KEPCO RA 19-1U Operator Manual - Manual (Page 31)

RA 19-1U 020413
2-15
2.4.3 SERIES OPERATION
HSF -1U and -1UR power supplies may be connected in series to obtain higher output voltages.
The RA 19-1U rack adapter is designed to safely handle a maximum output voltage of 500
Volts; contact Kepco applications engineering for additional information. The power supply with
the lowest rated value of maximum current establishes the maximum load current allowed.
Series configurations can only be accomplished by external wiring of the I/O mating connector.
V+ of one supply must be connected to V– of the next supply at the DC OUTPUT terminal block.
It is recommended that reverse diodes be connected at the output of each power supply con-
nected in series.
The DC OUTPUT + terminal of one supply must be connected to DC OUTPUT – terminal of the
next supply. Each Power Supply in series must be protected by a reverse diode connected in
parallel with the output as shown in Figure 2-11. The diode protects against reverse voltages.
Protection diodes must conform to the following specifications:
• V
REV
> 2 x V
NOM
x N where V
NOM
is the output voltage of the HSF power supply and N
is the number of power supplies connected in series.
• I
FWD
> 1.5 x I
NOM
where I
NOM
is the output current of the HSF power supply.
DIP switches (positions 1 through 4) between series-connected supplies and at both ends of the
series-connected group must be set to OFF (open). Sensing can be either local or remote (PAR.
2.4.1.3). Local sensing requires external wiring (PAR.2.4.1.2). Figure 2-11 illustrates PS1, PS2
PS3 and PS4 connected in series.