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3.22 Power Controller Indicators

Table 3–5 Controls and Indicators

Control or Indicator Function

CB circuit breaker Provides overload protection for the eight

output receptacles and control circuit.

BUS/OFF/ON switch Controls ac power to the eight ac outlets

and selects remote operation.

BUS position Enables remote control of ac power via the

Digital power control bus connectors.

OFF position Removes ac power from the power

controller output receptacles and prevents

the power controller from responding to

power control bus signals.

ON position Applies ac power to ac outlets receptacles.

Power control bus request signal is ignored.

Power control bus inhibit signal is valid.

EXTERNAL SENSE connector 2-pin on rear of

controller (only 887–C)

Isolates ac power from the output

receptacles. The circuit then must be

reset for normal operation by cycling the

circuit breaker off and then on.

Power control bus (3-pin) Provides a means of controlling the power

state of a system from remote locations. A

switch closure between Pins 1 and 3 will

supply ac power to the output receptacles.

A switch closure between Pins 2 and 3 will

isolate ac power.

Sequenced power control bus (3-pin) Adds a 0.5 to 2.0 second delay to the power

request line (pin 1).

Fuse Protects the ac bus from control circuitry

overload.

3.23 BUS/OFF/ON Switch (S1)

The three positions of this switch are BUS, OFF, and ON. When the circuit

breaker to the power controller is ON, this switch controls to the ac outlet in

the following ways:

• BUS position—Enables remote control of ac power via the Digital power

control bus connectors. The BUS position is intended for remote sensing

of Digital power control bus instructions. This position requires the use of

a remote sensing cable not shipped with the power controller. If you don’t

have this cable, or your application does not require the use of the Digital

power control bus, leave the switch in the ON position.

3–38 Preparation and Installation

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