Mitsubishi Electric FR-A800, Instruction Manual

Page: 494 / 1042

(H) Protective function parameter Parameters
5 - 314
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. Name
Initial
value
Setting
range
Description
FM CA
22
H500
Stall prevention operation
level
150%
0 Stall prevention operation disabled.
0.1 to 400%
Set the current limit at which the stall prevention
operation will start.
156
H501
Stall prevention operation
selection
0
0 to 31,
100 to 101
Enable/disable the stall prevention operation and the
fast-response current limit operation.
48
H600
Second stall prevention
operation level
150%
0 Second stall prevention operation disabled.
0.1 to 400%
The stall prevention operation level can be changed
using the RT signal.
49
H601
Second stall prevention
operation frequency
0Hz
0 Second stall prevention operation disabled.
0.01 to 590 Hz
Set the frequency at which the Pr. 48 stall prevention
operation will start.
9999 Pr. 48 is enabled when RT signal is ON.
114
H602
Third stall prevention
operation level
150%
0 Third stall prevention operation disabled.
0.1 to 400%
The stall prevention operation level can be changed
using the X9 signal.
115
H603
Third stall prevention
operation frequency
0 Hz
0 Third stall prevention operation disabled.
0.01 to 590 Hz
Set the frequency at which the stall prevention
operation will start when the X9 signal turns ON.
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 will start.
148
H620
Stall prevention level at 0 V
input
150%
0 to 400%
The stall prevention operation level can be changed by
the analog signal input to the terminal 1 (terminal 4).
149
H621
Stall prevention level at 10
V input
200%
0 to 400%
154
H631
Voltage reduction
selection during stall
prevention operation
1
0
Output voltage
reduction enabled.
Enable/disable the output
voltage reduction during stall
prevention operation.
1
Output voltage
reduction disabled.
10
Output voltage
reduction enabled.
Use this setting when the
overvoltage protective
function (E.OV[ ]) activates
during stall prevention
operation in an application
with large load inertia.
11
Output voltage
reduction disabled.
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux