EFJohnson 3000 SERIES - Manual (Page 33)

SYSTEM RACK
4-7
4.2 FOUR SHELF 3000 SERIES SWITCH
The system rack is a framework for modules that
consists of up to 4-shelves with 13-slots per shelf. In
each shelf, 12-slots are for function modules and
1-slot is reserved for the power module. The power
supplies for the shelves are located in the lower
portion of the rack framework. The framework also
provides support for interconnection wiring, routed
between shelves, and external devices.
4.2.1 POWER CONSUMPTION
The following tables shows the average voltage,
current and power for each supply voltage per card
(based on loading of 48 cards).
Total watts including TIM-DID is 5.74W.
Excluding the TIM-DID provides a total of 4.3W for
normal modules. 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
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.
3.6 x Wattage of Power Supply = Btu/Hr.
EXAMPLE:
4.3W x 48 = 206W
206W
÷
0.7 = 295W
3.6 x 295W = 1,061 Btu/Hr
4.2.2 EQUIPMENT REQUIRED
•
Digital Multimeter, voltmeter resolution to 0.001V.
•
Transmission test set, HP 3551A.
•
IBM NT compatible computer, with Call Processor
Software.
•
Two CIMs (023-3039-035).
4.2.3 4-SHELF POWER SUPPLY
The Power Supply has a 115/230V AC 50/60 Hz
input and 4 continuous duty outputs as follows:
+5V DC 24A.
-5V DC 6A.
+12V DC 3A.
-12V DC 5A.
The power supply can handle 2-shelves and has
the following connections:
4 separate +5V 2A connections.
2 separate -5V connections.
2 separate +12V connections.
2 separate -12V connections.
6 separate ground connections.
4.2.4 POWER SUPPLY REDUNDANT PLATE
The power supply drawer can be made redundant
by the use of the redundant diode plate (PN 023-3039-
553). The redundant plate allows two power supply
drawers to share the load via diodes. One of the power
supply drawers may be removed and the remaining
drawer will supply the full load (see Figure 4-10).
Table 4-6 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.