Operating the ACCB

The Bypass Switch

During normal operation (Figure 2-2 on page 2–3), AC power passes from the external AC source (generator or grid) through the inverter to the AC loads. The inverter monitors the incoming power and can keep the batteries charged.

When external sources of AC power are not available, the inverter switches to external DC power (e.g., batteries, generator, solar, wind, hydro fuel cell) and continues to power the load.

When performing inverter maintenance, the breakers can be switched to the Bypass Operation (Figure 2-3 on page 2–3) which allows the AC loads to be powered directly from the the external AC source without affecting connected AC loads.

To de-energize both circuits, switch the breaker pair to the OFF position (Figure 2-4 on page 2–4).

Operating the Bypass Switch

Once the AC voltage has been applied, the bypass switch is ready for operation. Under normal operation the Inverter Output breaker is ON.

There are three possible modes of operation for the bypass switch:

•“Normal Operation”

•“Bypass Operation”

•“AC Input/Output Off”.

ON

ON

ON

ON

ON

ON

60

 

 

60

 

 

 

60

60

 

60

60

OFF

OFF

OFF

OFF

OFF

OFF

INVERTER

INVERTER

INVERTER

INVERTER

INVERTER

INVERTER

BYPASS

DISCONNECT

BYPASS

DISCONNECT

BYPASS

DISCONNECT

BOTH OFF TO DISCONNECT AC OUTPUT

BOTH OFF TO DISCONNECT AC OUTPUT

BOTH OFF TO DISCONNECT AC OUTPUT

NORMAL OPERATION:

Left Breaker = ON

Right Breaker = OFF

Inverter AC power available to Inverter AC Distribution Panel

BYPASS OPERATION:

Left Breaker = OFF

Right Breaker = ON

Utility or Generator AC power available to Inverter AC Distribution Panel

AC OFF OPERATION:

Left Breaker = OFF

Right Breaker = OFF

Utility/Generator/Inverter AC power disconnected to Inverter AC Distribution Panel

Figure 2-1Bypass Switch Mode Summary

2–2

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