KEPCO RTW 300W User Manual
OPERATOR’S MANUAL
RTW 300W SERIES
POWER SUPPLY
SINGLE OUTPUT, UNIVERSAL INPUT
KEPCO INC.
An ISO 9001 Company.
IMPORTANT NOTES:
1) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
2) Data subject to change without notice.
SINGLE PHASE, 0.99 POWER FACTOR
MODEL
RTW 300W SERIES
POWER SUPPLY MODELS
RTW 3.3-70KC, RTW 5-60KC, RTW 12-25KC,
RTW 15-20KC, RTW 24-13KC, RTW 28-11KC,
RTW 48-6.5KC
KEPCO®
©2012, KEPCO, INC
P/N 228-1544R4
KEPCO, INC. ! 131-38 SANFORD AVENUE ! FLUSHING, NY. 11355 U.S.A. ! TEL (718) 461-7000 ! FAX (718) 767-1102
email: hq@kepcopower.com ! World Wide Web: http://www.kepcopower.com
THE POWER SUPPLIER™
TABLE OF CONTENTS
SECTION PAGE
1. Introduction........................................................................................................................................................ 1
1.1 Scope of Manual............................................................................................................................................. 1
1.2 Description...................................................................................................................................................... 1
2. Specifications .................................................................................................................................................... 1
3. Installation ......................................................................................................................................................... 1
4. Operation........................................................................................................................................................... 5
4.1 Voltage Adjustment......................................................................................................................................... 7
4.2 Remote Voltage Control ................................................................................................................................. 7
4.3 Remote Turn On-Turn Off............................................................................................................................... 7
5. Alarm Functions................................................................................................................................................. 8
5.1 Overvoltage Protection ................................................................................................................................... 8
5.2 Current Limit ................................................................................................................................................... 8
5.3 Optical Coupler Output Alarm Circuit.............................................................................................................. 8
5.4 Undervoltage .................................................................................................................................................. 8
6. Load Connection ............................................................................................................................................... 8
6.1 Connecting the Load Using Local Sensing..................................................................................................... 8
6.2 Connecting the Load Using Remote Sensing................................................................................................. 8
6.3 Parallel Connection......................................................................................................................................... 9
6.3.1 Current Balancing...................................................................................................................................... 10
6.3.2 Master-Slave Configurations...................................................................................................................... 10
6.3.2.1 Master-Slave, Multiple Loads.................................................................................................................. 10
6.3.2.2 Master-Slave, Single Load...................................................................................................................... 11
6.4 Series Connection ........................................................................................................................................ 11
6.5 Preliminary Electrical Check......................................................................................................................... 12
6.6 Accessories .................................................................................................................................................. 12
LIST OF FIGURES
FIGURE TITLE PAGE
1 Mechanical Outline Drawing of the RTW 300W Power Supply (Cover Removed) .................................... 4
2 Power Rating vs. Temperature .................................................................................................................. 5
3 Mounting Positions for the RTW 300W Power Supply ............................................................................... 5
4 Locations of Operating Controls, Indicators and Terminals ....................................................................... 6
5 Connections for Remote Voltage Control................................................................................................... 7
6 Output Alarm Circuit, Optically Isolated ..................................................................................................... 8
7 Correct and Incorrect Methods of Load Connection .................................................................................. 9
8 Parallel Connection with Current Balancing............................................................................................. 10
9 Parallel Connection, Master-Slave, Multiple Loads.................................................................................. 10
10 Parallel Connection, Master-Slave, Single Load ...................................................................................... 11
11 Series Connection.................................................................................................................................... 11
12 Functional Checkout ................................................................................................................................ 12
LIST OF TABLES
TABLE TITLE PAGE
1 Output Ratings and Specifications ............................................................................................................. 1
2 Power Supply Ratings and Specifications .................................................................................................. 2
3 Function of Controls, Indicators and Terminals .......................................................................................... 6
4 Mating Connectors .....................................................................................................................................7
i RTW 300W 101212
1. INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco RTW 300W Series of
Switching Power Supplies. For service information, write directly to: Kepco Inc., 131-38 Sanford
Avenue, Flushing, New York, 11355, U.S.A. Please state Model Designation and Serial Number of
your RTW Power Supply. This information can be found on the nameplate of the unit.
1.2 DESCRIPTION
The Kepco RTW 300W Series consists of seven models of switching power supplies, each 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 (input frequency range 47-66Hz; units also operate
up to 440Hz although leakage current, power factor and efficiency specifications may not be met).
They will also operate on 110V to 370V d-c input. The RTW 300W Series employs a forward converter operating at 140 KHz. Regulation is provided by pulse width modulation. A power stage
with a MOSFET on each side of the primary winding, operating in the forward mode provides a
smooth isolated d-c output. A thyristor circuit prevents excessive turn-on current surge. A boost
converter operating at about 90KHz provides Power Factor Correction (PFC). Overvoltage protection, an isolated remote TTL ON-OFF control, an LED “output voltage ON” light and an output voltage adjust trimmer are provided. RTW 300W are low-profile convection-cooled units,
manufactured on an aluminum frame. Models with suffix KC include a cover; for applications
where a cover is not needed, contact Kepco for further information.
2. SPECIFICATIONS
Table 1 contains specifications and operating limits of individual RTW 300W Series models. Table
2 contains specifications and operating limits common to all RTW 300W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
3. INSTALLATION
Refer to Figures 1 and 3.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS
MODEL RTW 300W 3.3-70KC 5-60KC 12-25KC 15-20KC 24-13KC 28-11KC 48-6.5KC
Output Volts d-c
Adjustment Range (Volts) 1.8 - 3.6 3.5 - 5.6 7.2 - 14.4 10.5 - 18.0 16.8 - 26.4 19.6 - 33.6 33.6 - 55.0
Voltage Setting (Volts) 3.3 ±0.03 5 ±0.05 12 ±0.12 15 ±0.15 24 ±0.24 28 ±0.28 48 ±0.48
Maximum Output Rating (Watts) 231 300 300 300 312 308 312
Output Current (max.) (Amps)
Current Limit Setting (Amps)
Current Short Circuit (Amps) 87 78 36 29 25 17.5 11.5
OVP Setting (Volts)
Undervoltage
Protection
Efficiency
% typical
Ripple &
Noise
(mV, p-p)
Acceptable Output Capacitor (µF)
(1) Square type.
(2) When overvoltage is detected, output is shut OFF. Recovery is by removing and reapplying power after about 30 seconds or by
opening and reclosing the ±RC pins of connector CN 2 or CN3
(3) Ripple and noise specifications are 1.5 times indicated values for temperature range of -10 to 0°C. Ripple and noise levels
above are satisfied when conditions are 0 to 100% load, 0 to 50°C (for 50 to 71°C see Figure 2), and bandwidth ≤ 100MHz.
(4) When output falls below rated output by the percent listed, for the time listed, output is shut OFF. Recovery is by removing and
reapplying power or by opening and reclosing the ±RC pins of connector CN 2 or CN3.
(5) Minimum output current is 0 Amps.
(6) Start-up time will change if this capacitor is added.
(4)
(3)
(5)
(1)
(2)
% Output 60 60 20 20 20 20 20
Time (Sec) 3 3 15 15 15 15 15
AC Input 100V 83 84 83 85 85 85 86
AC Input 200V 86 87 86 88 88 88 89
Ripple 80 80 100 100 150 150 200
Ripple noise 120 120 150 150 200 200 300
3.3V 5V 12V 15V 24V 28V 48V
70 60 25 20 13 11 6.5
73.5 - 84 63 - 72 26.3 - 30 21 - 24 13.7 - 15.6 11.5 - 13.2 6.8 - 7.8
4.0 - 4.6 6.2 - 7.0 14.8 - 16.8 18.6 - 21.0 29.8 - 33.6 34.7 - 39.2 55.5 - 59.9
(6)
10,000 10,000 10,000 10,000 10,000 10,000 10,000
RTW 300W 101212 1
TABLE 2. POWER SUPPLY RATINGS AND SPECIFICATIONS
SPECIFICATION DESCRIPTION
Input Voltage Nominal:
Range:
Input Source Frequency Nominal:
Range:
Input Current: (Maximum Load At
25°C with Nominal Output Voltage)
Input Protection A limiting resistor in series with a resistor fuse (in parallel with a thyristor circuit) reduces start-
Input Surge cold start,
interval > 30 Sec
Leakage Current: 0.3mA typ., 0.5mA max. 100V a-c, 60Hz (per Den-An)
Power Factor 0.99 typical 100V a-c
Stabilization Typical Maximum
Remote Error Sensing: Compensation up to 0.4 Volts per load wire (0.15 Volts for 3.3V model, 0.25 Volts for 5V
Transient Recovery
characteristic
Start-up Time 220 mSec typical,
(1)
100 to 120V a-c, 200 to 240V a-c
85-265V a-c
110-370V d-c Polarity insensitive. (0 to 100% load, -10 to 71°C, derated
50-to 60 Hz
47-440 Hz.
4A rms max.
(3.6A rms max for the 3.3V model,
6A rms typ. for 24V model)
2A rms max.
(1.8A rms max for the 3.3V model,
3A rms typ. for 24V model)
up surge. Units are protected against shorts by an input fuse. Fuse value 10.0A at 250 Volts
(Littelfuse P/N 0215010.MXF4P, Kepco P/N 541-0144).
15A typ., 20A max. first surge 100 - 120V ac
30A typ., 40 max. first surge 200- 240 V ac
0.4mA typ., 0.7mA max. 240V a-c, 60Hz (per IEC 950 and UL1950)
0.93 typical 240V a-c
Source Effect (min - max) (85 to
132 V a-c, 170 to 265V a-c)
Load Effect, measured at sensing
terminals (0%-100% load change)
Temperature Effect (–10° to 71°C) 0.5% 1.0%
Combined Effect (Source, Load
and Temperature)
Drift (from 1/2 to 8 hours at 25°C) 0.2% 0.5%
model) (see Figure 7). Transient recovery specs may not be satisfied if remote sensing used.
excursion ±4% maximum 50% to 100% rated output
recovery time
350 mSec maximum
120 mSec typical,
200 mSec maximum.
0 to 100% load, -10 to 71°C. Output power derated to 90%
of max. for input voltage between 85 and 90V a-c when
mounting positions B or C are used (see Figure 3).
CAUTION: Operation with input voltage outside specified
range may damage unit.
per Figure 2.) Safety ratings apply for a-c input operation
only.
Units operate up to 440 Hz, however the leakage current
exceeds the UL leakage safety specification limit, and
power factor and efficiency specifications may not be met.
100 - 120V a-c
200 - 240V a-c
0.1% 0.2%
0.2% 0.4%
±0.9% ±1.8%
1 mS maximum
100V a-c
240V a-c
current;
transient time >50
µSec
(1) First surge only, not including current flow into EMI filter
2 RTW 300W 101212
TABLE 2. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
SPECIFICATION DESCRIPTION
Output Hold-up Time 30 mSec typ. (25 mSec typ. for 5V
and 15V models), 20 mSec min.
40 mSec typ. (30 mSec typ. for 5V
and 15V models), 25 mSec min.
Overvoltage Protection When the Power Supply goes into an overvoltage condition, the output is cut OFF. To restart
(reset) the unit, it is necessary to remove, then reconnect the a-c input power after about 30
seconds, or to open and then reclose the RC terminals.
Remote Control ON/OFF: "High", 2.4V to 24V (or open), unit OFF- Fan Off ; "Low", 0.0V to 0.4V (or closed), unit ON.
When remote ON/OFF is not in use, ±RC pins of connector CN2 or CN3 should be shorted
(use connector supplied) for unit to operate.
Operating Temperature: -10 to 71°C (see figures 2 and 3)
Startup Temperature -20 to -10°C (see Figure 2)
Storage Temperature: -30°C to +75°C
Humidity: 10% to 95% relative humidity, noncondensing, Wet Bulb tem-
perature </=35°C
Vibration: 5-10 Hz., 10mm amplitude,
10-200 Hz., acceleration 64.3ft./s
Shock: Acceleration: 1929.1ft./s
2
(588m/s2 ) (60g),
Pulse Duration: 11ms ± 5 mSec
Withstanding voltage : (at 15-35°C
ambient, 10-85% relative humidity)
2000Va-c for 1 minute. Cutout current is 10mA Between input and ground
500Va-c for 1 minute. Cutout current is 40mA Between output and ground
3000Va-c for 1 minute. Cutout current is 10mA Between input and output
Insulation Resistance: (at 15-35°C
ambient, 10-85% relative humidity)
Between output and ground, input and ground, and input and output, 100 Megohms minimum
(500Vdc)
Safety: UL60950-1 First Ed., CSA Electrical Bulletin 22.2 No.60950-1, and TÜV Rheinland
EN60950-1:2001, Assistance for Den-AN
CE marked per the Low Voltage Directive (LVD), 73/23/EEC and 93/68/EEC. The standards do
not apply with DC input operation
EMI Conducted: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EMI Radiated: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
ESD immunity: Designed to meet EN61000-4-2, level 4 normal operation
Electrical fast transient burst: EN61000-4-4 level 3 normal operation
Surge withstand: EN61000-4-5, level 4 no damage
Power Frequency Magnetic Field: EN61000-4-8, level 4 normal operation
Radiated susceptibility: EN61000-4-3 level 3 normal operation
Conducted susceptibility: EN61000-4-6 level 3 normal operation
Voltage dips interruptions and
EN61000-4-11 normal operation
variations
Input harmonics current: Designed to meet EN61000-3-2
Dimensions: 4.72 in. (120 mm) H x 1.57 in. (40 mm) W x 9.84 in. (250 mm) L
Mounting: Four No. M4 tapped holes on the sides and the bottom
Maximum Screw Penetration: 0.24 in. (6 mm)
Cooling: Convection
Frame Material Aluminum
Weight 2.87 lbs. (1.3Kg) maximum
(2) Meets the creepage and clearance requirement of Den-An Appendix 8 (100V a-c only).
100V a-c
240V a-c
2
( 19.6m/s2) (2g)
(2)
(ambient temp.50°C max.). RTW 300W units are
operating and non-operating
non-operating, 1 hr. on each
of 3 axes, sweep time 10 minutes
(non-operating, 1/2 sine
pulse, three shocks on each
axis)
RTW 300W 101212 3
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