Alpha Technologies AMPS80 HP - Manual (Page 41)

39 Doc. #: 026-069-B0 Rev F
5. System Installation
The AMPS80 HP system is pre-configured from the factory for a single AC feed per phase for inverters, a
maintenance bypass switch, and rectifiers if present.
The installer is responsible for connecting the following:
• Utility input to the system (120 V line to neutral)
• Battery strings
• System to the load
• Chassis and battery return to the reference ground
Reference Notes:
• If the AC input neutral is connected, remove the neutral to ground bonding wire. The neutral to ground
wire is provided for systems without AC Input connections in which case the inverter output is consid-
ered a separately derived source and the AC output neutral must be connected to earth ground.
• In a 3-phase system equipped with an internal maintenance bypass switch and a load with a significant
distortion power factor, it is strongly recommended to provide the AC input and AC output connection
with a double neutral feed. Non-power factor corrected IT power supplies with rectified-capacitive loads
can contain high levels of 3rd harmonics that are created in such 3-phase systems. The current in the
neutral line can easily be twice the current in the line currents.
• DC tie bars are supplied to allow dual A/B battery feed (DC1 tied to DC2 and DC3 tied to DC4) or single
battery feed (DC1 - 4 are tied)
• If the system is equipped with the optional rectifiers, each rectifier shelf in a hybrid system is only con-
nected to one of the DC- battery feeds: the top shelf to DC1, and the bottom rectifier shelf is connected
to DC4. In a system with four independent battery feeds, two of these battery banks will not be charged
from the AMPS80 HP rectifiers. When using two independent A/B feeds, DC1 should be tied to DC2 and
DC3 tied to DC4 at the AMPS80 HP DC connection points. Tie bars are provided.
* Connections and components relating to L3 are only present for 120/208 V, 3-phase systems.
** Connections and components relating to L2 are only present for 120/240 V split phase and 120/208 V
3-phase systems.