12
2.7
Enabling/Disabling Ground Detection
Ground Detection is available on AUPS systems. The purpose of Ground Detection is to determine if the battery
or loads have become grounded. If the battery or loads are set up as floating, it is recommended that Ground
Detection be enabled. When Ground Detection is enabled, a positive or negative ground fault indicator will
energize upon detection of a ground. The Ground Detection circuitry monitors amount of ground current, and
whether it is positive of negative and will alarm when the threshold of 1.5mA is reached (or exceeded).
NOTE:
La Marche Mfg. Co. is primarily a manufacturer of battery chargers and not ground detection systems. If
a more precise system is needed, many ground detection systems are compatible with La Marche products.
AUPS systems are shipped from the factory with Ground Detection enabled by default. It is recommended that
Ground Detection be disabled if the battery or loads are either positively or negatively grounded. Additionally,
the AUPS will show a ground fault at all times if the system is known to be grounded and the Ground Detection
is enabled. If an external Ground Detection system is used, the AUPS Ground Detection must be disabled.
Ground Detection Procedure
Before making any changes to the AUPS, ensure that the AC power is off at the main breaker box, the DC
power is off, and that all of the system
’
s breakers are off. To enable or disable Ground Detection, first locate
the S2A-341S display/control board inside the system. Refer to figure below; all jumpers are located on the
back of the board.
To ENABLE Ground Detection:
•
Place jumper
JP5
•
Move jumper JP76/JP77 to
JP76
position
•
Move jumper JP78/JP79 to
JP78
position
To DISABLE Ground Detection:
•
Remove jumper
JP5
•
Move jumper JP76/JP77 to
JP77
position
•
Move jumper JP78/JP79 to
JP79
position
Figure 11
–
S2A-341S Digital Rectifier Control Board (Back View)
Summary of Contents for 7.5K-A1-BD3-125V100A
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