KEPCO RKW 3.3-7K, RKW 5-6K, RKW 12-2.5K, RKW 15-2K, RKW 24-1.3K Instruction Manual

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

30 WATT SINGLE OUTPUT

OPEN FRAME POWER SUPPLIES

I — INTRODUCTION

SCOPE OF MANUAL. This instruction manual covers

the installation and operation of the Kepco RKW 30W
Series of Open Frame, RoHS (Reduction of Hazardous
Substances) compliant, switching power supplies.

DESCRIPTION. The Kepco RKW 30W Series consists of
six models of switching power supplies, with a single output
as shown in Table 1. Units may be operated with a nominal
100V a-c to 240V a-c (input voltage range 85 to 265 Va-c),
50-60 Hz

440Hz although leakage current and efficiency specifications may
not be met).

input. The RKW 30W Series employs a MOSFET switch
flyback converter with a fixed switching frequency of
approximately 60kHz. Regulation is provided by pulse

(input frequency range 47-66Hz; units operate up to

They will also operate on 110V to 370V d-c

RKW

30W SERIES

width modulation. A thermistor prevents excessive turn-on
current surge. Overvoltage and overcurrent protection is
provided. Current limiting with automatic recovery from
short circuit is featured. Units are convection cooled L­chassis construction. A steel cover (Model CA 33-R) is
available as an option (contact factory for derating with
cover).

Specifications and operating limits for individual RKW 30W
models are listed in Table 1. Section II describes RKW 30W
features. Section III contains specifications and operating
limits common to all RKW 30W Series Models. Section IV
describes installation and Section V describes operation.

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, RKW 30W SERIES

MODEL

OUTPUT VOLTS, d-c

ADJUSTMENT RANGE, Vd-c

OUTPUT CURRENT (AMPS)

-10 to +50 °C

CURRENT LIMIT

OVP SETTING

EFFICIENCY

RIPPLE

AND

(3)

NOISE

(mV p-p)

(1) After the cause of the overload is removed, output is automatically restored.
(2) An overvoltage shuts down the output. Recover by recycling a-c input (60 second delay required before resetting).
(3) Bandwidth 100 MHz. Ripple and noise will be approximately 1.5 times these values in the operating temperature range -10 ~ 0°C. The

ripple and noise values tabulated are valid when the output is derated as shown in figure 2 from 50 ~ 65°C.

(4) Peak Current: 2.0A (useful for motor start applications).

(1)

(AMPS)

(2)

(VOLTS)

100 Va-c

200 Va-c

Switching ripple

(typ)

spike noise

(1)

(typ)

RKW 3.3-7K RKW 5-6K RKW 12-2.5K RKW 15-2K RKW 24-1.3K RKW 48-0.65K

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

2.85-4.0 4.0-5.8 9.6-13.2 12-16.5 19.2-26.4 38.4-52.8

7.0 6.0 2.5 2.0

7.9 min 6.3 min 2.6 min 2.1 min 2.1 min 0.68 min

4.2-5.2 6.0-6.9 13.7-15.7 17.0-19.0 27.0-30.5 55.0-60.0

75% 77% 81% 81% 84% 84%

76% 78% 82% 83% 85% 85%

80 80 100 100 100 130

120 120 150 150 150 200

1.3

(4)

0.65

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II — FEATURES

• Green Output on LED indicator

• Overvoltage/Overcurrent protection

• Power Factor Corrected, wide range a-c input

• Convection cooling

III — SPECIFICATIONS

The following specifications are at nominal input voltages
at 25°C unless otherwise specified.

INPUT:

Voltage: 100-240V a-c nominal; Range 85-265V a-c

(0 to 100% load, -10 to 71°C); 110-370V d-c.
(polarity insensitive; consult factory) Safety
agency approval applies only to a-c input opera­tion.

Frequency: Nominal 50-60 Hz; Range 47-440Hz

to 100% load, -10 to 71°C),

(at 440Hz leakage cur-

rent exceeds UL/VDE safety specification limit).

Current (nominal output at 100% load):

@100-120V a-c rms:

5V-48V models:

0.85A a-c rms max. 0.65A typ.

3.3V model: 0.7A rms max., 0.55A typ.

@200-240V a-c rms:

5V-48V models:

0.45A a-c rms max. 0.38A typ.

3.3V model: 0.4A rms max., 0.33A typ.

Input Protection and Soft Start: Units are protected

against shorts by an input fuse. Fuse value 2A,
250V.

Initial Turn-on Surge: (cold start 25 °C, 100% load,

first surge only, not including the current flow into
the EMI filter):
@100V a-c rms: 12.5A typ.,
@200V a-c rms: 25A typ.

Switching Frequency: 60kHz typical (flyback) nomi-

nal load

LEAKAGE CURRENT:

@120V a-c and 60 Hz: 0.55mA max, 0.32mA typ.
@240V d-c and 60 Hz: 0.75mA max, 0.50mA typ.
(operating in conformance with UL 1950/IEC 950)

STABILIZATION:

Source Effect (Range 85 to 132Va-c or

170-265 Va-c):

5V to 48V Models: 0.1% typ., 0.2% max.

3.3V Model: 5mV typ., 10mV max.

Load Effect, measured at sensing terminals

(0% - 100% of rated output current):
5V to 48V Models: 0.3% typ., 0.6% max;

3.3V Model: 15mV typ., 30mV max.

Temperature effect: (-10 to 71°C)

0.5% typ., 1.0% max.

Combined effect: 0.9% typ., 1.8% max.

Drift: (1/2 to 8 hr. at 25°C) 0.2% typ., 0.5% max.

(0

• SEMI-47 compliant

• RoHS compliant

• DIN-Rail mountable

• Series Operation

FIGURE 1. OUTPUT POWER VS. TEMPERATURE

TRANSIENT RECOVERY: A step load change from
50% to 100% of rated output current in 50 microseconds
or more, produces no more than 4% output voltage excur­sion (3.3V model: ±200mV max.). Recovery time is 1ms
maximum.

OUTPUT HOLDING TIME: Upon input interruption
the output is maintained for:

@100V a-c: 35 mS typ. (20 mS min.)

@240V a-c: 230 mS typ. (130mS min.).

START UP TIME:

@100V a-c: 900mS max., 600mS typ.

@240V a-c: 400mS max., 200mS typ.

OVERVOLTAGE PROTECTION: Fixed, factory set.
See Table 1. The overvoltage circuit is set by Zener diode
clamp, latching will occur.

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OVERCURRENT: Output voltage returns to rated level
upon removal of cause of malfunction.

OPERATING TEMPERATURE: -10 to 71°C (start up ­20 to -10°C). See the derating, Figure 1. Do not allow the
power supply to become dust covered because that will
decrease the cooling efficiency of the unit and cause insu­lation to deteriorate.

STORAGE TEMPERATURE: -30°C to + 75°C.

COOLING: Natural convection.

ORIENTATION: Vertical or horizontal.

HUMIDITY: 10% to 95% RH, operating and storage,

noncondensing, wet bulb temperature < or = 35°C.

DIELECTRIC STRENGTH: (at 15 to 35°C ambient, 10

to 85% relative humidity, cutout current 20 ma):

Between input and output terminals:

3.0 KV a-c for one minute.

Between input terminals and ground:

2 KV a-c for one minute.

Between output terminals and ground:

500V a-c for one minute.

INSULATION RESISTANCE: Between input and out-

put, input and ground, output and ground: 100
megohms minimum (500V d-c, 15 to 35°C ambi­ent, 10 to 85% relative humidity)

VIBRATION: Three axes, one hour each, sweep time 10

min:, nonoperating:
5-10 Hz., 10 mm amplitude.
10-200 Hz., 2G (19.6m/s

2

).

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

shocks to each axis):
Acceleration: 60G (588m/s
Duration: 11mS +

5mS

2

),

EMC - EMISSIONS:

Radiated Noise 30MHZ to 1GHz: FCC Class B,

VCCI-B, EN55011-B, EN55022-B

Conducted Noise 0.15MHz to 30MHz:

FCC Class B, VCCI-B, EN55011-B, EN55022-B

Input Harmonics (on AC Mains) 0 to 2kHz:

EN 61000-3-2.

EMC - IMMUNITY:

ESD: EN 61000-4-2 Level 4, Normal operation.

Radiated Field Noise:

EN 61000-4-3 Level 3, Normal operation.

Electrical Fast Transient/Burst (EFT):

EN 61000-4-4 Level 3, Normal operation.

Surge: EN 61000-4-5 Level 4, no damage.

Conducted Noise:

EN 61000-4-6 Level 3, Normal operation.

Power Frequency Magnetic Field:

EN 61000-4-8 Level 4, Normal operation.

Voltage Dips, Short Interruptions, Voltage Variation:

EN 61000-4-11, Normal operation.

SAFETY: All units designed to meet EN 60950 (U.S. UL
60950 3rd Ed.; Canada: CAN/CSA-22.2 No. 60950-00 3rd
Ed. (ambient temp. 50°C). RKW 30W units are CE marked
per the Low Voltage Directive (LVD), EN60950. [The stan­dards do not apply with DC input operation]

WEIGHT: 10.5 oz. (300 grams) max

WARRANTY: One year.

IV — INSTALLATION

MOUNTING THE POWER SUPPLY: Refer to Fig-

ures 3 and 4. The unit may be mounted on one mounting
surface. Note the restrictions for maximum penetration of
mounting screws. The air surrounding the power supply
must not exceed the ambient values given in the graph in
Figure 1.

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CONNECTIONS: Connect the load to the power supply
Output + and Output – terminals shown in Figure 2. The
AC input power is applied via the terminal block. Make sure
to connect the AC input Neutral, Line and Ground wires to
the respective terminals of the terminal block (see Figure

2).

V — OPERATION

When output voltage is available, the green LED is on.
The Output Voltage Adjust trimmer (see Figure 2) allows
adjustment of the output voltage within the range specified
in Table 1.

OUTPUT VOLTAGE ADJUST TRIMMER

OUTPUT VOLTAGE ON INDICATOR

SERIES OPERATION: When a number of power sup­plies are operating in series, the current rating is to be lim­ited to the rating of the power supply with the lowest

rating. A diode (Vr>2 Vo, If>2Io, Vf<< low) must be con-

Σ

nected to the power supply output terminals to protect the
unit from reverse voltage.

OUTPUT +
OUTPUT -

GROUND

LINE

NEUTRAL

+

-

30W

MODELS

L
N

FIGURE 2. COMPONENT LOCATIONS

FIGURE 3. POWER SUPPLY MOUNTING

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FIGURE 4. RKW 30W MECHANICAL OUTLINE DIAGRAM

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