Lenze 8400 motec Manual - Manual (Page 40)

Technical data
Overcurrent operation
4
l
40 EDS84DG752 EN 4.0
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 [%]
aN8
T
2
T
3
T
4
T
1

‚
8400IZ180
Fig. 4−1 Overcurrent capacity at 45° C

Pulse load (15 s cycle) Calculation equation:
0
Peak current A
@ T
1
)C @ T
2
T
1
)T
2
x 100%
2
Unloading current
T
1
Peak current period
T
2
Unloading current period
‚ Permanent load (180 s cycle) Calculation equation:
1 Peak current B
@ T
3
)C @ T
4
T
3
)T
4
x 100%
2 Unloading current
T
3
Peak current period
T
4
Unloading current period
I
aNx
Rated value of continuous output
current