Installation Instructions

Section 5876 Installation Instructions
Issue AT, April 26, 2013 Spec. No. 582140000 (Models 802
NLDB, 802NLEB and 802NL-B)
Page 4-64 Chapter 4. Making Electrical Connections
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• The voltage of the New Power System must be set to the same level as that of the
Existing Power System.
• The remote sense, if used, of both the new and Existing Power System’s must be
connected to the same point.
• If batteries are used, they must be of the same type.
• All the functions specific to the Existing and New Power Systems and which depend
on the voltage or which act on the voltage must be disabled from the Existing and
New Power Systems (note that this is automatically done on the New Power System
when the Power Share feature is programmed). This includes...
• any equalization function,
• any temperature compensation function,
• any charge control function,
• any battery discharge test function, and
• any invalid current alarm.
Paralleling the Existing and New Power Systems
Refer to the following when a Spec. No. 582140000 Power System is to be operated in
parallel with an existing power system in the “Power Share” mode.
Preparing the Existing and New Power Systems
• Install and turn-up the New Power System as describe in these Installation
Instructions.
• Set the float voltage on both the existing and New Power Systems to the same level.
Temperature compensation functionality, if used, must be disabled on both power
systems.
Paralleling the Systems
• Connect the Positive Battery (Ground Return +48V) and Negative Battery (Supply
-48V) overhead busbars of the New Power System to the main charge busbars
(rectifier side of the shunt) on the Existing Power System. Size the cable for the
largest current between systems. Refer to Figure 4-26.
Note 1: The connections between the two power systems should be done with
power cables appropriately sized to be capable of carrying the maximum
current that can circulate between the two power systems.
Note 2: If the Existing Power System incorporates a main plant shunt, the
connections of the cables from the New Power System to the Existing
Power System shall be made on the main charge busbars (rectifier side of
the shunt).
Note 3: To compensate for voltage drop, it is recommended to connect the New
Power System’s remote sense leads to the same point of sensing as the
Existing Power System.
Note 4: There shall be only one battery return reference (BRR) cable for the two
power systems. If the cable is appropriately sized on the Existing Power
System, keep it as the BRR for both power systems. If the cable is not
appropriately sized on the Existing Power System, install a new BRR cable
and connect it preferably to the New Power System since the Existing
Power System may eventually be phased out.