POWER SUPPLY

SECTION 22 POWER SUPPLYFigure 22-1 POWER SUPPLY
22.1 INTRODUCTION

The Switch may be powered by different types of power e.g.:

110V AC Single Phase

230V AC Single Phase

A power supply may be removed and installed while power is applied to the Switch provided the Switch is equipped with a Redundant Supply.

See Section 4 for a wiring diagram of the power supplies.

22.2 POWER CONSUMPTION

The wattage required by the power supply is found by dividing the total wattage of the terminal by the efficiency of the power supply (0.7).

Terminal Power ⎟ 0.7 = Wattage of Power Supply

The BTUs per hour are found by multiplying a known value (3.6) by the wattage required by the power supply.

3.6x Wattage of Power Supply = BTU per hour

EXAMPLE:

4.3W x 72 = 310W

310W ⎟ 0.7 = 443W

3.6 x 443W = 1,595 Btu/Hr

The following tables shows the voltage, current and power for each supply voltage per card (based on loading of 72 cards).

Total watts including TIM-DID is 5.74W. Excluding the TIM-DID provides a total of 4.3W for normal modules. The following formulas are used to find the BTUs per hour.

The total wattage of the terminal is found by multiplying the wattage of a module by the number of modules.

Total Watts x No. of Modules = Terminal Power

Table 22-1

AVERAGE VOLTAGE/CURRENT/

 

 

POWER

 

 

 

 

 

Voltage

 

Current

Power

 

 

 

 

+5V DC

 

0.50A

2.50W

+12V DC

 

0.10A

1.20W

-12V DC

 

0.05A

0.60W

-48V DC

 

0.03A*

1.44W

 

 

Total

5.74W

* DIDs only.

 

 

 

22-1