Lenze 8400 BaseLine Manual - Manual (Page 36)

Technical data
Overcurrent operation
Operation at rated mains voltage 500 V
4

36 EDS84ABD302 EN 4.0
4.3 Overcurrent operation
The controllers are designed for a time-limited overcurrent. The ”Ixt” protective function
protects the controller against impermissible overloads. The protective function monitors
the output current within two different time periods.
Definition of the cycles:
ƒ 15-s cycle c
– 3 s load period with peak current 
– 12 s recovery time with limited current 
ƒ 180-s cycle d
– 60 s load period with peak current 
– 120 s recovery time with limited current 
A load period with peak current must be followed by a recovery time. During the recovery
time, the current must not exceed the given value. The utilisation detected in the cycles
must not exceed 100% IaN8, otherwise a warning signal is displayed.
The given values refer to the rated output current I
aN8
.
t 0
100
2
0
1
I [%]
aN8
3
3 s 12 s 60 s 120 s

‚
8400IZ180
Fig. 4-1 Overcurrent capacity in 230/400 V operation at 45° C
 Peak current for 3 s
c 15-s cycle
 max. current in recovery time for 12 s
 Peak current for 60 s
d 180-s cycle
 max. current in recovery time for 120 s