-PU07 Input phase loss
FR-PU04
Stll Prev STP ( OL shown during stall
prevention operation)
FR-PU07
Instruction Manual (applied).)
FR-PU04
Ground Fault
FR-PU07

FR-PU04
FR-PU07 E. LF
FR-PU04 OH Fault
*4
FR-PU04 Fault 14
FR-PU07 PTC activated
Instruction Manual (applied).)
Instruction