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Mitsubishi Electric FR-CS84-012 Instruction Manual Page 124

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 Setting for stall prevention operation in the high-frequency range (Pr.22,
Pr.23, Pr.66)
Always at the Pr.22 level
when Pr.23 = "9999"
Pr.22
Stall prevention
operation
level (%)
Pr.66
• When operating at the rated motor frequency or higher, acceleration may not be made as the motor current does not
increase. Also, when operating in the high-frequency range, the current flowing to the locked motor becomes less than the
rated output current of the inverter. Even if the motor is stopped, the protective function does not operate (OL). In a case
like this, the stall prevention level can be reduced in the high-frequency range to improve the motor's operating
characteristics. This is useful when operating up to the high speed range, such as when using a centrifuge. Normally, set
Pr.66 Stall prevention operation reduction starting frequency
to 100%.
factor at double speed
• Calculation formula for stall prevention operation level
Stall prevention operation level (%)
in the high-frequency range
Pr.66 (Hz)× Pr.22 (%)
Where, A =
Output frequency (Hz)
• When
= "9999" (initial value), the stall prevention operation level is constant at the
Pr.23
Parameters referred to
Pr.195 (Output terminal function selection)
Stall prevention operation level
as set in Pr.23
400Hz
Output frequency (Hz)
Pr.22 -A
= A + B × [
] × [
Pr.22
-B
Pr.66 (Hz) × Pr.22 (%)
, B =
400Hz
page 126
Setting example (Pr.22=120%、 Pr.23=100%、 Pr.66=60Hz)
120
Stall prevention
72
operation
level(%)
36
24
18
0
60
to 60 Hz, and
Pr.23 Stall prevention operation level compensation
Pr.23 -100
]
-100
5.6 (H) Protective function parameter
100
200
300
400
Output frequency (Hz)
level up to 400 Hz.
Pr.22
5. PARAMETERS
2
2
3
4
5
6
7
8
9
10
123

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