239
5
TROUBLESHOOTING
Causes and corrective actions
(2) Warning
When a warning occurs, the output is not shut off.
Operation panel
indication
Err.
Name
Drive unit 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-PU07 OL
Name
Stall prevention (overcurrent)
Description
During
acceleration
When the output current of the drive unit exceeds the stall prevention operation level (Pr. 22 Stall
prevention operation level, etc.), this function stops the increase in speed until the overload current
decreases to prevent the drive unit from resulting in overcurrent trip. When the overload current has
reduced below stall prevention operation level, this function increases the speed again.
During
constant-
speed
operation
When the output current of the drive unit exceeds the stall prevention operation level (Pr. 22 Stall
prevention operation level, etc.), this function reduces speed until the overload current decreases to
prevent the drive unit from resulting in overcurrent trip. When the overload current has reduced below
stall prevention operation level, this function increases the speed up to the set value.
During
deceleration
When the output current of the drive unit exceeds the stall prevention operation level (Pr. 22 Stall
prevention operation level, etc.), this function stops the decrease in speed until the overload current
decreases to prevent the drive unit from resulting in overcurrent trip. When the overload current has
decreased below stall prevention operation level, this function decreases the speed again.
Check point
Check that the Pr. 7 Acceleration time and Pr. 8 Deceleration time settings are not too small.
Check that the load is not too heavy.
Are there any failure in peripheral devices?
Check that the Pr. 22 Stall prevention operation level is appropriate
Check if the operation was performed without connecting a motor.
Corrective action
Set a larger value in Pr. 7 Acceleration time and Pr. 8 Deceleration time. (Refer to page 87)
Reduce the load weight.
Check the peripheral devices.
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.)
Check the connection of the PM motor.
Operation panel
indication
oL
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 speed 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.
(Refer to page 211).
Check point
Check for sudden speed reduction.
Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886) is used. (Refer to page 211).
Corrective action
Increase the deceleration time using Pr. 8 Deceleration time.
