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Stall Prevention Function And Current Limit Function (pr. 21 ) - Mitsubishi Electric FR-S520E Series Instruction Manual

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Explanation of functions (parameters)
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.
• Fast-response current limit
If the current exceeds the limit value, the output of the inverter is shut off to
prevent an overcurrent.
Parameter
Stall prevention
21
function selection
Stall
Prevention
Operation
Fast-
Selection
Response
Current
Limit
Pr. 21
Setting
:
activated
Activated
: Not
activated
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
*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.
)
Factory
Name
Setting
OL Signal
Output
:
:
Operation
Activated
continued
: Not
:
Operation
not
continued
(*1)
⎯ (*2)
")
Setting
Range
0
0 to 31, 100
Fast-
Response
Current
Limit
Pr. 21
Setting
:
Activated
:Not
activated
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
84
Remarks
Setting is enabled when Pr. 30 =
"1".
Stall
Prevention
Operation
Selection
:
Activated
:Not
activated
OL Signal
Output
:
Operation
continued
:
Operation
not
continued
(*1)
⎯ (*2)
⎯ (*2)

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