65
Causes and corrective actions
5
TROUB
L
E
S
HOOTING
(2) Warnings
When the protective function is activated, the output is not shut off.
Operation Panel
Indication
OL
FR-PU04
OL
Name
Stall prevention (overcurrent)
Description
During
acceleration
If a current of more than 110%
*1
of the rated inverter current flows in the motor, this
function stops the increase in frequency until the overload current reduces to
prevent the inverter from resulting in overcurrent shut-off.
When the overload current has reduced below 110%
*1
, this function increases the
frequency again.
During
constant-
speed
operation
If a current of more than 110%
*1
of the rated inverter current flows in the motor, this
function lowers the frequency until the overload current reduces to prevent
overcurrent shut-off. When the overload current has reduced below 110%
*1
, this
function increases the frequency up to the set value.
During
deceleration
If a current of more than 110%
*1
of the rated inverter current flows in the motor, this
function stops the decrease in frequency until the overload current reduces to
prevent the inverter from resulting in overcurrent shut-off.
When the overload current has reduced below 110%
*1
, this function decreases the
frequency again.
Check point
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.
Corrective action
1. Increase or decrease the
Pr. 0 Torque boost
value 1% by 1% and check the motor status.
(Refer to page 52.)
2. Set a larger value in
Pr. 7 Acceleration time
and
Pr. 8 Deceleration time
.
(Refer to page 54.)
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.)
*1
120% when LD is selected
Operation Panel
Indication
oL
FR-PU04
oL
Name
Stall prevention (overvoltage)
Description
During
deceleration
· 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 reduced, deceleration resumes.
· 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 the Instruction Manual (applied).)
Check point
· Check for sudden speed reduction.
· Regeneration avoidance function
(Pr. 882 to Pr. 886)
is being used?
(Refer to the Instruction Manual
(applied).)
Corrective action
The deceleration time may change.
Increase the deceleration time using
Pr. 8 Deceleration time
.
Operation Panel
Indication
PS
FR-PU04
PS
Name
PU Stop
Description
Stop with
of the PU is set in
Pr. 75 Reset selection/disconnected PU detection/PU stop selection
.
(For
Pr. 75
, refer to
the Instruction Manual (applied)
.)
Check point
Check for a stop made by pressing
of the operation panel.
Corrective action
Turn the start signal off and release with
.
Содержание FR-F700 Series
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