KEPCO HSF 100W User Manual

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

HSF

KEPCO SINGLE OUTPUT 100 WATT

100W

HOT SWAP PLUG-IN POWER SUPPLIES

I — INTRODUCTION

The Kepco HSF 100 Watt series hot swappable, high frequency switching, plug-in power supplies employ forward conversion
and are designed to operate in a fault tolerant power system with either a-c or d-c input. A resistor and thyristor soft-start circuit
limits start-up surge. A built-in forced current share circuit and OR-ing diodes allow configuration for hot-swap and parallel­redundant N+1 operation.

These power supplies are designed to be used with Kepco’s Series RA 19-(X)B rack adapters (Figure 1). The RA 19-8B rack
adapter accepts up to eight 50 Watt or 100 Watt units (see Figure 1); RA 19-7B accepts up to four 50 Watt or 100 Watt units and
three 150 Watt units; RA 19-6B accepts up to six 150 Watt units. 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. Surface mount technology permits
efficient component layout for minimum mounting space.

Six models may be selected for outputs of 5, 12, 15, 24, 28, or 48V (see Table 1).

When the input is cut off, the output is maintained for 15 milliseconds minimum. If the power supply shuts down due to an output
overvoltage condition, it is then necessary to wait 90 seconds minimum (120V a-c input) or 120 seconds minimum (240V a-c
input) before turning the unit on again. EMI filtering is designed to meet FCC Class B rating and VDE 0871 Class B rating. This
page contains specifications for each model of the HSF 100 Watt Series. Environmental specifications for each model are the
same.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, HSF 100W SERIES

MODEL HSF 5-20 HSF 12-8.3 HSF 15-6.6 HSF 24-4.2 HSF28-3.5 HSF 48-2

OUTPUT VOLTS, d-c (NOMINAL) 5V 12V 15V 24V 28V 48V

ADJUSTMENT RANGE 4.5 - 5.5V 11.4 - 12.6V 13.5 - 16.5V 22.5 - 25.5V 26.5 - 29.5V 45.0 - 51.0

OUTPUT CURRENT (NOMINAL)

OUTPUT POWER (NOMINAL)

RIPPLE

AND

NOISE

(mV p-p)

0-40°C

10-100% LOAD

OVERVOLTAGE SETTING (25 °C, NOM. INPUT)

OVERCURRENT SETTING (25°C, NOM. INPUT)

Rectangular type characteristic

(1) Derates same as Ouptut Power.
(2) See power derating curve, Figure 4.

source (typ)101515202020

source (max) 15 30 40 40 40 40

switching (typ)303540506080

switching (max) 65 70 80 110 140 220

spike noise (d-c—50MHz) <120 <190 <220 <310 <330 <530

(1)

(2)

20A 8.3A 6.6A 4.2A 3.5A 2.0A

100W 99.6W 99W 100.8W 98W 96W

6.5 - 7.5V 13.7 - 15.7V 17.0 - 19.0V 27.0 - 30.5V 32.0 - 35.0 53.5 - 60.0

21.0 - 24.0A 8.7 - 10.0A 7.0 - 8.0A 4.4 - 5.2A 3.7 - 4.2A 2.1 - 2.4A

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 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 3 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.

FORCED CURRENT SHARE CIRCUIT. 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 (Current Share Bus) lines of paralleled HSF units are
connected together, the load current is forced to divide equally between all paralleled units. 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 Current Share Bus (CSB) on page 3 for details.

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] " FAX [phone]

©2006, KEPCO, INC 1
Data subject to change without notice 228-1300 REV 5

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

ALARM CIRCUIT. The HSF includes an isolated internal relay offering normally closed and normally open contacts refer­enced to an isolated common. These contacts may be used to configure “close on failure” or “open on failure” alarm circuits.
(Refer to the Series RA 19-(X)B Manual for alarm configurations for multiple HSF power supplies.)

KEYING. Keying of the HSF is established at the factory. The output voltage determines which keyway is open. When the
corresponding rack adapter key (pin) is installed by the user, only a power supply of the correct voltage can be inserted in the
rack adapter slot.

FIGURE 1. HSF 100 WATT POWER SUPPLIES (8) INSTALLED IN RA 19-8B RACK ADAPTER

III — SPECIFICATIONS

The following specifications apply to all HSF 100 Watt Series models (also refer to Table 1). Other models are also available;
consult your Kepco representative for their specifications.

INPUT:

Voltage: 120V a-c/240V a-c nominal; Range 95-264V a-c; 125-370V d-c. (polarity insensitive)
Frequency: Nominal 50-60 Hz; Range 47-440Hz (at 440Hz leakage current exceeds UL/VDE safety spec.limit).
Current (nominal output at rated load): @120V a-c rms: 2.0A a-c typ., 2.4A a-c max;

@240V a-c rms: 1.0A a-c typ., 1.6A a-c max.

Initial Turn-on Surge: (one-half of first input cycle): @120V a-c rms, 25A max; @240V a-c rms, 50A max. When the a-c

input power is removed, the inrush current limit circuit requires 30 seconds recovery time before the a-c input power

is reconnected.
Brownout Voltage: 85V a-c, 110V d-c.
Switching Frequency: 150KHz typical, nominal load.

STABILIZATION:

Source Effect: Range 95-132V a-c or 190-264V a-c, 1.0% typ.; 2.0% max.
Load Effect: Range 10%-100% load, 1.0% typ.; 2.0% max.
Temperature Effect: Range 0
Combined Effect: 2.0% typ.; 4.0% max. (includes source, load, and temperature effects).
Time Effect: 0.1% typ.; 0.5% max. (1/2 hr-8 hr at 25

RECOVERY CHARACTERISTICS: A step load change from 50% to 100% produces less than +
Recovery occurs to within +

o

to 40oC, 1.0% typ.; 2.0% max.

o

C).

4% output excursion.

1% of the original setting in <1 ms ( load change tr or tf equal to or greater than 50µsec).

START-UP TIME: 200 ms. maximum.

HOLDUP TIME: 20 ms. typ. (120V a-c), 15 ms. min. (100V a-c).

DIELECTRIC STRENGTH:

Between input and output: 2KV a-c for one minute.
Between input and output with Y-capacitor removed: 3KV a-c for one minute.
Between input and case (ground): 2KV a-c for one minute.

INSULATION RESISTANCE: Between input and ground, output and ground, input and output;

100 Megohms min. (500V d-c).

LEAKAGE CURRENT

(UL method, 120V a-c): 0.5 mA maximum.
(VDE method, 240V a-c): 0.75 mA maximum.

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] " FAX [phone]

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

2 228-1300 REV 5 082306

SAFETY: Units designed to meet UL60950 3rd Edition, CSA 22.2 No. 60950 and EN 60950 and are CE marked per the Low
Voltage Directive (LVD), 73/23/EEC and 93/68/EEC. [The standards do not apply with DC input operation.]

I/O CONNECTOR: The 24-pin I/O connector (Figure 2) is designed to mate with the corresponding connector in the Series
RA 19-(X)B Rack Adapter.

# (+) SENSE, (–) SENSE: These lines are provided to compensate for voltage drops in the load connecting wires. The

Sense lines must be connected to their respective (+) and (–) output terminals, either at the load or at the rack adapter
(see Rack Adapter Manual). The connection ensures the most accurate error tracking. Error compensation in the connect­ing wires is up to 0.25 Volts per lead for all models.

NOTE:

The Sense lines must be connected for the HSF Power supply to work properly!

# OUTPUT (+), OUTPUT (–): HSF power supply d-c output.

# CURRENT SHARE BUS (CSB): Connecting the CSB lines of HSF power supplies operating in a parallel configuration

causes output current to be shared equally. (See Rack Adapter Manual for additional information on parallel configura­tions.). For current sharing to work properly the outputs of all paralleled units must be within 250 mV (max) of each other
and each unit must be operating at between 10% to 100% of rated output. If current to the load goes below 10% for each
unit in current share mode, all MASTER ON lights may go on (see load effect specifications); this indicates that forced cur­rent share is no longer working, units are simply in current share mode. (If forced current sharing at less than 10% nominal
current per supply is needed, contact Kepco application engineering.) Remote sensing is recommended. For master/slave
operation to work properly each unit should be adjusted to 40 mV (optimum) less than the next paralleled unit (unit 1 is
adjusted to VOUT, unit 2 to VOUT – 40mV, and unit 3 to VOUT – 80mV, etc. If the master fails, the unit 2 will become the
new master). The 40 mV difference can be reduced to a minimum of 25 mV as needed to parallel many units and still keep
all units within 250 mV of each other. Adjust the outputs using Vadj trimmer on front panel.

• Optimum difference among output voltages of paralleled units: 40mV

• Maximum difference among output voltages of paralleled units: 250 mV

• Minimum difference among output voltages of paralleled units: 25 mV

# ALARM: The Alarm NC (normally closed) - Open on Failure and Alarm NO (normally open) - Close on Failure lines are

relay contacts referenced to Alarm Common. If the unit fails, the path between Alarm NC - Open on Failure and Alarm
Common opens, the path between Alarm NO - Close on Fail and Alarm Common is a short circuit. Figure 3 illustrates typ­ical Close on Fail and Open on Fail circuits to give a failure indication if any one of a number of power supplies fail.

# INPUT POWER: Line (either a-c or d-c source power), Neutral and Ground (chassis)

FIGURE 2. REAR CONNECTOR PIN ASSIGNMENTS

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] " FAX [phone]

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

082306 228-1300 REV 5 3

FIGURE 3. TYPICAL ALARM CIRCUIT DIAGRAMS

EMI: Designed to meet FCC Class B (100-120V a-c) and VDE 0871

Class B (220-240V a-c).

VIBRATION: (non-operating, one hour on each one of the three

axes):
5-10 Hz, 10 mm amplitude.
10-55 Hz, 2g acceleration.

SHOCK: (non-operating, one-half sinusoidal pulse, three shocks to

each axis):
Acceleration: 20g
Duration: 11ms +

5ms

OPERATING TEMPERATURE: See Figure 4.

STORAGE TEMPERATURE: -40

OPERATING AND STORAGE RELATIVE HUMIDITY: up to 95%

(wet bulb temp. <35

o

C non-condensing).

o

C to +75oC.

FUSE: Time Delay, 5.0A, 250V; (0.25 x 1.25 in), Nagasawa, P/N
SM5A; Kepco P/N 541-0114.

WARRANTY: 5 years.

FIGURE 4. % OUTPUT POWER RATING VS. AMBIENT

TEMPERATURE

FIGURE 5. HSF POWER SUPPLY OUTLINE DRAWING

KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL [phone] " FAX [phone]

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

4 228-1300 REV 5 082306