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SYS POWER SUPPLY UM E
Early error detection
Power supply units with function monitoring are always used if maximum system
availability and minimum downtimes are important. Load errors, which may lead to power
supply unit overload, can often only hardly be localized. In the worst case, they cannot be
localized at all. On a long-term view, this can lead to expensive system downtimes, which
are difficult to maintain. The solution is an early error detection called preventive function
monitoring.
U out
24 V
21.6 V
DC OK
Early error detection
10%
Signaling threshold value
Typichal switch-off value of
Nominal range
I N
Power
Boost
I Boost
electronic control systems
Overload
I out
5598D305
Figure 3-14
Early error detection with power boost and DC OK
Figure 3-14 shows the U/I characteristic curve of a power supply unit with power boost and
preventive function monitoring. If the power boost is fully consumed the overload of the
power supply unit caused by the load results in the output voltage falling down.
Overload may occur slowly or sporadically if, for example, the power consumption of
solenoid valves increases due to more and more dirt on the valves. Incorrect system
expansion leads to permanent overload of the power supply unit.
A signal is indicated if the output voltage falls below the signaling threshold value. The
lower voltage value for typical loads, e.g., PLC, is between 18 V and 20 V. When the
signaling threshold value is reached (e.g., 21.6 V for an output voltage of 24 V) the PLC is
still supplied with adequate voltage. Evaluation of the signal outputs helps to respond to
load errors early and prevent a total system failure.
3-16
PHOENIX CONTACT
5598_en_03
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2938860-2 制造商: 功能描述: 制造商:undefined 功能描述:
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