KEPCO HSF-1UR 50W User Manual

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

KEPCO SINGLE OUTPUT, 1U, 50 WATT

HOT SWAP PLUG-IN POWER SUPPLIES

I — INTRODUCTION

The Kepco HSF-1UR, 50 Watt Series hot swappable, high
frequency switching, plug-in power supplies with built-in
power factor correction (PFC) employ forward conversion
and are designed to operate in a fault tolerant power sys­tem with either a-c or d-c input. A thermistor soft-start cir­cuit limits start-up surge. Built-in OR-ing diodes (all models)
and a forced current share circuit (all models except 3.3V)
allow configuration of all models for hot-swap and parallel­redundant N+1 operation. Outputs of 3.3, 5, 12, 15, 24, 28
or 48V are available (see Table 1).

These power supplies are designed to be used with
Kepco’s Series RA 19-1U rack adapters. The RA 19-1U
rack adapter accepts up to four 50 Watt, 100 Watt or 150
Watt units (see Figure 2). 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. I/O signals and implementation of HSF
options are described in detail in the RA 19-1U Rack
Adapter Manual. Surface mount technology permits effi­cient component layout for minimum mounting space.

EMI filtering is designed to meet FCC Class B rating and
VDE 0871 Class B rating. Table 1 contains specifications
that vary for each model of the HSF-1UR 50 Watt Series.
Common specification are listed on page 5.

HSF-1UR

50W SERIES

OPTIONS. There are four options available: T, C, X and Y. Features for all models are the same, except as follows:

The heart of the standard 50W HSF-1UR (no options) mod­els is a Kepco RKW power supply (28V model not avail­able).

T option (-1URT) models use a Kepco RTW power supply
instead of the RKW. T option models weigh less, and have
improved efficiency (input current) specifications. All volt­ages are available.

C option (-1URC) models include a current sensing resis­tor, allowing external current monitoring within ±10% (con­tact Kepco if greater accuracy required). In addition, a 28V
model is available with Option C. All voltages are available.

X option (-1URX) remote control models are identical to T
option, but also include the ability to turn the unit on and off
from a remote location. All voltages are available.

Y option models (-1URY) are identical to T option, but also
include both current monitoring and remote on-off capabili­ties. All voltages are available.

When the input is cut off, the output is maintained for 15
milliseconds minimum (25 for T, C, X and Y models). If the
power supply shuts down due to an output overvoltage
condition, it is then necessary to wait 60 seconds minimum
(30 for T, C, X and Y models) before turning the unit on
again.

II — FEATURES

FRONT PANEL ACCESS. The front panel provides a

power ON/OFF switch controlling input power and a “VDC
ON” light which indicates when the unit is operating. NOTE:

The ON/OFF switch must be set to OFF before remov­ing unit from rack adapter. The front panel “MASTER

ON” LED lights when 1) the unit operates independently, or

2) the unit is used in parallel redundant configurations while
a) the output is less than 10% of nominal or b) the output is
within 10% to 100% of nominal and the unit is functioning

KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]

http://www.kepcopower.com  email: [e-mail]

©2013, KEPCO, INC 1
Data subject to change without notice 228-1563 REV 10

as a master. In parallel redundant configurations, the mod­ule with the highest voltage functions as the master. The
other units are slaves, and track the output voltage of the
master. Refer to Current Share Bus (CSB) on page 4 for
details. The front panel Vadj trimmer provides adjustment of
the output voltage within the limits specified in Table 1; test
points connected to the +S and –S lines are available at the
front panel for measuring the output.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, HSF-1UR 50W SERIES

(5)

(4)

(7)

HSF 3.3-10-1UR

(1) (2)

3.3V 5V 12V 15V 24V 28V 48V

10A 10A 4.3A 3.5A

10.5A min 10.5A min 4.5A min 3.68A min

33W 50W 51.6W 52.5W 52.8W 50.4W 52.8W

15A (15.5

120 120 150 150 150 200 300

3.9 - 5.1V 5.7 - 6.4V 13.5 - 15.5V 16.8 - 18.8V 26.8 - 30.3V 32.0 - 35.0V 54.8 - 59.9V

0.01 Ohm 0.01 Ohm 0.02 Ohm 0.03 Ohm 0.05 Ohm 0.05 Ohm 0.1 Ohm

HSF MODEL

OUTPUT VOLTS, d-c

(NOMINAL)

ADJUSTMENT RANGE 2.8 - 3.4V 4.3 - 5.3V 11.4 - 12.6V 13.5 - 16.5V 22.5 - 25.5V 22.4 - 30.2V 45 - 51

OUTPUT CURRENT

(NOMINAL)

CURRENT LIMIT

OUTPUT POWER (MAX.)

SHORT CIRCUIT CURRENT

RIPPLE

AND

NOISE

(mV p-p)

0-40°C,

10-100% LOAD

OVERVOLTAGE SETTING

(25°C, NOM. INPUT)

Sense Resistor (Rs) Value

(3)

(4)

switching (typ) 80 80 100 100 100 150 200

spike noise

(d-c—50MHz)

(1) Unless otherwise noted, specifications are identical for all options.
(2) Forced current Share not available for 3.3V Models.
(3) Derates same as Output Power.
(4) Current Limit is rectangular. After the overload is removed, output is

automatically restored.

(5) See power derating curve, Figure 5.

HSF 5-10-1UR

(1)

(9)

) 12.6A 5.6A 5.4A (4.5

HSF 12-4.3-1UR

(1)

HSF 15-3.5-1UR

(7) Sense resistor included on C and Y Models only (see

(8) Peak current and thermal protection applicable to 24V

(9) T, X and Y Models only.

(1)

HSF 24-2.2-1UR

(3.2A Peak

3.3A (2.3A

(9)

)3A

(1)(8)

2.2A

min

(9)

(8)

)

(9)

)

HSF 28-1.8-1UR

(6)

1.8A 1.1A

1.9A min 1.15A min

2.5A 2.4A (1.7A

“Remote on-off.” on page 3 for Y option details).

standard (no options) and C option models only. See Figure 1
for peak power requirements.

(6) 28V Model available with T, C, X and Y Options only.

HSF 48-1-1UR

(1)

(9)

)

I

1

I

2

t

3043527

T

D=(t/T)

Standard (no options) and C option 24V Models can sup­ply Peak current listed in Table 1 if the four conditions
listed below are met. This model includes thermal protec­tion, voltage shutdown type. Restart by removing a-c
input; after sufficient cooling, reapply a-c input (wait at
least 30 seconds).

1. Time: t ≤ 10 Seconds

2. I

≤ Peak Current (Amperes)

1

3. Effective Current:

2

DI

≤ Rated current (Amperes)

1

ID–()I

2

×+

2

4. Effective Power P ≤ Maximum Power (Watts)
(output RMS current x output voltage)

BUILT-IN OR-ING DIODES. OR-ing diodes allow configuration of all models for hot-swap and parallel­redundant N+1 operation where current distribution is not equal and the idle unit takes over in the event of failure.

FORCED CURRENT SHARE CIRCUIT. (Not appli­cable to 3.3V models.) When units are configured for N+1 parallel redundant operation, it is desirable for current to be divided equally among the paralleled supplies. When the CSB (forced Current Share Bus) lines of paralleled HSF-1UR units are connected together, the load current is forced to divide equally between all paralleled units; units operate at less than maximum, reducing stress and increasing reliability of the system. If one unit fails, the remaining units will continue to supply the load, and the load current will be divided equally among the remaining operating units. The failed unit is automatically isolated from the circuit by a built-in isolation diode. Refer to Cur-

rent Share Bus (CSB) on page 4 for details.

FIGURE 1. 24V MODEL PEAK CURRENT REQUIREMENTS

KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]

http://www.kepcopower.com  email: [e-mail]

2 228-1563 REV 10 083013

PS2PS1

3042496

FIGURE 2. HSF-1UR 50 WATT POWER SUPPLIES (4) INSTALLED IN RA 19-1U RACK ADAPTER

REMOTE ON-OFF. Remote on-off (X and Y models only) is via ±RC assigned to pins of the RA 19-1U I/O con­nector: off = no voltage, short circuit, or 0 to 0.8V, on = 4.5 to 12.5V (or 12.5 to 24.5V via 1.5K Ohms). To reverse on­off polarity contact Kepco. There is no isolation between ±RC, d-c output and alarm circuit. Refer to the RA 19-1U Manual for details. NOTE: POWER switch must be ON for remote control to be active.

CURRENT MONITOR. Current monitor (C and Y mod­els only) is via ±IMON assigned to pins of the RA 19-(X)B I/O connector. Monitored Output Current (Amps) = Voltage drop across R sum of R

S

(mVolts) / REQ (mOhms) where REQ is the

EQ

(see Table 1) + trace resistance to point where
current monitor is connected, approximately 4mOhms. The
voltage drop across R

is measured across ± IMON pins

EQ

(requires millivoltmeter, range 0 to 250mV). Accuracy is
±10%; contact Kepco if greater accuracy is required. There
is no isolation between ±IMON, alarm circuit and d-c out­put. Refer to the applicable RA 19-1U Manual for details.

PS3

PS4

ALARM CIRCUIT. The HSF-1UR includes an isolated internal relay offering normally closed and normally open contacts referenced to an isolated common (see above for isolation restrictions for remote on-off or current monitor options. These contacts may be used to configure “close on failure” or “open on failure” alarm circuits (“close on fail­ure” not available for X and Y models). (Refer to the RA 19-1U Manual for alarm configurations for multiple HSF-1UR power supplies.)

KEYING. Keying of the HSF-1UR is established at the factory (see Figure 3). The output voltage determines which key pins are installed. When the proper holes in the rack adapter are blocked by keying screws installed by the

FIGURE 3. REAR CONNECTOR AND KEYING

user, only a power supply of the correct voltage can be
inserted in the rack adapter slot. (Refer to the RA 19-1U
Manual for rack adapter keying instructions.)

KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]

083013 228-1563 REV 10 3

http://www.kepcopower.com  email: [e-mail]