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Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual Page 293

Fr-e700 series.
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Operation panel
Er4
indication
Name
Mode designation error
Appears if a parameter setting is attempted in the External or NET operation mode with Pr. 77 ≠ "2".
Description
Appears if a parameter setting is attempted when the command source is not at the operation panel.
Check that operation mode is PU operation mode.
Check the Pr. 77 setting. (Refer to page 187).
Check point
Check if FR Configurator (USB connector) or a parameter unit (FR-PU04/FR-PU07) is connected when Pr. 551 =
"9999 (initial setting)."
Check the Pr.551 setting.
After setting the operation mode to the "PU operation mode", make parameter setting. (Refer to page 194)
After setting Pr. 77 = "2", make parameter setting.
Corrective action
Disconnect FR Configurator (USB connector) or the parameter unit (FR-PU04/FR-PU07), and make parameter
setting.
After setting Pr. 551 = "4", make parameter setting. (Refer to page 205)
Operation panel
Err.
indication
Name
Inverter reset
Executing reset using RES signal, or reset command from communication or PU
Description
Displays at powering OFF.
Corrective action
Turn OFF the reset command
(2) Warnings
When a warning occurs, the output is not shut off.
Operation panel
OL
indication
Name
Stall prevention (overcurrent)
During
acceleration
During
constant-
Description
speed
operation
During
deceleration
Check that the Pr. 0 Torque boost setting is not too large.
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.
Check point
Are there any failure in peripheral devices?
Check that the Pr. 13 Starting frequency is not too large.
Check that the Pr. 22 Stall prevention operation level is appropriate
Increase or decrease the Pr. 0 Torque boost setting 1% by 1% and check the motor status. (Refer to page 85)
Set a larger value in Pr. 7 Acceleration time and Pr. 8 Deceleration time. (Refer to page 109)
Reduce the load weight.
Try Advanced magnetic flux vector control and General-purpose magnetic flux vector control.
Corrective action
Change the Pr. 14 Load pattern selection setting.
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.)
FR-PU04
FR-PU07
When the output current (output torque when Pr. 277 Stall prevention current switchover = "1") 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.
When the output current (output torque when Pr. 277 Stall prevention current switchover = "1") 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.
When the output current (output torque when Pr. 277 Stall prevention current switchover = "1") 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.
Causes and corrective actions
OL
5
293

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