Stall Prevention Operation (Pr. 22, Pr. 23, Pr. 48, Pr. 66, Pr. 156, Pr. 157) - Mitsubishi Electric FR-D700 Instruction Manual

Adjust the output torque (current) of the motor
4.3.4

Stall prevention operation (Pr. 22, Pr. 23, Pr. 48, Pr. 66, Pr. 156, Pr. 157)

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.
Parameter
Number
Stall prevention operation
22
level
Stall prevention
operation level
23
compensation factor
at double speed
Second stall prevention
48
operation current
Stall prevention
66 operation reduction
starting frequency
Stall prevention operation
156
selection
157 OL signal output timer
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 157)
(1) Block diagram
Pr. 22
Pr. 48
74
Name Initial Value
150%
RT
RT
Setting Range
0
0.1 to 200%
0 to 200%
9999
9999
0
9999 0.1 to 200%
9999
50Hz 0 to 400Hz
0 0 to 31, 100, 101
0 to 25s
0s
9999
= 0
Stall prevention operation invalid
+
Stall prevention operation level
0
-
Output frequency
Pr. 23, Pr. 66
Description
Stall prevention operation invalid
Set the current value to start the stall
prevention operation.
The stall operation level can be reduced
when operating at a high speed above the
rated frequency.
Constant according to Pr. 22.
Stall prevention operation invalid
Second stall prevention operation level
Same level as Pr. 22.
Set the frequency at which the stall
operation level is started to reduce.
Select whether stall prevention operation
and fast-response current limit operation
will be performed or not.
Output start time of the OL signal output
when stall prevention is activated.
Without the OL signal output