Reso 2007-1103 - Laserfiche WebLink

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i `! (b) The power source furnished shall be of sufficient size so as to provide the required maximum load energy plus 25 %. (c) The electrical system shall meet the National Electrical Code where applicable. (d) A lightning protection device shall be provided for stationary equipment. (e)'The engine shall have an electrical starting system. (f) A backup power system shall be provided that will operate the unit for a minimum of three hours automatically when the motor driven generator fails to operate. (g) An automatic charging system to recharge the starting and backup power supply batteries, when the generator is operating. (h) The engine shall be supplied with an ammeter and the generator shall be supplied with a voltmeter showing voltage to the sign assembly. For solar powered units the following shall apply: (a) The photovoltaic unit of the 7 foot by 10 foot [2.1 by 3 ml PCMS shall be designed to provide 21 days of continuous operation without sunlight with a minimum of on site maintenance. The photovoltaic unit of the 5 foot by 8 foot [1.5 by 2.4 m] PCMS shall be designed to provide 12 days of continuous operation without sunlight with a minimum of on site maintenance. (b) Automatic recharging of power supply batteries shall be provided. 990 -4.5 Battery Life Test: (a) The battery shall be equipped with a battery controller to prevent overcharging and over - discharging. An external battery level indicator shall be provided. (b) The battery, controller, and power panel shall be designed to be protected from the elements and vandalism. 990 -4.6 Controller: (a) Controller and control panel shall be housed in a weather, dust, and vandal proof lockable cabinet. (b) The keyboard shall be equipped with a security lockout feature to prevent unauthorized use of the controller. (c) The controller shall be solid state in design and function. (d) The control panel shall display a representative message that will be displayed on the sign panel. (e) The flash rate shall be adjustable in the sign controller from one to ten seconds. 990 -4.7 Operation and Performance: (a) The message shall be displayed in upper case except when lower case is project specific and is allowed by the MUTCD. (b) The message matrix panel shall be visible from 1/2 mile [0.8 km] and legible from a distance of 650 feet [200 m] under both day and night conditions. Under variable light level conditions the sign shall automatically adjust it's light source so as to meet the 650 feet [200 m] visibility requirement. The message panel shall have adjustable display rates, so that the entire message can be read at least twice at the posted speed. (c) The control panel shall have the capability to store a minimum 50 pre- programmed messages. March 2007 01000 -204 03- 4122.D