Mitsubishi Electric F700, Instruction Manual

Page: 289 / 341

280
Causes and corrective actions
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 fault portion.
Operation Panel
Indication
E.CDO
FR-PU04 Fault 14
FR-PU07 OC detect level
Name
Output current detection value exceeded
Description
This functions 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 .
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 point
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
retention time , Pr. 167 Output current detection operation selection . (Refer to page 121.)
Operation Panel
Indication
E.IOH
FR-PU04 Fault 14
FR-PU07 Inrush overheat
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 point
· Check that frequent power ON/OFF is not repeated.
· Check that no meltdown is found in the primary side fuse (5A) in the power supply circuit of the
inrush current suppression circuit contactor (FR-F740-03250 or more) 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.
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 fault (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 fault
Description
Trips 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 and Pr. 267 Terminal 4 input selection . (Refer to page
155.)
Corrective action
Either give a frequency command by current input or set Pr. 73 Analog input selection or Pr. 267 Terminal
4 input selection to voltage input.
Operation Panel
Indication
E.PID
FR-PU04 Fault 14
FR-PU07 Fault
Name PID signal fault
Description
If any of PID upper limit (FUP), PID lower limit (FDN), and PID deviation limit (Y48) turns ON during PID
control, inverter shuts off the output. This function is active under the following parameter settings:
Pr.554 PID
signal operation selection
z
"0,10", Pr.131 PID upper limit
z
"9999", Pr.132 PID lower limit
z
"9999", and Pr.553 PID
deviation limit
z
"9999". This protective function is not active in the initial setting ( Pr.554 = "0", Pr.131 = "9999",
Pr.132 = "9999", Pr.553 = "9999").
Check Point
Check if the measured PID value is greater than the upper limit (Pr.131) or smaller than the lower limit (Pr.132) .
Check if the absolute PID deviation value is greater than the limit value (Pr.553) .
Corrective Action
Make correct settings for
Pr.131 PID upper limit
,
Pr.132 PID lower limit
,
Pr.553 PID deviation limit
. (Refer to page
219
)