Alpha Technologies CXPS 48-1.8-M2, 48V Pos Gnd - Manual (Page 31)

Argus Technologies Ltd. 053-991-C0 Rev A WC
Printed in Canada. © 2008 Argus Technologies Ltd. ARGUS and CORDEX are trademarks of Argus Technologies Ltd. All Rights Reserved. Page 17 of 28
5.4 Calculating Output Wire Size Requirements
Wire size is calculated by first determining the appropriate maximum voltage drop requirement. Using the formula
below calculate the CMA wire size requirement. Determine the size and number of conductors required to satisfy
the CMA requirement.
CMA = (A x LF x K) / AVD, where:
CMA = Cross section of wire in circular MIL area
A = Ultimate drain in amps
LF = Conductor loop feet
K = 11.1 constant factor for commercial (TW type) copper wire
AVD = Allowable voltage drop
Check again that the ampacity rating of the cable meets the requirement for the installation application. Consult
local electrical codes (NEC, CEC, etc.) for guidelines. If required, increase the size of the cable to meet the code.
5.5 DC Output Connections
WARNING
Leave cables or bus bars disconnected at battery and verify output polarity using a voltmeter.
Make battery connections only after all other wiring is completed.
DC output wire shall be UL approved XHHW or RHH/RHW (for Canadian users, RW90 Type). Control and sense
wires shall be UL approved Style 1015 (for Canadian users, TEW type).
Terminate cable leads with appropriate crimp lugs.
Secure the positive and negative to the shelf output post of the correct polarity; i.e., +Vcable to +Vpost. Ensure
the washers are on the bolts in the same order in which they were shipped from the factory.
The common output leg of the rectifier system should be connected to ground. This is typically done at the load
common termination point.
5.6 System and Battery Connections
WARNING
Ensure the correct polarity is used for all cable terminations.
Refer to guidelines supplied with the load equipment. Typically distribution cables are sized to provide a 0.5V loop
drop at full load as well as meeting ampacity requirements of the protection fuse or circuit breaker.
Battery cables should be sized for a 0.25V drop from battery to the power system at full load including anticipated
growth. The cables should also meet ampacity requirements. Cables terminating directly on battery posts or
connection details should be secured so that there is no stress on the battery posts. Lead plated lugs and lead
plated or stainless steel hardware should be used on all terminations at vented batteries to reduce corrosion.
Prepare, route and connect cables from power system to battery termination details. Terminating points should be
burnished and a corrosion-inhibiting agent, such as NO-OX-ID “A”
™, should be applied to all battery terminal
connections.
NOTE: Final connection to battery live should not be made. Switch battery contactors off or remove the battery fuses (if
used). See system startup procedure before connecting batteries online.
5.6.1 DC Input to Panel
The DCP03 contains bus bar input for hot and return connections. The CXPS 48-1.8-M2 system is configured
with vertical bus bars for rectifier shelf integration.
NOTE: Bus bar inputs are fixed for hot and return placement.