Mitsubishi Electric 800 Series Instruction Manual page 634

Abbreviation RB
Name
Regenerative brake pre-alarm (Standard models only)
Appears if the regenerative brake duty reaches or exceeds 85% of the Pr.70 Special regenerative brake
Description
duty value. If the regenerative brake duty reaches 100%, a regenerative overvoltage (E. OV[ ]) occurs.
• Check if the brake resistor duty is not too high.
Check point
• Check that the Pr.30 Regenerative function selection and Pr.70 settings are correct.
• Set the deceleration time longer.
Corrective action
• Check the Pr.30 and Pr.70 settings. (Refer to
Abbreviation TH
Name
Electronic thermal relay function pre-alarm
Appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of the preset
Description
level of Pr.9 Electronic thermal O/L relay. If the specified value is reached, the protection circuit is activated
to shut off the inverter output.
• Check for large load or sudden acceleration.
Check point
• Check that the Pr.9 setting is appropriate. (Refer to
• Reduce the load and frequency of operation.
Corrective action
• Set an appropriate value in Pr.9. (Refer to
Abbreviation PS
Name
PU stop
• The motor is stopped using
Description
under the mode other than the PU operation mode, set Pr.75 Reset selection/disconnected PU
detection/PU stop selection. Refer to
• The motor is stopped by the emergency stop function.
• Check for a stop made by pressing
Check point
• Check for whether the X92 signal is OFF.
• Turn the start signal OFF and release with
Corrective action
• Turn ON the X92 signal and OFF the start signal for release.
Abbreviation SL
Name
Speed limit indication
Description
Output if the speed limit level is exceeded during torque control.
• Check that the torque command is not larger than required.
Check point
• Check if the speed limit level is set too low.
• Decrease the torque command value.
Corrective action
• Increase the speed limit level.
Abbreviation CP
Name
Parameter copy
Appears when parameter copy is performed between inverters FR-A860-01080 or lower, FR-A860-01440 or
Description
higher
Resetting of Pr.9, Pr.30, Pr.51, Pr.56, Pr.57, Pr.61, Pr.70, Pr.72, Pr.80, Pr.82, Pr.90 to Pr.94, Pr.453, Pr.455,
Check point
Pr.458 to Pr.462, Pr.557, Pr.859, Pr.860 and Pr.893 is necessary.
Corrective action
Set the initial value in Pr.989 Parameter copy alarm release.
Abbreviation SA
Name
SA
Description
Appears when the shorting wire across the terminals S1 and PC or the terminals S2 and PC is disconnected.
Check point
• Check if the shorting wire across the terminals S1 and PC or the terminals S2 and PC is disconnected.
Corrective action
• Short across the terminals S1 and PC and the terminals S2 and PC with shortening wires.
Causes and corrective actions
FR-LU08
RB
FR-PU07
page 608.)
FR-LU08
TH
FR-PU07
page 317.)
page 317.)
FR-LU08
PS
FR-PU07
under the mode other than the PU operation mode. (To enable
page 244 for details.)
of the operation panel.
.
FR-LU08
SL
FR-PU07
FR-LU08
CP
FR-PU07
FR-LU08 SA
FR-PU07 —
PROTECTIVE FUNCTIONS
6
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