76
Adjust the output torque (current) of the motor
(4) Setting of stall prevention operation in high frequency range
(Pr. 22, Pr. 23, Pr. 66)
During high-speed operation above the rated motor frequency, acceleration may not be made because the motor current
does not increase. If operation is performed in a high frequency range, the current at motor lockup becomes smaller than
the rated output current of the inverter, and the protective function (OL) is not executed even if the motor is at a stop.
To improve the operating characteristics of the motor in this case, the stall prevention level can be reduced in the high
frequency range. This function is effective for performing operation up to the high-speed range on a centrifugal separator
etc. Normally, set 50Hz in
Pr. 66
and 100% in
Pr. 23
.
Formula for stall prevention operation level
By setting "9999" (initial value) in
Pr. 23
Stall prevention operation level compensation factor at double speed
, the stall
prevention operation level is constant at the
Pr. 22
setting up to 400Hz.
(5) Set two types stall prevention operation levels
(Pr. 48)
Turning RT signal on makes
Pr. 48
Second stall prevention operation current
valid.
For the terminal used for RT signal input, set "3" in any of
Pr. 178 to Pr. 182 (input terminal function selection)
to assign the
function.
Stall prevention operation level
in high frequency range (%)
= A + B
×
[
Pr. 22
-
A
]
×
[
Pr. 23
- 100
]
Pr. 22
- B
100
However,
A =
Pr. 66
(Hz)
×
Pr. 22
(%)
, B =
Pr. 66
(
Hz
)
×
Pr. 22
(
%
)
Output frequency (Hz)
400Hz
NOTE
Changing the terminal assignment using
Pr. 178 to Pr. 182 (input terminal function selection)
may affect the other
functions. Make setting after confirming the function of each terminal.
The RT signal acts as the second function selection signal and makes the other second functions valid.
Output frequency (Hz)
Pr. 22
When
Pr. 23
= 9999
Pr. 66
400Hz
Stall prevention operation
level (%)
Stall prevention operation level
as set in
Pr. 23
When
Pr. 23
= "9999", the stall prevention
operation level is as set in
Pr. 22
to 400Hz.
Output frequency (Hz)
Setting example
Stall prevention
operation level (%)
Pr. 22
=
150%
Pr. 23
= 100%
Pr. 66
= 50Hz
150
75
37.5
25
18.75
50
0
100
200
300
400
Содержание FR-D700 Series
Страница 11: ...VII MEMO ...
Страница 23: ...12 MEMO ...
Страница 57: ...46 MEMO ...
Страница 262: ...258 MEMO ...
Страница 276: ...272 MEMO ...
Страница 283: ...279 APPENDIX This chapter provides the APPENDIX of this product Always read the instructions before using the equipment ...
Страница 287: ...283 MEMO ...
Страница 289: ......