124
Br
ake
seque
nce fu
nction
278
Brake opening
frequency
0.01Hz
3Hz
0 to 30Hz
Set to the rated slip frequency of the motor
+ about 1.0Hz.
This parameter may be only set if
Pr. 278
≤
Pr. 282
.
{
{
{
279
Brake opening
current
0.1%
130%
0 to 220%
Generally, set this parameter to about 50 to
90%. If the setting is too low, the load is
liable to drop due to gravity at start.
Suppose that the rated inverter current is
100%.
{
{
{
280
Brake opening
current detection
time
0.1s
0.3s
0 to 2s
Generally, set this parameter to about 0.1
to 0.3s.
{
{
{
281
Brake operation
time at start
0.1s
0.3s
0 to 5s
Pr. 292
= 7: Set the mechanical delay time
until the brake is loosened.
Pr. 292
= 8: Set the mechanical delay time
until the brake is lo about 0.1 to
0.2s.
{
{
{
282
Brake operation
frequency
0.01Hz
6Hz
0 to 30Hz
At this frequency, the brake opening
request signal (BOF) is switched off.
Generally, set this parameter to the
Pr. 278
s 3 to 4Hz.
Setting is enabled only when
Pr. 282
≥
Pr.
278
.
{
{
{
283
Brake operation
time at stop
0.1s
0.3s
0 to 5s
Pr. 292
= 7: Set the mechanical delay time
until the brake is 0.1s.
Pr. 292
= 8: Set the mechanical delay time
until the brake is about 0.2 to
0.3s.
{
{
{
284
Deceleration
detection function
selection
1
0
0
Deceleration is not detected.
{
{
{
1
If deceleration is not normal during
deceleration operation, the inverter fault
(E.MB2) is provided to trip and turn off the
brake opening request signal (BOF).
285
Overspeed
detection frequency
0.01Hz
9999
0 to 30Hz
When brake sequence function is made
valid under encoder feedback control
If (detected frequency) - (output frequency)
>
Pr. 285
under encoder feedback control,
the inverter fault (E.MB1) is provided to trip
and turn off the brake opening request
signal (BOF).
{
{
{
9999
Overspeed is not detected.
292
Automatic
acceleration/
deceleration
1
0
0, 3, 5 to 8,
11
Brake sequence function is made valid when a setting is "7 or
8".
S
peed deviation e
xcess dete
ction
285
Excessive speed
deviation detection
frequency
0.01Hz
9999
9999
Without speed deviation excessive
{
{
{
0 to 30Hz
If the difference (absolute value) between
the speed command value and actual
speed exceeds the
Pr. 285 Speed deviation
excess detection frequency
setting for longer
than the time set in
Pr. 853 Speed deviation
time
during speed control under vector
control, speed deviation excessive occurs
and error "E. OSD" appears, resulting in a
stop.
853
Speed deviation
time
0.1s
1s
0 to 100s
{
{
{
Fu
nc
tio
n
Parameter
Name
Incre
ments
Initial
Value
Range
Description
Para
meter
copy
Param
eter
clear
All
param
eter
clear
Re
la
te
d
p
a
ra
mete
rs
{
: enabled
×
: disabled
Magnetic fluxM
a
g
n
e
ti
c
f
lu
x
Magnetic flux
SensorlessS
e
n
s
o
rl
e
s
s
Sensorless
VectorV
e
c
to
r
Vector
VectorV
e
c
to
r
Vector
Summary of Contents for FR-A741-11K
Page 7: ...MEMO ...
Page 216: ...209 MEMO ...
