Mitsubishi Electric FR-D720-0.1K Instruction Manual page 309

FR-D700 Series
Instruction Manual Supplement
For the FR-D700 series manufactured in March 2014 or later, the following specifications are
added. Check the serial number printed on the rating plate or on package of the inverter. (For how
to find the SERIAL number, refer to page 2.)
●Voltage reduction selection during stall prevention operation (Pr.154)
Pr.154 Voltage reduction selection during stall prevention operation is added
Parameter
Number
154
(1)To further prevent a trip (Pr.154)
Set Pr.154 = "11" when the overvoltage protective function (E.OV) activates during stall prevention
operation in an application with large load inertia. Note that turning OFF the start signal (STF/STR)
or varying the frequency signal during stall prevention operation may delay the acceleration/
deceleration start.
(2)Causes and corrective actions
Operation panel
indication
Name
Description
Check point
Corrective action
Name
Voltage reduction selection
during stall prevention
operation

E.OV1
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 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 vertical lift load)
 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 application
with a large load inertia.
 Decrease the acceleration time.
 Use regeneration avoidance function (Pr. 882, Pr. 883, Pr. 885, Pr. 886). (
Chapter 4 of the Instruction Manual (Applied).)
 Set the Pr.22 Stall prevention operation level correctly.
 Set Pr.154 Voltage reduction selection during stall prevention operation = "11".
Initial Setting
Value Range
1
FR-PU04
FR-PU07
1/4
.
Description
Does not suppress the
1 overvoltage protective
function
Suppresses the
11 overvoltage protective
function
OV During Acc
BCN-C22005-689
Refer to