Mitsubishi Electric FR-A700 Instruction Manual page 734

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
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
Operation Panel
Indication
Name
Description
Check point
Corrective action
7 - 16
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 out-
put 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 protector.
Check the motor for operation under overload.
Is valid setting (= 63) selected in Pr. 184 "AU terminal function selection"?
Reduce the load weight. Reduce the load. You may also need to connect an additional
series resistor between terminals SD and AU.
E.OPT
Option alarm
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 selection" and no plug-in option is mounted.
Appears when the switch for the manufacturer setting of the plug-in option is changed.
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 regenerative common
converter (FR-CV) is connected.
Check that the plug-in option for torque command setting is connected.
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.
Return the switch for the manufacturer setting of the plug-in option to the initial status.
(Refer to instruction manual of each option.)
FR-PU04
OH Fault
FR-PU07
FR-PU04 Fault 14
FR-PU07 PTC activated
FR-PU04
Option Fault
FR-PU07
Troubleshooting