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BCN-C22005-632
FR-F
700P Series
Instruction Manual Supplement
For the FR-F700P series manufactured in July 2012 or later, the following specifications are added or
modified. Check the serial number printed on the rating plate or on package of the inverter. (For how to
find the SERIAL number, refer to the Instruction Manual.)
1
Voltage reduction selection during stall prevention operation (Pr.154)
(1) To further prevent a trip (Pr. 154)   
<V/F><S MFVC>
 When  Pr. 154 is set to "0, 10", the output voltage reduces during stall prevention operation. By making this
setting to reduce the output voltage, an overcurrent trip can be less likely to occur. Use this function where a
torque decrease will not pose a problem.
Set 
Pr.154 = "10, 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
The setting values "10 and 11" are added for Pr.154 Voltage reduction selection during stall prevention operation.
Parameter 
Number
Name
Initial 
Value
Setting 
Range
Description
154
Voltage reduction selection 
during stall prevention 
operation
1
0
With voltage 
reduction
You can select whether to use 
output voltage reduction during 
stall prevention operation or not.
1
Without voltage 
reduction
10
With voltage 
reduction
Use these settings when the 
overvoltage protective function 
(E.OV) activates during stall 
prevention operation in an 
application with large load inertia.
11
Without voltage 
reduction
Operation Panel 
Indication
E.OV1
FR-PU04
FR-PU07
OV During Acc
Name
Regenerative overvoltage trip during acceleration
Description
If regenerative energy causes the inverter's internal main circuit DC voltage to reach or exceed the 
specified value, the protective circuit is activated to stop the inverter output. The circuit may also be 
activated by a surge voltage produced in the power supply system.
Check point
· Check for too slow acceleration. (e.g. during descending acceleration with lifting load)
· Check if Pr.22 Stall prevention operation level is set too low like the no-load current.
Check if the stall prevention operation is frequently activated in an application with a large 
load inertia.
Corrective action
· Decrease the acceleration time.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886)(
 Refer to Chapter 4 of the Instruction 
Manual (Applied).)
· Set a value larger than the no load current in Pr. 22 Stall prevention operation level.
Set Pr.154 Voltage reduction selection during stall prevention operation = "10 or 11". (
 Refer to 
Chapter 4 of the Instruction Manual (Applied).)
V/F
V/F
V/F
S
 MFVC
S
 MFVC
S
 MFVC
V/F
V/F
V/F
S
 MFVC
S
 MFVC
S
 MFVC
bcnc22005632.fm  1 ページ  2012年6月6日 水曜日 午後2時53分