KEPCO HSF 5-60, HSF 12-27, HSF 15-22, HSF 24-14, HSF28-12 Operator's Manual

KEPCO®

THE POWER SUPPLIER™

OPERATOR’S MANUAL

HSF 300W

POWER SUPPLY

SINGLE OUTPUT POWER SUPPLIES

SINGLE PHASE, POWER FACTOR CORRECTED

UNIVERSAL AC INPUT

KEPCO INC.

An ISO 9001 Company.

POWER SUPPLY

HSF 5-60, HSF 12-27, HSF 15-22,

HSF 24-14, HSF 28-12, HSF 48-7

IMPORTANT NOTES:

1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.

HSF 300W

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 num­bers. 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 Docu­mentation 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. Reprod uction of any part can be

made only with the specific written permission of Kepco, Inc.

Data subject to change without notice.

MODEL

HSF 300W

©2015, KEPCO, INC
P/N 228-1696-r3

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

TABLE OF CONTENTS

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

SECTION PAGE

LIST OF FIGURES

FIGURE TITLE PAGE

TABLE TITLE PAGE

i HSF 300W 042315

LIST OF TABLES

1. INTRODUCTION

3042951

89

7

12 11

10
15
18 16

17

14

13

21 20

19

21

34

56

22

23

24

1.1 SCOPE OF MANUAL

This Operator's Manual covers the installation and operation of the Ke pco 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 sup­plies 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 1 9-4C rack adapte rs. 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

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

HSF 300W 042315 1

Pin Function

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).

TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS (CONTINUED)

Signal
Name

+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

Pin Function

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.

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

Output Current (nominal) (Amps)

Maximum Output Power (Watts)

Overcurrent Setting (Amps)

Short Circuit Current (Amps) 82 35 29 20 17 11

Overvoltage Protection (OVP)

Efficiency

(% typ.)

Power Fac-

tor

(typ.)

Ripple &

Noise

(mV, p-p)

(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.

Using either front panel

trimpot, Voltage source or

external 5K ohm trimpot

(1)

(6)

(Volts d-c)

(Volts d-c)

(5)

AC Input 100V 72 74 75 78 78 79
AC Input 200V 78 78 79 82 82 83
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 80 120 120 150 150 200

ripple noise 120 150 150 200 200 200

(2)

(3)

(4)

0 to 5.5 0 to 13.8 0 to 17.4 0 to 28.2 0 to 33 0 to 52.2

60 27 22

300 300 300 300 300 300

63-78 28.4-35.1 23.1-28.6 14.7-18.2 12.6-15.6 7.4-9.1

5.7 - 7.0 14.3 - 16.8 18.0 - 24.0 29.3 - 33.6 34.2 - 39.2 54.5 - 59.8

14 12 7

2 HSF 300W 042315

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

Input Source Frequency Nominal: 50-60 Hz

Input Current: (Maximum Load At
25°C with Nominal Output Voltage)

Switching Frequency 140KHz typ. Forward Converter
Input Protection A limiting resistor in series with a resistor fuse (and thyristor circuit) reduces start-up surge.

Input Surge cold start, interval > 30

sec ( First surge only, not including

current flow into EMI filter)
Leakage Current: 0.24mA typ., 0.3mA max. 120V a-c, 60Hz per IEC 950 and UL1950

Power Factor 0.99 typical Rated output, rated input
Transient Recovery excursion

characteristic

recovery time 1 ms maximum

Stabilization

Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum

Load Effect ±0.3% Typical, ±2% Maximum (default)

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

Output Hold-up Time 30 msec Typical, 20 msec Minimum. 100V a-c

Range: 85-265V a-c, 110-370V d-c

Range: 47-440 Hz

4.4A rms max. 100 - 120V a-c

2.2A rms max. 200 - 240V a-c

The internal power supply is protected against shorts by an input fuse. Fuse value 10.0A at
250 Volts

15A typ., 20A max. first surge 100 - 120V ac
30A typ., 40 max. first surge

0.31mA typ., 0.38mA max. 240V a-c, 60Hz per IEC 950 and UL1950

±4% maximum

Maximum: ±1% (default,

±0.3% Typical, ±0.6% Maximum (see PAR. 3.8)

150 msec Typical, 210 msec Maximum 240V a-c

40 msec Typical, 20 msec Minimum. 240V a-c

0 to 100% load, -10 to 40°C
0 to 100% load, -10 to 40°C

At 440 Hz leakage current exceeds

UL/VDE safety spec. limit.

200- 240 V ac

50% to 100% load,

transient time >50

85 to 132V a-c, 170 to 265V a-c

Individual Mode: 0%-100% load change

Current Sharing: 10%-100% load change

sec

HSF 300W 042315 3

TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)

CHARACTERISTIC SPECIFICATION CONDITION/NOTES

Overvoltage Protection When the Power Supply goes into an overvoltage condition, the output is cut OFF. See PAR.

Remote Control ON/OFF: ±RC pins control on/off as follows:

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)

Insulation Resistance: (at 25°C,
65% relative humidity)

Humidity: 10% to 95% relative humidity, noncondensing,

Vibration: 5-10 Hz., 10mm amplitude, 10-55 Hz., accelera-

Shock: Acceleration: 643.5ft./s

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:
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
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

3.6.1.
Must be enabled by DIP switch positions 3

“High”, 2.4V to 24V (or open), unit OFF- Fan Off;

and 4 (see PAR. 3.5).

“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.

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
100 Megohms minimum (500Vdc)

Between output and ground, input and

ground, and input and output,

Wet Bulb temperature <35°C

tion 64.3ft./s

2

(19.6M/s2) (2g)

2

(196.1M/s2 ) (20g),

Pulse Duration: 11ms ± 5 msec

operating and non-operating

non-operating 1 hr. on each of 3 axes,

sweep time 10 minutes

(non-operating, 1/2 sine pulse, three

shocks on each axis, Power Supply is

fixed on its bottom side)

Designed to meet EN61000-3-2

EN61000-4-11 normal operation

4 HSF 300W 042315

1.500
[38.1]

0.093 [2.4]

14.667 [372.5]

5

.

0

4

0

[

1

2

8

.

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

.

2

1

8

[

1

3

2

.

5

]

4.288 [108.9]

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 Figu re 4), which must
be configured before the unit is installed in the rack adapter. The DIP switches control the follow­ing 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-

HSF 300W 042315 5

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).

• Position 7 of SW1 either enables (default) or disables using the internal power supply

OFF

ON

OFF

ON

ALARM LED DISABLE

DC ON PWR BY REF

-PF

+PF

-RC

+RC

RV

REF

3043278

8

8

8

SW1

SW2

4

6
7

5

2
3

1

4

4
5

6
7

6
7

5

1
2
3

2
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

reference voltage to power the DC ON/ALARM indicator. Position 8 of SW2 either dis­ables (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 disa bles (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" indica­tor 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 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.

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 r ack adapter are b locked
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.

6 HSF 300W 042315

• VDC ON/ALARM indicator. Lights green when unit is operating. When enab led by DIP switch config-

3043322

VDC ON/ALARM Indicator
V. ADJ Output Voltage Adjustment Trimmer

TEST POINT (+)

TEST POINT (-)

OUTPUT RESET switch

POWER ON/OFF switch

Retaining Latches

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 alar m 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), a nd –COM (pin 10) to the trim mer control or external
voltage source.

HSF 300W 042315 7

NOTE:If remote voltage control is not implemented, the factory default for positions 1, 2 and 7 of DIP

OFF

SW1

3043279

COM 7

REF 1

RV 2

7

SW2

1

ON

2

1
2

OFF

1 REF
2 RV

ON

SW1SW2

7

1

2

OFF

ON

1
2

OFF

ON

USING Vadj CONTROL

FRONT PANEL VOLTAGE CONTROL

A

B

(FACTORY DEFAULT)

REMOTE VOLTAGE CONTROL

OR VOLTAGE SOURCE

USING EXTERNAL TRIMPOT

COM 7

REF 1

RV 2

2 RV

1 REF

TAB

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.

RESIST ANCE: Connect the external trimmer as shown in Figure 7A. Suggested value for the trim­mer control is 5K ohms. Referring to Figure 7A, Resistor R is use d to obtain minimum outp ut 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 opera t io n 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.

TABLE 4. MINIMUM CONDITIONS FOR RELAY, METER AND LED OPERATION

HSF MODEL

Minimum HSF output voltage required for continuous
relay and LED functioning (Volts d-c)

Minimum resistance of Limit resistor R (Figure 7A) in
series with 5K ohm Trimpot to ensure proper operation
of LEDs and relay (Ohms).

Minimum external voltage (Figure 7B) to ensure proper
operation of LEDs, meter and relay. (Volts d-c).

(1)

(1)

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.

(2)

5-60

12-27 15-22 24-14 28-12 48-7

4.0 5.5 6.5 6.5 6.5 6.5

5K 1.9K 1.8K 1.1K 930 610

4.0 2.2 2.16 1.35 1.16 0.67

3.5 REMOTE ON-OFF

When power is ON at the source, the output may be turned ON or OFF using the ±R C 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

FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL

and 4 as shown in Figure 8B. The +RC and –RC signals (at the rack ad apter 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

8 HSF 300W 042315

“high” and 0.0 to 0.4V “low”), or a contact closure. When the ±RC pins are open, using either a

3042877

3

3 +RC

+RC 3

3

SW1

-RC 4

4

SW2

4

4 -RC

OFF

ON OFF

ON

(FACTORY DEFAULT)

USE FRONT PANEL

RESET BUTTON

A

B

(LOGICAL LEVEL OR

MECHANICAL SWITCH)

USE REMOTE ON-OFF

3

3

SW2 SW1

4

4

ON

OFF

OFF

ON

3 +RC
4 -RC

+RC 3

-RC 4

TAB

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 bo th 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 undervolt­age (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

3.6.2 OVERCURRENT SETTING AND PROTECTION

3.6.3 FAN FAILURE

HSF 300W 042315 9

When the output voltage of the HSF 300W Power Supp ly 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 p ins and then reco nnect 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.

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 tha n 30 seconds . After the cause of overcurrent is removed, the power supply output is auto­maticall y 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.

A cutoff of the fan supply voltage or a decrease in fan speed causes the output to sh ut 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/

OFF switch to OFF, waiting 40 seconds, then setting the POWER switch to ON. If fan rotation is

3042878

55 +PF

+PF 5

5

SW1

-PF 6

6

SW2

6

6 -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

ONONOFF

+PF 5

-PF 6

6 -PF

5 +PF

TAB

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 mini­mum values listed in Table 4, refer to PAR. 3.7.2.2 to configure the optically-coupled ala rm.

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). Th ese con­tacts 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 posi­tions 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 sig nals, +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 speci­fied in Table 4.

FIGURE 9. DIP SWITCH SETTINGS FOR OPTICALLY COUPLED LOGICAL ALARM

10 HSF 300W 042315

The logic alarm circuit is a diode transistor optical coupler (see Figure 10). The transistor is n or-

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

8

SW1

7

SW2

OFF

ON

ON

OFF

DC ON PWR BY OUTPUT V 8

8

7

7

8

8

7

TAB

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 cir­cuit 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 volt­age 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.

HSF 300W 042315 11

FIGURE 12. DIP SWITCH SETTINGS FOR VDC ON/ALARM POWER OPTIONS

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 moun ted
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 ina dvertent 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 s et.) 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 numbe r 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 Volt­age 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).

12 HSF 300W 042315