Manx SA7x Installationsanleitung PDF herunterladen (Seite 81)

3.23 BUS/OFF/ON Switch (S1)

• OFF position—Removes ac power from the power controller output

receptacles and prevents the power controller from responding to power

control bus signal.

• ON position—Applies ac power to ac outlet receptacles. Power control bus

request signal is ignored. Power control bus inhibit signal is valid.

3.24 Power Control Bus (Front Panel J10, J11)

WARNING

Do not rely on the Digital power control bus to isolate hazardous

voltages from the system. Use the circuit breaker to isolate all

hazardous voltages.

The power control bus both supplies and detects signals in response to sensors

and a master switch. Connections to the Digital power control bus are made

through the use of Digital power bus cables (Digital part number 7008288–0–

0). Pin 1 is the power request (requests ac power when the state of Pin 1 is

low), Pin 2 is the power inhibit (inhibits ac power when the state of Pin 2 is

low), and Pin 3 is the return (the states of Pin 1 and Pin 2 referenced to Pin 3,

not to ground). Use Table 3–6 to determine bus logic.

Table 3–6 Power Control Bus Logic Table

(Pin 1) (Pin 2) (Switched AC Power)

High High OFF

Low High ON

High Low OFF

Low Low OFF

Note

The number of bus controls attached to the power control bus must not

exceed 40.

Preparation and Installation 3–39

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Manx SA7x Installationsanleitung Seite 81