HSF 300W 042315
1
1.
INTRODUCTION
1.1
SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco HSF 300W Series of
Switching Power Supplies. For service information, write directly to: Kepco Inc., 131-38 Sanford
Avenue, Flushing, New York, 11355, U.S.A. Please state Model Designation and Serial Number of
your HSF Power Supply. This information can be found on the nameplate of the unit.
1.2
DESCRIPTION
The Kepco HSF 300 Watt Series are hot swappable, high frequency switching, plug-in power sup-
plies that are completely interchangeable with the metered HSF Series. Six models may be
selected for outputs of 5V, 12V, 15V, 24V, 28V or 48V. They employ forward conversion and power
factor correction and are designed to operate in a fault tolerant power system with a nominal a-c
input of 100V a-c to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency
range 47-440Hz). A built-in current balancing circuit and OR-ing diodes allow configuration for
hot-swap and parallel-redundant N+1 operation.
These power supplies are designed to be used with Kepco's Series RA 19-4C rack adapters. The
RA 19-4C rack adapter accepts up to four 300W modules. All input/output connections are
through a 24-pin connector that plugs in to the rack adapter. All external connections described in
the following paragraphs are made through the rack adapter’s I/O connector (see Figure 1).
FIGURE 1. HSF REAR PANEL CONNECTOR AND RA 19-4C RACK ADAPTER I/O CONNECTOR
TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS
Signal
Name
Pin
Function
1, 2, 4
DC output (+) applied to load.
Output –
3, 5, 6
DC Output (–) applied to load.
SENSE–
7
Sense– connection
IMON+
8
Current (sense resistor).
SENSE+
9
Sense+ connection
NO
10
Normally Open contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2.1).
IMON–
11
Current Monitor– (sense resistor).
–COM
12
–Signal Common provides return for REF, pin 15, and RV, pin 18, signals.
NC
13
Normally Closed contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2.1).
AL COM
14
Common contact of alarm relay (see PAR. 3.7.2.1).
REF
15
Reference voltage. When used with RV, pin 18, allows all output voltages of paralleled slave supplies to be
controlled by one voltage adjustment of a master power supply. When REF is connected to RV via an
external trimmer, the external trimmer determines output voltage (see PAR. 3.4.2). Connections are made
via DIP switches (see PAR. 3.1).
3042951
8
9
7
12 11 10
15
18
16
17
14 13
21 20 19
2
1
3
4
5
6
22
23
24
