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Explanation of functions (parameters)
2
FUNCTIONS
2.3.12 Stall prevention function and current limit function
(Pr. 21 )
You can make setting to prevent stall caused by overcurrent and/or to prevent the
inverter from resulting in an overcurrent trip (to disable fast-response current limit
that limits the current) when an excessive current flows due to sudden load
fluctuation or ON-OFF on the output side of a running inverter.
• Stall prevention
If the current exceeds the stall prevention operation level (Pr.22), the output
frequency of the inverter is automatically varied to reduce the current.
• High response current limit
If the current exceeds the limit value, the output of the inverter is shut off to
prevent an overcurrent.
Parameter Name
Factory
Setting
Setting
Range
Remarks
21
Stall prevention
function selection
0 0 to 31, 100
Setting is enabled when Pr. 30 =
"1".
Pr. 21
Setting
High
Response
Current
Limit
:
Activated
: Not
activated
Stall
Prevention
Operation
Selection
:
Activated
: Not
activated
OL Signal
Output
:
Operation
continued
:
Operation
not
continued
(*1)
Pr. 21
Setting
High
Response
Current
Limit
:
Activated
:Not
activated
Stall
Prevention
Operation
Selection
:
Activated
:Not
activated
OL Signal
Output
:
Operation
continued
:
Operation
not
continued
(*1)
Acceleration
Constant
speed
Deceleration
Acceleration
Constant
speed
Deceleration
016
117
218
319
420
521
622
723
824
925
10 26
11 27
12 28
13 29
14 30
15
(*2) 31 (*2)
*1 When "Operation not continued for OL
signal output" is selected, the "OLT" alarm
code (stopped by stall prevention) is
displayed and operation stopped.
(Alarm stop display " ")
*2 Since both fast response current limit and
stall prevention are not activated, OL signal
and OLT are not output.
100
Driving
Regene
rative
(*2)