ADC PowerWorx Power Distribution Products - Manual (Page 13)

ADCP-80-545 • Issue 3 • March 2006
Page 7
© 2006, ADC Telecommunications, Inc.
1.12 Ground Connections
Two #10 studs (with nuts and captive washers) are provided on the rear side of the circuit breaker
panel for grounding the chassis. The ground connection is used to attach grounding cables to the
chassis. Two 10 AWG copper wires are recommended for the grounding cables. Two #10 ring
terminals for use with 10 AWG wire are provided for connecting the grounding cables to the
grounding studs.
1.13 Alarm Operation and Connections
The Select Series circuit breaker panel contains circuitry that opens and closes a set of form C
relay alarm contacts when a circuit breaker trips or when power to either power bus is lost.
These contacts may be used to open or close a loop connected to an external alarm system.
During normal operation (power applied), the normally open (NO) contacts remain open and
the normally closed (NC) contacts remain closed. When a circuit breaker trips or when power to
a power bus is lost, the NO contacts close creating a connection between NO and common (C)
terminals; and the NC contacts open creating an open circuit between NC and C terminals. The
rating for the alarm relay contacts is 110 Vdc/125 Vac maximum voltage, 1.0 Amp maximum
switching current.
Both screw-down terminals and wire-wrap pin terminals are available (option) for the alarm
terminal connections. Two sets of alarm contact connections are provided when the panel is
equipped with screw down terminals and three sets of contact connections are provided when
the panel is equipped with wire-wrap pins. The alarm terminals are labeled ALARM and are
located on the rear side of the panel.
The screw-down terminal connections consist of six 3-48 screw terminals mounted in a barrier
type terminal block. The screw terminals are mounted on 0.250 inch (6.350 mm) centers with a
maximum distance between barriers of 0.20 inch (5.08 mm). Two sets of three terminals
(labeled NO, C, and NC) are provided for connection with external alarm systems. The screw-
down terminals will accept #16 to #30 AWG copper wire.
The wire wrap pin terminal connections consist of nine wire-wrap pins mounted in a terminal
block. Three sets of three wire wrap pins (NO, C, and NC) are provided for connection with
external alarm systems. The wire wrap pins will accept #22 to #26 AWG copper wire.
1.14 LED Indicators
Two power indicators (green LED) are provided on the front side of the panel. A separate
power indicator is provided for each of the two power output buses (A and B). The power
indicators stay on as long as power is supplied to the corresponding power bus. The power
indicators turn off when power is turned off to the corresponding power bus. Each power
indicator LED can be field-replaced if it fails.