Mitsubishi FR-A740-00023-EC, Инструкция по эксплуатации

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405
Causes and corrective actions
5
P
R
OTECTIVE
FUNC
TI
ONS
Operation Panel
Indication
E.P24
FR-PU04
FR-PU07
E.P24
Name
24VDC power output short circuit
Description
When the 24VDC power output from the PC terminal is shorted, this function shuts off the power output.
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
Indication
E.CDO
FR-PU04 Fault 14
FR-PU07 OC detect level
Name Output current detection value exceeded
Description
This function is activated when the output current exceeds the Pr. 150 Output current detection level
setting.
Check point
Check the settings of Pr. 150 Output current detection level , Pr. 151 Output current detection signal delay time ,
Pr. 166 Output current detection signal retention time , Pr. 167 Output current detection operation selection .
(Refer to page 239.)
Operation Panel
Indication
E.IOH
FR-PU04 Fault 14
FR-PU07 Inrush overheat
Name Inrush current limit circuit alarm
Description
This function is activated when the resistor of the inrush current limit circuit overheats. The inrush
current limit circuit failure
Check point
· Check that frequent power ON/OFF is not repeated.
· Check that the primary side fuse (5A) in the power supply circuit of the inrush current limit circuit
contactor (FR-A740-03250 or more) is not fused.
· Check that the power supply circuit of inrush current limit circuit contactor is not damaged.
Corrective action
Configure a circuit where frequent power ON/OFF is not repeated.
If the problem still persists after taking the above measure, please contact your sales representative.
Operation Panel
Indication
E.SER
FR-PU04 Fault 14
FR-PU07 VFD Comm error
Name
Communication error (inverter)
Description
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
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.
Operation Panel
Indication
E.AIE
FR-PU04 Fault 14
FR-PU07 Analog in error
Name
Analog input error
Description
Appears when 30mA or more is input or a voltage (7.5V or more) is input with the terminal 2/4 set to
current input.
Check point
Check the setting of Pr. 73 Analog input selection , Pr. 267 Terminal 4 input selection and voltage/current
input switch.
(Refer to page 275.)
Corrective action
Either give a frequency command by current input or set Pr. 73 Analog input selection , Pr. 267 Terminal 4
input selection
, and voltage/current input switch to voltage input.
Operation Panel
Indication
E.USB
FR-PU04 Fault 14
FR-PU07 USB comm error
Name
USB communication error
Description
When the time set in
Pr. 548 USB communication check time interval
has broken, this function stops the
inverter output.
Check point
Check the USB communication cable.
Corrective action
· Check the Pr. 548 USB communication check time interval setting.
· Check the USB communication cable.
· Increase the
Pr. 548 USB communication check time interval setting. Or, change the setting to 9999.
(Refer to page 347)