System Manual – MOVIDRIVE® compact Drive Inverters
227
4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Overload capacity of the inverter
Project Planning
Overload capac-
ity for an over-
load time < 1 s
In dynamic applications (CFC and SERVO operating modes) with a short overload time
t
1
, the inverter can output overload currents up to 150 % I
N
even at PWM frequencies of
8 kHz and 16 kHz.
The overload time t
1
must be less than 1 s for this high overload capacity to be
achieved.
Determining the
overload capacity
You have to determine the overload capacity for the short overload time (t
1
< 1 s) for
MC_4_A sizes 1 - 5 using diagrams (
→
following figure).
The mean inverter output current I
out RMS
during the load cycle must not exceed a
certain value.
The time axis is separate. The left part shows the overload time t
1
and the right part the
low-load time t
2
. The temperature profiles of the various low-load currents I
out 1
are
shown in a series of curves above t
1
. The temperature profiles of the various low-load
currents I
out 2
are shown in a series of curves above t
2
.
Example:
•
Following specifications:
– Overload current I
out 1
= 140 % I
D
– Overload time t
1
= 0.3 s
– Low-load current I
out 2
= 40 % I
D
– Low-load time t
2
= 1.0 s
•
At an overload time of t
1
= 0.3 s move vertically upwards until the point of intersection
with I
out 1
= 140 % I
D
.
•
Move horizontally to the right until the point of intersection with I
out 2
= 0.4
×
I
D
.
56729AXX
Figure 71: Sample overload diagram for short overload time
130 % I
D
140 % I
D
150 % I
D
60 % I
D
40 % I
D
20 % I
D
0 % I
D
0.13
0.3
!
✓
1
0.8
0.6
0.4
0.2
0
0.2
0.4
0.6
0.8
1
t1 [s]
t2 [s]
I
out 2
I
out 1
V
1
= 3 x AC 400 V
ϑ
amb
= 40 °C
f
PWM
(P860 / P861) = 8 kHz
I
out RMS
≤
65 % I
D
Summary of Contents for MOVIDRIVE compact MCH41A
Page 2: ...SEW EURODRIVE Driving the world...
Page 432: ......
