Vertivâ„¢ NetSureâ„¢ Control Unit (NCU) User Manual
• The float voltage, equalize voltage, and battery test voltage of the NCU power system must be set to the same levels as that
of the existing power system.
• The remote sense, if available and connected, of both the NCU power system and existing power system 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 power system and NCU power system and which depend on the voltage or which act
on the voltage must be disabled from the existing power system and NCU power system. This includes the following…
a) any equalization function,
b) any temperature compensation function,
c) any charge control function,
d) any battery discharge test function, and
e) any invalid current alarm.
In lieu of this, if battery charging and battery test functions are implemented in the existing power system, they can remain if signals
for starting are connected from the control system of the existing system to the NCU system.
Paralleling the Existing and NCU Power Systems
Important Safety Instructions
General Safety
DANGER! YOU MUST FOLLOW APPROVED SAFETY PROCEDURES.
Performing the following procedures may expose you to hazards. These procedures should be performed by qualified
technicians familiar with the hazards associated with this type of equipment. These hazards may include shock, energy,
and/or burns. To avoid these hazards:
a) The tasks should be performed in the order indicated.
b) Remove watches, rings, and other metal objects.
c) Prior to contacting any uninsulated surface or termination, use a voltmeter to verify that no voltage or the expected
voltage is present. Check for voltage with both AC and DC voltmeters prior to making contact.
d) Wear eye protection.
e) Use certified and well maintained insulated tools. Use double insulated tools appropriately rated for the work to be
performed.
AC Input Voltages
DANGER! This system operates from AC input voltage capable of producing fatal electrical shock.
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