Clary SP Series-Model PD - Manual (Page 7)

T H E C O N T I N U O U S P O W E R C O M P A N Y
7
When utility power returns, (or upon application of generator power) the PD Series UPS waits 30
seconds to be sure that the utility power has stabilized. After this built-in safety delay utility power
is restored to the cabinet. The battery charger then recharges the batteries in typically 10 to 20
times (depending on the load) the duration of the outage or battery discharge time (whichever is
shorter).
The UPS can be set to force a break in power of 2.5 seconds after utility power returns. This is
optional (not the default) and is used in intersections when a hard-restart needs to be applied to
various devices when returning from flash.
With Standby operation, the ONLY required change to cabinet wiring occurs by the introduction of
the Bypass Box. Removal and Replacement (R&R) of the UPS module is quick and easy even
with traffic control devices (TCD’s) connected to the UPS. If no TCD’s are plugged into the UPS
module (i.e. being used for LED flash backup only), R&R of the UPS module (for upgrades or in
the rare event of UPS failure) can be done without powering down the cabinet or otherwise
affecting cabinet operation in any way.
Continuous Operating Mode (ONLINE):
Continuous operation is used for low power applications such as full LED intersections, power to
the intersection is continuously conditioned and backed up by the UPS. Within the limitation of
the battery capacity, virtually all brownout and power outages are eliminated.
SP1250PD (PLUS) OPTIONAL
The PLUS has an extended load option that will allow 1400watts peak load for ten seconds. This
option allows for support of intersections that have not yet replaced the yellow incandescent traffic
lamps.
Additional Notes on Operating Modes:
• The PD Series Traffic UPS is designed for compatibility with, and complete transparency
to, all traffic signal cabinet functions including police panel operation.
RELAY CONTACTS:
The UPS includes six (6) or eight (8) sets of normally-open (NO) and normally-closed (NC) relay
style contacts. The contacts are intended to connect to the Flash controllers or other devices in
the traffic cabinet. The contacts are actuated at various times as a means of signaling these
devices of important aspects of current operation. These relays can be programmed from the
Front Panel LCD Display. You can set any of the relays to a certain condition listed in Table 11.
See section 4.10 for programming instructions.