Mitsubishi Electric FR-E800, Instruction Manual

Page: 257 / 484

256
11. (H) Protective Function Parameters
11.10 Stall prevention operation
11.10
Stall prevention operation
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 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.
*1 Gr.1 and Gr.2 are the parameter initial value groups. (Refer to page 52 ).
*2 The upper limit of stall prevention operation is limited internally to the following.
150% (LD rating), 200% (ND rating)
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Pr. Name
Initial value
*1
Setting range Description
Gr.1 Gr.2
22
H500 Stall prevention
operation level
150%
0 Stall prevention operation disabled.
0.1% to 400%
*2
Set the current limit at which the stall prevention operation
starts.
156
H501 Stall prevention
operation selection
0 0 to 31, 100, 101
Enable/disable the stall prevention operation and the fast-
response current limit operation.
48
H600 Second stall prevention
operation level
9999
0 Second stall prevention operation disabled.
0.1% to 400%
*2
The stall prevention operation level can be changed using
the RT signal.
9999 Same as Pr.22 .
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
starts.
154
H631
Voltage reduction
selection during stall
prevention operation
1
1 Does not suppress the overvoltage protective function
11 Suppresses the overvoltage protective function
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.
277
H630
Stall prevention
operation current
switchover
0
0 Stall prevention is activated when the output current
exceeds the stall prevention operation level.
1 Stall prevention is activated when the output torque (current
equivalent to the torque) exceeds the stall prevention
operation level.