4-165
With hot start enabled (08-05 = xx1xb), motor overload protection occurs in 3 and a half minutes when operating
the motor at 150% of the motor rated current at an output frequency greater than 60Hz.
Refer to the following figure 4.3.71 for an example of motor overload protection curve.
Low Speed
Hot Start
100%
150%
200%
Motor Load Current (%)
(02-01 = 100%)
Ov
erload Protect Time
(min
)
1.5
2.9
7.9
L
o
w
S
p
e
e
d
C
o
l
d
S
t
a
r
t
1
0
0
%
1
5
0
%
2
0
0
%
M
o
t
o
r
L
o
a
d
C
u
r
r
e
n
t
(
%
)
(
0
2
-
0
1
=
1
0
0
%
)
Ov
erload Protect Time
(
min
)
2
.
4
4
.
5
1
2
.
4
High Speed
(60Hz)
Hot Start
106%
150%
200%
Motor Load Current (%)
(02-01 = 100%)
Ov
erload Protect Time
(min
)
1.7
3.9
28.8
start activacted point
H
i
g
h
S
p
e
e
d
(
6
0
H
z
)
C
o
l
d
S
t
a
r
t
1
0
6
%
1
5
0
%
2
0
0
%
M
o
t
o
r
L
o
a
d
C
u
r
r
e
n
t
(
%
)
(
0
2
-
0
1
=
1
0
0
%
)
Ov
erload Protect Time (
min
)
2
.
7
6
.
1
4
5
.
2
s
t
a
r
t
a
c
t
i
v
a
c
t
e
d
p
o
i
n
t
Figure 4.3.71 Motor overload protection curve (example: standard motor)
When using force cooled motors (Special inverter motor), thermal characteristics are independent of the motor
speed, set 08-05 = x1xxb.
When 08-05 = x1xxb, overload protection function is based on motor rated current for output frequencies between
6 and 60Hz. If the output frequency is less than 1Hz, the overload protection function uses 83% of the motor rated
current to determine an overload condition.
When 08-05 = x0xxb, overload protection function is based on 70% of the motor rated current for an output
frequency of 20Hz. If the output frequency is lower than 1Hz, the overload protection function uses 40% of the
motor rated current to determine an overload condition.
Motor overload rating at different output frequencies is shown at Figure 4.3.72.
