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4.2.12 Stall prevention (Pr. 22, Pr. 23, Pr. 66, Pr. 148, Pr. 149, Pr. 154)
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"
Pr. 148 "stall prevention operation level at 0V input"
Pr. 149 "stall prevention operation level at 10V input"
Pr. 154 "voltage reduction selection during stall prevention operation"
# Set the output current level at which the output frequency is adjusted so that the inverter will not come to an
alarm stop due to overcurrent etc.
# For high-speed operation at or over the more 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 〈50Hz〉 in Pr. 66 and 100% in Pr. 23.
# In order to provide torque during stall prevention, Pr. 154 is factory-set not to reduce the output voltage. The
setting of reducing the output voltage further decreases the probability of overcurrent trip occurrence.
# The stall prevention operation level can be varied by entering the analog signal into terminal 1.
Parameter Number
Factory Setting
22
23
66
148
149
154
Pr.22
Pr.23
Pr.66
(150%)
(120%)
Pr.148
0%
0V
Input voltage (V)
(across frequency setting terminals 1-5)
Setting Range
120%
0 to 150%, 9999
9999
0 to 200%, 9999
60Hz 〈50Hz〉
0 to 120Hz
120%
0 to 150%
150%
0 to 150%
1
0, 1
= 9999
Pr.23
Reduction ratio
compensation factor (%)
120Hz Output
frequency (Hz)
Pr.149
10(5)V
Related parameters
Pr. 9 "electronic thermal O/L relay"
Pr. 48 "second stall prevention
operation current"
Pr. 49 "second stall prevention
operation frequency"
Pr. 73 "0-5V/0-10V selection"
Pr. 156 "stall prevention operation
selection"
Remarks
9999: Analog variable
9999: Constant according to Pr. 22
(Bias)
(Gain)
0: Output voltage reduced
1: Output voltage not reduced
Setting example
(Pr.22=120%, Pr.23=100%, Pr.66=60Hz)
120
90
72
60
0
79
PARAMETERS
60
80
100
120
Output
frequency (Hz)
4
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