MITSUBISHI ELECTRIC FR-S520E - Manual (Page 89)

79
Explanation of functions (parameters)
2
F
UNCT
IO
NS
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
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
(*)
Pr. 21
Setting
High
Response
Current
Limit
:
Activated
:Not
activated
Stall
Prevention
Operation
Selection
:
Activated
:Not
activated
OL Sig-
nal Out-
put
:
Opera-
tion con-
tinued
:
Opera-
tion not
contin-
ued(*)
A
ccel
era
ti
o
n
Cons
ta
nt
spe
e
d
D
ecel
era
ti
o
n
A
ccel
era
ti
o
n
Cons
ta
nt
spe
e
d
D
ecel
era
ti
o
n
0 16
1 17
2 18
3 19
4 20
5 21
6 22
7 23
8 24
9 25
10 26
11 27
12 28
13 29
14 30
15 31
* 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 " ")
10
0 Dr
iv
in
g
R
egene ra
tiv
e