153
Causes and corrective actions
Operation Panel
Indication
E.EP
FR-PU04
Fault 14
FR-PU07
E.EP
Name
Encoder phase error
Description
Stops the inverter output when the rotation command of the inverter differs from the actual motor
rotation direction detected from the encoder.
This protective function does not function in the initial status.
Check point
· Check for mis-wiring of the encoder cable.
· Check for wrong setting of
Pr. 359 Encoder rotation direction
.
Corrective action
· Perform connection and wiring securely.
· Change the
Pr. 359 Encoder rotation direction
value.
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
Stops the inverter output when the output current exceeds the setting of
Pr. 150
Output current detection
level
. Functions when
Pr. 167 Output current detection operation selection
is set to "1".
When the initial value (
Pr. 167
= "0") is set, this protective function does not function.
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 chapter 4 of
the instruction manual (applied).)
Operation Panel
Indication
E.IOH
FR-PU04
Fault 14
FR-PU07
Inrush overheat
Name
Inrush current limit circuit fault
Description
Stops the inverter output when the resistor of inrush current limit circuit overheated. The inrush current
limit circuit failure
Check point
· Check that frequent power ON/OFF is not repeated.
· 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.
Summary of Contents for FR-A741-11K
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