Mitsubishi Electric FR-E720-0.1K(SC) Instruction Manual page 345

FR-E700 Series
Instruction Manual Supplement
For the FR-E700 series manufactured in December 2014 or later, the
following specifications are added. Check the serial number printed
on the rating plate of the inverter.
(1) Voltage reduction selection during stall prevention operation (Pr.154)
Parameter
Number
Voltage reduction
154 selection during stall
prevention operation
Set Pr.154 = "11" when the overvoltage protective function (E.OV
during stall prevention operation in an application with large load inertia. Note that
turning OFF the start signal (STF/STR) or varying the frequency command during
stall prevention operation may delay the acceleration/deceleration start.
(2) Causes and corrective actions
Operation
panel
indication
Name
Regenerative overvoltage trip during acceleration
If regenerative energy causes the inverter's internal main circuit DC voltage to
reach or exceed the specified value, the protective circuit is activated and the
Description
inverter trips. The circuit may also be activated by a surge voltage produced in
the power supply system.
 Check for too slow acceleration. (e.g. during downward acceleration in
Check point
 Check that the setting of Pr. 22 Stall prevention operation level is not too small.
 Check if the stall prevention operation is frequently activated in an
 Decrease the acceleration time.
 Check that regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886)
Corrective
action
 Set the Pr.22 Stall prevention operation level correctly.
 Set Pr.154 Voltage reduction selection during stall prevention operation = "11".
Name
E.OV1
vertical lift load)
application with a large load inertia.
is used.
Initial Setting
Value Range
1
1
11
FR-PU04
FR-PU07
1/4
Description
Does not suppress the
overvoltage protective
function
Suppresses the
overvoltage protective
function

) is activated
OV During Acc
BCN-C22005-679