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Causes and corrective actions
(2) Warnings
When the protective function is activated, the output is not shut off.
Operation Panel
Indication
Name
Description
Check point
Corrective action
*1
120% when LD is selected
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
64
OL
Stall prevention (overcurrent)
If a current of more than 110%
function stops the increase in frequency until the overload current reduces to prevent
During
the inverter from resulting in overcurrent shut-off.
acceleration
When the overload current has reduced below 110%
frequency again.
During
If a current of more than 110%
constant-
function lowers the frequency until the overload current reduces to prevent overcurrent
shut-off. When the overload current has reduced below 110%
speed
the frequency up to the set value.
operation
If a current of more than 110%
function stops the decrease in frequency until the overload current reduces to prevent
During
the inverter from resulting in overcurrent shut-off.
deceleration
When the overload current has reduced below 110%
frequency again.
1. Check that the Pr. 0 Torque boost setting is not too large.
2. Check that the Pr. 7 Acceleration time and Pr. 8 Deceleration time settings are not too small.
3. Check that the load is not too heavy.
4. Are there any failure in peripheral devices?
5. Check that the Pr. 13 Starting frequency is not too large.
· Check the motor for use under overload.
1. Increase or decrease the Pr. 0 Torque boost value 1% by 1% and check the motor status. (Refer to page 50.)
2. Set a larger value in Pr. 7 Acceleration time and Pr. 8 Deceleration time. (Refer to page 53.)
3. Reduce the load weight.
4. Try simple magnetic flux vector control (Pr. 80).
5. Change the Pr. 14 Load pattern selection setting.
6. Set stall prevention operation current in Pr. 22 Stall prevention operation level. (The initial value is
110%.) The acceleration/deceleration time may change. Increase the stall prevention operation level
with Pr. 22 Stall prevention operation level, or disable stall prevention with Pr. 156 Stall prevention
operation selection. (Use Pr. 156 to set either operation continued or not at OL operation.)
oL
Stall prevention (overcurrent)
· If the regenerative energy of the motor becomes excessive and exceeds the
regenerative energy consumption capability, this function stops the decrease in
frequency to prevent overvoltage shut-off. As soon as the regenerative energy has
During
decreased, deceleration resumes.
deceleration
· If the regenerative energy of the motor becomes excessive when regeneration
avoidance function is selected (Pr. 882 = 1), this function increases the speed to
prevent overvoltage shut-off. (Refer to
· Check for sudden speed reduction.
· Regeneration avoidance function (Pr. 882 to Pr. 886) is being used? (Refer to
(applied).)
The deceleration time may change.
Increase the deceleration time using Pr. 8 Deceleration time.
PS
PU stop
Stop with
of the PU is set in Pr. 75 Reset selection/disconnected PU detection/PU stop selection. (For Pr.
75, refer to
Instruction Manual (applied).)
Check for a stop made by pressing
Turn the start signal off and release with
FR-PU04
OL
of the rated inverter current flows in the motor, this
*1
*1
of the rated inverter current flows in the motor, this
*1
of the rated inverter current flows in the motor, this
*1
*1
FR-PU04
oL
Instruction Manual (applied).)
FR-PU04
PS
of the operation panel.
.
, this function increases the
, this function increases
*1
, this function decreases the
Instruction Manual
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