Stall Prevention Operation - Mitsubishi Electric FR-A720-0.4K Instruction Manual
Fr-a700 series
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Also See for FR-A720-0.4K:
- Instruction manual (523 pages) ,
- Instruction manual (472 pages) ,
- Instruction manual (235 pages)
Table of Contents
Adjust the output torque of the motor (current)
4.8.4
Stall prevention operation (Pr. 22, Pr. 23, Pr. 48, Pr. 49, Pr. 66, Pr. 114, Pr. 115,
Pr. 148, Pr. 149, Pr. 154, Pr. 156, Pr. 157, Pr. 858, Pr. 868)
This function monitors the output current and automatically changes the output frequency to prevent the inverter
Pr.21
from coming to an alarm stop due to overcurrent, overvoltage, etc. It can also limit stall prevention and fast-
page 168
response current limit operation during acceleration/deceleration, driving or regeneration. Invalid under real
Pr.24
sensorless vector control or vector control.
page 161
Stall prevention
Pr.47
page 155
If the output current exceeds the stall prevention operation level, the output frequency of the inverter is
automatically varied to reduce the output current.
Pr.50
page 235
Also the second stall prevention function can restrict the output frequency range in which the stall prevention
function is valid. (Pr. 49)
Pr.65
page 260
Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.
Pr.67
page 260
Parameter
Pr.113
Number
page 155
Pr.116
Stall prevention operation
22
page 235
level
Pr.145
page 372
Stall prevention operation
23
level compensation factor
Pr.150
at double speed
page 237
Pr.153
Second stall prevention
48
page 237
operation current
Pr.155
page 225
Second stall prevention
49
Pr.158
operation frequency
page 242
Pr.850
Stall prevention operation
66
page 194
reduction starting frequency
Pr.859
page 181
Third stall prevention
114
operation current
Pr.867
page 247
Pr.872
Thrid stall prevention
115
page 263
operation frequency
Stall prevention level at 0V
148
input
Stall prevention level at
149
10V input
Voltage reduction
154
selection during stall
prevention operation
Stall prevention operation
156
selection
157
OL signal output timer
Terminal 4 function
858
assignment
Terminal 1 function
868
assignment
Pr.22
OL
Stall prevention operation example
CAUTION
⋅ If an overload status lasts long, an inverter trip (e.g. electronic thermal relay function (E.THM)) may occur.
⋅ When Pr. 156 has been set to activate the fast-response current limit (initial setting), the Pr. 22 setting should not be higher than
170%. The torque will not be developed by doing so.
⋅ When real sensorless vector control or vector control is selected using Pr. 800 Control method selection, Pr.22 serves as torque limit level.
For the 3.7K or less, the Pr. 22 setting changes from 150% (initial value) to 200%.
148
Name
Initial Value
150%
9999
150%
0Hz
60Hz
150%
0Hz
150%
200%
1
0
0s
0
0
(1) Setting of stall prevention operation level (Pr. 22)
Output current
⋅ Set in Pr. 22 the ratio of the output current to the rated inverter current at
which stall prevention operation will be performed. Normally set 150%
(initial value).
Output frequency
⋅ Stall prevention operation stops acceleration (makes deceleration) during
Constant
acceleration, makes deceleration during constant speed, and stops
speed
deceleration during deceleration.
Time
⋅ When stall prevention operation is performed, the OL signal is output.
Setting
Range
0
Stall prevention operation selection becomes invalid.
Set the current value at which stall prevention
0.1 to 400%
operation will be started.
The stall operation level can be reduced when
0 to 200%
operating at a high speed above the rated frequency.
9999
Constant according to Pr. 22
0
Second stall prevention operation invalid
0.1 to 220%
The second stall prevention operation level can be set.
0
Second stall prevention operation invalid
Set the frequency at which stall prevention operation
0.01 to 400Hz
of Pr. 48 is started.
9999
Pr. 48 is valid when the RT signal is on.
Set the frequency at which the stall operation level is
0 to 400Hz
started to reduce.
0
Third stall prevention operation invalid
Stall prevention operation level can be changed with
0.1 to 220%
the X9 signal.
0
Third stall prevention operation invalid
Set the frequency at which stall prevention operation
0.01 to 400Hz
when the X9 signal is on starts.
0 to 220%
Stall prevention operation level can be changed by
the analog signal input to terminal 1 (terminal 4).
0 to 220%
0
With voltage reduction
1
Without voltage reduction
0 to 31,
You can select whether stall prevention operation and fast-
100, 101
response current limit operation will be performed or not.
Set the output start time of the OL signal output when
0 to 25s
stall prevention is activated.
9999
Without the OL signal output
By setting "4", the stall prevention operation level can
0, 4, 9999
be changed with a signal to terminal 4.
By setting "4", the stall prevention operation level can
0, 2 to 5, 9999
be changed with a signal to terminal 1.
V/F
V/F
V/F
Magnetic flux
Magnetic flux
Magnetic flux
Description
You can select whether to use
output voltage reduction during
stall prevention operation or not.
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