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SYS POWER SUPPLY UM E
3.15.1
Fold-Back Characteristic
Power supply units with fold-back characteristic are electronically protected against
overload and short circuit. The maximum output current is typically 1.1 times the nominal
current. In the event of an overload the working point passes along the curve shown in
Figure 3-26. Depending on the controller temperature and in the event of a short circuit the
device output is switched off to be protected against high currents.
Overcurrent
U out [V]
range
24
I out [A]
I N
1.1 x I N
5598D017
Figure 3-26
Fold-back characteristic
After approximately one second the device tries again to start the connected load. This
procedure is repeated until the overload or short circuit has been removed.
The power supply unit will not start the load in the event of an overload, which is caused
by the high inrush current during starting up when using heavier loads. If these devices
switch off too quickly in the event of a short circuit, secondary fuses will not blow. The faulty
current path cannot be isolated from the remaining system parts. This results in a failure of
the entire system.
3-40
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