Clary SP170-PDA - Manual (Page 16)

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2 GENERAL CHARACTERISTICS
2.1 Characteristics
Overview
The Clary SP170-PDA 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 SP170-PDA, 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 .
UPS Operation
The Traffic UPS is capable of producing – simultaneously -- full regenerated and regulated, true
sine wave power, with standby and continuous AC outputs.
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.
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.
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).