KEPCO RA 19-4B - Manual (Page 33)

RA 19-4B 011409
2-23
2.8.4 OUTPUT LOAD CONNECTIONS
Load connections to the rack adapters are achieved via two terminal blocks located on the
backplate assembly. Wires must be sized according to expected current. Wire size range is 20-
10 AWG; torque to 6 lb-in (0.6N•M) maximum. (Sensing connections are made through the I/O
mating connector, PAR. 2.4.1)
NOTE!
REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE
LINES MUST BE PROPERLY CONNECTED FOR OPERATION.
2.8.4.1 PARALLEL/REDUNDANT OPERATION
Removal of an HSF power supply from a “live” system must be done only by
authorized service personnel after HSF power switch is set to OFF. Danger-
ous voltages may be accessible through the open slot after a power supply
is removed.
Identical HSF power supplies can be connected in parallel to provide redundant operation or
increased output current to a common load. Maximum output current for each terminal pair of
the DC OUTPUT terminal blocks is 35 Amperes. Connect (+) to (+) and (–) to (–) at the DC
OUTPUT terminal block (see Figure 2-5).
NOTE: Verify that the sense lines and current share bus are configured per PAR. 2.4.2. An
external bus is required where current exceeds 35 Amperes.
2.8.4.2 SERIES/INDEPENDENT OPERATION
The rack adapter can be used for either independent or series operation of HSF power supplies;
it is factory configured for independent operation using local sensing. To select remote sensing,
refer to PAR. 2.4.1.3.
For series operation, connect (+) and (–) terminals at the DC OUTPUT terminal block of power
supplies to be connected in series (see Figure 2-10). The HSF power supplies are equipped
with blocking diodes which allow series operation without further modification. The RA 19-(X)B
Series rack adapter is designed to safely handle a maximum output voltage of 500 Volts.
2.8.4.3 MIXED OPERATION
The design of the Series RA 19-(X)B rack adapters permits the user to configure HSF power
supplies for almost any combination of independent, series and parallel operation, both within a
single rack adapter and between different RA 19-(X)B rack adapters, within the limits of the HSF
operation envelope and the current and voltage ratings specified in PAR.s 2.8.4.1 and 2.8.4.2.
The user must ensure that the requirements for each configuration stated above are met. If any
questions or problems arise, the user is encouraged to contact the Kepco Applications Engi-
neering group for technical assistance.
WARNING