(H) Protective function parameter
PARAMETERS
349
5
GROUP
H
Setting the stall prevention operation level (Pr.22)
NOTE
• A continuous overloaded condition may activate a protective function such as motor overload trip (electronic thermal O/L
relay function) (E.THM).
• When Pr.156 has been set to activate the fast response current limit (initial value), the Pr.22 setting should not be higher than
170%. Such setting will prevent torque generation
•
When Real sensorless vector control or vector control is selected using
Pr. 800 Control method selection, Pr.22
serves as
torque limit level.
For the FR-A820-00250(3.7K) or lower and FR-A840-00126(3.7K) or lower, the initial value of Pr.22 is 200% instead of
150%.
•For Pr.22 Stall prevention operation level, set the ratio of the output
current to the inverter's rated current at which the stall prevention operation
will be activated. Normally, this should be set at 150% (initial value).
• Stall prevention operation stops acceleration (makes deceleration) during
acceleration, makes deceleration during constant speed, and stops
deceleration during deceleration.
• When the stall prevention operation is performed, the Overload warning
(OL) signal is output.
Stall prevention operation example
Pr.22
OL
Output current
Output frequency
Acceleration
Constant
speed
Deceleration
Time
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