PARAMETERS
80
"
"
Stall prevention (Pr. 22, Pr. 23, Pr. 66)
4.2.11 Stall prevention (Pr. 22, Pr. 23, Pr. 66)
Pr. 22 "stall prevention operation level"
Pr. 23 "stall prevention operation level compensation factor at double
speed"
Pr. 66 "stall prevention operation level reduction starting frequency"
!
Set the output current level at which the output frequency is adjusted to prevent the
inverter from coming to an alarm stop due to overcurrent etc.
!
For high-speed operation at or over the motor base frequency, acceleration may not
be made because the motor current does not increase.
To improve the operation characteristics of the motor in such a case, the stall
prevention level in the high-frequency range can be reduced. This is effective for
operation of a centrifugal separator up to the high-speed range. Normally, set 50Hz
in Pr. 66 and 100% in Pr. 23.
!
For operation in the high-frequency range, the current in the locked motor state is
smaller than the rated output current of the inverter and the inverter does not result
in an alarm (protective function is not activated) if the motor is at a stop. To improve
this and activate the alarm, the stall prevention level can be reduced.
Parameter
Number
Factory
Setting
Setting
Range
Remarks
22
150%
0 to 200%
23
9999
0 to 200%,
9999
9999: Constant
according to Pr. 22
66
50Hz
0 to 400Hz
Output frequency (Hz)
400Hz
Pr.66
Pr.22
Pr.23
Pr.23 =9999
S
tal
l pr
ev
en
ti
on
o
per
ati
on l
e
v
e
l (
%
)
Reduction ratio
compensation
factor (%)
150
90
60
45
30
22.5
60
0
100
200
300
400
Setting example
(Pr.22=150%, Pr.23=100%, Pr.66=60Hz)
Cur
ren
t l
imi
t
oper
ati
on l
e
v
e
l
(%
)
Output frequency (Hz)
