+I Test Point

Rectifier Current can be measured with a

 

voltmeter between COM and +I. Current is

 

10A/V multiplied by test point voltage.

 

 

Float / Boost/Equalize Switch

Used to Control voltage on systems without a

 

PSCU

 

 

Float Trim Pot

The float pot is used to adjust the default float

 

voltage (27.2 Vdc).

 

 

Boost/Equalize Trim Pot

The boost/equalize pot is used to adjust the

 

default boost equalize voltage (28.8 Vdc).

 

 

Power Shelf Control Unit

 

 

 

Major (Red)

On when Major Relay is de-energized*

 

 

Minor (Yellow)

On when Minor Relay is energized

 

 

Normal (Green)

On when no alarms are active

 

 

ALM 1 (Red)

On when Output Relay 1 is energized

 

 

ALM 2 (Red)

On when Output Relay 2 is energized

 

 

ALM 3 (Red)

On when Output Relay 3 is energized

 

 

ALM 4 (Red)

On when Output Relay 4 is energized

 

 

ALM 5 (Red)

On when Output Relay 5 is energized

 

 

ALM 6 (Red)

On when Output Relay 6 is energized

 

 

MIN (Red)

On when Minor Relay is energized

 

 

MAJ (Red)

On when Major Relay is de-energized*

 

 

*This will allow the Major to activate even when all power is lost.

MX28B400 +24 VDC User’s Manual

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Page 49
Image 49
American Power Conversion MX28B400 user manual Pscu, Power Shelf Control Unit