KEPCO HSP Series Operator's Manual

KEPCO®

THE POWER SUPPLIER™

OPERATOR’S MANUAL

HSP SERIES

1000 AND 1500 WATT SWITCHING POWER SUPPLY

VOLTAGE/CURRENT STABILIZED DC SOURCE

KEPCO INC.

An ISO 9001 Company.

HSP SERIES

POWER SUPPLY

ORDER NO. REV. NO.

IMPORTANT NOTES:

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

2) A Change Page may be included at the end of the manual. All applicable changes and

revision number changes are documented with reference to the equipment serial 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, (718) 461-700 0, requestin g the correct revision for your par ­ticular model and serial number.

3) The contents of this manual are protected by copyright. Reprodu ction of any part can be

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

Data subject to change without notice.

MODEL

©2015, KEPCO, INC
P/N 243-0851-h

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

SECTION PAGE

SECTION 1 - INTRODUCTION

1.1 Scope of Manual ................................. ... .................................................. ............................................... 1-1

1.2 General Description......................................................... ........................................................................ 1-1

1.3 Specifications..... ............................................... ... ... ............................................... ... .............................. 1-1

1.4 Miscellaneous Features .......................................................................................................................... 1-5

1.4.1 Control/Programming........................................................................................ ................................. 1-5

1.4.2 Status Indicators/Flags................................ ... ... .................................................. .............................. 1-5

1.4.3 Setpoint Monitors:............................................................................... ............................................... 1-5

1.4.4 Remote Error Sensing:...................................................................................................................... 1-5

1.4.5 Load Sharing: .................................................................................................................................... 1-5

1.4.6 Load Monitor:............................................................. ... ... .................................................................. 1-6

1.4.7 Auxiliary Supply:................................................................................................................................ 1-6

1.4.8 Overcurrent/Undervoltage Protection:............................................................................................... 1-6

1.4.9 Current Walk-in:................................................................................................................................. 1-6

1.4.10 Remote Reset:................................................................................................................................... 1-6

1.5 Options.................... ... ................................................ ............................................................................. 1-6

1.5.1 Meters (M Suffix): ...................................................................................................... ........................ 1-6

1.5.2 Battery Chargers (B Suffix):............................................................................................................... 1-6

1.5.3 Internal Blocking Diode (R Suffix):..................................................................................................... 1-6

1.6 Accessories................................................................ .. ........................................................................... 1-6

SECTION 2 - INSTALLATION

2.1 Unpacking and Inspection................................................................... .................................................... 2-1

2.2 Terminations and Controls .................................................... .................................................................. 2-1

2.3 Source Power Requirements .................................................................................................................. 2-3

2.4 Cooling ............................................. ... ................................................ .................................................... 2-3

2.5 Preliminary Operational Check................................................................................................................ 2-3

2.6 Installation .............................................. ... ... ............................................... ... ......................................... 2-4

2.7 Wiring Instructions................................................................................................................................... 2-4

2.7.1 Safety Grounding............................................................................................................................... 2-4

2.7.2 Source Power Connections............................................................................................................... 2-5

2.7.3 D-C Output Grounding................................................................ ..................................... .................. 2-5

2.7.4 Power Supply/Load Interface............................................................................................................. 2-6

2.7.5 Load Connection - General................................... ............................................................................. 2-6

2.7.5.1 Load Connection - Method I (Local Error Sensing)...................................................................... 2-7

2.7.5.2 Load Connection - Method II (Remote Error Sensing)................................................................. 2-8

2.7.5.3 Load Connection - Method III (Series Connection)...................................................................... 2-9

2.7.5.4 Load Connection - Method IV (Parallel Operation)...................................................................... 2-10

2.7.5.4.1 Redundancy and Hot Swap Applications................................................................................2-10

2.7.6 Load Sharing ........................................................ .. ... ........................................................................ 2-11

2.7.7 Signal Connections............................................................................................................................ 2-12

2.8 Mechanical Keying............................................................................................... ................................... 2-12

2.9 Retaining Latches....................................................... .. ... ........................................................................ 2-12

SECTION 3 - OPERATING INSTRUCTIONS

3.1 Operating Configuration.......................................... ... .. ........................................................................... 3-1

3.2 Remote Error Sense................................................................................................................................ 3-1

3.3 Output Voltage Programming.................................................................................................................. 3-1

3.4 Output Voltage Range............................................................................................................................. 3-2

3.5 Current Limit Programming ..................................................................................................................... 3-2

3.6 Current Limit Programming Range.......................................................................................................... 3-3

3.7 Setpoint Monitors ................................ .................................................................................................... 3-3

3.8 Overvoltage Protection Adjustment......................................................................................................... 3-4

3.9 Current Limit Characteristic..................................................................................................................... 3-5

3.10 Current Walk-in Circuit ................................................. ... ... ..................................................................... 3-6

3.11 5VAUX Floating Supply................................................................................................ ... ........................ 3-6

3.12 Remote Inhibit/Remote Reset Controls................................................................................................... 3-7

HSP OPR 081915 i/(ii Blank)

TABLE OF CONTENTS

SECTION PAGE

3.13 Module Current Monitor......................................................... .................................................................. 3-7

3.14 Status Indicators and Status Flags.......................................................................................................... 3-8

3.14.1 Power Indicator/Source Power Status Flags.................................... ................................................. 3-9

3.14.2 DCFAIL Indicator and Output Status Flags ....................................................................................... 3-10

3.14.3 OVERTEMP Indicator and Status Flags............................................................................................ 3-10

3.14.4 FANFAIL Indicator and Status Flags................................................................................................. 3-10

3.15 Front Panel Meter (M Option) Operation................................................................................................. 3-10

3.15.1 Voltmeter Operation.......................... ................................................................................................. 3-11

3.15.2 Ammeter Operation ...................................................... ... ... ............................................................... 3-11

3.15.3 Parallel/redundant Operation............................................................................................................. 3-11

3.16 Battery (B Option) Operation................................................................................................................... 3-12

LIST OF FIGURES

FIGURE PAGE

1-1 HSP Series Power Supply ............................................................................................................................ iv

1-2 HSP (All), Nominal Mains Voltage: Temperature Derating,........................................................................ 1-3

1-3 HSP 1500W, Low Mains Voltage: Temperature, Power Derating............................................................... 1-3

1-4 Outline Drawing ................................. .................................................. ....................................................... 1-4

2-1 HSP Series Front Panel Controls and Indicators........................................................................................ 2-1

2-2 Configuration Switch Functions .................................................................................................................. 2-1

2-3 HSP Series Rear Panel Connections ......................................................................................................... 2-2

2-4 Load Connection - Method I (Local Error Sensing)..................................................................................... 2-7

2-5 Load Connection - Method II (Remote Error Sensing)........................................................ ... ... .................. 2-8

2-6 Load Connection - Method III - (Series Connection)................................................................................... 2-9

2-7 Load Connection - Method IV (Parallel/Redundant Oper ation with Hot-Swap) .......................................... 2-10

3-1 External Resistance Programming of Output Voltage................................ ................................................. 3-2

3-2 External Voltage Programming of Output Voltage......................... ................................................... .......... 3-2

3-3 External Voltage Programming of Current Limit.......................................................................................... 3-3

3-4 Current Walk-in Characteristic......................... .. ... ................................................... .. ................................. 3-6

3-5 Remote Inhibit Control Operation ............................................................................................................... 3-7

3-6 Timing Diagram for POWER and DCFAIL Status.................................................................................

3-7 HSP M (Meter) Option and B (Battery Charger) Option, Front Panel.................................... ..................... 3-12

...... 3-9

TABLE PAGE

1-1 Model Parameters .......................................................................................................................................1-1

1-2 General Specifications ........................... .....................................................................................................1-2

1-3 Accessories ..................................................... ............................................... ... ..........................................1-7

2-1 Configuration Controls ................................................................................................. ...............................2-1

2-1 I/O Connector Pin Assignments ..................................................................................................................2-2

3-1 Status Indicators and Flags ........................................................................................................................3-8

3-2 Fault Detector Operation .............................................................................................................................3-10

3-3 B Option Fault Detection Window ...............................................................................................................3-12

HSP OPR 081915 iii

LIST OF TABLES

iv HSPSERIES 081915

FIGURE 1-1. HSP SERIES POWER SUPPLY

SECTION 1 - INTRODUCTION

1000 Watts

1500 Watts

FIGURE 0-1.

1.1 SCOPE OF MANUAL

This manual contains instructions for the installation and operation of the HSP series of voltage
and current stabilized d-c power supplies manufactured by Kepco, Inc., Flushing, New York, U.S.A.

1.2 GENERAL DESCRIPTION

The HSP power supply (Figure 1-1) is basically a voltage and current stabilized d-c source with
a relatively sharp crossover between voltag e and current mode operation. This permits HSPs to
be used both as conventional regulated voltage sources and in applications such as battery
chargers, where automatic crossover between constant voltage and constant current operation
is required.

HSP power supplies are supplied in a single mechanical size and are nom inally rated at eithe r
1000 or 1500 watts of output power. HSP 1000 watt power supplies are designed to operate
over the universal a-c power mains voltage range of 90-277V (47-63Hz), with operation from
125-420V d-c also available. HSP 1500 watt products provide full power over the a-c mains
range of range of 180-277V a-c, and 1000W output power from 90-132V a-c; contact Kepco for
information on operation over other source voltage ranges. Active power factor correction cir­cuitry limits source current harmonics to negligible levels, significantly improving source power
utilization. Cooling is provided via an internal d-c fan.

The HSP permits adjustment of both output voltage (V
nal (front panel pot) or external (resistance or voltage) methods; programming method is
selected via DIP switches accessed through the top of the unit. Independent circuitry provides
protection against overvoltage, overcurrent and overtemperature failures; fault detection cir­cuitry monitors performance of the output and critical internal functions, providing both visual
and electrical indicators. A switch-selectable “current walk-in” circuit and optional float/equalize
functions enhance the performance of HSP power supplies for such applications as battery
chargers.

The HSP power supply is specifically designed for both fix ed installation operation and, when
used in conjunction with Kepco RA 60 or similar plug-in rack adapters, as a hot replaceable
module in a redundant power system. Forced current sharing and optional internal or external
output blocking diodes enhance power system reliability. Mechanical keying eliminates the risk
of incorrect module insertion. Tool-operated latches on the front panel provide positive security
against casual removal of an operating module.

) and current limit (I

O

), either by inter-

MAX

1.3 SPECIFICATIONS

Table 1-1 below indicates specifications for parameters tha t vary for dif ferent HSP models; Table
1-2 lists general specifications that apply to all HSP models.

TABLE 1-1. MODEL PARAMETERS

OUTPUT VOLTAGE

(Volts)

MODEL

HSP 3.3-230 3.3 0.7-3.6 4.29 230 173 105 20 30 100 71

HSP 5-200 5 1.0-5.5 6.5 200 150 95 20 30 100 72
HSP 12-84 12 2.4-13.2 15.6 84 63 40 20 40 120 73
HSP 15-66 15 3.0-16.5 19.5 66 49.5 31.4 20 40 150 76
HSP 24-42 24 4.8-26.4 31.2 42 31.5 20 20 60 240 77
HSP 28-36 28 5.6-30.8 36.4 36 27 17 20 60 280 78
HSP 48-21 48 9.6-59.2 62.4 21 16 10 20 60 480 80
HSP 24-60 24 4.8-26.4 31.2 60 45 28.6 20 60 120 77
HSP 28-53 28 5.6-30.8 36.4 53 39.8 25.2 20 60 140 78

HSP 48-30 48 9.6-59.2 62.4 30 22.5 14.3 20 60 240 80

1. “R” Model efficiency is typically 2-3% lower.

HSPSERIES OPR 081915 1-1

Nominal
(Factory

Set)

Adjustment

Range

OVP

SETTING

(Volts)

Factory

Setpoint

OUTPUT CURRENT

(Amps)

50° C 60° C 71° C

Source

max

RIPPLE

(mV p-p)

Switching

max

NOISE

(mV p-p)

(Spike)
20MHz

EFFICIENCY

(Percent)

(See Note 1.)

100% Load

115V a-c

TABLE 1-2. GENERAL SPECIFICATIONS

CHARACTERISTIC REQUIREMENT

SOURCE INPUT

AC: Single-Phase,

Source Voltage

Brownout Voltage

Source Frequency

Source Current

Power Factor

Inrush Current 75A Peak max

Efficiency See Table 1-1.

Withstand Voltage

(See Note 2)

Leakage Current

Safety

Agency

Approvals

Immunity

(See Note 3)

Emissions

Nominal: 100-250V rms 200-250V rms
Range: 90-277Vrms 180-277V rms

DC: 125-420V d-c (polarity insensitive)
(See Note 1.)

1000W:75 V a-c typ.
1500W:150 V a-c typ.

47-440 Hz (Frequencies in excess of 63Hz
will cause leakage current to exceed limits
specified below)

120V a-c 11A rms max

240V a-c

0.99 typical; 0.96 minimum for all source
conditions and loads from 25% to 100% of
rated load.

3000V rms Input to Output
1500V rms Input to Case

500V d-c Output to Case
<0.50mA @ 115V a-c, 47-63Hz
<1.0mA @ 230V a-c, 47-63Hz
UL Recognized (SELV)

CSA Certified (SELV)

Radiated RF (Ampl. Mod.) (ENV50140)
10V/m, 80-1000MHz

Radiated RF (Pulse Mod.) (ENV50204)
(Pulse) 10V/m, 900MHz

Magnetic Field (EN 61000-4-8)
30A/m, 50Hz

Electrostatic Discharge (EN 61000-4-2)
Contact: 4KV, Air: 8KV

Conducted RF (ENV50141)
10Vrms, 0.15-80MHz

Electrical Fast Transient (EN 61000-4-4)
2KV, Tr/Th = 8/20µs

Input Surge (EN 61000-4-5)
Comm. Mode: 2KV; Diff. Mode: 1KV

Conducted RF (CISPR 22)
Class A Limits, 0.15-30MHz

Current Harmonics (EN 61000-3-2)
0-2KHz, any source/load condition)

1000W 1500W

1000W: 5.5A rms max
1500W: 8.0A rms max

UL 60950 3rd Edition

CSA 22.2 No. 60950-00

CHARACTERISTIC REQUIREMENT

OUTPUT/LOAD

Nominal Voltage See Table 1-1.

Rated Current See Table 1-1.

Minimum Output

Current

Output Voltage

Range

Regulation Error

Ripple and Noise See Table 1-1.

Start-up Time 1 sec maximum at rated output current

Output

Hold-up

Time

Turn-on/Turn-off

Overshoot

Load Transient

Response

(25% load transient,

2A/µsec rise/fall time)

Output Polarity

Input Fusing Front Panel circuit breaker (2-line)

Low A-C Protection

Overvoltage

Protection

Overcurrent

Protection

Overtemperature

Protection

NOTES:1. Safety Agency approval not applicable for noted conditions.

o

C, 65% RH

2. 25

3. Per EN 50082-2, Acceptance Criteria A

4. Latched shutdown requires that source power be cycled for
restart (optional restart by cycling REMOTE ON/OFF control
signal); see Operating Instructions, PAR. 3.12.

2% of rated load (lower output conditions may
result in increased output ripple and increased
transient response recovery time).

See Table 1-1.

Source Effect

Load Effect

Temperature

Effect

Time Effect

(Drift)

Combined Effect 0.3%

21.5 msec transparent power loss (no
indication)

5 msec following power loss indication
>27 msec total time prior to loss of output

regulation

Within load transient response envelope

Maximum
excursion

Recovery time

All outputs are floating and can be referenced
as required by the user at up to

PROTECTION

HSP Power supplies will self-protect, no fixed
limit.

Latched shutdown if output voltage exceeds
user-selected limit (see Operating Instructions,
PAR. 3.8) (see Note 4).

Constant current limiting (optional undervol­tage-activated latched shutdown (see Operat­ing Instructions, P AR. 3.9) (see Note 4).

Thermostat shutdown with hysteretic recovery
and automatic restart.

0.1% over full source
voltage range

0.1% from 5% to 100% of
rated load

o

C, 0oC<TA<50oC

0.02%/

0.1%/24 hr period after 30
min. warm-up

3% of nominal output
voltage

sec return to within 1% of

100

set voltage

±500V d-c.

1-2 HSPSERIES OPR 081915

TABLE 1-2. GENERAL SPECIFICATIONS (Continued)

CHARACTERISTIC REQUIREMENT

SIGNAL AND CONTROL

Remote Error Sensing

Remote On/Off Control

Load Sharing

Load Monitor

Status Flags

(Form C dry relay contacts)

(see PAR. 3.14)

(See Notes 5 and 7.)

Status Indicators

(front Panel LEDs)

(See Note 5.)

Front Panel

Test Points

Front Panel Meter

Accuracy

(M Option only)

3.3V & 5V Models 0.25V per wire
All other Models 0.8V per wire

Isolated TTL-compatible signal; either logic
high or logic low will disable output.

Within 5% of load when connected via load
sharing wire (see PAR. 2.7.6).

0-5V analog signal proportional to output
load current; 5V at 100% of rated load.

POWER

OUTPUT

OVERTEMP

FAN FAIL

POWER

DCFAIL

OVERTEMP

FAN FAIL

Monitors output voltage and current limit set
points; allows each HSP Power Supply to
be set while operating in any configuration,
including redundant mode.

Voltmeter: ±1%
Ammeter: ±10% from 25 to 100% of rated
output current.

Indicates low source
voltage; signal
asserted a minimum of
5 msec prior to loss of
output voltage.

Indicates HSP Power
Supply in normal
operating mode.

Indicates HSP Power
Supply in overtemper­ature shutdown.

Indicates failure of
internal cooling fan.

Green; lit when source
voltage is above
minimum limit to
support output voltage.

Red; lit when output is
outside normal voltage
regulation limits

Yellow; lit when over­temperature protec­tion is activated.

Red; lit when fan
failure latch is
activated.

CHARACTERISTIC REQUIREMENT

SIGNAL AND CONTROL (CONTINUED)

Auxiliary Voltage

(Isolated)

Voltage Set

Programming

Mode selected by

internal switches

(See Note 6.)

(See PAR. 3.3.)

Current Limit

Programming

Temperature Range

Cooling

Humidity

Shock

Vibration

Altitude Sea level to 10,000 feet

Dimensions See Figure 1-4.

Weight 16 lbs. (7.3Kg)
Source

Connections

Load

Connection

Signal Connection 37-pin D-subminiature connector (male)

NOTES 5: Status indicators and status flags are isolated and operate

independently, although driven by the same detector circuit.

6: The POWER/DCFAIL fault detector window tracks pro-

grammed output voltage, however, the overvoltage protection
trip point remains unaffected.

7. Form C contacts: rated from 30V d-c/1A to 60V d-c/0.3A.

4.75-5.25V d-c output, 0 - 100mA, parallelable,
output isolated (500 V d-c), Input isolated
(SELV) (See Operating Instructions, PAR. 3.11).

Internal Mult iturn pot

External 1 Resistance: 0-50K

External 2 0-10V, 500

Internal Mult iturn pot

External 0-10V, 500

ENVIRONMENT

0 to 50° C: rated load (50° C to 71°

Operating

Storage –40 t o +85

Internal d-c fan (inlet, exhaust as indicated in
Figure 1-4).

0-95% RH (non-condensing), Operating and
Storage.

Non-operating, 20g, 11msec 50%, half sine,
3 axes, 3 shocks each axis

5-10Hz 10mm, double amplitude

10-55Hz 2g

3-pin power entry module (compatible with IEC
320/C19 molded line cord plug.

Two bus bars (+ and –) 1.0 x 0.12 5 inch , co pper
w/bright nickel finish

C: derate by 2.5%/° C, Figure 1-2)
For 1500W at lower mains voltage:
see Figure 1-3 and Note 1:

PHYSICAL

A max

A max

o

C

FIGURE 1-2. HSP (ALL), NOMINAL MAINS V OLTAGE:

TEMPERATURE DERATING,

HSPSERIES OPR 081915 1-3

FIGURE 1-3. HSP 1500W, LOW MAINS VOLTAGE:

T EMPERATURE, POWER DERATING

1-4 HSPSERIES OPR 081915

FIGURE 1-4. OUTLINE DRAWING

1.4 MISCELLANEOUS FEATURES

1.4.1 CONTROL/PROGRAMMING

a) VOLTAGE CHANNEL: Output voltage is controlled continuously throughout the specified

adjustment range via a 10-turn potentiometer mounted behind the front panel. External
control can be exercised either by resistance or by control voltage (see PAR’s. 3.3 and 3.4).

b) CURRENT CHANNEL: Output current is controlled continuously throughout the specified

adjustment range via a 10-turn potentiometer mounted behind the front panel. External
control can be exercised by control voltage (see PAR’s. 3.5 and 3.6).

c) OVERVOLTAGE LEVEL: The output voltage level at which the overvoltage protection

latch is activated may be adjusted locally via a 10-turn potentiometer accessed through the
top cover (see PAR. 3.8).

d) REMOTE INHIBIT: Operation of the output regulator can be inhibited remotely via either

one of two TTL-level control lines, RC1 and RC2. Both of these signals are isolated from
both the input and output, allowing single-point control of several power supplies operating
at different potentials. Both positive and negative logic are supported (see PAR. 3.12).

1.4.2 STATUS INDICATORS/FLAGS

a) STATUS INDICATORS: Four LED indicators at the front panel provide the following oper a-

tional information (see PAR. 3.14):

• POWER: Green; lit when source voltage is above minimum required to support rated
load.

• DCFAIL: Red; lit when output voltage is beyond regulation limits or when load current is
below minimum load sharing requirement.

• OVERTEMP: Amber; lit when internal overtemperature pr ot ection is activated.

• FANFAIL: Red; lit when internal cooling fan failure is detected.

b) ST ATUS FLAGS: Four sets of Form C dry relay contacts (3 wires each) are provided at the

I/O connector which duplicate the front panel status indicator functions (see PAR. 3.14).

1.4.3 SETPOINT MONITORS: Analog voltage signals which display progr amm ed outpu t voltage and
current limit values. These signals are available both at the front p anel test po ints (V

and I

O

MAX

and at the I/O connector (VSET and ISET). Signals are referenced to negative error sense (see
PAR. 3.7).

1.4.4 REMOTE ERROR SENSING: Separate voltage sensing connections permit 4-wire connection
to load. Will compensate for static load effects due to power lead d-c resistance (DCR) up to
specified maximum voltage drop per load lead at maximum specified output voltage (see PAR.

3.2).

1.4.5 LOAD SHARING: Bidirectional control port provides forced load sharing between two or more
HSP (or HSM) series power supplies wired in parallel (see PAR. 2.7.6).

)

1.4.6 LOAD MONITOR: Analog voltage signal which indicates actual load current delivered by the
HSP power supply (see PAR. 3.13).

HSPSERIES OPR 081915 1-5

1.4.7 AUXILIARY SUPPLY: Logic-level secondary output provides up to 0.5 watts of power at 5V
d-c. This output is isolated from the output and is unaffected by the status of the main output.
Provides power for external Remote Inhibit controls (see PAR. 3.11).

1.4.8 OVERCURRENT/UNDERVOLTAGE PROTECTION: Switch-selectable option provides the
user load protection again st long-term output overloads or undervoltage conditions (see PAR.

3.9).

1.4.9 CURRENT WALK-IN: Switch-selectable option provides control of output current rise rate
based on Bellcore TR-TSY-000947 requirements for battery chargers (see PAR. 3.10).

1.4.10 REMOTE RESET: Switch-selectable option provides capability to reset the latch used by the
overvoltage protection circuitry to disable the output regulator, using the Remote Inhibit control
lines (see PAR. 3.12).

1.5 OPTIONS

HSP options are described below; more than one option may be incorporated into any HSP
Power Supply.

1.5.1 METERS (M SUFFIX): HSP power supplies are available with an optional front panel meter
which displays output voltage and output current (switch selectable). Refer to PAR. 3.15 for
operation.

1.5.2 BATTERY CHARGERS (B SUFFIX): The battery charger option adds swit ch selectable “float ”
and “equalize” functions which provide two separate voltage regulation settings, as well as an
expanded window for the output voltage fault detecto r compatible with nor mal batt ery opera ting
voltages (Refer to PAR. 3.16 for operation).

1.5.3 INTERNAL BLOCKING DIODE (R SUFFIX): This option adds a blocking diode in series with
the output, required for “hot swap” applications.

1.6 ACCESSORIES

Accessories for HSP Power Supplies are listed in Table 1-3.

1-6 HSPSERIES OPR 081915

TABLE 1-3. ACCESSORIES

ACCESSORY PART NUMBER USE

RACK

ADAPTERS

RACK
ADAPTER
OPTIONS

SERIES

CLAMPING

DIODES

CONNECTORS

FIXED

INSTALLATION

KIT

SCREW 101-0159

CABLE

ASSEMBLIES

RA 58

RA 59

RA 60

RA 61

RA 62

RA 63

-23E

-24E

124-0600

124-0601

142-0422
142-0381
118-0776
108-0294
108-0203

219-0240

219-0249

118-0974

118-1133

118-1095

Provision for three HSP (or HSM) Power Supplies in a 19-inch rack. Used for hard-wired
applications only.

Same as RA 60 except accommodates up to four HSP Power Supplies in a 24-inch rack for
plug-in and hot swappable applications.

Plug-in rack adapter provides for three HSP Power Supplies in a 19-inch rack. Designed
specifically for hot-swap applications when used with R-suffix HSP models; the power out­puts of all three positions of this rack adapter are permanently bussed together in parallel.
Separate source power and I/O signal connections for each position.

Provision for four HSP (or HSM) Power Supplies in a 24-inch rack. Used for hard-wired appli­cations only.

Same as RA 60 except that two positions are bussed together in parallel while the remaining
position is left isolated for independent operation.

Same as RA 60 except that all three positions are isolated for independent operation.
Incorporates wider mounting ears to accommodate a 23-inch rack; available for all 19-inch

rack adapters above.
Incorporates wider mounting ears to accommodate a 24-inch rack; available for all 19-inch

rack adapters above.
Used with HSP 24V, 28V and 48V models when wired for series operation. User must pro-

vide wiring and heat sink. One diode required for each power supply. See PAR.2.7.5.3.
Used with HSP 3.3V, 5V, 12V and 15V models when wired for series operation. User must

provide wiring and heat sink. One diode required for each power supply. See PAR. 2.7.5.3.
I/O connector mating plug
Source power inlet connector mating plug (IEC 320-C19)
North American linecord set (NEMA 5-20P to IEC 320-C19)
I/O connector backshell
I/O connector jackposts (set of two)
Standard - Kit consists of North American linecord set, I/O connector mating plug, I/O con-

nector backshell, I/O connector jackposts, and plastic feet with screws.
Customer-wired - Same as Standard Kit (Part No. 219-240), except linecord is replaced with

user-wired AC power inlet mating plug.
Used to attach plastic feet to HSP Power Supply (#6-20, 0.625 in. long).
Mates with I/O connector. Provides connection between pins 19 (–error sense) and 37

(+error sense) to two wires terminated in ring lugs for ±error sense connections.
Simplifies I/O connections for two units in parallel. Provides connections between two I/O

connectors: pins 14 (current share), 19 (–error sense) and 37 (+error sense). Two wires ter­minated in ring lugs are provided or ±error sense connections.

Simplifies I/O connections for three units in parallel. Provides connections between three I/O
connectors: pins 14 (current share), 19 (–error sense) and 37 (+error sense). Two wires ter­minated in ring lugs are provided for ±error sense connections.

HSPSERIES OPR 081915 1-7/(1-8 Blank)

SECTION 2 - INSTALLATION

FIGURE 2-2. CONFIGURATION SWITCH FUNCTIONS

TABLE 2-1. CONFIGURATION CONTROLS

SW

POSITION

FUNCTION

REF

PAR.
S1-1 REMOTE LOCKOUT RESET 3.12
S1-2 CURRENT WALK-IN 3.10
S1-3 UNDERVOLTAGE LOCKOUT 3.9

S2-1 RANGE SELECT (VOLTAGE LOOP) 3.4
S2-2 RANGE SELECT (FAULT DETECTOR) 3.4
S2-3 EXT. VOLT. PROG. (VOLTAGE LOOP) 3.3
S2-4 EXT. RES. PROG. (VOLTAGE LOOP) 3.3
S2-5 INT. PROG. (VOLTAGE LOOP) 3.3

S3-1 RANGE SELECT (CURRENT LOOP) 3.6
S3-2 EXT. VOLT. PROG. (CURRENT LOOP) 3.5
S3-3 INT. PROG. (CURRENT LOOP) 3.5

2.1 UNPACKING AND INSPECTION

This instrument has been thoroughly inspected and tested prior to packing and is ready for
operation. After careful unpacking, inspect for shipping damage before attempting to operate.
Perform the preliminary operational check as outlined in PAR. 2.5. If any indication of damage is
found, file an immediate claim with the responsible transport service.

2.2 TERMINATIONS AND CONTROLS

a) Front Panel: Refer to Figure 2-1.
b) Configuration Controls: Refer to Figure 2-2 and Table 2-1.
c) Rear Panel: Refer to Figure 2-3 and Table 2-1.

FIGURE 2-1. HSP SERIES FRONT PANEL CONTROLS AND INDICATORS

HSPSERIES OPR 081915 2-1

FIGURE 2-3. HSP SERIES REAR PANEL CONNECTIONS

TABLE 2-1. I/O CONNECTOR PIN ASSIGNMENTS

PIN NO. NAME DESCRIPTION OF FUNCTION REF. PAR.

1 X NO CONNECTION
2 X NO CONNECTION
3 FFS-1 FAN STATUS - NORMALLY CLOSED CONTACT 3.14
4 ACS-C SOURCE POWER STATUS - COMMON CONTACT 3.14
5 ACS-2 SOURCE POWER STATUS - NORMALLY CLOSED CONTACT 3.14
6 X

7 RC2
8 RC1
9 X

NO CONNECTION
REMOTE INHIBIT - NORMALLY LOW INPUT
REMOTE INHIBIT - NORMALLY HIGH INPUT

NO CONNECTION
10 X NO CONNECTION
11 OTS-C OVERTEMP STATUS - COMMON CONTACT 3.14
12 PSS-C OUTPUT STATUS - COMMON CONTACT 3.14
13 PSS-2 OUTPUT STATUS - NORMALLY CLOSED CONTACT 3.14
14 ISHARE

15 IPROG

LOAD SHARE SIGNAL BUS (0-5.5V)

ANALOG PROGRAMMING INPUT - CURRENT (0-10V)
16 X NO CONNECTION
17 VRP-1 RESISTIVE PROGRAMMING INPUT (0-10K) 3.3
18 VPROG

ANALOG PROGRAMMING INPUT - VOLTAGE (0-10V)
19 -S NEGATIVE ERROR SENSE INPUT 2.7.5
20 X NO CONNECTION
21 FFS-2 FAN STATUS - NORMALLY OPEN CONTACT 3.14
22 FFS-C FAN STATUS - COMMON CONTACT 3.14
23 ACS-1 SOURCE POWER STATUS - NORMALLY OPEN CONTACT 3.14
24 X

25 AUXRTN

NO CONNECTION

AUXILIARY SUPPLY RETURN
26 5VAUX AUXILIARY SUPPLY OUTPUT 3.11
27 X

NO CONNECTION
28 X NO CONNECTION
29 OTS-2 OVERTEMP STATUS - NORMALLY OPEN CONTACT 3.14
30 OTS-1 OVERTEMP STATUS - NORMALLY CLOSED CONTACT 3.14
31 PSS-1 OUTPUT STATUS - NORMALLY OPEN CONTACT 3.14
32 IMON

33 ISET

ANALOG OUTPUT CURRENT MONITOR (0-5.5V)

CURRENT LIMIT SETPOINT MONITOR (0-10V)
34 X NO CONNECTION
35 VRP2 RESISTIVE PROGRAMMING INPUT - VOLTAGE (0-10K) 3.3
36 VSET

OUTPUT VOLTAGE SETPOINT MONITOR (0-10V)
37 +S POSITIVE ERROR SENSE INPUT 2.7.5

(1) These pins are left blank to provide voltage isolation between output
and a 5V aux supply which powers the remote inhibit control circuitry.
(2) These signals are referenced to auxrtn (pin 25).
(3) These signals are referenced to -s (pin 19).

(1)

(2)

(2)

(1)

(3)

(3)

(3)

(1)

(2)

(1)

(3)

(3)

(3)

3.12

3.12

2.7.6

3.5

3.3

3.11

3.13

3.7

3.7

2-2 HSPSERIES OPR 081915

2.3 SOURCE POWER REQUIREMENTS

This power supply will operate with the installed circuit breaker from single phase a-c mains
power over the specified voltage and frequency ranges without adjustment or modification.
Operation from d-c power is also available; please contact factory for limitations imposed when
using d-c source power.

2.4 COOLING

The power devices used within the HSP power supply are maintained within th eir operating tem­perature range by means of internal h eat sink assemblies cooled by an internal cooling fan. The
cooling method utilizes pressurization rather than evacuation, resulting in greater cooling effi­ciency and reduced contaminant collection within the enclosure. ALL INLET AND EXHAUST
OPENINGS AROUND THE POWER SUPPLY CASE MUST BE KEPT CLEAR OF OBSTRUC­TION TO ENSURE PROPER AIR ENTRY AND EXHAUST. Periodic cleaning of the power sup­ply interior is recommended. If the power supply is rack mounted, or installed within a confined
space, care must be taken that the ambient temperature, which is the temperature of the air
immediately surrounding the power supply, does not rise above the specified limits for the oper­ating load conditions (see PAR. 1.3 and Figure 1-2).

2.5 PRELIMINARY OPERATIONAL CHECK

A simple operational check after unpacking and before equipment installation is advisable to
ascertain whether the power supply has suffered damage res ulting from shippin g. Refer to Fig­ures 2-1, 2-2 and 2-3 for location of operating controls and electrical connections.

1. THE POWER SUPPLY WILL NOT OPERATE UNLESS THE REMOTE SENSE LINES ARE
PROPERLY CONNECTED TO THE OUTPUT TERMINALS! Connect the remote sense ter­minals to the output bus bars using the mating I/O Connector (Kepco P/N 142-0422) or other
means as shown in PAR. 2.7.5.1 and Figure 2-4.

2. Connect the power supply to source power as defined in PAR. 1.3. Connection can be made
using either the North American linecord set (Kepco P/N 118-0776) or using a custom line­cord terminated at one end with an IEC 320/C19 plug (Kepco P/N 142-0381). Follow all
requirements of local electric code regarding wire size, termination, etc.

3. Connect a static load, R, across output terminals. The load value is determined by the nomi­nal output voltage of the HSP power supply and must be capable of handling 2% of the
power supply output rating (minimum power capability of 20 watts). R is calculated as
approximately equal to output voltage

2

48

/20 = 115.2; use load of 120 ohms, 20 watts.

2

/20 (R = E2/P). For example, for the HSP 48-21, R =

CAUTION: DO NOT repeatedly toggle the circuit breaker/switch as this may damage the

unit.

4. Set Power ON/OFF circuit breaker/switch on front panel to ON. If actuator does not lock
when released, wait a few seconds before trying again. The circuit breaker is “trip-free”
design; if overload exists, contacts cannot be held closed by actuator. Verify that the
“POWER” indicator LED on the front p anel is lit, and that all other indicator lamps on the front
panel are not lit.

5. Using a DVM, measure the voltage across the output bus bars; this voltage is factory set to
the value shown in Table 1-1. If necessary, adjust the output voltage using the trim pot
labeled “V

” accessed through the front panel.

O

6. Using the DVM, measure the voltage across the front panel test points “V
voltage should read

HSPSERIES OPR 081915 2-3

1

/10 of the output voltage measured in step 5 above, ±1%.

O

” and “COM”; this

7. Using the DVM, measure the voltage across the front panel test points “I

WARNING

this voltage is factory adjusted to 10.0V, and corresponds to 100% of maximum current (see
P AR. 3.7). If necessary, readjust to 10.0V using the trim pot labeled “I
the front panel; if desired, readjust for lower current limit (see PAR. 3.7).

8. Verify that front panel indicators still appear as in step 4 above.

9. Disconnect sense lines with power supply still operating, either by removing the mating I/O
connector or by manually opening th e sense line connected to Pin 37; verify that the powe r
supply output turns off, and that the “DCFAIL” indicator LED on the front panel is now lit,
along with the “POWER” indicator LED. (NOTE: At no load the output voltage will drop
slowly.) Turn the front panel circuit breaker off and wait until the “DCFAIL” indicator LED
blinks. Reconnect the sense lines, then turn the circuit breaker back on; verify that the output
voltage returns to the value measured in step 5 above, and that the indicator LEDs appear
as in step 4 above.

10.Turn off front panel circuit breaker and remove source power connection.

2.6 INSTALLATION (REFER TO FIGURE 1-4, OUTLINE DRAWING)

The HSP power supply may be operated as a fixed rack-mounted unit, or as a plug-in modular
instrument as follows:

• When used as a fixed, rack-mounted unit, attach the HSP power supply to the m ounting
surface using the four holes in the bottom of the chassis surrounded by plastic grom­mets.

” and “COM”;

MAX

” accessed through

MAX

• When used as part of a plug-in power system, refer to the Instruction Manual accom­panying the applicable Kepco rack adapter for installation directions.

For all installations, provide adequate clearance around air inlet and exhaust locations and
ensure that the temperature immediately surrounding the unit and especially near the air inlets
does not exceed the maximum specified ambient temperature for the operating conditions.

2.7 WIRING INSTRU CTIO NS

Interconnections between an a-c power source and a stabilized power supply, and between the
power supply and its load are as critical as the interface between oth er types of electronic eq uip­ment. If optimum performance is expected, certain rules for the interconnection of source,
power supply and load must be o bserv ed by t he u ser. These rules are describ ed in detail in the
following paragraphs.

2.7.1 SAFETY GROUNDING

Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic par t of
the safety aspect of the instrum ent. The ground terminal of the source power connector (see
Figure 2-2) is connected to the HSP chassis and the instructions below suggest wiring methods
which comply with these safety requirements; however, it is the customer's responsibility to
ensure that all applicable electric codes for safety grounding requirements are met.

IT IS IMPERATIVE THAT THE USER PROVIDE ALL THREE SOURCE WIRE CONNEC­TIONS, AS THIS CONNECTION IS THE SAFETY GROUND PROVISION!

2-4 HSPSERIES OPR 081915

2.7.2 SOURCE POWER CONNECTIONS

The rear panel of the HSP power supply is equi p ped with an IEC 32 0 style rece ssed po we r inlet
connector which provides interface to a 3-wire safety line cord via a polarized mating plug.
Kepco offers as accessories (see Table 1-3) both a user-wired mating connector and a pre wired
linecord set, the latter configured for North American applications. Terminal assignment follows
internationally accepted conventions (see Figure 2-3). It is the user's responsibility to ensure
that all applicable local codes for source power wiring are met.

The user-wired mating connector requires size #14 AWG (minimum) conductors for all three
connections. When HSP power supplies are installed in a plug-in rack adapter (RA 60 or simi­lar), consult the rack adapter Instruction Manual for source connection information.

Depending on your application, source bran ch current rating may be significantly less than the
rating of the HSP circuit breaker, especially in configurations where HSP are used in parallel/
redundant applications. The HSP circuit breaker rating is based on worst-case operating condi­tions. However, since HSP power supplies are switch-mode power supplies, the source power
drain is constant and essentially independent of source voltage, regardless of load power
requirements. Therefore under n ormal, rather than wors t case, conditions, HSP dra w substan­tially less than the rated maximum input current, particularly at higher source voltages. Contact
Kepco Applications Engineering for additional information.

2.7.3 D-C OUTPUT GROUNDING

Connections between the power supply and the load and sensing connections may, despite all
precautions such as shielding, twisting of wire pairs, etc., be influenced by radiated noise, or
“pick-up”. To minimize the effects of this radiated noise the user should consid er grou nding on e
side of the power supply/load circuit. The success of d-c grounding requires careful analysis of
each specific application, however, and this recommend ation can only serve as a gener al guide­line.

One of the most important considerations in establishing a successful grounding scheme is to
avoid GROUND LOOPS. Ground loops are created when two or more points are grounded at
different physical locations along the output circuit. Due to the interconnection impedance
between the separated grounding points, a difference voltage and resultant current flow is
superimposed on the load. The effect of this ground loop can be anything from an undesirable
increase in output noise to disruption of power supply and/or load operation. The only way to
avoid ground loops is to ensure that the entire output/load circuit is fully isolated from ground,
and only then establish a single point along the output/load circuit as the single-wire ground
point.

The exact location of the “best” d-c ground point is entirely dependent upon the spe cific applica­tion, and its selection requires a combination of analysis, good judgement and some amount of
empirical testing. If there is a choice in selecting either the positive or negative output of the
power supply for the d-c grou nd point, both sides shou ld be tried, and preferen ce given to the
ground point producing the least noise. Fo r single, isolated loads the d-c ground point is often
best located directly at one of the output terminals of the power supply; whe n remote error sens­ing is employed, d-c ground may be established at the point of sense lead attachment. In the
specific case of an internally-grounded load, the d-c ground point is automatically e stablished at
the load.

The output terminals of HSP power supplies are d-c isolated (“floating”) from the chassis in
order to permit the user maximum flexibility in selecting the best single point ground location.
Output ripple specifications as measured at the output are equally valid for either side grou nded.

HSPSERIES OPR 081915 2-5

Care must be taken in measuring the ripple and noise at the power supply: measuring devices
which are a-c line operated can often introduce additional ripple and noise into the circuit.

There is, unfortunately, no “best” method for interconnecting the load and power supply. Individ­ual applications, location and nature of the load require careful analysis in each case. Ground­ing a single point in the output circuit can be of great importance. It is hoped that the preceding
paragraphs will be of some assistance in most cases. For help in special applications or difficult
problems, consult directly with Kepco's Application Engineering Department.

2.7.4 POWER SUPPLY/LOAD INTERFACE

The general function of a voltage- or current-stabilized power supply is to deliver the rated out­put quantities to the connected load. The load may have any conceivable characteristic: it may
be fixed or variable, it may have predominantly resistive, capacitive or inductive parameters; it
may be located very close to the power supply output terminals or it may be a considerable dis­tance away. The perfect interface between a power supply and its load would mean that the
specified performance at the output terminals would be transferred without impairment to any
load, regardless of electrical characteristics or proximity to each other.

The stabilized d-c power supply is definitely not an ideal voltage or current source, and practical
interfaces definitely fall short of the ideal. All voltage-stabilized power supplies have a finite
source impedance which increases with frequency, and all current-stabilized power supplies
have a finite shunt impedance which decreases with frequency. The method of interface
between the power supply output and the load must, therefore, take into account not only size
with regard to minimum voltage drop, but configur ation with r egar d to mini mizing the impe dan ce
introduced by practical interconnection techniques (wire, bus bars, etc.). The series inductance
of the load wire must be as small as possible as compared to the source inductance of the
power supply: error sensing cannot compensate for reactive effects due to this. These dynamic
conditions are especially important if the load is constantly modulated or step-programmed, or
has primarily reactive characteristics, or where the dynamic output response of the power sup­ply is critical to load performance.

2.7.5 LOAD CONNECTION - GENERAL

Load connections to the HSP powe r supply are achieved via the b us bars protruding from the
rear panel. The bus bars are each provided with two holes, one 0.34" diameter clearance hole

5

(for

/16" UNC threaded fastener) and one #10-32 threaded hole (see Figure 1-4). The threaded
hole is provided for attachment of error sensing leads from the signal connector when local
sense with benchtop opera tion is desired. Do not connect sense lines using these holes when
using the HSP Power Supply with plug-in rack adapters; instead connect ± sense lines to ± out­put studs on rack adapter, observing proper polarities: plus to plus, minus to minus.

Load cable or bus bar attachment should use the clearance hole, using a
and lockwasher. The u se of the proper fasten er size and inclusion of a lockwasher are critical to
maintaining intimate contact between the load conductor and output bus bar; Kepco recom­mends the use of fasteners made of conductive material (brass, phosphor bronze, etc.) to
enhance conductivity; for high current loads (>100A) Kepco recommends the use of Bellville­style constant tension washers in place of conventional lockwashers.

REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST
BE CONNECTED FOR OPERATION. OBSERVE POLARITIES: THE NEGATIVE
SENSING WIRE MUST BE CONNECTED TO THE NEGATIVE LOAD WIRE, AND
THE POSITIVE SENSING WIRE TO THE POSITIVE LOAD WIRE.

NOTE

5

/16" UNC nut, bolt

2-6 HSPSERIES OPR 081915

2.7.5.1 LOAD CONNECTION - METHOD I (LOCAL ERROR SENSING)

The most basic power supply/load interface is a 2-wire connection between the power supply
output terminals and the load. This connection method employs local error sensing which con­sists of connecting the error sense leads directly to the po wer supply's ou tput terminals. It s main
virtue is simplicity: since voltage regulation is maintained at the power supply output, the regula­tion loop is essentially unaffected by the impedances presented by the load interconnection
scheme. The main disadvantage is that it cannot compensate for losses introduced by the inter­connection scheme and, therefore, regulation degrades directly as a function of distance and
load current. The main applications for this method are for powering primarily resistive and rela­tively constant loads located close to the power supply, or for loads requiring stabilized current
exclusively. The load leads should be tightly twisted to reduce pick-up. See Figure 2-4.

FIGURE 2-4. LOAD CONNECTION - METHOD I (LOCAL ERROR SENSING)

HSPSERIES OPR 081915 2-7

2.7.5.2 LOAD CONNECTION - METHOD II (REMOTE ERROR SENSING)

If the load is located at a distance from the power supply terminals, or if reactive and/or modu­lated loads are present, remote erro r sensing should be used to minimi ze their ef fect on the vo lt­age stabilization. A twisted shielded pair of wires from the sensing terminals directly to the load
will compensate for voltage drops in the load interconnection scheme (see Specifications for
available headroom based on model); the termination point of the error sensing leads should b e
at or as close as practical to the load. For these conditions it is also recommended that some
amount of local decoupling capacitance be placed at the error sense termination point to mini­mize the risk of unwanted pick-up affecting the remote error sense function. See Figure 2-5.

FIGURE 2-5. LOAD CONNECTION - METHOD II (REMOTE ERROR SENSING)

2-8 HSPSERIES OPR 081915

2.7.5.3 LOAD CONNECTION - METHOD III (SERIES CONNECTION)

NOTES:

1. SEE TABLE 1-3 FOR CLAMPING
DIODE PART NUMBER.

2. FOR RACK ADAPTER CONNECTIONS,
CONNECT -S AND +S FROM I/O CON­NECTOR TO RACK ADAPTER -V AND
+V STUDS, RESPECTIVELY, AT EACH
POPULATED POSITION.

(SEE NOTE)

(SEE NOTE)

Units may be connected in series to obtain higher output voltages. Each power supply in the
series should be protected by a clamping diode connected in its non-conducting direction in par­allel with the output; this diode protects the power supply outputs against secondary effects in
the event of a load short. (Note that this is NOT the same as the blocking diode used for parallel/
redundant operation.) Selection of the clamping diode is entirely dependent upon output volt­age/current parameters. The clamping diode must be rated for the maximum voltage and cur­rent of the series connection. Several clamping diodes in parallel may be required to meet the
total current rating.

The user must also respect the ±500V d-c maximum isolation from output to chassis when
determining the maximum series voltage. Figure 2-6 shows a series connection of two HSP
power supplies.

HSPSERIES OPR 081915 2-9

FIGURE 2-6. LOAD CONNECTION - METHOD III - (SERIES CONNECTION)

2.7.5.4 LOAD CONNECTION - METHOD IV (PARALLEL OPERATION)

Identical HSP power supply models may be connected in parallel in order to provided increase d
output current to a common load (see Figure 2-7). This permits the user to obtain significantly
higher load ratings than for a single HSP power supply. The number of power supplies required
is determined by dividing the required load current by the current rating of the applicable HSP
model, and rounding up to the next whole number when necessary. HSP power supplies incor­porate fault detection circuitry which precludes the need for output blocking diodes, and utilize
active current sharing circuitry to distribute the load current equally among the paralleled units.
When operating HSP power supplies in any parallel configuration, load sharing must be imple­mented among the paralleled modules; this is required for proper operation of the fault detector
(see PAR. 2.7.6). Figure 2-7 shows a typical parallel configuration using two power su pplies;
additional parallel modules are added by scaling Figure 2-7.

.

FIGURE 2-7. LOAD CONNECTION - METHOD IV (PARALLEL/REDUNDANT OPERATION WITH HOT-SWAP)

2.7.5.4.1 REDUNDANCY AND HOT SWAP APPLICATIONS

HSP is specifically designed for use in critical applications where power supply redundancy and
on-line replacement of defe ctive power supplies (hot-swapping) is required. Redundant opera­tion is achieved by paralleling one or more power supplies in excess of the minimum number
required to support the load so that system operation is not compromised by the failu re of a sin­gle power supply. Any number of HSP power supplies (N+M) can be wired for redundant opera­tion as long as (N) power sup plies can support the load, M representing th e total number of
failed power supplies.

2-10 HSPSERIES OPR 081915

When operating power supplies in hot-swap applications, the use of an output blocking diode is
mandatory to prevent excessive output transients and power connector damage due to arcing at
the output terminals. In applica tions where redu ndancy is require d but hot-swa pping is not, the
blocking diode is beneficial in that it adds a layer of isolation between each power supply output
and the common d-c bus, protecting the bus against the possibility of a short at the power sup­ply output. All HSP power supply models are available with this blocking diode internally
mounted (“R” suffix option). External mounting of the blocking diode is not recommended,
because physical stresses exerted by the load cables or bus bars and imp ro per h eat d issipation
will result in premature and undetected failure of the diode.

2.7.6 LOAD SHARING

When operating two or more power supplies in parallel, either for capacity or redundancy, it is
desirable to distribute the load equally among all of the power supplies in order to improve per­formance, reduce stress and increase reliability. HSP power supplies incorporate active circuitry
which forces multiple power supplies wired in parallel to share load current, both in vo lt ag e- and
current-mode regulation. The HSP employs a single wire connection between paralleled power
supplies, forming a master-slave relationship as follows: the highest voltage unit becomes the
master, and all of the remaining units are slaved to it via the load share signal (ISHARE), which
boosts the slave outputs in order to increase load share. A maximum boost limit of 5% prevents
the slave units from following a defective master into an overvoltage condition, or from creating
a load hazard if either the slave itself or the load sharing system is defective.

When implementing load sharing, the user must ensure that all power supplies are attempting to
regulate to the same voltage at the same location, and must minimize the possibility of load
share signal corruption; the power supplies should, as nearly as possible, emulate a single large
power supply. To this end, the following rules apply:

a. If possible, remote error sensing should be employed, with all error sensing connections ter-

minated at the same physical point, and as close to the power supplies as possible; if local
error sensing is required, power lead voltage drops must be minimized. Provide local noise
decoupling capacitors across all sense wire termination points.

b. The power supplies should be located as near to each other as possible, with power term ina-

tions bussed together using adequately sized interconnections; the power supply/load inter­connections should be distributed evenly along the power supply output interconnection bus­ses. This is especially important in high-current systems employing several power supply
modules in parallel, where voltage drops in the interface connections can be significant in
comparison to the load share signal voltage and introduce both d-c and a-c errors.

c. All power supply output voltages should be adjusted as closely as possible, and in any case

within a 2% error band. Additionally, the current limit setpoints should be identical and high
enough to support the load requirements; for (N+M) systems, this means setting the current
limits high enough to tolerate loss of M power supplies and still support the load.

d. Minimize the load share signal wire interconnection lengths to reduce risk of noise influence.

HSPSERIES OPR 081915 2-11

2.7.7 SIGNAL CONNECTIONS

The I/O Signal Connector, located on the rear panel of the HSP power supply (see Figure 2-3),
provides access for all programming inputs and status signal outputs. These signals provide the
user access to portions of the regulation control circuitry of the HSP and, as such, must be pro­tected from radiated and conducted noise as well as from physical cont act with non- valid driving
sources. The following subsections address specific programming signal applications; in gen­eral, however, when accessing this connector from distant locations or high-noise environ­ments, it is recommended that a shielded cable be used, with the shield terminated to the
system's single point ground.

a. Remote Error Sense

Twist positive and negative error sensing lines (pins 37,19) together, especially when a sig­nificant distance separates the power supply and load .

b. External Voltage Programming (Voltage or Current)

Twist the programming signal line(s) (pins 18, 15, or both 18 and 15) with negative error
sensing line (pin 19); use shielded cable if possible.

c. External Resistance Programming (Voltage)

Twist both programming lines (pins 17, 35) together; use shielded cable if possible.

d. Remote Inhibit Controls (RC1, RC2)

Twist either (or both) programming lines (pins 7,8) together with AUXRTN (pin 25); if 5VAUX
is used to power the external inhibit control circuitry, include 5VAUX line (pin 26) in twist.

2.8 MECHANICAL KEYING

When used with Kepco plug-in rack adapters (RA 60 and similar), HSP power supplies can
be configured for extraction from and insertion to an active system, or “hot-swap”. Hot­swapping requires the use of series blocking diodes for each output (see Figure 2-7). The
HSP incorporates a mechanical keying system to be used in conjunction with the plug-in
rack adapters to prevent installation of any but the correct model HSP in a given position.
The keying mechanism is comprised of (7) holes, each corresponding to an HSP model; all
holes are plugged except for the “keyway,” thus providing the keying function in conjunction
with a pin installed in each rack adapter position. All HSP power supplies are keyed by volt­age at the factory. It is essential that the user: 1) not remove or alter the keyway plugs,

and 2) replace any plugs which are inadvertently removed in accordance with the
view shown in Figure 2-3. To change module keying, see instructions accompanying the

HSP series plug-in rack adapters.

2.9 RETAINING LATCHES

HSP series power supplies are provided with (2) retention latches located at each side of the
bottom edge of the front panel (see Figure 2-1). These latches work in conjunction with the HSP
series plug-in rack adapters to prevent unauthorized or inadvertent m odule 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 HSP power supply in the rack

adapter for shipping purposes.

2-12 HSPSERIES OPR 081915

SECTION 3 - OPERATING INSTRUCTIONS

3.1 OPERATING CONFIGURATION

The following subsections review th e various features and indicate how to select and operate
each function. The default settings for each function indicate the as-shipped status for standard
HSP series power supplies. Prior to applying source power, the operating configuration of the
HSP power supply must be selected. This setup is performed via the multiposition configuration
switches S1, S2 and S3 which are accessed via slots in th e top cover ( see Figur e 2-2), while the
external control signals (programming input and status output) are accessed via the I/O Con­nector on the rear panel of the HSP power supply (see Figure 2-3).

HSP series power supplies incorporate several advanced features which expand their applica­bility beyond that of simple voltage stabilizers. These functions include both internal and exter­nal programming of voltage and current regulation points, remote error sensing, active load
sharing circuitry, output overvoltage and undervoltage protection, output current “walk-in,” in-cir­cuit voltage and current setpoint monitors, and dual-mode floating inhibit controls, as well as
Form-C relay contact outputs indicating source, output and fan status, and overtemperature
shutdown.

3.2 REMOTE ERROR SENSE

All HSP power supplies are equipped with remote error sensing to compensate for the voltage
drop inherent in any power supply/lo ad interconnection scheme. The amount of compensation
varies based on output voltage: 3.3V and 5V models compensate up to 0.25V drop in each
power lead (0.5V total), while 12V through 48V models provide for up to 0.8V drop in each lead
(1.6V total). The remote error sense leads must be connected to the output power termi-

nations, either locally at the power supply output terminals or remotely at the load termi­nations, using the correct polarity, for the HSP to operate properly. (See Figures 2-4

through 2-7.)

3.3 OUTPUT VOLTAGE PROGRAMMING

HSP power supplies provide three differ ent method s for p rogrammin g the outp ut volt age r egula­tion point: internal, external resistance an d extern a l voltage. When using either internal or exter­nal resistance programming, the minimum programmable voltage is 50-60% of nominal, while
external voltage programming permits adjustment down to zero. Performance specifications are
only guaranteed over the range shown in Table 1-1. The programming method is selected via
S2 switch positions 3, 4 and 5 as follows:

NOTE: One programming mode must be selected, or the HSP output voltage programs to

zero; never select more than one programming mode at a time.

a) Internal Programming: This is the factory-set (default) mode (see Figure 2-2); when

enabled via S2-5, the output voltage is adjusted via the front panel potentiometer labeled
“V

” (see Figure 2-1).

O

b) External Resistance Programming: When enabled via S2-4, this mode provides for out-

put voltage adjustment via an external resistance or potentiometer (0-50Kohm) connected
between pins 17 and 35 (VRP1, VRP2) of the I/O connector (see Figur e 3-1). This tech­nique is useful for applications where the voltage output of the power supply must be
locked to a preset value without means of adjustment (security), or where the voltage out­put of the power supply must be remotely adjusted after installation (convenience).

HSPSERIES OPR 081915 3-1

c External Voltage Programming: When enabled via S2-3, this mode provides for output

voltage adjustment via an external voltage source (0-10V) connected between pins 18 and
19 (VPROG, -S) of the I/O connector (see Figure 3-2). This technique is useful when imple­menting digital control of the power supply output voltage via a D/A converter; Kepco's SN/
SNR 488 programmers are ideally suited to these requirements

FIGURE 3-1. EXTERNAL RESISTANCE PROGRAMMING OF OUTPUT VOLTAGE

FIGURE 3-2. EXTERNAL VOLTAGE PROGRAMMING OF OUTPUT VOLTAGE

3.4 OUTPUT VOLTAGE RANGE

The user may select the maximum programmable voltage, either high or low range, via S2
switch positions 1 and 2 (see Figure 2-2). This permits the user to trade adjustment range for
programming resolution; this is espe cia lly us ef ul wh en us ed in co nju n ctio n with e xte rn a l voltage
programming (see PAR. 3.3) for precise output adjustment (±0.2%), or for limiting the maximum
programmable voltage. Operation of range selector is as follows:

a) High Range: This is the factory-set (default) mode; the maximum programmable output

voltage is 110% of nominal V
model.

b) Low Range: When enabled via S2-1,2 the maximum programmable output voltage is

equal to the nominal output voltage V
and voltage ranges do not change, the resolution for a given programming input increment
increases by 10% for 3.3V through 28V models, and by 25% for 48V model.

NOTE: When setting the programming range, both S2-1 and S2-2 must be set to the same

position; otherwise, the fault detector voltage window will be offset from the program­ming value and will not operate properly.

3.5 CURRENT LIMIT PROGRAMMING

for 3.3V through 28V models, 125% of nominal VO for 48V

O

for all models; since the programming resistance

O

HSP power supplies provide two different methods for programming the output current limit
point: internal and external voltage. When using internal programming, the minimum program­mable current limit is 50-60% of nominal, while external voltage programming permits adjust-

3-2 HSPSERIES OPR 081915

ment down to near zero. The programming method is selected via S3 switch positions 2 and 3
as follows:

NOTE: One programming mode must be selected, or the HSP current limit programs to zero;

never select more than one programming mode at a time.

a) Internal Programming: This is the factory-set (default) mode (see Figure 2-2); when

enabled via S3-3, the current limit is adjusted via the front panel potentiometer labeled
“I

” (see Figure 2-1).

MAX

b) External Voltage Programming: When enabled via S3-2, this mode provides for current

limit adjustment via an external voltage source (0-10V) connected between pins 15 and
19 (IPROG, -S) of the I/O connector (see Figure 3-3). This technique is useful when
implementing digital control of the power supply current limit via a D/A converter; Kepco's
SN/SNR 488 programmers are ideally suited to these requirements.

FIGURE 3-3. EXTERNAL VOLTAGE PROGRAMMING OF CURRENT LIMIT

3.6 CURRENT LIMIT PROGRAMMING RAN GE

The user may select the maximum programmable current limit, either high or low range, via S3
switch position 1 (see Figure 2- 2) . T h is p erm i ts the user to trade adjustment range for program­ming resolution; this is especially useful when used in conjunction with external voltage pro­gramming (see PAR. 3.5) for precise limit adjustment, or for limiting the maximum
programmable current limit. Operation of the range selector is as follows:

a) High Range: This is the factory-set (default) mode; the maximum programmable current

limit is 110% of rated I

for all models.

O

b) Low Range: When enabled via S3-1, the maximum programmable current limit is equal to

the rated output current I

for all models; since the programming voltage range does not

O

change, the resolution for a given programming input increment increases by 10%.

3.7 SETPOINT MONITORS

HSP power supplies provide measurement ports which permit the user to verify the pro­grammed output voltage and curren t limit points while the power supply is in an active circuit,
and even when operated in a parallel/redundant configuration. These setpoint monitors access
the voltage and current loop reference sources to determine the programmed values, and con­vert these reference levels to proportional voltages readable by the user. As the quantities mea­sured are control circuit setpoints and not actual output measurements, the external operating
conditions do not influence these measurements and they remain valid even when the power
supply output is disabled; only valid source power is required.

The setpoints are available at two locations on the power supply. The first is via test probe jacks
on the front panel of the HSP, directly adjacent to their corresponding internal adjustment con-

HSPSERIES OPR 081915 3-3

trols (see Figure 2-1); the jacks are labeled VO and I
providing access to the circuit return. The second location is the I/O connector: here, the test
points are labeled VSET and ISET, and are available at pins 36 and 33, respectively, with circuit
return accessed at pin 19 (-S) (see Figure 2-3).

Measurement quantities are defined as follows:

V

, VSET: This voltage represents 1/10 of the programmed output voltage. As an example,

O

VSET (or V

) = 4.63V corresponds to a programmed output voltage of 46.3V ±1%.

O

This relationship is constant, regardles s of the programming range selected (see
PAR. 3.4).

I

, ISET: This voltage represents the percentage of available power supply current as a per-

MAX

centage of rated current, with 10V corresponding to 100%; available current is
defined as the maximum cur rent limit available based on the programming range
(see P AR. 3.6). Unlike VSET, ISET is always based on a 0-10V scale, regardless of
the range selected. For example, ISET (or I
maximum programmable current; for the low programming range, this corresponds
to 62% of the rated module curren t, but for the high program ming range the num­ber is 62% of 110%, or 68.2% of rated module current. If the module is HSP 5-200,
for example, the programmed current limit is either 124A or 136.4A, depending on
the range selection. Current setpoint monitor accuracy is ±5%.

3.8 OVERVOLTAGE PROTECTION ADJUSTMENT

, with a third test point labeled COM

MAX

) = 6.2V corresponds to 62% of the

MAX

HSP power supplies incorporate output overvoltage protection (OVP) circuitry which latches
the output regulator off in the event that the output voltage rises above a predetermined level.
Reset requires that the user remove source power for a minimum of 30 seconds (optional
remote reset is described in PAR. 3.12). The trip level is preset at the factory for 130% of the
nominal output voltage (see Table 1-1), however, this level can be adjusted from 100% to
140% of the nominal output (except Model HSP 48-21, which can be adjusted from 100% to
160% of the nominal output) via the OVP ADJUST control accessed through the top cover
(see Figure 2-2). To set the trip level to a new value, perform the following steps:

NOTE: For 48V Models only, do not set OVP trip level above 63V.

1. Disconnect any external load circuitry which may be damaged by excessive voltage; a mini­mum load of 5W is recommended (see PAR. 2.5, step 3).

2. With source power removed, connect load as shown in Figure 2-4 for local sensing, except
remove connection between I/O connector pin 37 (+S) and the output bus bar and substitute
a 20K ohm potentiometer between pin 37 and th e outp ut bus bar; ad just the pot for minimu m
resistance.

3. Rotate OVP ADJUST control on HSP fully clockwise.

4. Apply source power; while m onitoring voltage at ou tput term inals (b us bar s), incre ase ext er­nal pot resistance until the output voltage is set for the desired overvoltage protection value.

5. Slowly rotate the OVP ADJUST pot c ounterclockwise until the outp ut is latched off (voltage
drops rapidly toward zero); the overvoltage trip level is now adjusted to the desired overvolt­age protection value (step 4, above).

6. Remove source power for at least 30 seconds, or until the front panel indicator LEDs be gin
to blink; reduce the external pot resistance slightly, and reapply source power.

7. While monitoring the output voltage, slowly increase the pot resist ance u ntil the output shut s
down, and verify trip set point; if necessary, repeat steps 3 through 6 above.

3-4 HSPSERIES OPR 081915

The signal generated by the OVP detector is gated with a signal from the fault detector circuit to
produce a selective overvoltage shutdown function which prevents shutdown of operational
power supplies in a parallel-redundant power system configuration. The OVP latches of any
working power supplies are disabled, allowing only the faulty modules to be latched off; system
operation can then return to normal, assuming sufficient load capacity in the remaining modules
to support the load. This function is critical in fault-tolerant power systems, otherwise a single
overvoltage failure could ripple through all of the operating supplies and result in a complete
power system loss.

NOTE: The overvoltage protection circuit senses the voltage directly at the output terminals

of the power supply, not at the error sensing point. When selecting an overvoltage set
point, the user must take into account the expected power lead voltage drop and, if
applicable, the transient response overshoot in order to avoid false shutdowns. The
HSP design is such that the power supply cannot generate an output voltage high
enough to cause internal damage, regardless of OVP setting.

3.9 CURRENT LIMIT CHARACTERISTIC

HSP power supplies provide two different current limiting modes for different applications; selec­tion of the desired mode is accomplished via switch S1-3, accessed through the top cover of the
HSP (see Figure 2-2). The following describes the operational differences and selection method
of each:

a) Continuous Limiting: This is the factory-set (default) mode of operation. When the output

current of the power supply reaches the programmed current limit, the output regulator
switches to current mode operation and maintains the output current by modulating the out­put voltage; this operating mode is ma intained indefinitely, and recovery to voltage regula­tion mode is automatic upon reduction of the output current below the current limit point.
This mode is ideal for high-power battery char gers and application s where oper ation in cur­rent regulation mode is normal, or where immediate recove ry from an overload cond ition of
any duration is critical.

NOTE: HSP power supplies are designed to maintain continuous delivery of 110% of rated

current indefinitely. When operating parallel/redundant power supply configurations in
continuous limiting mode, the user must size the power supply/load interconnection
conductors to withstand the total maximum load current available from all of the paral­leled power supply modules.

b) Undervoltage Lockout: This mode is enabled when S1-3 is set to ON (Figure 2-2). The

crossover from voltage- to current-mode operation is the same as for Continuous Limiting;
however, after approximately 15 seconds, the output load regulation circuit is locked off via
the overvoltage protection latch, requiring the user to recycle source power to restart the
power supply (see PAR. 3.8). This mode permits automatic recovery from short-term over­loads, but eliminates the danger of overheating and damage to the load and load wiring
due to continuous exposure to high current; this is especially useful in redundant power
systems, where the continuous overload current of all of the paralleled power supply mod­ules can be in excess of twice the normal load current. As the circuit is triggered by the
occurrence of an output undervoltage condition, this circuit can also protect circuits which
may be unduly stressed in the presence of an extended undervoltage condition; an exam­ple of this are batteries, which can be damaged by discharge voltages below a specified
minimum.

NOTE: When undervoltage lockout mode is enabled, it is necessary to also enable the

Remote Reset function (see PAR. 3.12) in order for the Remote Inhibit function to oper­ate properly.

HSPSERIES OPR 081915 3-5

3.10 CURRENT WALK-IN CIRCUIT

HSP power supplies incorporate a specialized output regulator start-up circuit for applications
involving use of the HSP as a battery charger. This circuit, enabled via switch S1-2, overrides
the normal duty-cycle-based soft-start circuit, which could still result in very fast output current
rise rates into a discharged battery, and substitutes a controlled-current rise circuit with a time
constant in accordance with Bellcore TR-TSY-000947 requirements for telecommunications bat­tery rectifiers (see Figure 3-4). The circuit is reset each time that the output regulator is shut
down. This circuit is targeted for battery charger applications, but is ideal for any application
which draws very large currents at power-up, such as high-capacitance loads, where this large
current spike could result in circuit disruptions due to indu ctiv e co up ling .

FIGURE 3-4. CURRENT WALK-IN CHARACTERISTIC

3.11 5VAUX FLOATING SUPPLY

HSP power supplies are equipped with an internal auxiliary supply which provides 5V at loads
up to 100mA. It is derived from the inte rnal cooling fan supply and is, therefore, present when­ever the source power is within specification and the internal bias supply is operating, regard­less of the status of the output regulator. This supply is SELV and is isolated from the output
power lines as well, permitting the user to employ this supply to power circuits which do not
share the same ground return as the output; in fact, this supply provides interface power for the
remote inhibit control signals (see PAR. 3.12). Typical applications include single-circuit control
of several HSP power supplies operating at various potentials and polarities with respect to the
controller. The output is protected against overload, and is diode isolated to permit paralleling
with the auxiliary outputs of other HSP units (regardless of model) for additional load capacity or
redundancy. This output is available at I/O connector pins 26 and 25 (5VAUX and AUXRTN,
respectively).

3-6 HSPSERIES OPR 081915

3.12 REMOTE INHIBIT/REMOTE RESET CONTROLS

HSP power supplies incorporate two TTL-level inputs, RC1 and RC2, accessed via the I/O con­nector, which can be used to disable the output regulator via external stimulus. These two con­trols operate from an internal 5V supply (5VAUX) which is isolated from both input and output
(see PAR. 3.11), creating a “floating” inhibit control circuit which allows the user to control sev­eral HSP power supplies operating at different return potentials from a single source. The two
control lines differ in that RC1 (pin 8) is normally high, initiating an output inhibit with applica tion
of a low signal level, while RC2 (pin 7) is normally low and requires application of a high level
signal to inhibit the output; both of these signals are applied with respect to AUXRTN (see Fig­ure 3-5), and can be operated at potentials as much as ±500V from the HSP output(s).

These two signal levels are TTL-compatible, both for voltage levels and so urce /sink cap abili ty. If
not actively driven, these signals have no effect on power supply operation. Activation of eith er
one of these control lines results in an immediate shut down of the outpu t PWM regulator, includ­ing reset of the soft-start, undervoltage, and current walk-in circuits. Operation is inhib ited until
the appropriate control line is released, whereupon the power supply output restarts as from ini­tial cold turn-on.

An additional function which can be derived from the remote inhibit control circuitry is the ability
to reset the overvoltage/undervoltage latch circuitry without cycling t he source power (Remote
Lockout Reset). When this function is enabled via switch S1-1, the latch can be reset by toggling
one of the inhibit control signals from enable to disable and back. The main advantages of this
remote reset function are the ability to reset the power supply from a remote location and an
instantaneous reset time (compared to the 30-second minimum waiting period imposed when
cycling the source power for reset).

3.13 MODULE CURRENT MONITOR

HSP power supplies provide a 0-5.5V analog signal named IMON, accessed via I/O connector
pin 32, which duplicates the signal level of the load sharing feedback signal (ISHARE) gener­ated by each HSP. This permits the user to determine the load being provided by each module
within a parallel or redundant power system co nfiguration. The IMON signal is current-limited

HSPSERIES OPR 081915 3-7

FIGURE 3-5. REMOTE INHIBIT CONTROL OPERATION

and isolated from the ISHARE signal, so that it cannot affect the load share function if shorted.
The voltage level of this signal is generated with respect to the negative sense return (pin 19).

3.14 STATUS INDICATORS AND STATUS FLAGS

HSP power supplies provide both visual and electrical indication of the status of various critical
functions including source power status, output status, fan status and overtemperature condi­tion; both visual and signal indicators are provi ded. V isual indication is provided via the four LED
indicators located on the front panel (see Figu re 2-1). Signal indication is obtained via four sets
of Form C dry relay contacts accessed via the I/O connector; all three contacts are provided to
the user, permitting the selection of either normally-open (NO), normally-closed (NC) or both for
any application (refer to Table 2-1). The definition of “normal” in this instance refers to the st atus
of the contacts when the HSP is powered and operating normally (no fault); status flag outputs
remain valid even when source power is removed. These relay contacts are SELV and are iso­lated from each other and from the output by 100V d-c to permit flexibility in application. A
description of the function of each status signal follows. Table 3-1 indicates the condition of sta­tus flags and indicators for normal, fault, and no power conditions.

TABLE 3-1. STATUS INDICATORS AND FLAGS

CONDITION SIGNAL/INDICATOR

STATUS **

NORMAL * FAULT DETECTED

NO POWER

APPLIED

POWER INDICATOR

SOURCE

POWER
STATUS

OUTPUT

STATUS

FAN

STATUS

OVERTEMPERATURE

STATUS

* NORMAL IS DEFINED AS THE HSP POWERED AND OPERATING WITH NO FAULTS (SOURCE POWER WITHIN

SPECIFICATIONS, OUTPUT POWER WITHIN RATED LIMITS, FAN OPERATING, AND NO OVERTEMPERATURE CON­DITION SENSED).

SOURCE POWER STATUS NC

SOURCE POWER STATUS NO

DC FAIL INDICATOR

OUTPUT STATUS NC

OUTPUT STATUS NO

FANFAIL INDICATOR

FAN STATUS NC

FAN STATUS NO

OVERTEMP INDICATOR

OVERTEMP STATUS NC

OVERTEMP STATUS NO

ON (GREEN) OFF OFF

CLOSED OPEN OPEN

OPEN CLOSED CLOSED

OFF ON (RED) OFF

CLOSED OPEN OPEN

OPEN CLOSED CLOSED

OFF ON (RED) OFF

CLOSED OPEN CLOSED

OPEN CLOSED OPEN

OFF ON (AMBER) OFF

CLOSED OPEN CLOSED

OPEN CLOSED OPEN

** CLOSED AND OPEN ARE REFERENCED TO THE ASSOCIATED STATUS COMMON TERMINATION.

NOTE:UPON INITIAL TURN-ON, FAN AND OVERTEMPERATURE STATUS LINES WILL BE IN “NORMAL” CONDITION

UNLESS A FAULT CONDITION IS SENSED.

3-8 HSPSERIES OPR 081915

3.14.1 POWER INDICATOR/SOURCE POWER STATUS FLAGS

Monitors available source voltage to determ ine if sufficient energy is available to sustain rated
output for normal operation. These signals indicate a fault condition until the bulk voltage is
greater than 390V d-c. Once the bulk voltage reaches 390V d-c (indicating that the PFC boost
converter is operating and assuring that full ride-through time is available at rated load) these
signals revert to “normal” (see Table 3-1). These signals will indicate a fault a minimum of 5 mil­liseconds prior to loss of output regulation due to source power loss, providing a transparent
source power ride-through time of 21.5 milliseconds; POWER ST ATUS is not reset until the bulk
d-c again reaches 390V d-c; see Figure 3-6 for timing relationships.

FIGURE 3-6. TIMING DIAGRAM FOR POWER AND DCFAIL STATUS

HSPSERIES OPR 081915 3-9

3.14.2 DCFAIL INDICATOR AND OUTPUT STATUS FLAGS

The OUTPUT status flags and DCFAIL indicator LED are both controlled by the output fault
detector circuit, which monitors both output voltage and module current to assess d-c output
status. An output fault condition (DCF AIL indicator “ON” ) is generated if o ne of th ree fa ult co ndi­tions is detected: (1) Overvoltage fault or (2) Undervoltage Fault - output voltage is outside
specified regulation limits, or (3) Undercurrent fault - the power supply module is supplying less
than 70% of the current required by the circuit (as indicated by the load sharing signal) while the
output voltage is within specification limits.

A fault condition is not generated for a combination of overvolta ge and under current in dications,
as these are mutually exclusive conditions for power supplies which are not part of a parallel­redundant configuration; this combination does, however, indicate proper operation for opera­tional power supply modules which are part of a parallel-redundant power scheme in which one
or more power supply modules are presenting overvoltage failures.

Table 3-2 provides an operating matrix of the DCFAIL status function; see Figure 3-6 for timing
relationships. The output voltage fault limits are ±5% of programmed output voltage, while the
undercurrent fault limit is <70% of required module current; signal reset requires output voltage
recovery to within the specified ±1% regulation range and/or module current recovery to >85%
of required module current, respectively.

TABLE 3-2. FAULT DETECTOR OPERATION

UNDERVOLTAGE UNDERCURRENT OVERVOLT AGE DCFAIL ST ATUS

NNNOFF
YX*ON
NYNON

*NYON
*YYOFF

Y = YES; N = NO; X = DON'T CARE; * = EXCLUDED BY ANOTHER ASSUMED CONDITION

3.14.3 OVERTEMP INDICATOR AND STATUS FLAGS

This fault is generated in the event that either the input or output module heatsink temperature
rises above a safe operating level; output regulator shutdown occurs simultaneously. Recovery
occurs automatically upon reduction of internal temperatures to normal levels.

3.14.4 FANFAIL INDICATOR AND STATUS FLAGS

This fault is generated in the event of a failure of the internal cooling fan; a delay of approxi­mately 5 seconds is incorporated to prevent nuisance indications at tur n-on. Reset occu rs whe n
fan operation resumes.

3.15 FRONT PANEL METER (M OPTION) OPERATION

HSP series power supplies are available with a meter option (‘M' suffix) which incorporates a 3½
digit LED meter display on the front panel. The meter prov ides both voltmeter and ammeter
functions. The V-A rocker switch directly below the meter (Figure 3-7) selects either o utpu t volt ­age (V) or module current (A) as the normally-displayed parameter. The associated LED, either
V or A, lights to show the selected switch position. When depressed, the ACTUAL/SETPOINTS
momentary-contact switch located below the V-A selector switch causes the meter to display the
programmed value of output vo ltage or current limit, as selected by the V-A switch. The opera-

3-10 HSPSERIES OPR 081915

tion of the fault detector remains unaffected by the inclusion of the meter option. The following
paragraphs describe the meter functions in detail.

3.15.1 VOLTMETER OPERATION

With the V-A selector switch set to ‘V' position (green V indicator illuminated), the meter nor­mally displays the actual output voltage present at the error sense terminals (within ±2%). If the
ACTUAL/SETPOINTS switch is depressed with the V-A selector switch set to V, the display
shows the programmed output voltage (±1%) of that module, regardless of the actua l output st a­tus at the time (refer to VSET, PAR. 3.7); unlike VSET, however, both actual and setpoint volt­ages are displayed in volts. If desired, the programmed setpoint can be adjusted using the
previously selected output voltage programming me thod (PAR. 3.3) . Releasing the ACTUAL/
SETPOINTS switch causes the meter to resume displaying actual output voltage.

3.15.2 AMMETER OPERATION

With the V-A selector switch set to ‘A' position (amber A indicator illuminated), the meter nor­mally displays the actual output current (within ±12%) presently being supplied by the mo dule. If
the ACTUAL/SETPOINTS switch is depressed with the V-A selector switch set to I, the display
shows the programmed current limit (±1%) of that module, regardless o f the actual cu rrent being
supplied at the time (ref. ISET, PAR. 3.7); unlike ISET and ISHARE, however, both actual cur­rent and setpoint current limit are displayed in amperes. If desired, the programmed setpoint for
current limit can be adjusted using the previously selected current limit programming method
(PAR. 3.5). Releasing the ACTUAL/SETPOINTS switch causes the meter to resume displaying
actual module output current.

NOTE: Ammeter accuracy of ±12% applies for load currents between 25 and 100% of rated

output current (e.g., between 50 and 200 Amperes for HSP 5-200). For load currents
less than 25%, ammeter accuracy degrades significantly.

3.15.3 PARALLEL/REDUNDAN T OPER ATION

The display function is fully operational when HSP is used either singly, as a stand-alone power
supply , or in multip les, as part of a p arallel/r edundant or series load ar rangement. When used as
part of a parallel/redundant power system, however, the following points should be noted.

When the meters are functioning as voltmeters:

• The actual voltage displayed by each power supply module represents the output bus
voltage, and not the individual voltage supplied by each module.

• The setpoint function, however, does display the individual setting for the specific power
supply module being measured, thus allowing on-line calibration of all of the power sup­ply modules in the system.

When the meters are functioning as ammeters,

• The actual current displayed by each power supply module represents actual module
output current regardless of output configuration.

• The setpoint function for current limit displays the individual setting for the specific powe r
supply module being measured,

HSPSERIES OPR 081915 3-11

3.16 BATTERY (B OPTION) OPERATION

The Battery Charger Option (B suffix) adds a second switch-selectable voltage network to the
front panel. This permits the user to preset two dif ferent volt age regu lation values corr esponding
to “float” and “equalize” functions for battery charging applications. This option is available for
1000W HSP models covering 12V, 24V and 48V, and 1500W models covering 24V and 48V
nominal battery voltages.

When the Float-Equalize switch is set to FL (see Figure 3-7), the Float potentiometer adjusts the
output voltage; when set to EQ, the Equalize potentiometer adjusts the output voltage. The FL­EQ position also determines which voltage is available at test point Vo. CAUTION: Adjusting the
non-selected potentiometer (e. g., FL potentiometer with switch set to EQ) can have adverse
effects, because an unknown output voltage will be applied to the load when the switch position
is changed. The fault detector window is altered to accommodate the normal range of battery
voltage from fully discharged to peak equalize charge as shown in Table 3-3.:

TABLE 3-3. B OPTION FAULT DETECTION WINDOW

NOMINAL BATTERY VOLTAGE KEPCO MODEL MIN. VOLTS MAX. VOLTS

12V HSP 15-66B 10.6 14.6
24V HSP 28-36B, HSP 28-53B 21.1 29.2
48V HSP 48-21B, HSP 48-30B 42.2 58.4

The programmed current limit (Imax) applies to both float and Equalize operation. If the M
option is also included, the meters operate as described above (see PAR. 3.15) exce pt that the
displayed setpoint value is determined by the FL-EQ switch.

FIGURE 3-7. HSP M (METER) OPTION AND B (BATTERY CHARGER) OPTION, FRONT PANEL

3-12 HSPSERIES OPR 081915