KEPCO HSF 12-53W User manual

IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num-
bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-
mentation Office in New York, [phone], requesting the correct revision for your
particular model and serial number.
3) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
Data subject to change without notice.
KEPCO®
THE POWER SUPPLIER™
MODEL
OPERATOR’S MANUAL
KEPCO INC.
KEPCO, INC. z131-38 SANFORD AVENUE zFLUSHING, NY. 11355 U.S.A. zTEL [phone] zFAX [phone]
email: [e-mail] zWorld Wide Web: http://www.kepcopower.com
An ISO 9001 Company.
HSF 600 Watts
©2010, KEPCO, INC
P/N 228-1588-M
HSF 600 WATTS
POWER SUPPLY
HSF 600 WATTS
POWER SUPPLY
SINGLE OUTPUT POWER SUPPLIES
SINGLE PHASE, POWER FACTOR CORRECTED
UNIVERSAL AC INPUT
HSF 12-53, HSF 15-43, HSF 24-27,
HSF 28-23, HSF 48-13
HSF 12-53C, HSF 15-43C, HSF 24-27C,
HSF 28-23C, HSF 48-13C
HSF 12-53W, HSF 15-43W, HSF 24-27W,
HSF 28-23W, HSF 48-13W

iHSF 600W 120110
TABLE OF CONTENTS
SECTION PAGE
LIST OF FIGURES
FIGURE TITLE PAGE
LIST OF TABLES
TABLE TITLE PAGE
1 Introduction ........................................................................................................................................................ 1
1.1 Scope of Manual ............................................................................................................................................. 1
1.2 Description ...................................................................................................................................................... 1
1.3 Options............................................................................................................................................................ 1
2 Specifications..................................................................................................................................................... 2
3 Features.......................................................................................................................................................... 6
3.1 DIP Switch Configuration ................................................................................................................................ 6
3.2 Front Panel Access......................................................................................................................................... 7
3.3 Keying ............................................................................................................................................................. 8
3.4 Output Voltage Control ................................................................................................................................... 8
3.4.1 Front Panel Voltage Control......................................................................................................................... 8
3.4.2 Remote Voltage Control............................................................................................................................... 9
3.4.3 W Models ONLY: VDC ON/Alarm Indicator Function ................................................................................ 10
3.5 Remote On-Off.............................................................................................................................................. 10
3.6 Protection Circuits......................................................................................................................................... 11
3.6.1 Overvoltage And Overtemperature Protection ........................................................................................... 11
3.6.2 Overcurrent Setting and Protection............................................................................................................ 11
3.6.3 Fan Failure................................................................................................................................................. 12
3.6.4 Undervoltage.............................................................................................................................................. 12
3.7 Alarm Settings............................................................................................................................................... 12
3.7.1 Visual Alarm. .............................................................................................................................................. 12
3.7.2 Alarm Signals. ............................................................................................................................................ 12
3.7.2.1 Internal Isolated Relay Alarm .................................................................................................................. 12
3.7.2.2 Optically-Coupled Logical Alarm ............................................................................................................. 13
3.8 Local/remote Sensing ................................................................................................................................... 14
3.9 Retaining Latches ......................................................................................................................................... 14
4 Load Connection.............................................................................................................................................. 14
5 Connecting Multiple Power Supplies ............................................................................................................... 15
5.1 Adjusting the Voltage .................................................................................................................................... 15
5.2 Parallel Connections, Standard and C Models ............................................................................................. 15
5.3 Parallel Connections, W Models ................................................................................................................... 15
5.3.1 Minimum Load (W Models) ........................................................................................................................ 16
5.3.2 Voltage Set Restrictions (W Models) ......................................................................................................... 16
1 HSF Rear Panel Connector and RA 19-4C Rack Adapter I/O Connector .................................................. 1
2 Power Rating Vs. Temperature (Input: 95 to 264V a-c).............................................................................. 3
3 Mechanical Outline Drawing Of The HSF 600W Power Supply ................................................................. 6
4 DIP Switch Configuration............................................................................................................................ 7
5 Front Panel Controls, Indicators and Test Points ....................................................................................... 8
6 DIP Switch Settings for Control of Output Voltage ..................................................................................... 9
7 Connections For Remote Voltage Control ................................................................................................ 10
8 DIP switch settings for VDC ON/ALARM Power Options ......................................................................... 10
9 DIP Switch Settings for Using RESET button or Remote ON-OFF .......................................................... 11
10 DIP switch settings for Optically Coupled Logical Alarm .......................................................................... 13
11 Output Alarm Circuit Optically Isolated..................................................................................................... 13
12 ±PF Power Failure Optocoupler Timing Diagram..................................................................................... 14
1 HSF Rear Connector Pin Assignments ......................................................................................................2
2 Output Ratings and Specifications ..............................................................................................................3
3 Power Supply Ratings and Specifications ..................................................................................................4
4 Minimum Conditions for Relay and LED Operation ....................................................................................9
5 W Models: Conditions for VDC ON/ALARM LED Operation Powered by Output .....................................10

HSF 600W 120110 1
1 INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco HSF 600W Series of
Switching Power Supplies. This manual covers only standard (no suffix), Option C and Option W
models. 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 600 Watt Series are hot swappable, high frequency switching, plug-in power sup-
plies. Five models may be selected for outputs of 12V, 15V, 24V, 28V or 48V. They employ for-
ward 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 264 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 600W 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).
1.3 OPTIONS
Option W models are similar to the standard models except that the relay functions at a lower out-
put voltage, and the DC ON indicator functions down to 0V output voltage. W models also do not
require a minimum load for parallel load sharing.
Option C models allow independent monitoring of output current of non-metered models by pro-
viding an integral sense resistor (Rs). Current monitoring is via ±IMON assigned to pins 9 (–) and
1 (+) of the RA 19-4C I/O connector: Monitored Output Current (Amps) = Voltage drop across Rs
(Volts) / Rs (Ohms) (see Table 2), where voltage drop across Rs is measured across ± IMON pins
(requires millivoltmeter, range 0 to 200mV). Accuracy is ±10%; contact Kepco if greater accuracy
is required. There is no isolation between ±IMON, alarm circuit and d-c output. Refer to the RA
19-4C Manual for details.
RoHS-compliant models are indicated by HSF* (e.g., HSF*28-23).
FIGURE 1. HSF REAR PANEL CONNECTOR AND RA 19-4C RACK ADAPTER I/O CONNECTOR
3042951
897
12 11 10
15
18 1617
14 13
21 20 19
21
34
56
22
23
24
1 OUTPUT+OUTPUT+ 2
3 OUTPUT-
5 OUTPUT-
7 S-
8 IMON+
10 NO
OUTPUT+ 4
OUTPUT- 6
S+ 9
IMON - 11
REF 15
CSB 17
+RC 20
13 NC
14 AL COM
16 +PF
19 -PF
AC IN (GND) 22
AC IN (L) 24
23 AC IN (N)
-COM 12
RV 18
-RC 21

2HSF 600W 120110
2 SPECIFICATIONS
Table 2 contains specifications and operating limits of individual HSF 600W Series models. Table
3 contains specifications and operating limits common to all HSF 600W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS
Signal
Name Pin Function
Output + 1, 2, 4 DC output (+) applied to load.
Output – 3, 5, 6 DC Output (–) applied to load.
SENSE– 7 Sense– connection.
IMON+ 8 Current Monitor+ (not used).
SENSE+ 9 Sense+ connection.
NO 10 Normally Open contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2).
IMON– 11 Current Monitor– (not used).
–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).
AL COM 14 Common contact of alarm relay (see PAR. 3.7.2).
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).
+PF 16 +Power Fail of open-collector alarm circuit. Used with –PF, pin 19 (see PAR. 3.7.2).
CSB 17 Current Share Bus - Used whenever several power supplies are connected in parallel (see PAR. 5).
RV 18 Remote Voltage - Used with REF, pin 15, for remotely controlling the output voltage (see PAR. 3.4.2).
–PF 19 –Power Fail of open-collector alarm circuit. Used with +PF, pin 16 (see PAR. 3.7.2).
+RC 20 +Remote On-off used with –RC, pin 21, to allow remote turn-on turn-off of the unit (see PAR. 3.4.3).
–RC 21 –Remote On-off used with +RC, pin 20, to allow remote turn-on turn-off of the unit (see PAR. 3.4.3).
GND 22 AC input ground.
N 23 AC Input neutral.
L 24 AC input line.

HSF 600W 120110 3
FIGURE 2. POWER RATING VS. TEMPERATURE (INPUT: 95 TO 264V A-C)
TABLE 2. OUTPUT RATINGS AND SPECIFICATIONS
MODEL HSF 12-53 HSF 15-43 HSF 24-27 HSF 28-23 HSF 48-13
Output Volts d-c (nominal) 12 15 24 28 48
Output
Adjustment
Range(1)
Using front panel trim pot or
external 5K ohm Trimpot
(Volts d-c)(2) 0 - 13.8 0 - 17.4 0 - 28.2 0 - 33 0 - 52.2
Using Voltage source
(Volts d-c) 0 - 13.8 0 - 17.4 0 - 28.2 0 - 33 0 - 52.2
Output Current (nominal) (Amps d-c) 53 43 27 23 13
Maximum Output Ratings (3) (Watts) 636 645 648 644 624
Overcurrent Setting (Amps d-c)(4) 55.6-68.9 45.1-55.9 28.3-35.1 24.1-29.8 13.7-16.9
Short Circuit Current (Amps d-c) 65 55 35 29 19
Overvoltage Protection (OVP) (Volts d-c)(5) 14.3 - 16.8 18.0 - 21.0 29.3 - 33.6 34.2 - 39.2 54.5 - 59.8
Efficiency
% typical
AC Input 100V 80 81 82 82 84
AC Input 200V 84 85 86 86 87
Power Factor
(typ.)
AC Input 100V 0.99 0.99 0.99 0.99 0.99
AC Input 200V 0.95 0.95 0.95 0.95 0.95
Ripple &
Noise(6)
(mV, p-p)
ripple 180 180 220 220 220
ripple noise 220 220 320 320 320
Sense Resistor (IMON) values (Ohms)(7) 0.002 0.005 0.01 0.01 0.02
(1) Refer to Table 4 for minimum conditions required to maintain proper operation of alarm relay and visual LED indicator.
(2) Output voltage may not adjust to 0V due to residual trimmer resistance.
(3) See Figure 2 for power derating.
(4) Square type. Output voltage returns automatically only if cause is removed within 30 seconds (see PAR. 3.6.2).
(5) When overvoltage is detected, output is shut OFF. Recovery is by removing, and after approximately 40 seconds, reapplying
AC input power or by reset (open and close) at ±RC terminals (no delay).
(6) Ripple and noise levels above are satisfied when conditions are 0 to 100% load, 0 to 40°C (load is derated from 40 to 55°C,
see Figure 2), and bandwidth </= 100MHz.
(7) Option C only.
NOTE:
Safety agency approvals
apply only to operation
between -10°C and 40°C.

4HSF 600W 120110
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS
CHARACTERISTIC SPECIFICATION CONDITION/NOTES
Input Voltage Nominal: 100-120V a-c, 200-240V a-c
Range: 85-264V a-c (1), 110-370V d-c (0 to 100% load, -10 to 40°C)
Input Source Frequency Nominal: 50-60 Hz
Range: 47-440 Hz
(0 to 100% load, -10 to 40°C)
At 440 Hz leakage current exceeds
UL/VDE safety spec. limit.
Input Current: (Maximum Load At
25°C with Nominal Output Voltage)
8.4A rms max. 100 - 120V a-c
4.2A rms max. 200 - 240V a-c
Switching Frequency 140KHz typ. Forward Converter
Input Protection A limiting resistor in series with a resistor fuse (and thyristor circuit) reduces start-up surge.
The internal power supply is protected against shorts by an input fuse. Fuse value 15.0A at
250 Volts
Input Surge cold start, interval > 30
sec ( First surge only, not including
current flow into EMI filter )
15A typ., 30A max. first surge 100 - 120V ac
30A typ., 60 max. first surge 200- 240 V ac
Leakage Current: 0.45mA typ., 0.75mA max. 120V a-c, 60Hz per IEC 950 and UL1950
0.60mA typ., 0.75mA max. 240V a-c, 60Hz per IEC 950 and UL1950
Power Factor 0.99 typical 100V a-c, max load, nominal output,
per EN 61000-3-2
0.95 typical 200V a-c, max load, nominal output
per EN 61000-3-2
Transient Recovery excursion
characteristic
±4% maximum 50% to 100% load,
transient time >50µsec
recovery time 1 ms maximum
Stabilization
Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum 85 to 132V a-c, 170 to 264V a-c
Load Effect ±0.3% Typical, ±0.6% Maximum 0%-100% load change
Temperature Effect ±0.5% Typical, ±1.0% Maximum –10° to 40°C
Combined Effect ±0.9% Typical, ±1.8% Maximum Source, Load and Temperature
Time Effect 0.2% Typical, 0.5% Maximum 1/2 to 8 hours at 25°C
Start-up Time 280 msec Typical, 350 msec Maximum 100V a-c
100 msec Typical, 150 msec Maximum 240V a-c
Output Hold-up Time 30 msec Typical, 20 msec Minimum. 100V a-c
40 msec Typical, 20 msec Minimum. 240V a-c
Overvoltage Protection When the Power Supply goes into an overvoltage condition, the output is cut OFF. See PAR.
3.6.1.
Remote Control ON/OFF: ±RC pins control on/off as follows:
“High”, 2.4V to 24V (or open), unit OFF- Fan Off;
“Low”, 0.0V to 0.4V (or closed), unit ON.
Source current: 1.6mA maximum at low level
Sink current: 1.0 mA maximum at high level.
Must be enabled by DIP switch positions 3
and 4 (see PAR. 3.4.3).
Operating Temperature: -10 to 40°C (1) (see Figure 2.)
Startup Temperature -10 to -20°C (see Figure 2.)
Storage Temperature: -30°C to +75°C
(1) For input voltage between 85 to 95V a-c maximum operating temperature is 35°C.

HSF 600W 120110 5
Withstanding voltage : (at 15-35°C
ambient, 10-85% relative humidity)
2000Va-c for 1 minute. Cutout current is 20mA Between input and ground
500Va-c for 1 minute. Cutout current is 100mA Between output and ground
3000Va-c for 1 minute. Cutout current is 20mA Between input and output terminal
Insulation Resistance: (at 25°C,
65% relative humidity)
100 Megohms minimum (500Vdc) Between output and ground, input and
ground, and input and output,
Humidity: 10% to 95% relative humidity, noncondensing,
Wet Bulb temperature <35°C operating and non-operating
Vibration: 5-10 Hz., 10mm amplitude, 10-55 Hz., accelera-
tion 64.3ft./s2(19.6M/s2) (2g) non-operating 1 hr. on each of 3 axes,
sweep time 10 minutes
Shock: Acceleration: 643.5ft./s2 (196.1M/s2) (20g),
Pulse Duration: 11ms ± 5 msec
(non-operating, 1/2 sine pulse, three
shocks on each axis, Power Supply is
fixed on its bottom side)
Safety: UL 60950-1, 1st Edition, 2007-10-31; CSA C22.2 No. 60950-1-03, 1st Edition, 2006-07;
EN 60950
EMC Emission - Conducted: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EMC Emission - Radiated: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EMC Emission - Input harmonics
current:
Designed to meet EN61000-3-2
EMC Immunity Designed to meet EN61000-6-2
EMC Radiated susceptibility: EN61000-4-3 level 3 normal operation
EMC Conducted susceptibility: EN61000-4-6 level 3 normal operation
ESD: EN61000-4-2, level 4 normal operation
Electrical fast transient burst: EN61000-4-4 level 3 normal operation
Surge withstand: EN61000-4-5, level 4 No damage
Power Frequency Magnetic Field: EN61000-4-8, level 4 normal operation
Voltage dips interruptions and
variations
EN61000-4-11 normal operation
Dimensions: 5.22 in. (132.5 mm) x 4.288 in. (108.9 mm) x 16.86 in. (428.2 mm) (See Figure 3)
Mounting: Plug-in
Cooling: Forced air flow - fan
Frame Material/Cover Material: Steel
Weight 9 lbs, 4.1Kgs. maximum
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
CHARACTERISTIC SPECIFICATION CONDITION/NOTES

6HSF 600W 120110
FIGURE 3. MECHANICAL OUTLINE DRAWING OF THE HSF 600W POWER SUPPLY
3FEATURES
3.1 DIP SWITCH CONFIGURATION
The HSF 600W Series incorporates two DIP switches, SW1 and SW2 (see Figure 4), which must
be configured before the unit is installed in the rack adapter. The DIP switches control the follow-
ing parameters:
• Positions 1 and 2 allow the output to be controlled either by the front panel Vadj control
(see PAR. 3.4.1) or by remote control using either an external trimpot or voltage source
(see PAR. 3.4.2). These positions can also be configured to allow a master/slave combi-
nation to be controlled either by the front panel Vadj control or by remote control using
either an external trimpot or voltage source (see PAR 3.4).
• Positions 3 and 4 either allow the front panel reset button to be used to reset the unit
after a fault or allow Remote on-off via mechanical switch or logic level (see PAR. 3.4.3).
4.288 [108.9]
5.218[132.5]
1.500
[38.1]
0.093 [2.4]
14.667 [372.5]
5.040[128.0]
0.188 [4.8]
0.093 [2.4]
0.093
[2.4]
0.127
[3.2]
0.430 [10.9]
2.065
[52.5]
3.353
[85.2]
0.337 [8.5]
0.085 [2.2]
0.204 [5.2]
0.090 [2.3]
0.943 [23.9]
2.408 [61.2]
0.438 [11.1]
0.394
[10.0]
3.216 [81.7]
0.606 [15.4]
0.690 [17.5]
FRONT VIEW
REAR VIEW
SEE
REAR
VIEW
SEE
FRONT
VIEW
NOTES:
1. MATERIAL:
A) BACKPLATE 0.064" THK. ALUM. 5052-H32
B) PCB 0.063" THK FR-4
C) FRONT PANEL 0.090 THK. ALUM. 6061-T6
2. FINISH:
FRONT PANEL -KEPCO DUAL TONE GRAY
3. MODULE IS KEYED AS SHOWN IN DETAIL
4. DIMENSIONS ARE IN INCHES, [DIMENSIONS IN BRACKETS
ARE IN MILLIMETERS].
3042952
15V12V
= PIN PRESENT
= PIN MISSING
KEYING
DETAIL "A"
SEE DETAIL "A"
24V 28V 48V
AIRFLOW

HSF 600W 120110 7
• Positions 5 and 6 allows alarm signals to be produced from either internal relay, Form C
contacts (one NO, one NC) or open-collector logical alarm signals (see PAR. 3.7.2).
• For standard or C models position 8 of SW1 either disables (default) or enables the
visual alarm indication (see PAR. 3.7.1). For W models positions 7 and 8 determine
whether the DC ON indicator is powered internally or from the HSF output voltage (see
PAR. 3.4.3).
FIGURE 4. DIP SWITCH CONFIGURATION
3.2 FRONT PANEL ACCESS.
The front panel provides a power ON/OFF switch controlling input power and a "VDC ON" indica-
tor which lights green when the unit is operating. If the unit is connected in a parallel configuration,
the indicator lights red if the unit shuts off automatically, or the POWER switch is set to OFF.
CAUTION: DO NOT repeatedly toggle the power ON/OFF switch as this may cause unit to
fault.
NOTE: The ON/OFF switch must be set to OFF before removing unit from rack adapter.
If remote on-off is not enabled (see PAR. 3.4.3), the OUTPUT RESET button restores output
power in the event that overcurrent or overvoltage protection has tripped, or thermal overload or
fan malfunction has occurred.
If remote voltage control (see PAR. 3.4.2) is not enabled, the front panel Vadj trimmer (see PAR.
3.4.1) provides adjustment of the output voltage within the limits specified in Table 2; test points
are available at the front panel for monitoring the DC output.
Figure 5 shows the location of all operating controls, indicators and test points followed by an
explanation of each.
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
- DC ON PWR BY REF V ENABLED
3043031
SEE DETAIL VIEW
DC ON PWR BY REF
ALARM LED DISABLE
44-RC
SW2
DC ON PWR BY OUTP V 8
-COM 7
-PF
+PF 5
6
88
8
SW1
6
77
55
66-PF
7
5+PF
-RC
+RC
4
3
RV
REF
2
1
OFF
3
4
3
1
22
1
2
3+RC
1
RV
REF
OFF
ON ON
SEE APPLICABLE
DESCRIPTION
FOR STANDARD
C OR W MODELS.
NOTE: NOT ALL COMPONENTS SHOWN.
DETAIL VIEW
SW2 SW1
REF11
1
REF 1
-NOT USED
ALARM LED DISABLE
SW1
SW2
W Models
+PF 5
-COM 7
N/A 8
-PF 6
+RC 3
-RC 4
RV 2
+PF
5
5
5
7
7
88
66
7
8
-PF
6
3
3
44
22
3+RC
-RC
4
RV
2
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
Standard and C Models
ON
OFF OFF ON

8HSF 600W 120110
3.3 KEYING
Keying of the HSF 600W is established at the factory. The output voltage determines which key
pins are installed (see Figure 3, Detail A). When the proper holes in the rack adapter are blocked
by keying screws installed by the user, only a power supply of the correct voltage can be inserted
in the rack adapter slot. Refer to the RA 19-4C Manual for rack adapter keying instructions.
1. VDC ON/ALARM indicator. Lights green when unit is operating. Can be configured by DIP
switch to light red to indicate loss of output voltage in parallel configurations. W models allow
selection of whether indicator is powered by output or will function down to 0V. (see PAR.
3.7.1).
2. V.ADJ Output voltage adjustment trimmer: Adjusts output voltage within limits specified in
Table 2 (see PAR. 3.4.1). Not functional if remote voltage control is enabled (see PAR.
3.4.2).
3. DC output test points (+, –): Connect to voltmeter to monitor output voltage.
4. OUTPUT RESET switch. Used to recycle power in the event of an alarm condition (see PAR.
3.6). Not functional when remote on/off control is enabled (see PAR. 3.4.3).
5. POWER ON/OFF switch. Applies power to the unit. CAUTION: Power must be OFF before
unit is removed from the rack adapter.
6. Retaining Latches (2). Prevents inadvertent removal of unit from rack adapter (see PAR.
3.9)
FIGURE 5. FRONT PANEL CONTROLS, INDICATORS AND TEST POINTS
3.4 OUTPUT VOLTAGE CONTROL
Output Voltage can be controlled from either the front panel (PAR. 3.4.1) or externally using a
trimpot or voltage source (PAR. 3.4.2).
3.4.1 FRONT PANEL VOLTAGE CONTROL
Output voltage can be manually adjusted with the voltage adjustment control, Vadj (see Figure 5
for location) when DIP switches SW1 and SW2 (see Figure 4 for location) are configured as
shown in Figure 6A (factory default) To adjust voltage, first place the unit under an operating load.
3042857
1
2
3
4
3
5
6

HSF 600W 120110 9
Then monitor the (+) and (–) test points on the front panel with a precision voltmeter and turn the
voltage control to the desired operating value. Refer to Table 2 for the recommended Adjustment
Range of all the HSF 600W Models.
3.4.2 REMOTE VOLTAGE CONTROL
For remote voltage control, set positions 1, 2 and 7 as shown in Figure 6B. This removes control
from the front panel Vadj control and allows the output voltage to be adjusted by either an external
trimmer pot (resistance) or by an external variable voltage source connected across the rack
adapter I/O connector pin 12 (RV, Remote Voltage) and pin 10 (–COM, Common) as shown in
Figure 7. At the rack adapter I/O connector use a shielded wire 6.6 feet (2M) maximum in length,
for connection of REF (pin 2), RV (pin 12), and –COM (pin 10) to the trimmer control or external
voltage source.
NOTE: If remote voltage control is not implemented, the factory default for positions 1, 2 and 7 of
DIP switches SW1 and SW2 must be restored (Figure 6A).
FIGURE 6. DIP SWITCH SETTINGS FOR CONTROL OF OUTPUT VOLTAGE
It is possible that overvoltage protection may be triggered if the output voltage is decreased to a low
level very quickly when the power supply is at a low load condition.
RESISTANCE: Connect the external trimmer as shown in Figure 7A. Suggested value for the trim-
mer control is 5K ohms. Referring to Figure 7 (A), Resistor R is used to obtain minimum output
voltage required to ensure proper operation of the alarm relay and LED indicator; see Table 4 for
values. NOTE: Output voltage may not adjust to 0V due to residual trimmer resistance.
VOLTAGE. By adjusting an external 0 to 6V voltage source (0 to 5.5V for the 48V model), the HSF
power supply output voltage can be adjusted as specified in Table 2. To ensure proper operation of
the alarm relay and LED indicator do not adjust external voltage below minimum listed in Table 4.
Connect the voltage source across the RV and –COM pins as shown in Figure 7B.
TABLE 4. MINIMUM CONDITIONS FOR RELAY AND LED OPERATION
MODEL HSF 12-53 HSF 15-43 HSF 24-27 HSF 28-23 HSF 48-13
Minimum HSF output voltage required for relay and
LED functioning (Volts d-c)19.0 11.5 17 21.5 35
Minimum resistance of Limit resistor R (Figure 7A) in
series with 5K ohm Trimpot to ensure proper operation
of LED and relay (Ohms)19.1K 9.1K 7.5K 9.1K 10K
Minimum external voltage (Figure 7B) to ensure proper
operation of LED and relay. (Volts d-c)13.8 3.8 3.6 3.9 3.4
1- If operating below minimums listed, see PAR. 3.7.2.2 to implement ±PF alarm signals to monitor power supply status.
OFF
SW1
3043032
COM 7
REF 1
RV 2
77
SW2
7 COM
1
ON
2
1
2
OFF
1 REF
2 RV
ON
SW1SW2
77
1
2
OFF ON
1
2
OFF ON
USING Vadj CONTROL
FRONT PANEL VOLTAGE CONTROL
AB
(FACTORY DEFAULT)
REMOTE VOLTAGE CONTROL
OR VOLTAGE SOURCE
USING EXTERNAL TRIMPOT
COM 7
REF 1
RV 2 2 RV
1 REF
7 COM

10 HSF 600W 120110
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
3.4.3 W MODELS ONLY: VDC ON/ALARM INDICATOR FUNCTION
To use the internal power supply reference voltage to power the VDC ON/ALARM indicator, set
Position 7 of SW1 to ON and Position 8 of SW2 to OFF (default) (see Figure 8A). Load effect is
±1% maximum. To use the HSF output voltage to power the VDC ON/ALARM indicator, set Posi-
tion 7 of SW1 to OFF and Position 8 of SW2 to ON (see Figure 8B). Load effect is ±0.6% maxi-
mum, however the minimums specified in Table 5 must be observed for the indicator to function.
Table 5 lists the minimum HSF output voltage required to maintain VDC ON indicator function for
this case. Maximum output voltage of unit might cause overvoltage trip if SW2, position 8 is
enabled. If this occurs, turn Vadj trim pot counterclockwise to reduce output voltage, then reset the
unit.
FIGURE 8. DIP SWITCH SETTINGS FOR VDC ON/ALARM POWER OPTIONS
3.5 REMOTE ON-OFF
When power is ON at the source, the output may be turned ON or OFF using the ±RC signals if
the remote ON-OFF feature is enabled. Note that when remote ON-OFF is enabled, the RESET
OUTPUT switch does not function. Remote ON-OFF is enabled by setting DIP switch positions 3
and 4 as shown in Figure 9B. The +RC and –RC signals (at the rack adapter I/O connector, pins
15 and 8, respectively) then turn the unit on or off. These pins accept a logic level (2.4V to 24V
TABLE 5. W MODELS: CONDITIONS FOR VDC ON/ALARM
LED OPERATION POWERED BY OUTPUT
MODEL HSF 12-53M HSF 15-43M HSF 24-27M HSF 28-23M HSF 48-13M
Minimum HSF output voltage required for VDC ON
LED to function when SW 2 position 8 is ON and SW 1
position 7 is OFF (Volts d-c)
3.3 3.5 4.5 5 8
3043492
7
7 DC ON PWR BY REF 7
SW1
8
SW2
8
OFF ON OFF ON
USE AUXILIARY SUPPLY
(FACTORY DEFAULT)
TO POWER "DC ON"
A
TO POWER "DC ON"
USE HSF OUTPUT VOLTAGE
B
(REQUIRES MINIMUM OUTPUT VOLTAGE)
7
8
8
SW1
7
SW2
OFF ON ON
OFF
DC ON PWR BY OUTPUT V 8
8
7
7
88
7

HSF 600W 120110 11
“high” and 0.0 to 0.4V “low”), or a contact closure. When the ±RC pins are open, using either a
mechanical switch or a high level logic signal, the HSF 600W output is cut OFF. When the ±RC
pins are shorted, the output returns to within specifications. At low level logic, the maximum
source current is 1.6mA and at high level the sink current is 1.0mA. Positions 3 and 4 of both DIP
switches must be restored to the factory default setting (Figure 9A) if remote ON-OFF is not used.
The ±RC pins are isolated from DC output pins and a-c input terminals.
FIGURE 9. DIP SWITCH SETTINGS FOR USING RESET BUTTON OR REMOTE ON-OFF
3.6 PROTECTION CIRCUITS
The following protection features are implemented in the HSF 600W Series: overvoltage and
overtemperature (PAR. 3.6.1), overcurrent (PAR. 3.6.2), fan failure (PAR. 3.6.3), and undervolt-
age (PAR. 3.6.4). The HSF 600W Series provides a configurable visual alarm (see PAR. 3.7.1) as
well as an option to use either relay contacts or logic levels for alarm signals (see PAR. 3.7.2)
3.6.1 OVERVOLTAGE AND OVERTEMPERATURE PROTECTION
When the output voltage of the HSF 600W Power Supply increases beyond the specified values
(see Table 2), the output is cut OFF and the fan turns OFF. To restart (reset) the unit, press and
release the OUTPUT RESET switch on the front panel or, if the remote on/off feature is in use
(see PAR. 3.4.3), open connection between the RC pins and then reconnect the pins. The unit
may also be restarted by turning the POWER ON/OFF switch to OFF, waiting 40 seconds, then
setting the POWER switch to ON.
When the internal temperature of the HSF (M) 600W Power Supply increases beyond allowable
limit, the output is cut OFF and the fans turn OFF. The restart cycle (Power ON) should not begin
until the temperature returns to within specifications. To restart (reset) the unit, set the POWER
ON/OFF switch to OFF, wait until unit cools, then set the POWER switch to ON. The power supply
cannot be reset using the remote ON-OFF feature unless the power supply remains shut down for
at least 40 seconds.
3.6.2 OVERCURRENT SETTING AND PROTECTION
The output characteristic of the power supply is a square type, and the unit is set to produce an
alarm (see PAR. 3.7.2) and shut down if output current exceeds specifications (see Table 2) for
more than 30 seconds. After the cause of overcurrent is removed, the power supply output is auto-
matically restored.and shut down if output current exceeds specifications (see Table 2) for more
than 30 seconds. Once unit shuts down, to recover either: a) press and release the front panel
OUTPUT RESET switch, or b) open and close connection across ±RC terminals, or c) remove a-c
input power (set POWER switch to OFF), wait 40 seconds, then restore a-c input power.
3042877
33 +RC
+RC 3 3
SW1
-RC 4 4
SW2
44 -RC
OFF ON OFF ON
(FACTORY DEFAULT)
USE FRONT PANEL
RESET BUTTON
AB
(LOGICAL LEVEL OR
MECHANICAL SWITCH)
USE REMOTE ON-OFF
33
SW2 SW1
44
ON
OFF OFF ON
3 +RC
4 -RC
+RC 3
-RC 4

12 HSF 600W 120110
3.6.3 FAN FAILURE
A cutoff of the fan supply voltage or a decrease in fan speed causes the output to shut down and the
fans to turn OFF. Fan failure and all the other protection circuit operations produce an alarm (see
PAR. 3.7.2). To restart (reset) the unit, press and release the OUTPUT RESET switch on the front
panel or, if the remote on/off feature is in use (see PAR. 3.4.3), open the connection between the
±RC pins and then reconnect the pins. The unit may also be restarted by turning the POWER ON/
OFF switch to OFF, waiting 40 seconds, then setting the POWER switch to ON. If fan rotation is
out of specification the power supply will not recover.
3.6.4 UNDERVOLTAGE
If power supply output voltage either falls below 80% of the programmed (set) value, or if output
voltage is programmed below the minimum values listed in Table 4, an alarm occurs if the internal
relay alarm (factory default, see PAR. 3.7.2.1) is enabled. To restart (reset) the unit, press and
release the OUTPUT RESET switch on the front panel or, if the remote on/off feature is in use
(see PAR. 3.4.3), open the connection between the RC pins and then reconnect the pins. The unit
may also be restarted by turning the POWER ON/OFF switch to OFF, waiting 40 seconds, then
setting the POWER switch to ON. To enable the alarm function when operating below the mini-
mum values listed in Table 4, refer to PAR. 3.7.2.2 to configure the optically-coupled alarm.
3.7 ALARM SETTINGS
3.7.1 VISUAL ALARM.
When the unit is connected in a parallel configuration, the front panel VDC ON/ALARM indicator
can be configured to light red if the respective power supply output voltage is lost or if the POWER
switch is set to OFF. This is enabled when DIP switch 1, position 8 set to ON. This can be useful
to indicate the loss of output voltage from one parallel-connected power supply that may not be
readily apparent. The visual alarm is normally disabled: DIP switch SW1, position 8 set to OFF
(factory default).
NOTE: On W models, the meter is powered by an independent internal power supply and will
most likely remain lit after output voltage drops below the minimum voltage required for
relay operation as listed in Table 4. Visual inspection of the front panel VDC ON/
ALARM indicator and/or monitoring of the alarm signals is required to detect a failure.
If the ALARM indicator is enabled to light red, the VDC ON/ALARM indicator must be
powered from the HSF output (see PAR. 3.4.3).
3.7.2 ALARM SIGNALS.
Either of two options are available for signalling alarms: isolated relay contacts (factory default,
PAR. 3.7.2.1) or logic level alarm signals ±PF (PAR. 3.7.2.2). The ±PF logic level alarm option
must be used if the power supply is intended to operate below the minimum voltages listed in
Table 4.
3.7.2.1 INTERNAL ISOLATED RELAY ALARM
The first option, the factory default setting, uses an isolated internal relay offering normally closed
(NC) and normally open (NO) contacts referenced to an isolated common (AL COM). These con-
tacts may be used to configure “close on failure” or “open on failure” alarm circuits. (Refer to the
Series RA 19-4C Manual for alarm configurations for multiple HSF power supplies.) Setting posi-
tions 5 and 6 of the DIP switches as shown in Figure 10A selects this option. The NC (pin 6 of the
rack adapter I/O connector) and NO (pin 7) signals are referenced to Alarm common (pin 14).

HSF 600W 120110 13
3.7.2.2 OPTICALLY-COUPLED LOGICAL ALARM
The second option uses optically-coupled logic level alarm signals, +PF (pin 5 of the rack adapter
I/O connector) and -PF (pin 13), provided directly from the Kepco RKW power supply that is the
heart of the HSF. This option is selected by setting positions 5 and 6 of the DIP switches as shown
in Figure 10B. Use this option if the power supply will operate below the minimum voltages speci-
fied in Table 4.
FIGURE 10. DIP SWITCH SETTINGS FOR OPTICALLY COUPLED LOGICAL ALARM
The logic alarm circuit is a diode transistor optical coupler (see Figure 11). The transistor is nor-
mally conducting. When the alarm is activated upon detection of power loss, overvoltage, fan
fault, overtemperature or overcurrent condition, the transistor cuts off and the collector emitter cir-
cuit is open. Figure 12 is a timing diagram of the power fail signal.
The default state of the alarm is logic low. The sink current for the optocoupler is 50mA maximum,
the maximum collector to emitter saturation voltage is 0.40 Volts, and the collector to emitter volt-
age is 40 volts maximum. The PF signals are isolated from the AC input and DC output.
FIGURE 11. OUTPUT ALARM CIRCUIT OPTICALLY ISOLATED
3042878
55 +PF
+PF 5 5
SW1
-PF 6 6
SW2
66 -PF
OFF ON OFF ON
USE N.O. AND N.C CONTACTS
(FACTORY DEFAULT)
OF INTERNAL RELAY
A
LOGICAL ALARM
USE OPTICALLY-COUPLED
B
(+PF AND -PF)
5
6
6
SW1
5
SW2
OFF ON ON
OFF
+PF 5
-PF 6 6 -PF
5 +PF

14 HSF 600W 120110
FIGURE 12. ±PF POWER FAILURE OPTOCOUPLER TIMING DIAGRAM
3.8 LOCAL/REMOTE SENSING
HSF 600W Power Supplies allow remote error sensing which can compensate up to 0.4 Volts per
load wire. Local/Remote error sensing is configured by means of separate DIP switches mounted
on the RA 19-4C Rack Adapter (see RA 19-4C Rack Adapter Operator Manual). Either local or
remote sensing MUST be used, otherwise the units will not operate.
3.9 RETAINING LATCHES
HSF 600W series power supplies are provided with (2) retention latches located at each side of
the bottom edge of the front panel (see Figure 5). These latches work in conjunction with the RA
19-4C rack adapters to prevent unauthorized or inadvertent module extraction from an operating
power system. The latch is engaged by loosening the cap-head screw approximately 1/2 turn
CCW (use 5/32" hex key) and sliding the latch down to the bottom of the slot, then retightening the
cap-head screw CW until snug. DO NOT OVERTIGHTEN! To release, follow the same procedure,
except lift the latch to the top of the slot. Be sure to move the latch completely up or down to
ensure full engagement and disengagement of the latching mechanism. When the HSF power
supply is not installed in its plug-in rack adapter, it is recommended that the latch be secured in
the open (up) position to prevent damage.
NOTE: Retaining latches must not be used to secure the HSF power supply in the rack
adapter for shipping purposes.
4 LOAD CONNECTION
Connect the load to (+) and (–) terminals at the rear panel of the Rack Adapter (see RA 19-4C
Instruction Manual for details).

HSF 600W 120110 15
5 CONNECTING MULTIPLE POWER SUPPLIES
All connections to multiple HSF power supplies must be made via the I/O mating connectors at
rear of the Rack Adapter or by the Rack Adapter DIP switches. These connections, including the
configuration of the two internal HSF DIP switches, are described in the Rack Adapter Instruction
manual, and include:
• Using one power supply to control the output of multiple supplies.
• Using parallel master/slave configurations (for increased current or redundancy) where
the user either predetermines the master or allows the load to determine which is the
master. These configurations also cover the use of the Current Balancing feature of the
HSF power supply.
• Using series configurations (for increased voltage).
• Using open-on-fail or close-on-fail alarm schemes with multiple power supplies.
5.1 ADJUSTING THE VOLTAGE
NOTE: Refer to the RA 19-4C Rack Adapter manual for alternatives to the standard master/
slave parallel configuration described below.
To adjust the paralleled units, turn off all the units except one (designated as the master) and
adjust to desired voltage using the front page trimmer and monitoring the front panel voltmeter.
• Each slave must be adjusted to a slightly lower voltage than the previous unit. The differ-
ence between the master and the lowest voltage slave must not exceed 2% of ENOM.
• The voltage separation between master and subsequent slave(s) (VSEP) = 2% ENOM / N
where N = number of units in parallel.
Adjust the first slave VSLAVE1 to ENOM - VSEP
. Adjust the second slave VSLAVE2 to VSLAVE1 - VSEP .
Adjust the third slave VSLAVE3 to VSLAVE2 - VSEP and so on.
As an example, for three HSF 24-27 units in parallel, 2% of ENOM is 0.48V and VSEP is 0.48/3 =
0.16V. Turn off the master, then turn on another unit (slave 1) and adjust for 160mV less than the
master. Turn off slave 1 and turn on slave 2 and adjust for 160mV less than slave 1.
When all units are turned on, the unit adjusted to the highest voltage will be the master. If a unit
fails, the VDC ON indicator of that unit is either off or red.
5.2 PARALLEL CONNECTIONS, STANDARD AND C MODELS
When using parallel-connected standard (no suffix) and C Models, a minimum load is required to
avoid the slave becoming “idle.” When the slave is idle, the output is off, no lights are lit, and the
alarm is set.
The minimum load (Amperes) = N x (I/10)
where N = the number of units in parallel,
I = Nominal current rating of individual power supply (Amperes).
For applications requiring either no load or lower than minimum load conditions, the W Models are
recommended (MZ models for the HSF metered series).
5.3 PARALLEL CONNECTIONS, W MODELS
If parallel-connected W models are controlled individually, either a minimum load (PAR 5.3.1) or
voltage set restrictions (PAR. 5.3.2) are required to avoid slave “idle” or slave “oscillating output”
conditions; the idle and oscillating output conditions show slightly different indications depending

16 HSF 600W 120110
on the position of SW1 position 7 as defined below. NOTE: If the minimum load is maintained,
voltage set restrictions are not required.
If position 7 of SW1 is set to off (default, see PAR. 3.1), the VDC ON indicator is powered from the
output; therefore when a slave is idle, the output is off, VDC ON is off, and the alarm is set. The
oscillating output condition means that the unit alternates between briefly idle and output on (the
VDC ON indicator will appear dim as it goes on and off, and the toggling relay will be audible).
If position 7 of SW1 is set to on (see PAR. 3.1) so that the VDC ON indicator is powered from the
internal power supply, when a slave is idle, the output is off, VDC ON lights red, and the alarm is
set. The oscillating output condition means that the unit alternates between briefly idle and output
on (the VDC ON indicator will toggle between briefly amber and green, and the toggling relay will
be audible).
5.3.1 MINIMUM LOAD (W MODELS)
The minimum load (Amperes) = N x (I/10) where
N = the number of units in parallel,
I = Nominal current rating of individual power supply (Amperes).
For applications requiring no load or lower than minimum load conditions, see voltage set restric-
tions of PAR. 5.3.2. Load effect specifications will not be met when units are operated in redun-
dant mode with load less than 10% per unit.
For loads less than 10%, voltage stabilization may be affected if units are turned off and on via the
front panel, causing voltage on the paralleled bus to rise as high as 8% for 5 seconds maximum.
This can be avoided by using the remote on-off feature to turn the units off and on.
5.3.2 VOLTAGE SET RESTRICTIONS (W MODELS)
To avoid slave “idle” all parallel-connected units’ output voltage must be set within 1% or 200mV
of each other (whichever is lower) and be at least 80% of their nominal (rated) output voltage
(90% for 48V model).