Lenze 8400 motec - Overcurrent Operation

Technical data
Overcurrent operation
4
l
49
EDS84DG752 EN 7.0
4.4 Overcurrent operation
If the device utilisation Ixt exceeds the threshold set (C00064/1, Lenze setting = 100 %),
the monitoring function triggers an error response and sets the controller to the "Fault"
device status. To exit the device status, the error must be reset ("acknowledged") explicitly.
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 [%]
aNx
T
2
T
3
T
4
T
1


8400IZ180
Fig. 4−1 Overcurrent capacity at 45° C

Pulse utilisation (15 s cycle)
0 Peak current
2 Unloading current
T
1
Peak current period
T
2
Unloading current period
 Permanent load (180 s cycle)
1 Peak current
2 Unloading current
T
3
Peak current period
T
4
Unloading current period
I
aNx
Rated value of continuous output current
Calculation for pulse utilisation 
Output frequency >5Hz Output frequency <5Hz
E84DGDVB3714...7524 E84DGDVB3714...1524 E84DGDVB2224...7524
A @ T
1
)C @ T
2
T
1
)T
2
x 100%
A @ T
1
)C @ T
2
T
1
)T
2
x 75%
A @ T
1
)C @ T
2
T
1
)T
2
x 50%
Calculation for permanent utilisation 
Output frequency >5Hz Output frequency <5Hz
E84DGDVB3714...7524 E84DGDVB3714...1524 E84DGDVB2224...7524
B @ T
3
)C @ T
4
T
3
)T
4
x 100%
B @ T
3
)C @ T
4
T
3
)T
4
x 75%
B @ T
3
)C @ T
4
T
3
)T
4
x 50%