Machine Protection
6-
53
Changing Stall Prevention Level during Operation Using an Analog Input
If you set H3-09 (Multi-function Analog Input Terminal A2 Function Selection)
to 8 (stall prevention level during run), you can change the
stall level during operation by setting H3-10 [Gain (Terminal A2)] and H3-11 [Bias (Terminal A2)]
The stall prevention level during operation enabled is the multi-function analog input terminal A2
input
level or the set value in constant L3-06, whichever is the smaller.
Fig 6.38 Stall Prevention Level during Operation Using an Analog Input
Using Frequency Detection
Set these constants when outputting one of the frequency agree or frequency detection signals from a multi-
function output.
INFO
If the motor capacity is smaller than the Inverter capacity or the motor stalls when operating at the factory set-
tings, lower the stall prevention level during operation.
Con-
stant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Control Methods
MEMO
BUS
Regis-
ter
V/f
V/f
with
PG
Open
Loop
Vec-
tor
Flux
Vec-
tor
L4-01
Speed agree-
ment detec-
tion level
Effective when “Desired fre-
quency (ref/setting) agree 1,”
“Frequency detection 1,” or
“Frequency detection 2" is set
for a multi-function output.
Frequencies to be detected are
set in Hz units.
0.0 to
400.0
*1
0.0 Hz
No
A
A
A
A
499H
0.0 to
300.0
*2
L4-02
Speed agree-
ment detec-
tion width
Effective when “Frequency
(speed) agree 1,” “Desired fre-
quency (speed) agree 1,” or
“Frequency (FOUT) detection
1,” Frequency (FOUT) detection
2 is set for a multi-function out-
put.
Sets the frequency detection
width in Hz units.
0.0 to
20.0
2.0 Hz
No
A
A
A
A
49AH
or H3-05 (Multi-function
Analog Input Terminal A3 Function Selection)
or H3-06 [Gain (Terminal A3)] and H3-07 [Bias (Terminal A3)
or A3
Stall prevention level during operation
Multi-function analog input
terminal A2, A3 input level
(4 mA) (8.8 mA) (20 mA)
When using flux vector control, the motor speed is detected.
