Alpha Technologies AMP24 HP - Manual (Page 38)

Doc. #: 0260011-J0 Rev B 36
5. Installation
The AMPS24 is designed for installation in a controlled environment, sheltered from rain, excessive
moisture, dust and other contaminants. Mount the AMPS24 HP system in 19" or 23" rack – front or
mid-mount – that is securely bolted to the floor.
The system arrives pre-wired, and the installer is responsible for connecting the following:
• Utility input to the system (120 V line to neutral)
• Chassis and battery return to the reference ground
• Battery strings
• System to the load
5.1 Input/Output Cabling
The illustrations in the following sections show the locations of the AC input and output, and DC
connection points:
• Connection points are accessed from the back of the system.
• AC wires enter the cabinet through the AC box at the back (section 5.2).
• DC wires enter the cabinet through the DC box at the back (5.3).
Reference Notes:
The AMPS24 HP system is pre-configured from the factory for a single AC feed per phase for
inverters, an internal maintenance bypass switch, and rectifiers if present.
• 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 considered 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, created in such 3-phase sys-
tems. The current in the neutral line can easily be twice the current in the line currents.
The required gauge of the AC input, DC+/DC- input and AC output cabling is determined by the
current rating, circuit breaker rating, typical ambient temperatures and the applicable local electrical
codes. Typically the AC input and standard AC output is 6 wires (L1, L2, and L3, N, N, G) up to
2/0 THHW or RW90 type cable that connects to the AMPS24 HP system with trade size up to 2.5"
conduit.
Refer to the appropriate model in the following sections for specific AC input and output connection
terminal torque specifications.
• Section "3.5 120V Single Phase Systems" on page 22
• Section "3.6 120V/240V Split Phase or 120/208V 2-Pole Systems" on page 25
• Section "3.7 120V/208V 3-Phase Systems" on page 28