
Operation
Controls, LEDs, and ports on the front panel
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  | Redundant Switch  | 
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  | APC recommends the factory default settings  | |||
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  | among the settings shown below.  | |||
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  | Function | 
  | LED Display | Description | |||
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  | Source A  | 
  | Bright= Normal  | 
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  | Sensitivity  | 
  | Dim (the factory  | Sets transfer  | |||
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  | sensitivity to line  | ||
  | Source B  | 
  | default) = Reduced  | ||||
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  | conditions  | |||||
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  | Sensitivity  | 
  | Off = low  | 
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  | Bright = Source A  | 
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  | Source  | 
  | (the factory default)  | Selects the preferred  | |||
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  | Preference  | 
  | Dim = Source B  | AC source  | |||
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  | Off = none  | 
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  | Source A  | 
  | Bright = Narrow  | 
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  | Xfer  | 
  | Sets the transfer  | ||||
  | Voltage  | 
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  | Dim = Medium (the  | voltage window (the  | ||||
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  | Source B  | 
  | factory default  | range of acceptable  | |||
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  | voltage)  | ||||
  | Xfer  | 
  | Off = Wide  | ||||
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  | Voltage  | 
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APC Redundant Switch: Installation and Operation Manual  | 15  |