Kepco RAX 48-6K, RAX28-10K, RAX 24-12K, RAX 15-20K, RAX 12-25K Datasheet

INSTRUCTION MANUAL

KEPCO

An ISO 9001 Company.

RAX

300 WATT SINGLE OUTPUT

SWITCHING POWER SUPPLIES

I — INTRODUCTION

SCOPE OF MANUAL.

ing Power Supplies. For service information, please refer to the Service Manual for the RAX 300W Series, which can be pur­chased either from your Kepco Representative, or by writing directly to: Kepco Inc. 131-38 Sanford Avenue, Flushing, New York
11352, U.S.A. When ordering a Service Manual, please state

supply

. This information can be found on the nameplate of the unit.

DESCRIPTION.

in Table 1. Units may be operated with either 115V a-c or 230V a-c 47-440Hz input. They will also operate on 240V to 370V d-c
input. The RAX 300W Series employs a light weight ferrite core with 145 KHz switching frequency. Regulation if provided by
pulse width modulation. A FET power stage, operating in the forward conversion mode provides a smooth isolated d-c output. A
triac “soft-start” circuit prevents excessive turn-on current surge. Overvoltage protection and optically isolated remote TTL on-off
control is provided. Current limiting with automatic recovery from short circuit is featured. Units are enclosed in a wrap-around
aluminum case with an LED “output present” light visible on the terminal side of the case.

Table 1 contains specifications and operating limits of individual RAX 300W Series models. Section II (following) contains spec­ifications and operating limits common to all RAX 300W Series Models.

II — SPECIFICATIONS

This instruction manual covers the installation and operation of the Kepco RAX 300W Series of Switch-

Model Designation and Serial Number of your RAX power

The Kepco RAX 300W Series consists of six models of switching power supplies, with a single output as shown

CAUTION: UNIT IS SET
TO 115V AC OPERATION

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

TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, RAX 300W SERIES

MODEL

OUTPUT VOLTS, d-c

ADJUSTMENT RANGE

MAXIMUM

OUTPUT

RATINGS

(AMPS,

WATTS)

CURRENT LIMIT (AMPS)

OVP RANGE (VOLTS)

RIPPLE

AND

NOISE

(mV p-p)

(1) Change of current setting with the specified variations for operating temperatures and source input voltage is within ±10% of the rated values.
(2) Source component 2x source frequency, and switching component approximately 145KHz.
(3) Measured with a 50 MHz bandwidth.

INP UT V OLTA GE :

switching (typ)

(2)

switching (max)

50° C amb.

60° C amb.

71° C amb.

source (typ)

source (max)

spike noise

(3)

(max)

(1)

(Jumper selectable, see Section III, FIG. 3):

RAX 5-60K RAX 12-25K RAX 15-20K RAX 24-12K RAX28-10K RAX 48-6K

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

4.0 - 5.5V 8.4 - 13.2V 12.0 - 16.5V 16.8 - 26.4V 19.6 -30.8V 32.6 - 52.8V

60.0A/300W 25.0A/300W 20.0A/300W 12.0A/288W 10.0A/280W 6.0A/288W

42.0A/210W 17.5A/210W 14.0A/210W 8.4A/201.6W 7.0A/196W 4.2A/201.6W

24.0A/120W 10.0A/120W 8.0A/120W 4.8A/115.2W 4.0A/112W 2.4A/115.2W

65.0 - 70.0 28.0 - 30.0 22.0 - 24.0 13.2 - 14.4 12.0 - 16.0 6.8 - 7.4

6.0 - 6.9 13.7 - 15.7 17.0 - 19.5 27.0 - 30.5 32.0 - 35.0 55.0 - 63.0

5 1515253035

10 30 30 40 60 90

25 25 25 25 25 25

40 50 50 60 60 60

100 170 200 290 330 530

120V a-c nominal, range: 85 -132V a-c, (90-132V a-c for model RAX 28-10K)
220-240V a-c nominal, range: 170 -264V a-c , (180-264V a-c for model RAX 28-10K)

320V d-c nominal, range: 240 -370V d-c
For d-c input the jumper is placed in the 230V position.

INPUT SOURCE FREQUENCY:

Nominal 50/60 Hz; Range 47-440 Hz. (At 440 Hz the leakage current exceeds the VDE safety specification limit.)

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BROWNOUT VOLTAGE:

120V a-c input selection, 80V a-c min. (85V a-c min. for model RAX 28-10K)
220-240V a-c input selection, 160V a-c min. (170V a-c min. for model RAX 28-10K)
320V d-c input selection, 220V d-c min. (Jumper in 230V a-c position)

INPUT CURRENT:

(maximum load at 50°C with nominal output voltage):

INPUT SOURCE NOMINAL INPUT VOLTAGE MINIMUM INPUT VOLTAGE

120 V a-c input selection 4.6A typ. - 6.0A max. 6.0A typ. - 7.2A max.

220-240V a-c input selec­tion

d-c input selection 7.0A max. (320V input) 9.0A max. (240V input)

INPUT PROTECTION AND SOFT START:

by an input fuse. Fuse value 10A.

INPUT SURGE:

At 25°C from cold start:

NOTE: There are two input surges at turn-on:

INPUT SOURCE FIRST SURGE (5ms max.) SECOND SURGE (3ms max.)

120 V a-c input selection 20A max. 15A typ.

220-240V a-c input selec­tion

320V d-c input selection 40A max. 40A typ.

EFFICIENCY:

77% typical

STABILIZATION:

CHARACTERISTIC TYPICAL MAXIMUM

Source Effect (min - max) 0.8% 1.5%

Load Effect, measured at sensing terminals (10% - 100% load change) 0.8% 1.5%

Temperature effect (0 to 71°C) 1.0% 2.0%

Combined effect (envelope) 2.0% 4.0%

Drift (8 hr. at 25°C) 0.1% 0.5%

2.8A typ. - 3.6A max. 3.3A typ. - 4.0A max.

A triac soft start circuit reduces start-up surge. Units are protected against shorts

40A max. 10A typ.

TRANSIENT RECOVERY:

A step load change from 50% to 100% of rated load in 50 microseconds or more, produces no
more than 4% output voltage excursion (or 0.5V, whichever is greater). Recovery to 1% (or 0.05V, whichever is greater) of
the original voltage is less than 1 millisecond.

OUTPUT HOLDING TIME:

Output is maintained for 20 milliseconds minimum upon input interruption (30 milliseconds typi-

cal) with nominal input voltage and output load at 50°C current rating.

CURRENT LIMIT AND OVERVOLTAGE PROTECTION:

Overvoltage interrupts operation until the unit is turned off and
then turned back on for a reset period of approximately 20 seconds. When output falls below 0.7 of nominal due to reaching
the output current limit, output is maintained for approximately 20 seconds. After this time, the output is shut off and the fan
stops. The source must then be turned off and back on for reset. Reset requires about 30 seconds.

OPERATING TEMPERATURE:

STORAGE TEMPERATURE:

HUMIDITY:

20% to 95% relative humidity, noncondensing

0 -71°C. See the derating graph, Figure 1.

-20°C to + 75°C.

ALTITUDE:

Operating: 10,000 feet (3048.0m)
Nonoperating: 35000feet (10668m)

ISOLATION:

(25°C ambient 65% relative humidity):
Between input and output terminals, 3.75 KV a-c for 1 minute (with Y-capacitors removed).
Between input and output or chassis, 2000V a-c for 1 minute.
Between output terminals and chassis, 500V a-c for 1 minute.

INSULATION RESISTANCE:

Between output and chassis, 100 megohms minimum (500V d-c)

LEAKAGE CURRENT:

0.5mA max at 120V a-c (U.L. Method)

0.75mA max at 240V d-c (U.L./VDE Method)

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VIBRATION:

SHOCK:

EMI CONDUCTED:

SAFETY:

Three Axes: 5-10 Hz., 10 mm amplitude; 10-55 Hz., 2G

Three axes, 20g, 11 ms ±5msec pulse duration

FCC Class A

All units designed to meet UL 1950D3, UL 478, CSA
Electrical Bulletin 1402C, VDE 0806, TÜV Rheinland EN60950 and
IEC 950 Safety Standards. RAX are CE marked per the Low Voltage
Directive (LVD), EN60950. [The standards do not apply with DC input
operation].

REMOTE ERROR SENSING:

5-60K models, up to 0.25V per load wire.
All other models, up to 0.4V per load wire. The power supply is factory
set with links in place.

REMOTE CONTROL ON/OFF:

“High,” 2.4V-24V (or open), unit ON
“Low,” 0.0V-0.4V (or closed), unit OFF
When Remote Control (RC) is at “Low” level, the output voltage

FIGURE 1. TEMPERATURE DERATING

remains Vo <0.5V.
Vo <5.0% of nominal output for 12, 15, 24, 28 and 48 volt models

III — OPERATION UNIT WILL NOT WORK WITH SENSE LEADS DISCONNECTED (SEE FIG. 2).

INSTALLING THE POWER SUPPLY:

Mounting holes are provided for each mounting style. The air surrounding the power supply must not exceed the ambient val­ues given in the graph in Figure 1.

CONNECTING AND SWITCHING THE LOAD:

the load terminals to compensate for voltage loss in the connecting wires. The jumper links must therefore be removed from
the sense terminals.

SELECTING INPUT VOLTAGE:

for 120V a-c operation. Change the jumper to the position marked “230V” to operate the unit from a nominal 220-240V a­c or 320V d-c source.

VOLTAGE ADJUSTMENT:

The unit is provided with a voltage adjustment control. To adjust voltage, first place the unit under
an operating load, then monitor the + and - sense terminals with a precision voltmeter and turn the voltage control to the
desired operating value. Refer to Table 1 for Adjustment Range.

CHANGING FUSE:

Remove the cover to replace a fuse (10A, 250V). Refer to Figure 3.
The fuse holder will accept two sizes, either:
KEPCO P/N: 541-0125 or Manufacturer LITTLEFUSE P/N 314010; 10A, 250V (1/4” x 1-1/4”)
KEPCO P/N: 541-0099 or Manufacturer LITTLEFUSE P/N type F 217010; 10A, 250V (5mm x 20mm)

Refer to Figure 4. The unit may be mounted on one of the three mounting surfaces.

The load is connected as shown in Figure 2. Error sensing may be done at

Input voltage is selected with a jumper. Refer to Figure 3. The power supply is delivered

REMOTE TURN-ON TURN-OFF

When power is on at the source the unit may be turned on or off with the remote control fea­ture. The output of the remote turn-on/off RC (remote control) terminals operates at TTL logic levels (2.4V-24V “high” and 0.0
to 0.4V “low”). The unit is turned off by bringing the RC terminals to “low” logic level with a switch or solid state device. If the
remote on/off feature is not desired, the terminals should be left open.

LINKS

(SEE NOTE)

FIGURE 2. CONNECTING THE LOAD WITH ERROR SENSING

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NOTE:
THE SENSE LEADS MUST NEVER BE DISCONNECTED FROM
THE OUTPUT. IF THE SENSE LEADS ARE ALLOWED TO FLOAT
FREE OF THE OUTPUT, THE OUTPUT VOLTAGE WILL RISE TO
THE OVERVOLTAGE POINT AND THE UNIT WILL SHUT DOWN.

•

FOR REMOTE SENSING CONNECT THE SENSE TERMI­NALS TO THE LOAD AS SHOWN, AND REMOVE THE TWO
SENSING LINKS.

•

FOR LOCAL SENSING LEAVE THE SENSING LINKS IN
PLACE AND CONNECT THE LOAD DIRECTLY TO THE BUS
BAR.

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FIGURE 3. SIMPLIFIED VIEW, COVER REMOVED FIGURE 4. OUTLINE DRAWING, RAX 300W SERIES

NOTES: 1. Dimensions in parentheses are in millimeters, others are in inches.

captive flat and lock washer, KEPCO P/N 501-0058.

Polybutylene Terephthalate (black).

5. MATERIAL AND FINISH: A) Case is aluminum, phosphate coated; B) Terminal Block is

6. WEIGHT: 5.5 lbs (2.5Kg.) max., 4.9lbs. (2.2 Kg) typ.

2. TOLERANCES: ; ±0.04” (±1.0 mm) unless specified.

3. MOUNTING SCREW PENETRATION: 0.028” (7 mm) maximum.

4. TERMINAL BLOCK: 9 Terminals. KEPCO P/N/ 567-0017. Terminal screws: M4X6BN with

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3041172

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