Technical data – Lenze 8400 User Manual
Page 72
Technical data
Overcurrent operation
4
72
EDS84ASC552 EN 9.1
The curves of typical load functions and the simulation of the ”Ixt” function are shown in
the following illustration:
t
0
100%
1
0
2
I
[%]
aN8
T
2
T
3
T
4
T
1
8400IZ180
Fig. 4-2
Overcurrent capacity in 230/400 V operation at 45° C
Pulse load (15 s cycle)
Calculation equation:
Peak current
A ⋅ T
1
+C ⋅ T
2
T
1
+T
2
≦ 100%
Unloading current
T
1
Peak current period
T
2
Unloading current period
Permanent load (180 s cycle)
Calculation equation:
Peak current
B ⋅ T
3
+C ⋅ T
4
T
3
+T
4
≦ 100%
Unloading current
T
3
Peak current period
T
4
Unloading current period
I
aNx
Rated value of continuous output
current
15-s cycle
f = 2 kHz
f = 4 kHz
f = 8 kHz
f = 16 kHz
I
amax
/I
aN8
[%]
200
75
200
75
200
75
133
50
180-s cycle
f = 2 kHz
f = 4 kHz
f = 8 kHz
f = 16 kHz
I
amax
/I
aN8
[%]
150
75
150
75
150
75
100
50
Tip!
For calculations of application-specific cycles please contact your Lenze contact
person.