(H) Protective function parameter
348
PARAMETERS
5.10.11 Stall prevention operation
The upper limit of stall prevention operation is limited internally to the following.
120% (SLD rating), 150% (LD rating), 220% (ND rating), or 280% (HD rating)
This function monitors the output current and automatically changes the output frequency to prevent the inverter from
tripping due to overcurrent, overvoltage, etc. It can also limit the stall prevention and fast-response current limit
operation during acceleration/deceleration and power/regenerative driving.
This function is disabled during Real sensorless vector control, vector control and PM sensorless vector control.
• Stall prevention
If the output current exceeds the stall prevention operation level, the output frequency of the inverter is automatically
changed to reduce the output current.
Also the second stall prevention function can limit the output frequency range in which the stall prevention function is
enabled.
• Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.
Pr. Name
Initial value Setting
range
Description
FM CA
22
H500
Stall prevention operation
level
150%
0 Stall prevention operation disabled.
0.1 to 400%
Set the current limit at which the stall prevention operation will
start.
156
H501
Stall prevention operation
selection
0
0 to 31,
100 to 101
Enable/disable the stall prevention operation and the
fast-response current limit operation.
48
H600
Second stall prevention
operation level
150%
0 Second stall prevention operation disabled.
0.1 to 400%
The stall prevention operation level can be changed using the
RT signal.
49
H601
Second stall prevention
operation frequency
0 Hz
0 Second stall prevention operation disabled.
0.01 to 590 Hz
Set the frequency at which the Pr.48 stall prevention operation
will start.
9999 Pr.48 is enabled when RT signal is ON.
114
H602
Third stall prevention
operation level
150%
0 Third stall prevention operation disabled.
0.1 to 400%
The stall prevention operation level can be changed using the
X9 signal.
115
H603
Third stall prevention
operation frequency
0 Hz
0 Third stall prevention operation disabled.
0.01 to 590 Hz
Set the frequency at which the stall prevention operation will
start when the X9 signal turns ON.
23
H610
Stall prevention operation
level compensation
factor at double speed
9999
0 to 200%
The stall operation level when running at high speeds above
the rated frequency can be reduced.
9999 Stall prevention operation disabled at double speed.
66
H611
Stall prevention operation
reduction starting
frequency
60 Hz 50 Hz 0 to 590 Hz
Set the frequency at which the stall operation level reduction
will start.
148
H620
Stall prevention level at 0
V input
150% 0 to 400%
The stall prevention operation level can be changed by the
analog signal input to the terminal 1 (terminal 4).
149
H621
Stall prevention level at
10 V input
200% 0 to 400%
154
H631
Voltage reduction
selection during stall
prevention operation
1
0
Output voltage reduction
enabled.
Enable/disable the output voltage
reduction during stall prevention
operation.
1
Output voltage reduction
disabled.
10
Output voltage reduction
enabled.
Use this setting when the
overvoltage protective function
(E.OV[ ]) activates during stall
prevention operation in an
application with large load inertia.
11
Output voltage reduction
disabled.
157
M430
OL signal output timer
0 s
0 to 25 s
Set the OL signal output start time when stall prevention is
activated.
9999 No OL signal output.
858
T040
Terminal 4 function
assignment
0 0, 1, 4, 9999
When set "4", the stall prevention level can be changed with
the signal to the terminal 4.
868
T010
Terminal 1 function
assignment
0 0 to 6, 9999
When set "4", the stall prevention level can be changed with
the signal to the terminal 1.
V/F
V/F
Magnetic flux
Magnetic flux
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