KEPCO HSF 1500W User Manual

OPERATOR’S MANUAL

HSF 1200W/1500W

POWER SUPPLY

SINGLE OUTPUT POWER SUPPLIES

SINGLE PHASE, POWER FACTOR CORRECTED

UNIVERSAL AC INPUT, OPTIONAL METER

KEPCO INC.

An ISO 9001 Company.

HSF 1200W/1500W

POWER SUPPLY

HSF 24-50, HSF 36-42, HSF 48-32

HSF 24-50M, HSF 36-42M, HSF 48-32M

HSF 24-50C, HSF 36-42C, HSF 48-32C

IMPORTANT NOTES:

1) This manual is valid for the following Model and associated serial numbers:

MODEL SERIAL NO. REV. NO.
HSF 1500W

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. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.

Data subject to change without notice.

MODEL

KEPCO®

©2013, KEPCO, INC
P/N 228-1589-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

THE POWER SUPPLIER™

TABLE OF CONTENTS

SECTION 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 Current Monitor (C and M Suffix only)..................................................................................................... 8

3.6 Remote On-Off........................................................................................................................................ 9

3.7 Protection Circuits ................................................................................................................................... 9

3.7.1 Overvoltage And Overtemperature Protection .................................................................................. 9

3.7.2 Overcurrent/Current Limit Setting and Protection............................................................................ 10

3.7.3 Fan Failure ...................................................................................................................................... 10

3.7.4 Undervoltage ................................................................................................................................... 10

3.8 Alarm Settings....................................................................................................................................... 10

3.8.1 Visual Alarm. ................................................................................................................................... 10

3.8.2 Alarm Signals. ................................................................................................................................. 10

3.8.2.1 Internal Isolated Relay Alarm..................................................................................................... 10

3.8.2.2 Optically-Coupled Logical Alarm................................................................................................ 11

3.9 Retaining Latches ................................................................................................................................. 12

4. Load Connection.............................................................................................................................................. 12

5. Connecting Multiple Power Supplies................................................................................................................ 12

LIST OF FIGURES

FIGURE TITLE PAGE

1 RA 19-4C Rack Adapter I/O Connector...................................................................................................... 1

2 Power Rating Vs. Temperature .................................................................................................................. 3

3 Mechanical Outline Drawing Of HSF 1200W/1500W 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 .................................................................................................. 9

8 DIP Switch Settings for Using RESET button or Remote ON-OFF ............................................................ 9

9 DIP switch settings for Optically Coupled Logical Alarm .......................................................................... 11

10 Output Alarm Circuit Optically Isolated..................................................................................................... 11

11 ±PF Power Failure Optocoupler Timing Diagram..................................................................................... 11

12 Correct and incorrect Methods of Load Connection ................................................................................. 12

LIST OF TABLES

TABLE TITLE PAGE

1 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

i HSF 1500W 022613

1. INTRODUCTION

1.1 SCOPE OF MANUAL

This Operator's Manual covers the installation and operation of the Kepco HSF 1200W/1500W
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 (see nameplate of the unit).

1.2 DESCRIPTION

The Kepco HSF1500 Watt Series are hot swappable, high frequency switching, plug-in power
supplies. Metered models (M suffix) are completely interchangeable with the non-metered HSF
Series. Three models may be selected for outputs of 24V (1200W), 36V or 48V (1500W). 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
265V a-c), 50-60Hz (input frequency range 47-440Hz). A built-in current balancing circuit and OR­ing 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 1200W (24V) or 1500W (36V, 48V) modules. All input/
output connections are through a 24-pin connector that plugs in to the rack adapter. All external
connections are made through the rack adapter’s I/O connector (see Figure 1).

An optional meter (M suffix) provides digital indication of voltage or current (switch selectable)
from the front panel. An optional current sense resistor (C suffix) allows external current monitor­ing within 3% (contact Kepco if greater accuracy is required). RoHS-compliant models indicated
by HSF* (e.g., HSF 24*50M).

+IMON

REF

(NOT USED)

CSB

+PF
ALARM (NC)
ALARM (NO)

-RC

1
2
3
4
5
6
7
8

9

-IMON

-COM

10
11

(NOT USED)

12

RV

13

-PF

14

ALARM (COM)

15

+RC

3042866

FIGURE 1. RA 19-4C RACK ADAPTER I/O CONNECTOR

TABLE 1. REAR CONNECTOR PIN ASSIGNMENTS

Signal
Name

Output + 1, 2, 4 DC output (+) applied to load.

Output – 3, 5, 6 DC Output (–) applied to load.

IMON+ 8 Current Monitor+ (used on C and M suffix only).

NO 10 Normally Open contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.8.2).

IMON– 11 Current Monitor– (used on C and M suffix only).

–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. 3.8.2).

AL COM 14 Common contact of alarm relay (see PAR. 3.8.2).

REF 15 Reference voltage. When used with RV, pin 18, allows all output voltages of paralleled slave supplies to be

+PF 16 +Power Fail of open-collector alarm circuit. Used with –PF, pin 19 (see PAR. 3.8.2).

CSB 17 Current Share Bus - Used whenever several power supplies are connected in parallel (see PAR. 5.).

HSF 1500W 022613 1

Pin Function

controlled by one voltage adjustment of a master power supply. When REF is connected to RV, the front
panel Vadj control determines output voltage. Connections are made via DIP switches (see PAR. 3.1).

TABLE 1. REAR CONNECTOR PIN ASSIGNMENTS (CONTINUED)

Signal

Name

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. 3.8.2).

+RC 20 +Remote On-off used with –RC, pin 21, to allow remote turn-on turn-off of the unit (see PAR. 3.6)

–RC 21 –Remote On-off used with +RC, pin 20, to allow remote turn-on turn-off of the unit (see PAR. 3.6)

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 1200W/1500W Series mod­els. Table 3 contains specifications and operating limits common to all HSF 1200W/1500W Series
Models. These specifications are at nominal input voltages at 25°C and apply to all models unless
otherwise specified.

TABLE 2. OUTPUT RATINGS AND SPECIFICATIONS

MODEL HSF 24-50 HSF 36-42 HSF 48-32

Output Volts d-c (nominal)

Front panel Trimpot (Volts) 16.8-30.5 15.0-48.0 33.6-54.0

Adjustment Range

5K ohm Trimpot with RV terminal (Volts) 16.8-30.5 6.0-48.0 33.6-54.0

Using Voltage source (Volts) 18 - 30 6.1-54 33.6 - 55.2

Voltage source range (Volts) 3.5 - 6.5 0-5.75 3.5 - 5.75

Maximum

Output

(1)

Ratings

(A,W)

Overvoltage

Protection Level

Current Limit Set-

ting (Amps)

At power module output terminals (Volts) 32-35 56-60 56-60

(5)

(2)

Efficiency

% typical

Ripple & Noise

(6)

(mV, p-p)

Sense Resistor (I

) values (Ohms) 0.002 0.002 0.005

Mon
(1) See Figure 2 for power derating vs. temperature and input voltage.
(2) Current limit value determined by the combination of input voltage and output voltage setting. For example, if RKE 48-23K is

operated at 120V a-c and output voltage is set at the minimum of output range (33.6V), current limit is closer to the maximum
specified value of 36.8A. For the same input voltage (120Vac) if output voltage is set at maximum (55.0V), then the current limit
value is closer to 20A (the minimum current limit value specified for input voltage range 90-170V a-c).

(3) Winker (intermittent) Operation; after cause is removed, output voltage restored automatically, however for some combinations

of input voltage and output voltage and current limit characteristics may be square type: see note (4) below.

(4) Square type. Unit first enters Current Limit; output voltage starts to drop (nearly square curve). If cause is removed while in Cur-

rent Limit, output voltage restores automatically. If current continues to increase, Overcurrent is triggered. If Overcurrent is com­bined with an output voltage drop below 60% of rated output voltage (below 5V for 36V model), the unit shuts OFF. Recovery is
by removing, then reapplying input power after more than 30 seconds or by opening and (without waiting) reclosing the RC ter-

minals using either the front panel RESET button or an external remote switch.
(5) When overvoltage is detected, output is shut OFF.
(6) Ripple and noise levels above are satisfied when conditions are 0 to 100% load, 0 to 65°C (load is derated from 50 to 65°C, see

Figure 2), and bandwidth ≤100MHz.

24 36 48

85-90V a-c Input: 30-35A/720-840W N/A N/A

85-95V a-c Input: N/A 21-25.2A/756-907W 16-19.2A/(768-922W)

90-170V a-c Input: 35A/840W N/A N/A

95-170V a-c Input: N/A 25.2A/907W 19.2A/922W

170-265V a-c Input: 50A/1200W 42A/1512W 32A/1536W

85 - 90V a-c input 31-57.5

90 - 170V a-c input 36-57.5

170 - 265V a-c input 52.5-57.5

(3)

(3)

(4)

22.3-48.3

26-48.3

44.1-48.3

(3)

(3)

(4)

17-36.8

20-36.8

33.6-36.8

AC Input 100V 83 81 85

AC Input 200V 85 86 88

ripple 250 350 350

ripple noise 350 450 450

(3)

(3)

(4)

2 HSF 1500W 022613

NOTE: Safety agency approvals apply only to operation between

-10°C and 40°C.

THE POWER SUPPLY WILL STARTUP
BETWEEN -20 AND -10°C BUT MAY NOT
MEET PUBLISHED SPECIFICATIONS.

(*)

100

)

90

%
(

80

g
n

i

70

t
a

R

60

r
e

50

w
o

40

P
t
u

30

p

t
u

20

O

10

24V MODEL

36 V MODEL
48 V MODEL

-10 0 10 20 30 40 50 60 65-20

Ambient Temperature (°)

POWER RATING VS. TEMPERATURE

POWER RATING VS. INPUT VOLTAGE

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: 85-264V a-c

Input Source Frequency Nominal: 50-60 Hz

Range: 47-440 Hz

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

13A rms max. (12A max. for 24V model) 100 - 120V a-c

10A rms max.
(8A rms max for 24V model)

Switching Frequency 140KHz 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 25.0A 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 a-c

30A typ., 40 max. first surge

Leakage Current: 0.30mA 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,

0.95 typical 200V a-c, max load, nominal output

Transient Recovery excursion

±4% maximum

characteristic

recovery time 1 ms maximum

Stabilization

Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum 85 to 132V a-c, 190 to 264V a-c

Load Effect 24V Model: ±2.5% Typical, ±3.0% Maximum

48V Model: ±1.5% Typical, ±2.0% Maximum

Temperature Effect ±0.5% Typical, ±1.0% Maximum –10° to 40°C

Combined Effect ±1.6% Typical, ±3.2% Maximum Source, Load and Temperature

Time Effect 0.2% Typical, 0.5% Maximum (8 hours at 25°C)

Start-up Time 300 msec Typical, 450 msec Maximum 100V a-c

250 msec Typical, 400 msec Maximum 200V 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 - 240V a-c

200- 240 V a-c

per EN 61000-3-2

per EN 61000-3-2

50% to 100% load,

transient time >50

µsec

0%-100% load change36V Model: ±2.0% Typical, ±2.5% Maximum

HSF 1500W 022613 3

TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)

CHARACTERISTIC SPECIFICATION CONDITION/NOTES

Output Hold-up Time 10 msec Typical, 7 msec Minimum. 100V a-c

10 msec Typical, 7 msec Minimum. 200V a-c

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

Low Voltage Protection If output falls to 60% of rated output (5V for 36V model) for approximately 30 Seconds and

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

Meter (M suffix only) displays volt­age or current; front panel switch­selectable

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: UL 60950-1, 1st Edition, 2007-10-31; CSA C22.2 No. 60950-1-03, 1st Edition, 2006-07;

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 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

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

3.7.1.

overcurrent is triggered, the output is cut OFF. See PAR. 3.7.4.

Must be enabled by DIP switch positions 3

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

and 4 (see PAR. 3.6).
“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.

Voltmeter Accuracy: ±3%
Ammeter Accuracy: ±5% for loads between 10%­100%

Voltmeter reads voltage at test points (will

differ from voltage at load depending on

load cable length).

Ammeter accuracy degrades significantly

for loads less than 10%

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)

EN 60950.

Designed to meet EN61000-3-2

EN61000-4-11 normal operation

4 HSF 1500W 022613

0.690 [17.5]

14.667 [372.5]

]
0
.
8
2
1
[
0
4
0
.
5

1.500
[38.1]

0.093 [2.4]

0.943 [23.9]

0.085 [2.2]

0.438 [11.1]

0.337 [8.5]

3.353
[85.2]

2.065

0.093
[52.5]

[2.4]

SEE DETAIL "A"

3043140

FIGURE 3. MECHANICAL OUTLINE DRAWING OF HSF 1200W/1500W POWER SUPPLY

3. FEATURES

REAR VIEW

0.090 [2.3]

2.408 [61.2]

0.430 [10.9]

0.093 [2.4]

0.188 [4.8]

3.216 [81.7]

0.127
[3.2]

0.204 [5.2]

0.394

[10.0]

DETAIL "A"

KEYING

24V 36V

= PIN PRESENT
= PIN MISSING

]
5

.
2
3
1

[
8

1
2

.
5

48V

0.606 [15.4]

FRONT VIEW

4.288 [108.9]

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].

FRONT VIEW (M SUFFIX ONLY)

4.288 [108.9]

]
5

.
2
3
1

[
8

1
2

.
5

2.144

[54.46]

3.1 DIP SWITCH CONFIGURATION

The power supply 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 following
parameters:

• Positions 1, 2, and 7 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
combination 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. 3.6) -

• 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. 3.8.2).

HSF 1500W 022613 5

• Position 8 of SW1 either disables (default) or enables the visual alarm indication (see
PAR. 3.8.1).

FACTORY DEFAULT SETTING:

- FRONT PANEL VADJ CONTROL

- RELAY ALARM SELECTED

- VISUAL ALARM DISABLED

- REMOTE ON-OFF DISABLED

REF

RV

+RC 3

-RC
+PF

-PF

-COM
N/A

OFF

ON

1
2

4

5
6

7
8

SW2

OFF

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

SW1

ON

1

3
4

7
8

REF
RV

2

+RC

-RC
+PF

5

-PF

6

-COM
ALARM LED DISABLE

SW1SW2

3042858

TAB

NOTE: NOT ALL COMPONENTS SHOWN.

SEE DETAIL VIEW

DETAIL VIEW

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. 3.6), 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 1; 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 power supply 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.

• VDC ON/ALARM indicator. Lights green when unit is operating. When enabled by DIP switch config­uration, lights red to indicate loss of output voltage in parallel configuration only (see PAR. 3.8.1).

• 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).

• DC output test points (+, –): Connect to voltmeter to monitor output voltage.

6 HSF 1500W 022613

Voltage/Current Meter

(M Suffix only)

Meter Mode switch

(M Suffix only)

V (Voltage) indicator

(M Suffix only)

A (Amperes) indicator

(M Suffix only)

3043129

VDC ON/ALARM Indicator

V. ADJ Output Voltage Adjustment Trimmer

TEST POINT (+)

OUTPUT RESET switch

TEST POINT (-)

POWER ON/OFF switch

Retaining Latches

• OUTPUT RESET switch. Used to recycle power in the event of an alarm condition (see PAR. 3.7).
Not functional when remote on/off control is enabled (see PAR. 3.6).

• 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. 3.9)

• (M Suffix only) Voltage/Current meter: Monitors output voltage or current according to setting of
Meter Mode switch. NOTE: Voltage displayed may differ from voltage at the load depending on lead
length.

• (M Suffix only) Meter Mode slide switch: Set to V for display to show output voltage, set to A to show
output current.

• (M Suffix only) V indicator: Lights green to indicate meter is showing Volts.

• (M Suffix only) A indicator: Lights amber to indicate meter is showing Amperes.

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 1 for the recommended Adjustment
Range.

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,

HSF 1500W 022613 7

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).

It is possible that the 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 trim­mer control is 5K ohms. Referring to Figure 7 (A), R = 7.5K Ohms (M suffix: R = 5.6K Ohms) pro­vides an output voltage adjustment range of from 70 to 130%. for the 24V model. R = 560 Ohms
provides an output voltage adjustment range of from 17 to 150%. for the 36V model. R = 10K
Ohms (M suffix: R = 7.5K Ohms) provides an output voltage adjustment range of from 70 to 115%
for the 48V model.

VOLTAGE. By adjusting an external 3.5 to 6.5V voltage source, the 24V model can be adjusted
from 70 to 130% of the nominal output. By adjusting an external 0 to 5.75V voltage source, the 36V
model can be adjusted from 17 to 150% of the nominal output. By adjusting an external 3.5 to 5.75V
voltage source, the 48V model can be adjusted from 70 to 115% of the nominal output. To ensure
proper operation of the alarm relay, meter (M suffix only) 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

MODEL HSF 24-27 HSF 36-42 HSF 48-32

Minimum HSF output voltage required for relay, meter 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, meter and
relay (Ohms)

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

1 - If operating below minimums listed, see PAR. 3.8.2.2 to implement ±PF alarm signals to monitor power supply status.

1

1

1

17 11 35

7.5K 560 10K

3.7 0.68 3.8

3042875

A

FRONT PANEL VOLTAGE CONTROL

TAB

REF 1

RV 2

COM 7

USING Vadj CONTROL

(FACTORY DEFAULT)

OFF

ON

1
2

7

REMOTE VOLTAGE CONTROL
USING EXTERNAL TRIMPOT

OR VOLTAGE SOURCE

OFF

ON

1
2

7

1 REF
2 RV

7 COM

SW1SW2

OFF

REF 1

RV 2

COM 7

SW2

ON

B

OFF

ON

1

1

2

2

7

7

1 REF
2 RV

7 COM

SW1

FIGURE 6. DIP SWITCH SETTINGS FOR CONTROL OF OUTPUT VOLTAGE

3.5 CURRENT MONITOR (C AND M SUFFIX ONLY)

Current monitor is via ±IMON assigned to pins of the RA 19-4C I/O connector (see Figure 1).
Monitored Output Current (Amps) = Voltage drop across Rs (Volts) x Rs (Ohms), where voltage
drop across Rs (see Table 2) is measured across ± IMON pins (requires millivoltmeter, range 0 to
200mV). Accuracy is ±3%; contact Kepco if greater accuracy is required. There is no isolation
between ±IMON, alarm circuit and d-c output.

8 HSF 1500W 022613

RA 19-4C

RV REF

-COM
J2

I/O 1

1012 2

VOLTAGE

SOURCE

(SEE NOTE)

REMOTE VOLTAGE

CONTROL USING

EXTERNAL VOLTAGE

NOTE: SEE TABLE 4 FOR
MINIMUM VALUE.

LOAD

REMOTE VOLTAGE

CONTROL USING

EXTERNAL RESISTANCE

RA 19-4C

RV REF

HSF SLOT 1

-COM
J2

I/O 1

10212

(SEE TABLE 4
FOR VALUES)

-+ -+

R

LOAD

FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL

3.6 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
“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 power supply 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.

B

ON OFF

ON

TAB

A

USE FRONT PANEL

RESET BUTTON

(FACTORY DEFAULT)

OFF

ON

OFF

ON

USE REMOTE ON-OFF
(LOGICAL LEVEL OR

MECHANICAL SWITCH)

OFF

+RC 3

-RC 4

3042877

3

3

4

4

SW2 SW1

3 +RC

4 -RC

+RC 3

-RC 4

SW2

3

3

4

4

3 +RC
4 -RC

SW1

FIGURE 8. DIP SWITCH SETTINGS FOR USING RESET BUTTON OR REMOTE ON-OFF

3.7 PROTECTION CIRCUITS

The following protection features are implemented in the power supplies: overvoltage and over­temperature (PAR. 3.7.1), overcurrent (PAR. 3.7.2), fan failure (PAR. 3.7.3), and undervoltage
(PAR. 3.7.4). The power supply provides a configurable visual alarm (see PAR. 3.8.1) as well as
an option to use either relay contacts or logic levels for alarm signals (see PAR. 3.8.2)

3.7.1 OVERVOLTAGE AND OVERTEMPERATURE PROTECTION

When the output voltage of the 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. 3.6),
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 30 seconds, then setting the
POWER switch to ON.

HSF 1500W 022613 9

When the internal temperature of the power supply increases beyond safe values, 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 30 seconds, 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 30 sec­onds.

3.7.2 OVERCURRENT/CURRENT LIMIT SETTING AND PROTECTION

From 170 to 265V a-c input, the output characteristic of the power supply is a square type, and the
unit is set to produce an alarm (see PAR. 3.8.2) and shut down if output current exceeds specifica­tions (see Table 2) for more than 30 seconds and undervoltage detection is present (see PAR.

3.7.4). From 85 to 170V a-c input, operation (including alarm signals) is intermittent when current
limit condition occurs. To restart (reset) the unit, remove AC input power, wait 30 seconds, then
reconnect AC input power, or open the RC terminals and then reclose the terminals.

3.7.3 FAN FAILURE

A cutoff of the fan supply voltage 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. 3.8.2). 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. 3.6), 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 30 seconds, then setting the POWER switch to ON. If fan rotation is out of specification
the power supply will not recover.

3.7.4 UNDERVOLTAGE

If the output voltage of the power supply falls below 60 percent of the rated voltage for 30 seconds (5V
for the 36V model) while overcurrent is detected,

the unit turns off and an alarm occurs (either from
the internal relay or optically-coupled alarm circuit, see PAR. 3.8.2). 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. 3.6), 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 30 seconds,
then setting the POWER switch to ON.

3.8 ALARM SETTINGS

3.8.1 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).

3.8.2 ALARM SIGNALS.

Either of two options are available for signalling alarms: isolated relay contacts (factory default,
PAR. 3.8.2.1) or logic level alarm signals ±PF (PAR. 3.8.2.2).

3.8.2.1 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 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).

10 HSF 1500W 022613

3.8.2.2 OPTICALLY-COUPLED LOGICAL ALARM

The second option uses optically-coupled logic level alarm signals (see PAR. 3.8.2.2), +PF (pin 5
of the rack adapter I/O connector) and -PF (pin 13), provided directly from the Kepco RKE power
supply that is the heart of the HSF power supply. 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.

3042878

TAB

+PF 5

-PF 6

A

USE N.O. AND N.C CONTACTS

OF INTERNAL RELAY
(FACTORY DEFAULT)

OFF

SW2

ON

OFF

5

5

6

6

ON

SW1

5 +PF

6 -PF

USE OPTICALLY-COUPLED

OFF

+PF 5

-PF 6

SW2

B

LOGICAL ALARM

(+PF AND -PF)

ON OFF

5

5
6

6

ON

5 +PF
6 -PF

SW1

FIGURE 9. DIP SWITCH SETTINGS FOR OPTICALLY COUPLED LOGICAL ALARM

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

HSF 1500W 022613 11

3.9 RETAINING LATCHES

HSF 1200W/1500W 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 HSP
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 Figure 12 for
the proper way to connect multiple loads.

FIGURE 12. CORRECT AND INCORRECT METHODS OF LOAD CONNECTION

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
power supply. NOTE: Requires minimum of 10% load to operate properly.

• Using series configurations (for increased voltage).

• Using open-on-fail or close-on-fail alarm schemes with multiple power supplies.

12 HSF 1500W 022613