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787-3861/108-020
Undervoltage detection: If the voltage falls below 18 V during operation, the status LED
flashes red/yellow at 1 Hz, and the channel trips to protect the downstream load. If the
voltage returns to the nominal range (20 ... 30 VDC) within 60 seconds, the channel is
switched back on, and the status LED lights up green.
If the voltage drops below 18 VDC for more than 60 seconds, the channel is not switched
on after the voltage returns to the nominal range, and the status LED lights up red.
The product is protected against brief voltage dips that may occur in the supply network.
For this purpose, a dead time of a few milliseconds is implemented, which ensures that
the product does not trip inadvertently in such a situation.
Overvoltage detection: If the input voltage of the product rises above 30 VDC, the sta-
tus LED flashes red/yellow at 5 Hz, and the channel trips to protect the downstream load.
If the voltage returns to the nominal range, the channel is automatically switched back on,
and the status LED lights up green.
The following table refers to the Sprungziel: Zustände from the status table.
Output Status
Status 1
Status 2
Status 3
Status 4
Status 6
4.3 Capacitive Load
The product can be used to switch on high capacitive loads. The resulting high inrush
currents put a strain on the power supply. The power supply must be able to deliver the
maximum required power without the voltage falling below 20 VDC.
The capacity value to be reached depends on fundamental factors, such as the power
supply already mentioned, the cable length and the conductor cross-section, as well as
the properties of the load that is to be powered.
For some WAGO power supply units, possible load capacities have been determined em-
pirically (see
Note
Measures for capacitive loads without protection against reverse discharge
Faulty tripping of channels that are connected in parallel may occur on the supply side
with capacitive loads that are not protected against reverse discharge.
•
In this case, WAGO recommends taking suitable measures (e.g., a diode or MOS-
FET) to decouple the capacitive load.
Product manual | Version: 1.0.0
Electronic Circuit Breaker
Product Behavior in the Event of
Undervoltage
Overvoltage
Status 8
Status 9
Status 8
Status 9
Status 7
Status 9
Status 8
Status 9
Status 8
Status 9
8 Power Supplies
[} 38]).
Table 14: Undervoltage and Overvoltage Detection
Product Behavior When Voltage Returns
to Normal
Undervoltage
Overvoltage
Status 1, 2 or 3 (de-
Status 1, 2 or 3 (de-
pending on load cur-
pending on load cur-
rent)
rent)
Status 1, 2 or 3 (de-
Status 1, 2 or 3 (de-
pending on load cur-
pending on load cur-
rent)
rent)
Status 7
Status 1, 2 or 3 (de-
pending on load cur-
rent)
Status 4
Status 4
Status 6
Status 6
Functions
23
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