Stall Prevention Operation - Mitsubishi Electric 800 Series Instruction Manual

(H) Protective function parameter
5.10.10

Stall prevention operation

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
22 Stall prevention operation
H500 level
156 Stall prevention operation
H501 selection
48 Second stall prevention
H600 operation level
49 Second stall prevention
H601 operation frequency
114 Third stall prevention
H602 operation level
115 Third stall prevention
H603 operation frequency
Stall prevention operation
23
level compensation
H610
factor at double speed
Stall prevention operation
66
reduction starting
H611
frequency
148 Stall prevention level at 0
H620 V input
149 Stall prevention level at
H621 10 V input
Voltage reduction
154
selection during stall
H631
prevention operation
157
OL signal output timer
M430
858 Terminal 4 function
T040 assignment
868 Terminal 1 function
T010 assignment

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)
332
PARAMETERS
Initial Setting
value range
0
150%
0.1 to 400%

0 to 31,
0
100 to 101
0
150%
0.1 to 400%

0
0 Hz 0.01 to 590 Hz
9999
0
150%
0.1 to 400%

0
0 Hz
0.01 to 590 Hz
0 to 200%
9999
9999
60 Hz 0 to 590 Hz
150% 0 to 400%

200% 0 to 400%

0
1
1
10
11
0 to 25 s
0 s
9999
0 0, 1, 4, 9999
0 0 to 6, 9999
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Description
Stall prevention operation disabled.
Set the current limit at which the stall prevention operation will
start.
Enable/disable the stall prevention operation and the
fast-response current limit operation.
Second stall prevention operation disabled.
The stall prevention operation level can be changed using the RT
signal.
Second stall prevention operation disabled.
Set the frequency at which the Pr.48 stall prevention operation will
start.
Pr.48 is enabled when RT signal is ON.
Third stall prevention operation disabled.
The stall prevention operation level can be changed using the X9
signal.
Third stall prevention operation disabled.
Set the frequency at which the stall prevention operation will start
when the X9 signal turns ON.
The stall operation level when running at high speeds above the
rated frequency can be reduced.
Stall prevention operation disabled at double speed.
Set the frequency at which the stall operation level reduction will
start.
The stall prevention operation level can be changed by the analog
signal input to the terminal 1 (terminal 4).
Output voltage reduction
Enable/disable the output voltage
enabled.
reduction during stall prevention
Output voltage reduction
operation.
disabled.
Output voltage reduction
Use this setting when the overvoltage
enabled.
protective function (E.OV[ ]) activates
during stall prevention operation in an
Output voltage reduction
application with large load inertia.
disabled.
Set the OL signal output start time when stall prevention is
activated.
No OL signal output.
When set "4", the stall prevention level can be changed with the
signal to the terminal 4.
When set "4", the stall prevention level can be changed with the
signal to the terminal 1.