Evaluation of UPS for Intersection Traffic Signals with LED: Findings for Myers PB-1250PC UPS

Chitturi, Madhav V.; Benekohal, Rahim F.

Permalink

https://hdl.handle.net/2142/46274 Copy

Description

Title

Evaluation of UPS for Intersection Traffic Signals with LED: Findings for Myers PB-1250PC UPS

Author(s)

• Chitturi, Madhav V.
• Benekohal, Rahim F.

Issue Date

2003-12

Keyword(s)

Uninterruptible Power Supply for Intersections, UPS, Intersection Traffic Signals, LED Signal Modules, Battery Back up System for Traffic Lights, BBS.

Abstract

Uninterruptible Power Supply (UPS) systems are used to power the intersection traffic signals that have Light Emitting Diode (LED) signal modules, in case of a power failure. The objective of this study was to test the PB-1250PC UPS manufactured by Myers Power Products and verify if it meets the Illinois DOT’s specification for UPS. Multiple tests with full load (approximately 700 W) and partial loads (flashing reds with about 350W) were conducted at room temperature to determine charge and discharge times. The time to fully charge the batteries was on average 14hrs 17min. The UPS powered a full load for 2hrs 15mins. When powering a full load, the UPS took 1hr 8min to reach 40% battery level. After reaching the 40% level, the UPS powered the flashing reds for 1hr 46min. Myers PB-1250PC UPS meets the majority of the IDOT Specification requirements. It has three major and some minor shortcomings that can be corrected to satisfy all IDOT Specification requirements. The major shortcomings of this model are: the model does not have a NO and NC contact closure for indicating inverter/charger failure: the manufacturer gives a 48 hr burn-in period to each unit instead of 100 hrs required by IDOT specification, the fan in the battery cabinet runs on 48VDC instead of AC power.

Series/Report Name or Number

FHWA-IL/UI-TOL-7

ISSN

0917-9191

Type of Resource

text

Language

en

Permalink

http://hdl.handle.net/2142/46274

Sponsor(s)/Grant Number(s)

The Illinois Department of Transportation

Copyright and License Information

No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161

Owning Collections