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ADCP-80-570 • Issue 2 • March 2006
Page 4
© 2006, ADC Telecommunications, Inc.
• Rear protective input terminal covers (2) and output/alarm terminal cover (1)—Used to
prevent accidental contact with the alarm and power terminals.
•#6-32 Screws (4)—Used to fasten output/alarm terminal cover to rear of panel chassis.
• Designation card and card holder (1)—Used to record information about the protected
equipment. Cards and clear cover insert into the card holder.
• Voltage label (1)—Used to indicate whether the input voltage is –48 or –24 Vdc.
1.4 Power Buses
Each circuit breaker panel has two isolated power buses. Each bus distributes the input power to
the output power circuits. In each bus circuit, current flows from the input power bus, through
the circuit breaker, to the output power circuit. The current capacity of each bus is 45 Amps
maximum. Figure 3 is a block diagram of the power buses.
Figure 3. Circuit Breaker Panel Block Diagram
1
2
3
4
5
6
7
BATTERY RETURN
BATTERY A
RETURN A
POWER A LED
BREAKER
ALARM A LED
1
2
3
4
5
6
7
BATTERY RETURN
BATTERY B
RETURN B
BUS A
RETURN A
POWER B LED
ALARM RESET PUSHBUTTON
BREAKER ALARM B LED
BUS B
RETURN B
–24V/–48V
–24V/–48V
C
NO
NC
C
NO
NC
SYSTEM ALARM
CONNECTIONS
20691-A
FA
FB