Stall Prevention Operation - Mitsubishi Electric FR-A820-00046 Instruction Manual

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(H) Protective function parameter
5.10.11

Stall prevention operation

This function monitors the output current and automatically changes the output frequency to pre-
vent the inverter from tripping due to overcurrent, overvoltage, etc. It can also limit the stall preven-
tion and fast-response current limit operation during acceleration/deceleration and power/regener-
ative driving.
This function is disabled during Real sensorless vector control, vector control and PM sensorless vec-
tor 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.
22
H500
156
H501
48
H600
49
H601
114
H602
115
H603
23
H610
66
H611
148
H620
149
H621
154
H631
5 - 314
Name
FM
Stall prevention operation
level
Stall prevention operation
selection
Second stall prevention
operation level
Second stall prevention
operation frequency
Third stall prevention
operation level
Third stall prevention
operation frequency
Stall prevention operation
level compensation factor
at double speed
Stall prevention operation
60
reduction starting
Hz
frequency
Stall prevention level at 0 V
input
Stall prevention level at 10
V input
Voltage reduction
selection during stall
prevention operation
V/F
V/F
V/F
Magnetic flux
Magnetic flux
Magnetic flux
Initial
Setting
value
Description
range
CA
0
Stall prevention operation disabled.
150%
Set the current limit at which the stall prevention
0.1 to 400%
operation will start.
0 to 31,
Enable/disable the stall prevention operation and the
0
100 to 101
fast-response current limit operation.
0
Second stall prevention operation disabled.
150%
The stall prevention operation level can be changed
0.1 to 400%
using the RT signal.
0
Second stall prevention operation disabled.
Set the frequency at which the Pr. 48 stall prevention
0Hz
0.01 to 590 Hz
operation will start.
9999
Pr. 48 is enabled when RT signal is ON.
0
Third stall prevention operation disabled.
150%
The stall prevention operation level can be changed
0.1 to 400%
using the X9 signal.
0
Third stall prevention operation disabled.
0 Hz
Set the frequency at which the stall prevention
0.01 to 590 Hz
operation will start when the X9 signal turns ON.
The stall operation level when running at high speeds
0 to 200%
above the rated frequency can be reduced.
9999
9999
Stall prevention operation disabled at double speed.
50
Set the frequency at which the stall operation level
0 to 590 Hz
Hz
reduction will start.
150%
0 to 400%
The stall prevention operation level can be changed by
the analog signal input to the terminal 1 (terminal 4).
200%
0 to 400%
Output voltage
0
reduction enabled.
Output voltage
1
reduction disabled.
1
Output voltage
10
reduction enabled.
Output voltage
11
reduction disabled.
Parameters
Enable/disable the output
voltage reduction during stall
prevention operation.
Use this setting when the
overvoltage protective
function (E.OV[ ]) activates
during stall prevention
operation in an application
with large load inertia.

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