Mitsubishi Electric FR-F720P-0.75K to 110K Instruction Manual page 398

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)
The setting values "10 and 11" are added for Pr.154 Voltage reduction selection during stall prevention operation.
Parameter
Name
Number
154
Voltage reduction selection
V/F V/F V/F
during stall prevention
operation
S S S
MFVC MFVC MFVC
(1) To further prevent a trip (Pr. 154)
 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
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
Description
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 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 point
 Check if the stall prevention operation is frequently activated in an application with a large
· Decrease the acceleration time.
· Use the regeneration avoidance function (Pr. 882 to Pr. 886). (
Corrective action
· 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". (
Initial
Value
1
V/F V/F V/F
E.OV1
load inertia.
Manual (Applied).)
Chapter 4 of the Instruction Manual (Applied).)
Setting
Range
With voltage
0
reduction
Without voltage
1
reduction
With voltage
10
reduction
Without voltage
11
reduction
< V / F > < S M F V C >
S S S
MFVC MFVC MFVC
FR-PU04
OV During Acc
FR-PU07
1/2
Description
You can select whether to use
output voltage reduction during
stall prevention operation or not.
Use these settings when the
overvoltage protective function
(E.OV) activates during stall
prevention operation in an
application with large load inertia.
Refer to Chapter 4 of the Instruction
Refer to
BCN-C22005-632