Mitsubishi Electric FR-A820-00046 (0.4K), Инструкция по эксплуатации

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Protective functions Causes and corrective actions
FR-A800 6 - 15
Operation panel
indication
oL FR-LU-08 oL
Name Stall prevention (overvoltage)
Description
앫
When the output voltage of the inverter increases, the stall prevention (overvoltage)
function activates.
앫
The regeneration avoidance function activates due to excessive regenerative power of the
motor. (Refer to page 5-723.)
앫
The following section explains the stall prevention (overvoltage) function.
During deceleration
If the regenerative power of the motor becomes excessive to exceed the
regenerative power consumption capability, this function stops
decreasing the frequency to prevent overvoltage trip. As soon as the
regenerative power has reduced, deceleration resumes.
Check point
앫
Check for sudden speed reduction.
앫
Check if the regeneration avoidance function (Pr. 882 to Pr. 886) is being used.
(Refer to page 5-723.)
Corrective action
The deceleration time may change. Increase the deceleration time using Pr. 8 "Deceleration
time".
Operation panel
indication
RB FR-LU-08 RB
Name Regenerative brake pre-alarm (Standard models only)
Description
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
첸
) occurs.
Check point
앫
Check if the brake resistor duty is not too high.
앫
Check that the Pr. 30 "Regenerative function selection" and Pr. 70 settings are correct.
Corrective action
앫
Set the deceleration time longer.
앫
Check the Pr. 30 and Pr. 70 settings. (Refer to page 5-713.)
Operation panel
indication
TH FR-LU-08 TH
Name Electronic thermal relay function pre-alarm
Description
Appears if the cumulative value of the electronic thermal O/L relay reaches or exceeds 85% of
the preset level of Pr. 9 "Electronic thermal O/L relay". If the value reaches 100% of Pr. 9 setting,
motor overload trip (E.THM) occurs.
Check point
앫
Check for large load or sudden acceleration.
앫
Check that the Pr. 9 setting is appropriate. (Refer to page 5-303.)
Corrective action
앫
Reduce the load and frequency of operation.
앫
Set an appropriate value in Pr. 9. (Refer to page 5-303.)
Operation panel
indication
PS FR-LU-08 PS
Name PU stop
Description
앫
The motor is stopped using STOP/RESET key under the mode other than the PU operation
mode. (To enable STOP/RESET key under the mode other than the PU operation mode, set
Pr. 75 "Reset selection/disconnected PU detection/PU stop selection". Refer to page 5-200
for details.)
앫
The motor is stopped by the emergency stop function.
Check point
앫
Check for a stop made by pressing STOP/RESET key of the operation panel.
앫
Check for whether the X92 signal is OFF.
Corrective action
앫
Turn the start signal OFF and release with PU/EXT key.
앫
Turn ON the X92 signal and OFF the start signal for release.