PARAMETERS
86
4.2.10 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 or the like.
"
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 Factory Setting Setting Range Remarks
22 150% 0 to 200%
23 9999 0 to 200%, 9999
9999: Constant according
to Pr. 22
66 60Hz 0 to 400Hz
Pr.22
Pr.23
Pr.23 =9999
400Hz
Pr.66
Output frequency (Hz)
Stall prevention
operation level (%)
Reduction ratio
compensation
factor (%)
150
90
60
45
30
22.5
600 100 200 300 400
Current limit
operation level (%)
Output frequenc
Hz
Settin
example
(Pr.22=150%, Pr.23=100%, Pr.66=60Hz)
Pr. 9 "electronic thermal O/L
relay"
Pr. 48 "second electronic
overcurrent protection"
Related parameters
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