030-803-J0 Rev B
Page 13 of 26
6
Wiring and Connections
This chapter provides cabling details and notes on cable sizing for DC applications with respect to the Alpha
Cordex 24-3.1kW modular switched mode rectifier system.
6.1
Safety Precautions
WARNING
Hazardous AC voltages may be present. Ensure power at the AC service panel is off before
attempting work on the AC connections. Use a voltmeter to verify the absence of voltage. Clearly
mark the correct polarity of the battery leads before commencing work on DC connections.
Refer to the previous (Installation) chapter for additional safety precautions.
6.2
Tools Required
Various tools are essential for product installation. Use this list as a guide:
•
Philips head screwdriver, #1 (tip size 5/32”)
•
Philips head screwdriver, #2 (tip size 3/16”)
•
Slot head screwdriver (blade size 1/4”)
•
Digital voltmeter equipped with test leads
•
Adjustable 24Vdc load (optional)
•
Cutters and wire strippers (#10 to #22AWG) (6 to 0.34mm
2
)
•
Crimping tool (optional for large gauge wire)
•
Socket and rachet set (Imperial measure)
•
Anti-static wrist strap
•
Computer (laptop) with Microsoft
Internet Explorer 6 or greater
•
Crossover cable RJ-45 (for access using the Ethernet port).
6.3
Power System Chassis Ground and DC Ground Reference
WARNING
For safety reasons, ensure the system is properly bonded to the building’s ground grid.
Both the shelf chassis ground (via power system chassis ground) and common return shall be connected to the
site ground to ensure correct operation of the system and to prevent drifting floating analog (especially current)
readings.
6.4
AC Feeder Protection/Sizing
To maximize system reliability, each power module should be fed from a dedicated protection feeder breaker
located at the AC distribution panel. The feeder breaker can also act as the disconnect device for the connected
module. Refer to the specifications at the front of this manual for Alpha recommendations.
6.5
AC Input Connections
WARNING
Use care when removing or replacing the covers for the AC input connections. Never assume that
an electrical connection or conductor is not energized.
CAUTION: AC input wires should be routed in flexible or rigid conduit as far away as possible
from the DC power wires to minimize EMI disturbances.
Ensure all modules are removed from the shelf.
The wireway is designed for two customer-supplied 1” conduit fittings for AC supply located one on each side of
the shelf. Attach the conduit retainers to the wireway hole(s) and route the AC cables through. Secure the wires to
the AC input and chassis ground terminals as required (see below). Tighten the cable connector to the AC cable
(conduit similar).
