247
Causes and corrective actions
(2) Warnings
When a warning occurs, the output is not shut off.
Operation panel
indication
Err.
Name
Inverter reset
Description
Executing reset using RES signal, or reset command from communication or PU
Displays at powering off.
Corrective action
Turn off the reset command
Operation panel
indication
OL
FR-PU04
FR-PU07
OL
Name
Stall prevention (overcurrent)
Description
During
acceleration
When the output current of the inverter exceeds the stall prevention operation level (
Pr. 22 Stall
prevention operation level
, etc.), this function stops the increase in frequency until the overload current
decreases to prevent the inverter from resulting in overcurrent trip. When the overload current has
reduced below stall prevention operation level, this function increases the frequency again.
During
constant-
speed
operation
When the output current of the inverter exceeds the stall prevention operation level (
Pr. 22 Stall
prevention operation level
, etc.), this function reduces frequency until the overload current decreases to
prevent the inverter from resulting in overcurrent trip. When the overload current has reduced below
stall prevention operation level, this function increases the frequency up to the set value.
During
deceleration
When the output current of the inverter exceeds the stall prevention operation level (
Pr. 22 Stall
prevention operation level
, etc.), this function stops the decrease in frequency until the overload current
decreases to prevent the inverter from resulting in overcurrent trip. When the overload current has
decreased below stall prevention operation level, 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.
6. Check that the
Pr. 22 Stall prevention operation level
is appropriate
Corrective action
1. Increase or decrease the
Pr. 0 Torque boost
setting 1% by 1% and check the motor status.
2. Set a larger value in
Pr. 7 Acceleration time
and
Pr. 8 Deceleration time
.
3. Reduce the load weight.
4. Try general-purpose magnetic flux vector control.
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 150%.) 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
. (Operation at OL
occurrence can be selected using
Pr. 156
.)
Operation panel
indication
oL
FR-PU04
FR-PU07
oL
Name
Stall prevention (overvoltage)
Description
During
deceleration
If the regenerative energy of the motor becomes excessive to exceed the regenerative energy
consumption capability, this function stops the decrease in frequency to prevent overvoltage trip.
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 trip.
Check point
Check for sudden speed reduction.
Check that regeneration avoidance function
(Pr. 882, Pr. 883, Pr. 885, Pr. 886)
is used.
Corrective action
The deceleration time may change. Increase the deceleration time using
Pr. 8 Deceleration time
.
Summary of Contents for FR-D700 Series
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