KEPCO HSF 5-60 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. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL [phone] FAX [phone]
email: [e-mail] World Wide Web: http://www.kepcopower.com
An ISO 9001 Company.
HSF 300W
©2015, KEPCO, INC
P/N 228-1696-r3
HSF 300W
POWER SUPPLY
HSF 300W
POWER SUPPLY
SINGLE OUTPUT POWER SUPPLIES
SINGLE PHASE, POWER FACTOR CORRECTED
UNIVERSAL AC INPUT
HSF 5-60, HSF 12-27, HSF 15-22,
HSF 24-14, HSF 28-12, HSF 48-7

iHSF 300W 042315
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
2. Specifications.................................................................................................................................................... 2
3. Features......................................................................................................................................................... 5
3.1 DIP Switch Configuration ............................................................................................................................... 5
3.2 Front Panel Access........................................................................................................................................ 6
3.3 Keying ............................................................................................................................................................ 6
3.4 Output Voltage Control................................................................................................................................... 7
3.4.1 Front Panel Voltage Control........................................................................................................................ 7
3.4.2 Remote Voltage Control.............................................................................................................................. 7
3.5 Remote On-Off............................................................................................................................................... 8
3.6 Protection Circuits.......................................................................................................................................... 9
3.6.1 Overvoltage And Overtemperature Protection ............................................................................................ 9
3.6.2 Overcurrent Setting and Protection............................................................................................................. 9
3.6.3 Fan Failure .................................................................................................................................................. 9
3.6.4 Undervoltage............................................................................................................................................. 10
3.7 Alarm Settings.............................................................................................................................................. 10
3.7.1 Visual Alarm. ............................................................................................................................................. 10
3.7.2 Alarm Signals. ........................................................................................................................................... 10
3.7.2.1 Internal Isolated Relay Alarm ................................................................................................................. 10
3.7.2.2 Optically-Coupled Logical Alarm ............................................................................................................ 10
3.8 VDC ON/Alarm Indicator Power Options...................................................................................................... 11
3.9 Local/remote Sensing................................................................................................................................... 12
3.10 Retaining Latches......................................................................................................................................... 12
4. Load Connection............................................................................................................................................. 12
5. Connecting Multiple Power Supplies............................................................................................................... 12
1 HSF Rear Panel Connector and RA 19-4C Rack Adapter I/O Connector.................................................. 1
2 Power Rating Vs. Temperature.................................................................................................................. 3
3 Mechanical Outline Drawing Of The HSF 300W Power Supply................................................................. 5
4 DIP Switch Configuration............................................................................................................................ 6
5 Front Panel Controls, Indicators and Test Points....................................................................................... 7
6 DIP Switch Settings for Control of Output Voltage ..................................................................................... 8
7 Connections For Remote Voltage Control.................................................................................................. 8
8 DIP Switch Settings for Using RESET button or Remote ON-OFF............................................................ 9
9 DIP switch settings for Optically Coupled Logical Alarm.......................................................................... 10
10 Output Alarm Circuit Optically Isolated..................................................................................................... 11
11 ±PF Power Failure Optocoupler Timing Diagram..................................................................................... 11
12 DIP switch settings for VDC ON/ALARM Power Options......................................................................... 11
1 HSF (M) Rear Connector Pin Assignments ................................................................................................1
2 Output Ratings and Specifications ..............................................................................................................2
3 Power Supply Ratings and Specifications ..................................................................................................3
4 Minimum Conditions for Relay, Meter and LED Operation .........................................................................8

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
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+ (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
89 7
12 11 10
15
18 16
17
14 13
21 20 19
21
34
56
22
23
24

2HSF 300W 042315
2. SPECIFICATIONS
Table 2 contains specifications and operating limits of individual HSF 300W Series models. Table
3 contains specifications and operating limits common to all HSF 300W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
+PF 16 +Power Fail of open-collector alarm circuit. Used with –PF, pin 19 (see PAR. 3.7.2.2).
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. 3.7.2.2).
+RC 20 +Remote On-off used with –RC, pin 21, to allow remote turn-on turn-off of the unit (see PAR. 3.5)
–RC 21 –Remote On-off used with +RC, pin 20, to allow remote turn-on turn-off of the unit (see PAR. 3.5)
GND 22 AC input ground
N 23 AC Input neutral
L 24 AC input line
TABLE 2. OUTPUT RATINGS AND SPECIFICATIONS
HSF MODEL 5-60 12-27 15-22 24-14 28-12 48-7
Output Volts d-c (nominal) 5 12 15 24 28 48
Output
Adjustment
Range(1)
Using either front panel
trimpot, Voltage source or
external 5K ohm trimpot
(Volts d-c)(2) 0 to 5.5 0 to 13.8 0 to 17.4 0 to 28.2 0 to 33 0 to 52.2
Output Current (nominal) (Amps) 60 27 22 14 12 7
Maximum Output Power (Watts)(3) 300 300 300 300 300 300
Overcurrent Setting (Amps)(4) 63-78 28.4-35.1 23.1-28.6 14.7-18.2 12.6-15.6 7.4-9.1
Short Circuit Current (Amps) 82 35 29 20 17 11
Overvoltage Protection (OVP)
(Volts d-c)(5) 5.7 - 7.0 14.3 - 16.8 18.0 - 24.0 29.3 - 33.6 34.2 - 39.2 54.5 - 59.8
Efficiency
(% typ.) AC Input 100V 72 74 75 78 78 79
AC Input 200V 78 78 79 82 82 83
Power Fac-
tor
(typ.)
AC Input 100V 0.99 0.99 0.99 0.99 0.99 0.99
AC Input 200V 0.95 0.95 0.95 0.95 0.95 0.95
Ripple &
Noise(6)
(mV, p-p)
ripple 80 120 120 150 150 200
ripple noise 120 150 150 200 200 200
(1) To adjust output voltage down to approximately 0V use external voltage source or resistance (see PAR. 3.4.2). Refer to Table
4 for minimum conditions required to maintain proper operation of alarm relay and visual LED indicator.
(2) Using trimpot to attain voltages outside the specified adjustment range may trigger undervoltage (PAR 3.6.4) or overvoltage
(PAR 3.6.1) faults. Recovery is by removing, and after approximately 40 seconds, reapplying AC input power or by reset
(open and close) at ±RC terminals (no delay).
(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.
TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS (CONTINUED)
Signal
Name Pin Function

HSF 300W 042315 3
FIGURE 2. POWER RATING VS. TEMPERATURE
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS
CHARACTERISTIC SPECIFICATION CONDITION/NOTES
Input Voltage Nominal: 100-120V a-c, 200-240V a-c
Range: 85-265V a-c, 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) 4.4A rms max. 100 - 120V a-c
2.2A 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 10.0A at
250 Volts
Input Surge cold start, interval > 30
sec (First surge only, not including
current flow into EMI filter)
15A typ., 20A max. first surge 100 - 120V ac
30A typ., 40 max. first surge 200- 240 V ac
Leakage Current: 0.24mA typ., 0.3mA max. 120V a-c, 60Hz per IEC 950 and UL1950
0.31mA typ., 0.38mA max. 240V a-c, 60Hz per IEC 950 and UL1950
Power Factor 0.99 typical Rated output, rated input
Transient Recovery excursion
characteristic ±4% maximum 50% to 100% load,
transient time >50sec
recovery time 1 ms maximum
Stabilization
Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum
Maximum: ±1% (default, 85 to 132V a-c, 170 to 265V a-c
Load Effect ±0.3% Typical, ±2% Maximum (default)
±0.3% Typical, ±0.6% Maximum (see PAR. 3.8) Individual Mode: 0%-100% load change
Current Sharing: 10%-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
150 msec Typical, 210 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

4HSF 300W 042315
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. 3.5).
Operating Temperature: -10 to 40°C (see Figure 2.)
Startup Temperature -10 to -20°C (see Figure 2.)
Storage Temperature: -30°C to +75°C
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: Designed to meet UL: 60950; CSA:C22.2 60950; TUV: EN60950.
RoHS Compliance Contact Kepco Sales for further information.
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 (HSF 5-60M: level 3) normal operation
Electrical fast transient burst: EN61000-4-4 level 3 normal operation
Surge withstand: EN61000-4-5, level 4 (HSF 5-60M: level 3) No damage
Power Frequency Magnetic Field: EN61000-4-8, level 4 (HSF 5-60M: level 3) 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 8 lbs, 3.7Kgs. maximum
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
CHARACTERISTIC SPECIFICATION CONDITION/NOTES

HSF 300W 042315 5
FIGURE 3. MECHANICAL OUTLINE DRAWING OF THE HSF 300W POWER SUPPLY
3. FEATURES
3.1 DIP SWITCH CONFIGURATION
The HSF 300W 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. 3.5).
• 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).
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].
3043321
15V12V
= PIN PRESENT
= PIN MISSING
KEYING
DETAIL "A"
SEE DETAIL "A"
24V 28V 48V
AIRFLOW
5V
5.218[132.5]
4.288 [108.9]

6HSF 300W 042315
• Position 7 of SW1 either enables (default) or disables using the internal power supply
reference voltage to power the DC ON/ALARM indicator. Position 8 of SW2 either dis-
ables (default) or enables using the HSF output voltage to power the DC ON/ALARM
indicator (requires minimums per Table 4 if enabled) (see PAR 3.8).Only one of these
two must be enabled, the other disabled.
• Position 8 of SW1 either disables (default) or enables the visual alarm indication (see
PAR. 3.7.1).
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. 3.5), the OUTPUT RESET button restores output power
in the event that overcurrent or overvoltage protection has tripped, or thermal overload or fan mal-
function 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.
3.3 KEYING
Keying of the HSF 300W 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.
OFF ON
OFF ON
ALARM LED DISABLE
DC ON PWR BY REF
-PF
+PF
-RC
+RC
RV
REF
3043278
88
8
SW1
SW2
4
6
7
5
2
3
1
4
4
5
6
76
7
5
1
2
32
3
1
DC ON PWR BY OUTP V 8
-RC 4
+PF
-COM
-PF 6
7
5
REF
+RC
RV 2
3
1
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
- DC ON PWR BY REF ENABLED
NOTE: NOT ALL COMPONENTS SHOWN.
DETAIL VIEW
SW1SW2
SEE DETAIL VIEW
TAB

HSF 300W 042315 7
• VDC ON/ALARM indicator. Lights green when unit is operating. When enabled by DIP switch config-
uration, lights red to indicate loss of output voltage in parallel configuration only (see PAR. 3.7.1).
• 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).
• TEST POINT (+, –): Connect to voltmeter to monitor d-c output voltage.
• 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. 3.5).
• POWER ON/OFF switch. Applies power to the unit. CAUTION: Power must be OFF before unit is
removed from the rack adapter.
• Retaining Latches (2). Prevents inadvertent removal of unit from rack adapter (see PAR. 3.10).
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.
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 300W 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.
3043322
VDC ON/ALARM Indicator
V. ADJ Output Voltage Adjustment Trimmer
TEST POINT (+)
TEST POINT (-)
OUTPUT RESET switch
POWER ON/OFF switch
Retaining Latches

8HSF 300W 042315
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 7A, Resistor R is used to obtain minimum output volt-
age 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, meter and LED indicators, 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.
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
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 8B. 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 4. MINIMUM CONDITIONS FOR RELAY, METER AND LED OPERATION
HSF MODEL 5-60(2) 12-27 15-22 24-14 28-12 48-7
Minimum HSF output voltage required for continuous
relay and LED functioning (Volts d-c) 4.0 5.5 6.5 6.5 6.5 6.5
Minimum resistance of Limit resistor R (Figure 7A) in
series with 5K ohm Trimpot to ensure proper operation
of LEDs and relay (Ohms).(1) 5K 1.9K 1.8K 1.1K 930 610
Minimum external voltage (Figure 7B) to ensure proper
operation of LEDs, meter and relay. (Volts d-c).(1) 4.0 2.2 2.16 1.35 1.16 0.67
Voltage source range (Volts d-c) 0 - 6 0 - 6 0 - 6 0 - 6 0 - 6 0 - 5.5
(1) - If operating below minimums listed, see PAR. 3.7.2.2 to implement ±PF alarm signals to monitor power supply status.
(2) -LED brightness of HSF 5-60 is dimmer than other models. This is normal.
OFF
SW1
3043279
COM 7
REF 1
RV 2
7
SW2
1
ON
21
2
OFF 1 REF
2 RV
ON
SW1SW2
7
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
TAB

HSF 300W 042315 9
“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 300W 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 8A) if remote ON-OFF is not used.
The ±RC pins are isolated from DC output pins and a-c input terminals.
FIGURE 8. DIP SWITCH SETTINGS FOR USING RESET BUTTON OR REMOTE ON-OFF
3.6 PROTECTION CIRCUITS
The following protection features are implemented in the HSF 300W 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 300W 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 300W 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. 3.5), 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 300W 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.
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. 3.5), open the connection between the
±RC pins and then reconnect the pins. The unit may also be restarted by turning the POWER ON/
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
TAB

10 HSF 300W 042315
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. 3.5), 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); requires minimums per Table 4 if enabled (see PAR 3.8).
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 9A 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).
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 9B. Use this option if the power supply will operate below the minimum voltages speci-
fied in Table 4.
FIGURE 9. DIP SWITCH SETTINGS FOR OPTICALLY COUPLED LOGICAL ALARM
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
TAB

HSF 300W 042315 11
The logic alarm circuit is a diode transistor optical coupler (see Figure 10). 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 11 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 10. OUTPUT ALARM CIRCUIT OPTICALLY ISOLATED
FIGURE 11. ±PF POWER FAILURE OPTOCOUPLER TIMING DIAGRAM
3.8 VDC ON/ALARM INDICATOR POWER OPTIONS
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 12A). Load effect is
±1% maximum. To use the HSF output voltage to power the VDC ON/ALARM indicator, set Position
7 of SW1 to OFF and Position 8 of SW2 to ON (see Figure 12B). Load effect is ±0.6% maximum,
however the minimums specified in Table 4 must be observed for the indicator to function.
FIGURE 12. DIP SWITCH SETTINGS FOR VDC ON/ALARM POWER OPTIONS
3043492
7
7 DC ON PWR BY REF 7
SW1
8
SW2 8
OFF ON OFF ON
USE REFERENCE SUPPLY
(FACTORY DEFAULT)
TO POWER "DC ON"
A
TO POWER "DC ON"
USE HSF OUTPUT VOLTAGE
B
(REQUIRES MINIMUM OUTPUT VOLTAGE)
7
8
8SW1
7
SW2
OFF ON ON
OFF
DC ON PWR BY OUTPUT V 8
87
7
88
7
TAB

12 HSF 300W 042315
3.9 LOCAL/REMOTE SENSING
HSF 300W 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.
3.10 RETAINING LATCHES
HSF 300W 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).
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.
NOTE: If parallel-connected units are controlled individually, either a minimum load or voltage
set restrictions are required to avoid slave “idle” or slave “oscillating output” conditions
(When the slave is idle, the output is off, no lights are lit, and the alarm is set.) If the
minimum load is maintained, voltage set restrictions are not required.
Minimum Load: 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 refer to the Volt-
age Set Restrictions specified below. Load effect specifications will not be met when
units are operated in redundant mode with load less than 10% per unit.
Voltage Set Restrictions: 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).