
Market Central, Inc.
R6000 AC POWER SWITCH Page 3of 6
2. Introduction
The R6000 AC Power Switch card is designed for use in the R6000 Automatic Switching System. The AC Power
Switch Card switches AC power from a common AC input connector to one of two AC output connectors. The unit
uses a low power, latching relay to switch the AC input voltage to the AC coil of the power relays. The power
relays connect the AC input to either output A or output B, switching both the HOT and NEUTRAL AC lines. The
de-energized state of the power relays connects the AC input to output A.
The AC Power Switch card is available in two versions. The standard version operates like any other A/B Switch
card in the R6000 Automatic Switching System. The switch can be controlled individually with the toggle switch
on the front of the card. It may be controlled as part of the rack or part of the system, by using the switches on the
front of the A/B Switch Controller. It may also be controlled with RS-232 terminal or SNMP commands with the
appropriate A/B Switch Controller.
The AC Power Switch with networked reporting has additional circuitry to detect AC power, and a processor to
make that information available to a SNMP monitoring station. The AC detection circuit monitors the AC input
power after the circuit breakers. In order to access this SNMP information, the AC Power Switch must be installed
in a R6000 rack with a Processor Version of the A/B Switch Controller, and the first rack in the system must have an
A/B Switch Controller with SNMP.
Please refer to the R6000 Automatic Switching System manual for more information on the A/B Switch Controller,
and other A/B Switch cards.
The Power A/B Switch is designed for switching 120 or 240 VAC loads, up to 15 Amps. Contact the manufacturer
for alternate loads.
3. Configuration
The AC Power Switch uses AC coil power relays, and therefore must be set as appropriate for 120 or 240 VAC. The
AC voltage selection switch will be set at the factory prior to delivery. It should not be necessary to change the
switch setting. The AC voltage selection switch is located in the center of the card, beneath a protective insulator.
Using the AC Power Switch with the improper voltage may result in damage to the power relays. Remove all power
connections prior to removing the AC Power Switch from the rack. See the installation section for procedures to
install and remove the AC Power Switch cards from the rack.
Table 3.1–AC Voltage Selection Switch SW4
Switch Position Function
Toward AC Connectors 120 VAC operation
Away from AC Connectors 240 VAC operation
The R6000 Automatic Switching System is designed to accommodate up to 16 A/B switches. The standard A/B
switch cards can be individually addressed with RS-232 terminal or SNMP commands. The switch card address is
determined by the position in the rack, and the rack address, which is set on the controller card. Valid rack
addresses range from 0x01 to 0xFF hex (1 to 255 decimal). Valid card addresses range from 1 to 4080. Cards 1
through 16 are in rack 1, and cards 17 through 32 are in rack 2 and so on. The controller card provides control and
status information for all 16 cards in the rack. Since the AC Power Switch cards occupy two card slots, every other
card slot will be unused. The status of an unused slot is B. The “rack” status will be A if any of the switch cards in
the rack are at A, and will be B only if all the installed switch cards in the rack are at B.