Clary SP Series-Model PD - Manual (Page 14)

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
14
2 GENERAL CHARACTERISTICS
2.1 Characteristics
Overview
The Clary PD Series Traffic UPS is a turnkey, true on-line, power conditioner and battery backup
or uninterruptible power system (UPS) designed for the extreme environments found in traffic
cabinets (-40 to + 74 deg C).
The Clary PD Series, with its standard 41Ahr battery pack, is capable of operating, a full LED
intersection for over 2 hours at 700W (watts) output. A typical intersection consuming 450W can
be powered for approximately 4 hours. In Red-Flash operation, which consume only about 300W,
over 6 hours of backup is possible. These times assume fully charged batteries at the ambient
temperature of 25C .
Operation
The Traffic UPS is capable of producing – simultaneously -- full regenerated and regulated, true
sine wave power, with standby and continuous AC outputs. The Bypass Box is the link between
the utility power, the UPS power, and the loads.
When utility power is adequate, the UPS routes that power to the loads. Upon loss of utility power
the Traffic UPS routes UPS generated power to the loads. In the event of UPS failure and/or
battery depletion, the UPS will ensure that it will drop out and return to utility power when
available. The traffic control system will then default to normal operational mode.
The Bypass Box enables removal and replacement of the Traffic UPS without shutting down the
traffic control system (i.e. “hot swap” capability).
For 170 type cabinets, upon loss of power the Traffic UPS can actuate the existing Flash Transfer
Relays (FTRs), Mercury Contactor (MC) or Railroad Preemption to allow the traffic control system
to put the cabinet into Flash Mode operation.
Existing Flasher Modules and Flash Transfer Relays are utilized. The Traffic UPS does not
duplicate or take over flash operation or flash transfer relay functions.
The Traffic UPS is capable of providing continuous, fully regenerated, conditioned, regulated,
sinusoidal (AC) power to selected devices such as signal controllers, counters, modems,
communications hubs, NTCIP adapters, video equipment, etc.
To facilitate emergency crews and police activities, the Traffic UPS is compatible with police panel
functions (i.e. “Signals OFF” switch must kill power to the field wiring even when on UPS/Battery
power).