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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 will be adjusted to prevent
the inverter from stopping 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 60Hz
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
22
23
66
Pr.22
Pr.23 =9999
Pr.66
Factory
Setting
Setting
Range
150%
0 to 200%
0 to 200%,
9999
9999
60Hz
0 to 400Hz
Reduction ratio
compensation
factor (%)
Pr.23
400Hz
Output frequency (Hz)
Related parameters
Pr. 9 "electronic thermal O/L
relay"
Pr. 48 "second electronic
overcurrent protection"
Pr. 73 "0-5V/0-10V selection"
Remarks
9999: Constant
according to Pr. 22
Setting example
(Pr.22=150%, Pr.23=100%, Pr.66=60Hz)
150
90
60
45
30
22.5
0
60
100
83
PARAMETERS
200
300
400
Output frequency (Hz)
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