Stall Prevention Operation (Pr.22, Pr.23, Pr.48, Pr.49, Pr.66, Pr.148, Pr.149, Pr.154, Pr.156, Pr.157) - Mitsubishi Electric F700 Instruction Manual

Adjust the output torque of the motor (current)
3.2.4 Stall prevention operation
(Pr.22, Pr.23, Pr.48, Pr.49, Pr.66, Pr.148, Pr.149, Pr.154, Pr.156, Pr.157)
This function monitors the output current and automatically changes the output frequency to prevent the
Pr.21
inverter from coming to an alarm stop due to overcurrent, overvoltage, etc. It can also limit stall prevention
page 74
and fast-response current limit operation during acceleration/deceleration, driving or regeneration.
Pr.24
Stall prevention
page 67
If the output current exceeds the stall prevention operation level, the output frequency of the inverter is
Pr.47
automatically varied to reduce the output current.
page 64
Also the second stall prevention function can restrict the output frequency range in which the stall
Pr.50
prevention function is valid. (Pr.49)
page 95
Fast-response current limit
Pr. 65
If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.
page 114
Pr.67
Parameter
page 114
Number
Pr. 144
page 99
Pr.150 Stall prevention operation
22
page 96
level
Pr.153
page 96
Pr.155
Stall prevention operation
page 88
23 level compensation factor
Pr. 158
at double speed
page 104
Second stall prevention
48
operation current
Second stall prevention
49
operation frequency
Stall prevention operation
66
reduction starting 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
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 140)
* When Pr. 570 Multiple rating setting = "1", performing parameter clear changes the initial value and setting range.
Pr.22
OL
Stall prevention operation example
CAUTION
⋅ If an overload status lasts long, an inverter trip (e.g. electronic thermal O/L relay (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 140%. The torque will not be developed by doing so. (When Pr. 570 = "1")
56
Name Initial Value
110% *
9999
110% *
0Hz
50Hz
110% *
120% *
1
0
0s
(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
110% (initial value).
Output frequency
⋅ Stall prevention operation stops acceleration (makes deceleration)
during acceleration, makes deceleration during constant speed, and
Constant
speed
stops deceleration during deceleration.
Time
⋅ When stall prevention operation is performed, the OL signal is output.
Setting
Range
Stall prevention operation selection becomes
0
invalid.
Set the current value at which stall prevention
0.1 to 120% *
operation will be started.
9999 Analog variable
The stall operation level can be reduced when
0 to 150% * operating at a high speed above the rated
frequency.
9999 Constant according to Pr. 22
0 Second stall prevention operation invalid
The second stall prevention operation level can be
0.1 to 120% *
set.
0 Second stall prevention operation invalid
Set the frequency at which stall prevention
0.01 to 400Hz
operation 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
0 to 400Hz
is started to reduce.
0 to 120% *
Stall prevention operation level can be changed
by the analog signal input to terminal 1.
0 to 120% *
With voltage
0
reduction
Without voltage
1
reduction
You can select whether stall prevention operation
0 to 31,
and fast-response current limit operation will be
100, 101
performed or not.
Set the output start time of the OL signal output
0 to 25s
when stall prevention is activated.
9999 Without the OL signal output
Description
You can select whether to use output
voltage reduction during stall
prevention operation or not.
(Refer to page 61)