Stall Prevention Operation - Mitsubishi Electric 800 Series Instruction Manual (Function

12.10

Stall prevention operation

Magnetic flux Magnetic flux Magnetic flux
V/F V/F V/F
This function monitors the output current and automatically changes the output frequency to prevent the inverter from shutting
off 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 under 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
H500 operation level
156 Stall prevention
H501 operation selection
48 Second stall prevention
H600 operation level
Stall prevention
23 operation level
H610 compensation factor at
double speed
Stall prevention
66
operation reduction
H611
starting frequency
Voltage reduction
154
selection during stall
H631
prevention operation
157
OL signal output timer
M430
277
H630
Stall prevention
operation current
switchover
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to
*2 The upper limit of stall prevention operation is limited internally to the following.
150% (LD rating), 200% (ND rating)
*1
Initial value
Setting range
Gr.1 Gr.2
0
150%
0.1% to 400%
0 0 to 31, 100, 101
0
9999
0.1% to 400%
9999
0% to 200%
9999
9999
60 Hz 50 Hz 0 to 590 Hz
1
1
11
0 to 25 s
0 s
9999
0
0
1
page
Description
Stall prevention operation disabled.
Set the current limit at which the stall prevention operation
*2
starts.
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
*2
the RT signal.
Same as Pr.22.
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
starts.
Does not suppress the overvoltage protective function
Suppresses the overvoltage protective function
Set the OL signal output start time when stall prevention is
activated.
No OL signal output.
Stall prevention is activated when the output current
exceeds the stall prevention operation level.
Stall prevention is activated when the output torque (current
equivalent to the torque) exceeds the stall prevention
operation level.
54).
12. (H) Protective Function Parameters
12.10 Stall prevention operation
11
12
13
14
15
16
17
18
19
20
295