Franklin Electric SubDrive Solar Manuel D'installation page 9

When the system is running on back-up AC power, the drive will shut down for a few seconds
every 30 minutes to check the primary DC input terminals for sufficient power. If the primary DC
power is available, it will switch sources and attempt to run on DC. If the primary power is still
insufficient during this check, it will resume running on back-up AC power.
Call For Generator Dry Contacts
The SubDrive Solar controller has a set of dry contacts that can be used as a "Call for Generator"
function. There are three flag terminals inside the controller, two of which must be used.
NO – normally open; NC – normally closed (choose NO or NC based upon switch being used
or common state desired) and COM which is the common. These flag terminals are located in
between the AC terminal connections and the RUN/STOP/TRIP terminal connections.
When the drive no longer has adequate DC power it will then look for power at the AC terminal
block. At the same time, the state of those contacts changes (one will open, the other will close
based upon which contact terminal is used). This can then be read by an external switch. This is
not a powered contact, it only either opens or closes a circuit. In order to recognize this change
a switch controller with an independent power source must be utilized (for example an external
battery that can be charged once a generator is turned on).
Shown below is the state of each of the dry contacts (NO, NC) in the two operating modes.
Adequate DC Power
NO = Closed
NC = Open
Inadequate DC Power
NO = Open
NC = Closed
To start a back-up AC generator through a closed circuit, use the NC (Normally Closed) and the
COM (Common) dry contact flag terminals.
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