19
2
Installation and Start Up
Alpha Technologies
2.1
Site Preparation Checklist (Continued)
Load Size
•
If the load is over 2000VA (1600W), the intersection controller flash control
point
MUST
be connected to the “On Batt” part of the UPS terminal block.
When the line is unqualified, the energized contact inside the UPS causes
the intersection controller to flash the lights.
•
If the load is under 2000VA (1600W), you can connect the intersection con-
troller flash control point to either the “Timer” or the “Low Battery” portion
of the UPS terminal block.
The “Timer” contacts are energized two hours after the UPS goes into
Battery mode. The “Low Battery” contacts are energized when the battery
reaches 40% of capacity. Either one will cause the intersection controller to
flash the lights.
Or you can wire the flash control point to both, causing the lights to flash
whenever either condition occurs.
Grounding
The system must be correctly grounded for proper operation.
Older facilities may have inadequate electrical grounding. A qualified electri-
cian should inspect it before installation to see it meets the local electrical
code.
