Mitsubishi Electric FR-A800, Instruction Manual

Page: 496 / 1042

(H) Protective function parameter Parameters
5 - 316
Disabling the stall prevention operation and fast-response current limit according to operating
conditions (Pr. 156)
Referring to the table below, enable/disable the stall prevention operation and the fast-response cur-
rent limit operation, and also set the operation at OL signal output.
When "operation stop at OL signal output" is selected, the fault output " " (stop due to
stall prevention) is displayed, and operation stops.
The OL signal and E.OLT are not output because fast-response current limit and stall prevention
are not operating.
Setting values "100, 101" can be individually set for power driving and regenerative driving. The
setting value "101" disables the fast-response current limit during power driving.
Pr. 156
setting
Fast response
current limit

: enabled

: disabled
Stall prevention
operation selection

: enabled

: disabled
OL signal
output

:
operation
continued

:
operation
stopped
Pr. 156
setting
Fast response
current limit

: enabled

: disabled
Stall prevention
operation selection

: enabled

: disabled
OL signal
output

:
operation
continued

:
operation
stopped
A
cce
le
rat
io
n
C
o
nsta
n
t sp
eed
De
ce
le
ra
ti
o
n
A
cce
le
rat
io
n
C
o
nsta
n
t sp
eed
De
ce
le
ra
ti
o
n
0
(initial value)
    
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
    ⎯
100
Po
w
e
r
dri
v
ing
    
101
Po
w
e
r
dri
v
ing
    
Reg
ener
a
tiv
e
drivi
n
g
    ⎯
Reg
ener
a
tiv
e
drivi
n
g
    ⎯
Tab. 5-120: Setting of parameter 156
NOTES When the load is heavy or the acceleration/deceleration time is short, stall prevention operates
and acceleration/deceleration may not be performed according to the time set. In such case, set
the Pr. 156 and the stall prevention operation level to the optimum values.
For lift applications, make settings to disable the fast-response current limit. Otherwise, the torque
may be insufficient, causing the load to drop.