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PARAMETERS
5
Adjustment of the output torque (current) of the motor
5.4.5 Stall prevention operation (Pr. 22, Pr. 23, Pr. 48, Pr. 66, Pr. 156, Pr. 157, Pr. 277)
(1) Block diagram
This function monitors the output current and automatically changes the output frequency to prevent the inverter from
coming to trip due to overcurrent, overvoltage, etc. In addition, simple torque limit which limits the output torque to the
predetermined value can be selected.
It can also limit stall prevention and fast-response current limit operation during acceleration/deceleration, driving or
regeneration.
Stall prevention
If the output current exceeds the stall prevention operation level, the output frequency of the inverter is
automatically varied to reduce the output current.
Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to prevent an overcurrent.
Torque limit
The inverter output frequency is controlled so that the output torque (torque current) will not exceed the stall
prevention operation level (motor rated torque is referenced).
Parameter
Number
Name Initial Value Setting Range Description
22∗
Stall prevention operation
level
150%
0 Stall prevention operation invalid
0.1 to 200%
Set the current value to start the stall
prevention operation.
23
Stall prevention
operation level
compensation factor
at double speed
9999
0 to 200%
The stall operation level can be reduced
when operating at a high speed above the
rated frequency.
9999 Constant according to Pr. 22.
48
Second stall prevention
operation current
9999
0 Stall prevention operation invalid
0.1 to 200% Second stall prevention operation level
9999 Same level as Pr. 22.
66
Stall prevention
operation reduction
starting frequency
60Hz 0 to 400Hz
Set the frequency at which the stall
prevention operation level starts being
reduced.
156
Stall prevention operation
selection
0 0 to 31, 100, 101
Select whether stall prevention operation
and fast-response current limit operation
will be performed or not.
157 OL signal output timer
0s
0 to 25s
Output start time of the OL signal output
when stall prevention is activated.
9999 Without the OL signal output
277
Stall prevention operation
current switchover
0
0 Output current is the limit level
1
Output torque (torque current) is the limit
level
The above parameters can be set when Pr. 160 User group read selection = "0". (Refer to page 167)
∗ This parameter allows its setting to be changed during operation in any operation mode even if "0 (initial value) or 1" is set in Pr. 77 Parameter write selection.
Stall prevention operation level
Stall prevention operation invalid
RT
= 0
-
+
P
r. 48
P
r. 22
Output frequency
Pr. 23, Pr. 66
RT
0