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The aux relay has a special use when XR315s are ganged or cascaded together – this is covered
in the sections on ganged and cascaded systems.
6.1.4
Over-Ride Function
The XR315 has an over-ride function that can be used for fire safety and other applications
where the power must be held on or forced off. The over-ride function is programmable so that it
can be set to either force the unit off or force it on. When a signal is applied to the over-ride input
the unit will be forced on or off regardless of the main inputs.
If the unit has been forced off by an over-ride, the Over-Ride Restore menu option determines
whether the unit will power up again or remain off.
There is a special delay which can be used only with an over-ride condition. This allows a faster
turn-on (or turn-off). It is not recommended to use the special delay with expanded systems.
The over-ride input can be programmed to accept either a contact closure or applied dc voltage.
See section 3.2 for connection details and section 5.2 for programming details.
The over-ride input has a special use when XR315s are cascaded together. This is covered in the
section on cascaded systems. If an over-ride is required with a ganged system use the over-ride
input on the first XR315. If an over-ride is required with a cascaded system use the over-ride
input on the last XR315.
6.1.5
Other Functions
Reading through the programming section is a good way to understand all the functions and
options available in the XR315. Most of the functions are associated with main operation
outlined in this section above. However, there are some other independent functions that can be
selected:
The front panel button can be programmed to be operational, non-operational or operate after a
one-second delay. Choosing the last setting prevents accidental power-up or power-down. See
section 5.5 for more details.
The XR315 has built-in voltage limits that will cause the unit to power down if the line voltage is
outside these limits. The low limit can be set from 90V to 110V and the high limit can be set
from 130V to 150V. See section 5.6 for more details.
There are two “Restore” options. The first option allows the unit to restore to a power-on state
after loss of AC power or out-of-range AC voltage. The second option allows the unit to restore
to a power-on state after being forced off by an over-ride. See section 5.8 for more details.
