©2013, KEPCO, INC
1
Data subject to change without notice
228-1563 REV 10
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
I N S T R U C T I O N M A N U A L
KEPCO
An ISO 9001 Company.
HSF-1UR
50W SERIES
KEPCO SINGLE OUTPUT, 1U, 50 WATT
HOT SWAP PLUG-IN POWER SUPPLIES
I — INTRODUCTION
The Kepco HSF-1UR, 50 Watt Series hot swappable, high
frequency switching, plug-in power supplies with built-in
power factor correction (PFC) employ forward conversion
and are designed to operate in a fault tolerant power sys-
tem with either a-c or d-c input. A thermistor soft-start cir-
cuit limits start-up surge. Built-in OR-ing diodes (all models)
and a forced current share circuit (all models except 3.3V)
allow configuration of all models for hot-swap and parallel-
redundant N+1 operation. Outputs of 3.3, 5, 12, 15, 24, 28
or 48V are available (see Table 1).
These power supplies are designed to be used with
Kepco’s Series RA 19-1U rack adapters. The RA 19-1U
rack adapter accepts up to four 50 Watt, 100 Watt or 150
Watt units (see Figure 2). All input/output connections are
through a 24-pin connector that plugs in to the rack
adapter. All external connections are made through the
rack adapter. I/O signals and implementation of HSF
options are described in detail in the RA 19-1U Rack
Adapter Manual. Surface mount technology permits effi-
cient component layout for minimum mounting space.
EMI filtering is designed to meet FCC Class B rating and
VDE 0871 Class B rating. Table 1 contains specifications
that vary for each model of the HSF-1UR 50 Watt Series.
Common specification are listed on page 5.
OPTIONS.
There are four options available: T, C, X and
Y. Features for all models are the same, except as follows:
The heart of the standard 50W HSF-1UR (no options) mod-
els is a Kepco RKW power supply (28V model not avail-
able).
T option (-1URT) models use a Kepco RTW power supply
instead of the RKW. T option models weigh less, and have
improved efficiency (input current) specifications. All volt-
ages are available.
C option (-1URC) models include a current sensing resis-
tor, allowing external current monitoring within ±10% (con-
tact Kepco if greater accuracy required). In addition, a 28V
model is available with Option C. All voltages are available.
X option (-1URX) remote control models are identical to T
option, but also include the ability to turn the unit on and off
from a remote location. All voltages are available.
Y option models (-1URY) are identical to T option, but also
include both current monitoring and remote on-off capabili-
ties. All voltages are available.
When the input is cut off, the output is maintained for 15
milliseconds minimum (25 for T, C, X and Y models). If the
power supply shuts down due to an output overvoltage
condition, it is then necessary to wait 60 seconds minimum
(30 for T, C, X and Y models) before turning the unit on
again.
II — FEATURES
FRONT PANEL ACCESS.
The front panel provides a
power ON/OFF switch controlling input power and a “VDC
ON” light which indicates when the unit is operating.
NOTE:
The ON/OFF switch must be set to OFF before remov-
ing unit from rack adapter.
The front panel “MASTER
ON” LED lights when 1) the unit operates independently, or
2) the unit is used in parallel redundant configurations while
a) the output is less than 10% of nominal or b) the output is
within 10% to 100% of nominal and the unit is functioning
as a master. In parallel redundant configurations, the mod-
ule with the highest voltage functions as the master. The
other units are slaves, and track the output voltage of the
master. Refer to
Current Share Bus (CSB)
on page 4 for
details. The front panel Vadj trimmer provides adjustment of
the output voltage within the limits specified in Table 1; test
points connected to the +S and –S lines are available at the
front panel for measuring the output.
