Stall Prevention Function And Current Limit Function (Pr. 21 ) - Mitsubishi FR-S500 Instruction Manual

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 high-response current
restriction 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
Stall prevention
21
function selection
Stall
Prevention
Operation
High
Selection
Response
Current
Activated
Limit
Pr. 21
Setting :
activated
Activated
: Not
activated
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
* 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 "
)
Factory
Setting
0
OL Signal
Output
:
:
Operation
continued
: Not
:
Operation
not
continued
(*)
")
Explanation of functions (parameters)
Setting
Range
Setting is enabled when Pr. 30 =
0 to 31, 100
"1".
High
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
75
Remarks
Stall OL Sig-
Prevention
nal Out-
Operation
put
Selection
:
:
Opera-
Activated
tion con-
:Not
tinued
activated
:
Opera-
tion not
contin-
ued(*)
2