Mitsubishi Electric FR-F700 Series Instruction Manual page 71

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
(3) Minor fault
When the protective function is activated, the output is not shut off. You can also output a minor fault signal by
making parameter setting. (Set "98" in any of Pr. 190 to Pr. 196 (output terminal function selection). (Refer to the
Instruction Manual (applied).))
Operation Panel
Indication
Name
Description
Check point
Corrective action
66
RB
Regenerative brake prealarm
Appears if the regenerative brake duty reaches or exceeds 85% of the Pr. 70 Special regenerative
brake duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage
(E. OV_) occurs.
Appears only for the FR-F740-01800 or more.
• Check that the brake resistor duty is not high.
• Check that the Pr. 30 Regenerative function selection and Pr. 70 Special regenerative brake duty values
are correct.
• Increase the deceleration time.
• Check the Pr. 30 Regenerative function selection and Pr. 70 Special regenerative brake duty values.
TH
Electronic thermal relay function prealarm
Appears if the integrating value of the Pr. 9 Electronic thermal O/L relay reaches or exceeds 85% of
the preset level. If it reaches 100% of the Pr. 9 Electronic thermal O/L relay setting, a motor overload
shut-off (E. THM) occurs.
1. Check for large load or sudden acceleration.
2. Is the Pr. 9 Electronic thermal O/L relay setting is appropriate? (Refer to page 32.)
1. Reduce the load weight or the number of operation times.
2. Set an appropriate value in Pr. 9 Electronic thermal O/L relay. (Refer to page 32.)
MT
Maintenance signal output
Indicates that the cumulative energization time of the inverter has reached a given time.
The Pr. 503 Maintenance timer setting is larger than the Pr. 504 Maintenance timer alarm output set time
setting. (Refer to the Instruction Manual (applied).)
Setting "0" in Pr. 503 Maintenance timer erraces the signal.
CP
Parameter copy
Appears when parameters are copied between models with capacities of FR-F720-02330 (FR-
F740-01160) or less and FR-F740-01800 or more.
Resetting of Pr.9, Pr.30, Pr.51, Pr.52, Pr.54, Pr.56, Pr.57, Pr.61, Pr.70, Pr.72, Pr.80, Pr.90, Pr.158, Pr.190 to
Pr.196, and Pr.893 is necessary.
Set the initial value in Pr. 989 Parameter copy alarm release.
FN
Fan fault
For the inverter that contains a cooling fan,
fan stops due to a fault or different operation from the setting of Pr. 244 Cooling fan operation
selection.
Check the cooling fan for a fault.
Check for fan fault. Please contact your sales representative.
FR-PU04 RB
FR-PU04 TH
FR-PU04 ————
FR-PU04 ————
FR-PU04 FN
appears on the operation panel when the cooling