User Manual Chapter 2
GFK-2749A Jan 2020
Installation 24
2.5.4 Relay Connector for Sync Contacts
The Sync contacts are two redundant, isolated solid-state outputs that signal when it is safe
to close the contacts that will parallel Grid 1 to Grid 2. When the PSM module determines
that the synchronization parameters have been met, relay contact 1A closes to relay contact
1B, and relay contact 2A closes to relay contact 2B. These outputs can carry either AC or DC
signals. In DC systems, the outputs can either be high-side (sourcing) or low side (sinking)
outputs. Since these are isolated outputs, the two relays can be connected either in series
or in parallel, depending on the needs of a specific installation. Connecting the contacts in
parallel does not increase the current carrying capacity of the system.
If safety is the primary concern for a given installation, connect the relays in series,
increasing reliability of breaking the connection when synchronization is no longer desired.
If reliable power is the primary concern for a given installation, connect the relays in parallel,
increasing the reliability of making the connection when synchronization is desired.
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