Fronius String Control 250/25 DCD DF - Manual (Page 86)

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Restoring the
energy supply
manually
(1) (2)
Jumper positions:
A Automatic restoration of the
energy supply
(factory setting)
M Manual restoration of the ener-
gy supply
The jumper (1) must be set to position M for manual restoration of the
energy supply.
- After a shutdown due to over-current or under-voltage, there are 2
options available to restore the energy supply manually:
a) Unplug and then plug in data communication cables from the RJ
45 IN and OUT connections
or
Disconnect and then reconnect multi-wire data communication
cables from the IN and OUT terminals.
If available, unplug the cable for an external energy supply
b) Cover the ‘PWROK’ LED for 0.5 - max. 2 seconds (e.g., with your
finger)
In order for the ‘PWROK’ LED to detect the darkness, certain
ambient lighting conditions are required. If the lighting conditions
onsite are inadequate, the LED will not react.
- After a shutdown due to over-current or under-voltage, the Fronius
String Control 250/25 tries to restore the energy supply in the Solar
Net every 5 seconds so long as there is a short circuit, for example.
- The ‘PWROK’ LED (2) flashes briefly every 5 seconds.
- When the power supply is reestablished the ‘PWROK’ LED lights up
green..
If there is no short circuit and the ‘PWROK’ LED does not light, then the
shutdown is due to under-voltage.
In this case, the DATCOM components require an external energy supply
via an external power supply unit.
Restoring the
energy supply
automatically
(continued)
The manual restoration option for the energy supply helps the installer
during Solar Net troubleshooting.