Mitsubishi Electric FR-A700 Instruction Manual page 727

Troubleshooting
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
FR-A700 EC
PS
PU Stop
Stop with the STOP/RESET key of the PU is set in Pr. 75 "Reset selection/disconnected
PU detection/PU stop selection". (For Pr. 75, refer to section 6.21.1.)
Check for a stop made by pressing the STOP/RESET key of the operation panel.
Turn the start signal off and release with PU/EXT key.
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 regenera-
tive overvoltage (E. OV_) occurs.The RBP signal can be simultaneously output with the
[RB] display. For the terminal used for the RBP signal output, assign the function by setting
"7" (positive logic) or "107" (negative logic) in any of Pr. 190 to Pr. 196 (output terminal
function selection). (see also section 6.14.5)
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 (Pr. 8).
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.
The THP signal can be simultaneously output with the [TH] display. For the terminal used for the
THP signal output, assign the function by setting "8" (source logic) or "108" (sink logic) in any of
Pr. 190 to Pr. 196 "Output terminal function selection". (Refer to section 6.14.5.)
1) Check for large load or sudden acceleration.
2) Is the Pr. 9 "Electronic thermal O/L relay" setting is appropriate? (Refer to section
6.12.1.)
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 section 6.12.1.)
MT
Maintenance signal output
Indicates that the cumulative energizing 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 section 6.25.3.)
Setting "0" in Pr. 503 "Maintenance timer" erases the signal.
Causes and corrective actions
FR-PU04
PS
FR-PU07
FR-PU04
RB
FR-PU07
FR-PU04
TH
FR-PU07
FR-PU04 —
FR-PU07 MT
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