Mitsubishi Electric FR-A720-0.4K Instruction Manual page 154

Operation Panel
E.LF
Indication
Name Output phase loss
This function stops the inverter output if one of the three phases (U, V, W) on the inverter's output side
Description
(load side) is lost.
· Check the wiring (Check that the motor is normal.)
Check point
· Check that the capacity of the motor used is not smaller than that of the inverter.
· Wire the cables properly.
Corrective action
· Choose inverter and motor capacities that match.
Operation Panel
E.OHT
Indication
Name
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.
Description
This function is available when "7" (OH signal) is set in 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 point
· 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.
Corrective action
· Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
Operation Panel
E.PTC
Indication
Name
PTC thermistor operation
Stops the inverter output when the motor overheat status is detected for 10s or more by the external
PTC thermistor input connected to the terminal AU.
Description
This fault is available when "63" is set in Pr. 184 AU terminal function selection and AU/PTC switchover
switch is set in PTC side. When the initial value (Pr. 184 = "4") is set, this protective function is not
available.
· Check the connection between the PTC thermistor switch and thermal protector.
· Check the motor for operation under overload.
Check point
· Is valid setting ( = 63) selected in Pr. 184 AU terminal function selection ? (Refer to Chapter 4 of
Instruction Manual (Applied).)
Corrective action
Reduce the load weight.
Operation Panel
E.OPT
Indication
Name
Option fault
· Appears when the AC power supply is connected to the terminal R/L1, S/L2, T/L3 accidentally when
a high power factor converter is connected.
· Appears when torque command by the plug-in option is selected using Pr. 804 Torque command source
Description
selection and no plug-in option is mounted.
· Appears when the switch for the manufacturer setting of the plug-in option is changed.
· Appears when a communication option is connected while Pr. 296 = "0 or 100."
· Check that the AC power supply is not connected to the terminal R/L1, S/L2, T/L3 when a high
power factor converter (FR-HC, MT-HC) or power regeneration common converter (FR-CV) is
Check point
connected.
· Check that the plug-in option for torque command setting is connected.
· Check for the password lock with a setting of Pr. 296 = "0, 100"
· Check the parameter (Pr. 30) setting and wiring.
· The inverter may be damaged if the AC power supply is connected to the terminal R/L1, S/L2, T/L3
when a high power factor converter is connected. Please contact your sales representative.
· Check for connection of the plug-in option. Check the Pr. 804 Torque command source selection setting.
Corrective action
· Return the switch for the manufacturer setting of the plug-in option to the initial status. (Refer to
instruction manual of each option)
· To apply the password lock when installing a communication option, set Pr.296 ≠ "0,100". (Refer to
Chapter 4 of
FR-PU04
FR-PU07
FR-PU04
FR-PU07
FR-PU04
FR-PU07
FR-PU04
FR-PU07
the Instruction Manual (Applied).)
Causes and corrective actions
E.LF
OH Fault
Fault 14
PTC activated
Option Fault
the
4
147