Mitsubishi Electric FR-F720P-0.75K Instruction Manual page 136

Operation Panel
E.CTE
Indication
Name
Operation panel power supply short circuit, RS-485 terminal power supply short circuit
When the operation panel power supply (PU connector) is shorted, this function shuts off the power
output and stops the inverter output. At this time, the operation panel (parameter unit) cannot be used
and RS-485 communication from the PU connector cannot be made. When the internal power supply
Description
for RS-485 terminals are shorted, this function shuts off the power output.
At this time, communication from the RS-485 terminals cannot be made.
To reset, enter the RES signal or switch power OFF, then ON again.
· Check for a short circuit in the PU connector cable.
Check point
· Check that the RS-485 terminals are connected correctly.
· Check the PU and cable.
Corrective action
· Check the connection of the RS-485 terminals
Operation Panel
E.P24
Indication
Name
24VDC power output short circuit
When the 24VDC power output from the PC terminal is shorted, this function shuts off the power output.
Description At this time, all external contact inputs switch OFF. The inverter cannot be reset by entering the RES
signal. To reset it, use the operation panel or switch power OFF, then ON again.
Check point · Check for a short circuit in the PC terminal output.
Corrective action · Remedy the earth (ground) fault portion.
Operation Panel
E.CDO
Indication
Name
Output current detection value exceeded
This function stops the inverter output when the output current exceeds the setting of Pr.150 Output
current detection level, or the output current falls below the setting of Pr.152 Zero current detection level.
Description
This function is active when Pr. 167 Output current detection operation selection is set to "1, 10, 11".
When the initial value (Pr. 167 = "0") is set, this fault does not occur.
Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay time,
Pr. 152 Zero current detection level, Pr. 153 Zero current detection time, Pr. 166 Output current detection signal
Check point
retention time, Pr. 167 Output current detection operation selection. (
Manual (Applied).)
Operation Panel
E.IOH
Indication
Name
Inrush current limit circuit fault
Description Trips when the resistor of the inrush current limit circuit overheats. The inrush current limit circuit fault
· Check that frequent power ON/OFF is not repeated.
· Check that no meltdown is found in the input side fuse (5A) in the power supply circuit of the inrush
Check point
current suppression circuit contactor (FR-F740P-132K or higher) or no fault is found in the power
supply circuit of the contactor.
· Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Configure a circuit where frequent power ON/OFF is not repeated.
Corrective action
If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
E.SER
Indication
Name
Communication fault (inverter)
This function stops the inverter output when communication error occurs consecutively for more than
permissible retry count when a value other than "9999" is set in Pr. 335 RS-485 communication retry count
Description
during RS-485 communication from the RS-485 terminals. This function also stops the inverter output if
communication is broken for the period of time set in Pr. 336 RS-485 communication check time interval.
Check point
Check the RS-485 terminal wiring.
Corrective action
Perform wiring of the RS-485 terminals properly.
Causes and corrective actions
FR-PU04 ————
FR-PU07 E.CTE
FR-PU04
E.P24
FR-PU07
FR-PU04 Fault 14
FR-PU07 OC detect level
Refer to Chapter 4 of the Instruction
FR-PU04 Fault 14
FR-PU07 Inrush overheat
FR-PU04 Fault 14
FR-PU07 VFD Comm error
6
129