OPERATOR’S MANUAL
RKW 1500W 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
RKW 1500W SERIES
POWER SUPPLY MODELS
RKW 3.3-375K, RKW 5-300K, RKW 12-125K,
RKW 15-100K, RKW 24-65K, RKW 28-55K,
RKW 48-32K
KEPCO®
©2010, KEPCO, INC
P/N 228-1503-REV 5
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. Optical Coupler Output Alarm Circuit ........................................................................................................... 5
4. Operation........................................................................................................................................................... 6
4.1 Voltage Adjustment ........................................................................................................................................ 7
4.2 Remote Voltage Control ................................................................................................................................. 8
4.3 Remote Turn On-Turn Off............................................................................................................................... 8
5. Alarm Functions................................................................................................................................................. 8
5.1 Overvoltage And Overtemperature Protection................................................................................................ 8
5.2 Overcurrent Protection ................................................................................................................................... 9
5.3 Fan Failure ..................................................................................................................................................... 9
5.4 Undervoltage .................................................................................................................................................. 9
6. Load Connection ............................................................................................................................................... 9
6.1 Connecting The Load Using Local Sensing................................................................................................... 9
6.2 Connecting The Load Using Remote Sensing................................................................................................ 9
6.3 Parallel Connection ...................................................................................................................................... 10
6.4 Series Connection ........................................................................................................................................ 12
6.5 Preliminary Electrical Check......................................................................................................................... 12
7. Fan Maintenance............................................................................................................................................. 13
LIST OF FIGURES
FIGURE TITLE PAGE
1 Mechanical Outline Drawing Of The RKW 1500W Power Supply............................................................ 4
2 Output Alarm Circuit Optically Isolated....................................................................................................... 5
3 RKW 1500W Power Failure Timing Diagram ............................................................................................. 5
4 Power Rating Vs. Temperature.................................................................................................................. 6
5 Mounting Positions For The RKW 1500W Power Supply .......................................................................... 6
6 Locations Of Operating Controls, Indicators and Terminals....................................................................... 7
7 Connections For Remote Voltage Control.................................................................................................. 8
8 Correct and incorrect Methods of Load Connection................................................................................. 10
9 Parallel Connection with Current Balancing ............................................................................................. 10
10 Parallel Connection, Master-Slave, Multiple Loads.................................................................................. 11
11 Parallel Connection, Master-Slave, Single Load ...................................................................................... 11
12 Series Connection.................................................................................................................................... 12
13 Functional Checkout................................................................................................................................. 13
LIST OF TABLES
TABLE TITLE PAGE
1 Output Ratings and Specifications ............................................................................................................. 1
2 Power Supply Ratings and Specifications .................................................................................................. 2
i 228-1503 REV 2 060110
1. INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco RKW 1500W Series of
PFC (Power Factor Corrected), RoHS (Reduction of Hazardous Substances) compliant, 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
RKW Power Supply. This information can be found on the nameplate of the unit.
1.2 DESCRIPTION
The Kepco RKW 1500W 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). They will also
operate on 110V to 370V d-c input. The RKW 1500W Series employs a light weight ferrite core
with a switching frequency of about 140 KHz (about 100 KHz for the 3.3 volt model). Regulation is
provided by pulse width modulation. A power stage with two MOSFETS 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. Overvoltage, overcurrent, undervoltage,
overtemperature and fan failure protections, an isolated remote TTL ON-OFF control, a power fail
signal and current balancing (for parallel operation) are provided. An LED “output voltage ON”
light and an output voltage adjust trimmer are visible near the output bus bars (right side of the
case). Units are manufactured on a steel frame with a steel cover.
2. SPECIFICATIONS
Table 1 contains specifications and operating limits of individual RKW 1500W Series models.
Table 2 contains specifications and operating limits common to all RKW 1500W Series Models.
These specifications are at nominal input voltages at 25°C unless otherwise specified.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS
MODEL RKW 1500W 3.3-375K 5-300K 12-125K 15-100K 24-65K 28-55K 48-32K
Output Volts d-c
Adjustment Range 1.8-3.6 3.5-6.0 7.2-14.4 10.5-18.0 16.8-28.8 19.6-33.6 33.6-52.8
Voltage Setting 3.3 ±0.03 5 ±0.05 12 ±0.12 15 ±0.15 24 ±0.24 28 ±0.28 48 ±0.48
Maximum
Output
Ratings
(A,W)
Overcurrent Setting (Amps)
Current Short Circuit 430 350 152 135 80 70 45
OVP Setting (Volts)
Efficiency
% typical
Ripple &
(3)
Noise
(mV, p-p)
(1) Square type. If overcurrent condition continues for approximately 30 seconds, the output is shut OFF. Recovery is by
removing power and reapplying power after about 40 seconds or by opening and reclosing the RC terminals .
(2) When overvoltage is detected, output is shut OFF. Recovery is by removing power and reapplying power after about 40
seconds or by opening and reclosing the RC terminals (no delay).
(3) Ripple and noise specifications is 1.5 times the indicated values for a temperature range of -10 to 0°C. Ripple and noise
levels above are satisfied when conditions are 0 to 100% load, 0 to 65°C, and bandwith </= 100MHz.
–10°C to
40°C
50°C
amb
60°C,
amb
65°C,
amb
AC Input 100V 73 77 80 82 82 82 84
AC Input 200V 77 82 84 86 86 86 88
ripple 100 100 150 150 200 200 300
ripple noise
Amps 375 300 125 100 65 55 32
Watts 1237.5 1500 1500 1500 1560 1540 1536
Amps 346.88 300 125 100 65 55 32
Watts 1144.69 1500 1500 1500 1560 1540 1536
Amps 300 240 100 80 52 44 25.6
Watts 990 1200 1200 1200 1248 1232 1228.8
Amps 262.5 210 87.5 70 45.5 38.5 22.4
Watts 866.25 1050 1050 1050 1092 1078 1075.2
(1)
(2)
3.3V 5V 12V 15V 24V 28V 48V
390-430 315-350 130-140 105-115 68-72 57.7-63.2 33.6-36.8
4.0 - 4.6 6.2 - 7.0 14.8 - 16.8 18.6 - 21.0 29.8 - 33.6 34.7 - 39.2 55.0 - 59.9
200 200 200 200 300 300 400
228-1503 REV 4 060110 1
TABLE 2. POWER SUPPLY RATINGS AND SPECIFICATIONS
SPECIFICATION DESCRIPTION
Input Voltage 85-265V a-c (0 to 100% load, -10 to 65°C)
110-370V d-c Polarity insensitive (0 to 100% load, -10 to 65°C) Safety
agency approval applies only to a-c input operation.
Input Source Frequency 50-to 60 Hz 47-440 Hz. (At 440 Hz the leakage current exceeds the
UL leakage safety specification limit).
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: 0.5mA typ., 0.8mA max. at 120V a-c, 60Hz (per IEC 950 and UL1950)
Power Factor 0.99 typical 100 - 120V a-c, rated output
Stabilization Typical Maximum
Remote Error Sensing: Compensation up to 0.4 Volts per load wire (0.15 Volts for RKW 3-375, 0.25 Volts for RKW
Transient Recovery
characteristic
Start-up Time 500 msec maximum, 280 msec
Output Hold-up Time 35 msec typical, 20 msec mini-
Thermal Protection When the Power Supply goes into thermal protection, the output is cut OFF. To restart (reset)
(1)
22A rms max. (18A rms max for the 3.3V model)
11A rms max. (9A rms max for the 3.3V model)
up surge. Units are protected against shorts by an input fuse. Fuse value 30.0A At 250 Volts
15A typ., 20A max. first surge 100 - 120V ac
30A typ., 40 max. first surge 200- 240 V ac
1.1mA typ., 1.6mA max. at 240V a-c, 60Hz (per IEC 950 and UL1950)
0.95 typical 200 - 240V a-c, rated output
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 65°C) 0.5% 1.0%
Combined Effect (envelope,
Source, Load and Temperature)
Drift (8 hours at 25°C) 0.2% 0.5%
5-300K) (see Figure 8).
excursion ±4% maximum 50% to 100% load,
recovery time 1 ms maximum
typical.
400 msec maximum, 180 msec
typical.
mum.
40 msec typical, 20 msec minimum.
the unit after it has cooled, it is necessary to remove the a-c input power, wait about 40 seconds, and then to reconnect the a-c input power or to open and then reclose the RC terminals.
(0.15% for 3.3V Model)
(0.45% for 3.3V Model)
(±1.1% for 3.3V Model)
0.1%
0.3%
±0.9%
100V a-c
240V a-c
100V a-c
240V a-c
100 - 120V a-c
200 - 240V a-c
0.2%
(0.3% for 3.3V Model)
0.6%
(0.9% for 3.3V Model)
±1.8%
(±2.2% for 3.3V Model)
transient time >50
µsec
(1) First surge only, not including current flow into EMI filter
2 228-1503 REV 4 060110
TABLE 2. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
SPECIFICATION DESCRIPTION
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.
Operating Temperature: -10 to 65°C (see Figure 4)
Startup Temperature -20 to -10°C (see Figure 4)
Storage Temperature: -30°C to +75°C
Withstanding voltage : (at 15-35°C
ambient, 10-85% relative humidity)
Insulation Resistance: (at 15-35°C
ambient, 10-85% relative humidity)
Humidity: 10% to 95% relative humidity, noncondensing, Wet Bulb tem-
Vibration: 5-10 Hz., 10mm amplitude,
Shock:
(non-operating, 1/2 sine pulse,
three shocks on each axis, Power
Supply is fixed on its bottom side)
Safety: All units designed to meet UL1950, CSA Electrical Bulletin 22.2 No.950-95 (certified by UL),
EMI Conducted: Designed to meet FCC Class A, VCCI-Class A, EN55011-A, EN55022-A.
EMI Radiated: Designed to meet FCC Class A, VCCI-Class A, EN55011-A, EN55022-A
Input current harmonics: Designed to meet EN61000-3-2.
Immunity: Designed to meet EN50082-2.
ESD immunity: EN61000-4-2, level 4 normal operation
Fast transient burst immunity: EN61000-4-4 level 3 normal operation
Surge immunity: EN61000-4-5, level 4 no damage
Power Frequency Magnetic Field
immunity:
Radiated field immunity: EN61000-4-3 level 3 normal operation
Conducted noise immunity: EN61000-4-6 level 3 normal operation
Voltage dips interruptions and
variations
Dimensions: 3.62 in. (92 mm) x 7.48 in. (190 mm) x 11.81 in. (300 mm)
Mounting: Four No. M4 tapped holes on the sides and the bottom
Maximum Screw Penetration: 0.24 in. (6 mm)
Cooling: Forced air flow - two fans
Frame Material/Cover Material: Steel
Weight 13.2 lbs, 6.0Kgs. maximum
Source current is 1.6mA maximum at low level, and sink current is 1.0 mA maximum at high
level. The ±RC terminals are isolated from the a-c input terminal and the DC output terminals.
When remote ON/OFF is not in use, ±RC terminals must be shorted (use shorting link supplied) for unit to operate.
2000Va-c for 1 minute. Cutout current is 20mA Between input and ground
500Va-c for 1 minute. Cutout current is 300mA Between output and ground
3000Va-c for 1 minute. Cutout current is 20mA Between input and output
terminal
Between output and ground, input and ground, and input and output, 100 Megohms minimum
(500Vdc)
operating and non-operating
perature</=35°C
non-operating 1 hr. on each
of 3 axes, sweep time 10
10-200 Hz., acceleration 64.3ft./s
2
( 19.6m/s2) (2g)
minutes
Acceleration: 964.6ft./s
2
(294m/s2 ) (30g),
Pulse Duration: 11ms ± 5 msec
and TÜV Rheinland EN60950 (ambient temp. 50°C max., 3.3V Model: 40°C max.). RKW
1500W units are CE marked per the Low Voltage Directive (LVD), 73/23/EEC and 93/68/EEC.
[The standards do not apply with DC input operation.]
With filter P/N 245-0031: FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
With filter P/N 245-0031: FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EN61000-4-8, level 4 normal operation
EN61000-4-11 normal operation
228-1503 REV 4 060110 3
FIGURE 1. MECHANICAL OUTLINE DRAWING OF THE RKW 1500W POWER SUPPLY
3. OPTICAL COUPLER OUTPUT ALARM CIRCUIT
When the output voltage falls to less than about 80 percent of programmed output voltage the
alarm is activated (a high logic level will appear at the ±PF terminals). The default state of the
alarm is logic low. The sink current is 50mA maximum, the maximum collector to emitter saturation voltage is 0.40 Volts, and the collector to emitter voltage is 40 volts maximum. The PF terminals are isolated from the AC and DC output input terminals. Insulation resistance between
the PF terminals and the AC input terminals is the same as the insulation resistance between
the input and output. Insulation resistance between the PF terminals and the output terminals is
the same as the insulation resistance between the output and ground.
4 228-1503 REV 4 060110
FIGURE 2. OUTPUT ALARM CIRCUIT OPTICALLY ISOLATED
FIGURE 3. RKW 1500W POWER FAILURE TIMING DIAGRAM
The power supply will
startup from -20 to -10 °C
but may not meet the
specifications
FIGURE 4. POWER RATING VS. TEMPERATURE
228-1503 REV 4 060110 5
AC INPUT
TERMINAL
Maintain a 1.25 in. (30 mm)
min. distance between ventilation holes, fan surface
and surrounding equipment
and install to provide heatoutside air exchange
FIGURE 5. MOUNTING POSITIONS FOR THE RKW 1500W POWER SUPPLY
4. OPERATION
SIGNAL TERMINALS
DC OUTPUT
BUS
Figure 6 shows the location of all operating controls and input/output terminals; Table 3 provides
an explanation of each. The unit is shipped with shorting links installed connecting the following
terminals: +RC to –RC and REF to RV, +M with +S and –M with –S (+M, –M to +S, –S connections provide local sensing).
NOTES:
1. +S and –S MUST be properly connected for the unit to operate. For local
sensing, leave local sensing links in place (refer to PAR. 6.1). For
remote sensing (at the load), refer to PAR. 6.2.
2. If remote ON/OFF is not being used, ±RC terminals must be connected
(use shorting link supplied) for unit to operate.
4.1 VOLTAGE ADJUSTMENT
Output voltage can be manually adjusted with the voltage adjustment control, Vadj (see Figure 6).
To adjust voltage, first place the unit under an operating load, then monitor the (+)S and (–)S
Sense terminals with a precision voltmeter and turn the voltage control to the desired operating
value. Refer to Table 1 for the recommended Adjustment Range of all the RKW 1500W Models.
4.2 REMOTE VOLTAGE CONTROL
The unit is shipped with a shorting link in place between RV and REF terminals. Removal of this
link allows the output voltage to be adjusted by either a trimmer pot (resistance) or by an external
variable voltage source across the RV terminal and –S terminal.
NOTE: Specifications are met when voltage is within adjustment range in Table 1. If remote
voltage control is not implemented, the shorting link between RV and REF must be in
place.
Use either local sensing (PAR. 6.1) or remote sensing (PAR. 6.2). It is possible that the overvoltage protection may be triggered if the output voltage is manually (using RV control) decreased to a
6 228-1503 REV 4 060110
low level very quickly when the power supply is at a low load condition. Remote sensing cannot be
used for parallel operation, series operation and for remote voltage control.
RESISTANCE: Use a shielded wire 6.6 feet (2m) maximum in length, for connection (of REF, RV,
and –S terminals) to the trimmer control. Connect the external trimmer as shown in Figure 7 (A).
Suggested value for the trimmer control is 5K ohms). With the external trimmer control at its maximum clockwise position, set the output voltage to the desired maximum value by adjusting Vadj
clockwise. The value should range from 0 to 120% of Eo nominal (from 0 to 110% for the 48-volt
NOTE Unit is shipped with shorting links
(not shown) connecting +RC to –RC (see
PAR. 4.3) and REF to RV (see PAR. 4.2)
and with local sensing links installed (connects +M to +S and –M to –S) (see PAR.
6.1). See PAR. 6.2 for remote sensing.
FIGURE 6. LOCATIONS OF OPERATING CONTROLS, INDICATORS AND TERMINALS
TABLE 3. FUNCTION OF CONTROLS, INDICATORS AND TERMINALS
FIG. 6
INDEX
NO.
1 Frame Ground (earth) Connect to earth ground. This terminal is connected to the case.
2 A-C Input (L, N) Connect to AC: 100 to 240V input line.
3 D-C Output (+, –) Connect to load (see Figure 8).
4 Sense (+S, –S) Used to compensate for voltage drop in the connecting lines from the output ter-
5 +M, –M Output Voltage Monitor Used to connect output measurement device. Normallly connected to sense ter-
6 Output Voltage Reference (REF) Using REF terminal (together with the RV terminal) allows all the output voltages
7 Output Voltage Adjust (RV) This terminal (together with the REF terminal) is used for remotely controlling
8 Current Balance (CB) This terminal is used when several power supplies are connected in parallel (see
9 Power Failure (PF) These terminals output an open logic signal if output voltage drops to 80 % or
CONTROL, INDICATOR,
TERMINAL
FUNCTION
minal to a load; they are connected to ±M terminals for local sensing (see Figure
8).
minals (S+, S–) via shorting link for local sensing
of slave power supplies to be controlled by one voltage adjustment of a master
power supply (normally connected to the RV terminal with a metal shorting link).
output voltage (see PAR. 4.2).
PAR. 6.3).
lower of a set voltage, or if output voltage is shut down due to overvoltage or
overcurrent protection, fan speed failure, or overheating. (see Figure 3).
10 Remote ON-OFF (+RC, –RC) Output is turned ON-OFF by opening-shorting the RC terminals (output OFF
when open). RC terminals are isolated from input and output terminals. Normally, ±RC terminals are shorted with a metal shorting link (see PAR. 4.3).
11 Output Voltage Trim Adjust (Vadj) Adjusts output voltage.
12 Output Voltage On indicator
(green)
228-1503 REV 4 060110 7
Green LED lights when output voltage is present.
model, and for the 3-volt model). The remote voltage control may not be able to go down to zero
volts because of the residual resistance of the potentiometer (could be about 10%).
VOLTAGE. By adjusting an external 0-6V voltage source (0-5.5V for the 48-volt model, the 3.3-volt
model can be adjusted to 3.6V) from minimum to maximum, the maximum output voltage can be
adjusted from 0 to 120% (V) (for the 48 volt models 110%). Remove the shorting link between the
REF and RV terminal. Connect the voltage source across the RV and (–)S terminals as shown in
Figure 7 (B).
AA
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
4.3 REMOTE TURN ON-TURN OFF
When power is ON at the source, the output may be turned ON or OFF with the remote control
feature using the ±RC terminals (see Figure 6). These terminals accept a logic level (2.4V to 24V
"high" and 0.0 to 0.4V "low"), or a contact closure. When the ±RC terminals are open, using either
a mechanical switch or a high level logic signal, the RKW 1500W output is cut OFF. When the RC
terminals are shorted, the output returns to within specifications. At low level logic, the maximum
source current is 1.6mA and at high level the sink current is 1.0mA. The RC terminals must
remain shorted if remote ON-OFF is not used. The RC terminals are isolated from both the AC
input and DC output terminals.
5. ALARM FUNCTIONS
B
5.1 OVERVOLTAGE AND OVERTEMPERATURE PROTECTION
When the output voltage of the RKW 1500W Power Supply increases beyond the specified values
(see Table 1), the output is cut OFF and the fan turns OFF. Overvoltage setting tracks output voltage up to maximum specified in Table 1. To restart (reset) the unit, remove AC input power, wait
about 40 seconds, then reconnect AC input power; or open the RC terminals and then reclose the
terminals.
When the internal temperature of the RKW 1500W Power Supply increases beyond the specified
values (see Table 1), the output is cut OFF and the fans turn OFF. The restart cycle (Power ON)
should not begin until the temperature returns to within specifications. To restart (reset) the unit,
remove AC input power, wait about 40 seconds, then reconnect AC input power. The power supply cannot be reset by using the remote ON-OFF feature unless the power supply is first shut
down for about 40 seconds and then turned on again.
The alarm circuit is a diode transistor optical coupler. The transistor is normally conducting. When
the alarm is activated, the transistor cuts off and the collector emitter circuit is open (see Figure 2)
5.2 OVERCURRENT PROTECTION
The output characteristic of the power supply is a square type, and the unit is set to shut down if
output current exceeds specifications (see Table 1) for more than 30 seconds. To restart (reset) the
unit, remove AC input power, wait about 40 seconds, then reconnect AC input power. or open the
RC terminals and then reclose the terminals. (see PAR. 4.3).
8 228-1503 REV 4 060110
5.3 FAN FAILURE
A cut off of the rotation supply voltage causes the output to shut down and the fans to turn OFF. Fan
failure and all the other protection circuit operations are indicated by an open circuit across the (±)
PF terminals. To restart (reset) the unit remove the AC input power, wait about 40 seconds, then
reconnect AC input power; or open the RC terminals and then reclose the terminals. If fan rotation
is out of specification the power supply will not recover
5.4 UNDERVOLTAGE
If the output voltage of the power supply falls below 80 percent of the programmed voltage the
power failure alarm will go to the high logic state. Sink current is 2ma maximum and collector
emitter voltage is 40 volts maximum. The ±P/F terminals are insulated from AC input terminals
and the DC output terminals. Insulation resistance between the ±P/F terminals and the output terminals is the same as insulation resistance from output to ground of the power supply. Insulation
resistance between the AC input terminals and ±P/F terminals is the same as insulation resistance from the input terminals to the output terminals of the power supply.
6. LOAD CONNECTION
6.1 CONNECTING THE LOAD USING LOCAL SENSING
To connect the load for local sensing, (the sensing links are installed at shipping) connect the +S
to +M terminals and –S to –M terminals. The load is connected across DC output (+) and (–) bus
bars (see Figure 8).
6.2 CONNECTING THE LOAD USING REMOTE SENSING
For remote sensing the load is connected as shown in Figure 8. Remote error sensing at the load
terminals compensates for a voltage drop in the connecting wires as indicated in Table 2. For
remote sensing, the sensing links must be removed from the +S to +M and -S to -M terminals.
NOTE: If oscillations set off the overvoltage protection, install one external electrolytic capacitor,
rated 470µF min. between the +M and +S terminals and one between the –M and –S terminals.
FIGURE 8. CORRECT AND INCORRECT METHODS OF LOAD CONNECTION
6.3 PARALLEL CONNECTION
RKW 1500W Power Supplies can be connected in parallel (with or without N+1 redundancy). Use
twisted or shielded wire for connection to RV and –S terminals. The impedance of the load wires
between each power supply and load should be the same.
228-1503 REV 4 060110 9
For a single remote ON-OFF signal to turn off all parallel-connected units, connect together all
+RC terminals and connect together all –RC terminals. Figure 9 illustrates connection of up to four
(maximum) power supplies in parallel.
N+1 Redundancy. An N+1 system requires one additional power supply than necessary to supply
the load. If one of the parallel-connected units fail, the others will continue to provide power to the
load without down time. For redundancy, add isolation diodes as shown in Figure 9.
FIGURE 9. PARALLEL CONNECTION WITH CURRENT BALANCING
6.3.1 CURRENT BALANCING
Current equalization conditons required for up to four RKW 1500W units in parallel are:
1. Output current of each power supply should be within 20 to 90% of the total output current
rating.
2. The output voltage of any Power Supply individually must be within 2% maximum of the
other power supply output voltage setting.
Maximum Voltage Minimum Voltage–
------------------------------------------------------------------------------------------------------ - 2%=
Rated Voltage
variation of output voltage in each power supply
3. The expected current sharing is such that the output current variation for each power supply
is less than or equal to 10% of each power supply rated output current.
6.3.2 MASTER-SLAVE CONFIGURATIONS
Master-slave operation allows the output voltage of all the power supplies connected in parallel to
be adjusted at the same time by using the Vadj control on the designated master power supply.
6.3.2.1 MASTER-SLAVE, MULTIPLE LOADS
Figure 10 shows the master-slave connection of three power supplies in parallel, each having an
independent load, with output voltage controlled by the Vadj control of the master power supply.
Use shielded wire (recommended) or twisted wires for connections to RV and –S terminals.
FIGURE 10. PARALLEL CONNECTION, MASTER-SLAVE, MULTIPLE LOADS
10 228-1503 REV 4 060110
6.3.2.2 MASTER-SLAVE, SINGLE LOAD
Figure 11 shows the connection of three power supplies in parallel to a single load. The output
voltage of all power supplies is controlled by Vadj of the master. Current balancing is implemented
to equalize the load current (see PAR. 6.3.2). NOTE: Use shielded wire (recommended) or twisted
wires for connections to RV and –S terminals. Match impedance of load wires between each
power supply and load by using the same wire lengths and wire sizes.
FIGURE 11. PARALLEL CONNECTION, MASTER-SLAVE, SINGLE LOAD
6.4 SERIES CONNECTION
Units may be connected in series to obtain higher voltages. 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. Each Power Supply in series should be protected by a diode connected in parallel with
the output as shown in Figure 12. The diode protects against reverse voltages. It should be rated
for typically, V
REVERSE
>/= 2 x ΣV
of the series connection, I
OUT
FORWARD
>/= 2 xI
OUT
connection).
FIGURE 12. SERIES CONNECTION
6.5 PRELIMINARY ELECTRICAL CHECK
Connect an adjustable load across the power supply output bus bars, on the right side of the
front panel (see Figure 6). The load must have a dissipation rating of at least 3000 Watts. Connect a voltmeter and an oscilloscope across the power supply monitor terminals (should be
linked to the respective sensing terminals, +S and –S). The oscilloscope must be isolated from the
source and grounded at the load. Use an isolation transformer between the test equipment and
the AC input power (see Figure 13).
of the series
Connect the AC input power to the line, neutral and ground terminals (see Figure 6). Turn source
power on and check the output voltage both with and without load. The output voltage can be
adjusted within the published range by using the front panel voltage control trimmer Vadj
228-1503 REV 4 060110 11
.
DC
FIGURE 13. FUNCTIONAL CHECKOUT
7. FAN MAINTENANCE
Under most conditions the fans requires no maintenance. Do not use the fans in an environment of
high temperature and high humidity that exceeds the temperature and humidity limits given in the
Power Supply Specifications (see Table 2). Avoid an environment where corrosive gas may be
present. If the Power Supply is used in an open or dirty area, a filter should be installed on the air
intake side of the fans to prevent the inflow of dust particles. If the Power Supply is used in briny air
care should be taken to keep the salt from entering the Power Supply.
12 228-1503 REV 4 060110
You must register your product to comply with the terms of the warranty. Either fill out the form
below and mail or fax to Kepco, or for rapid on-line registration go to:
http://www.kepcopower.com/warranty.htm
PRODUCT PURCHASED:
Model Number)______________________________________
Serial Number_______________________________________
PURCHASE INFORMATION:
Date Purchased:_____________________________________
Date Received:______________________________________
REQUEST ADDITIONAL INFORMATION
" Send complete Catalog
" Have Sales Engineer Call
Contact via: " E-Mail " Telephone " Fax " S-mail
REGISTER TO:
Registered by:________________________________________
Company Name:______________________________________
Street: ______________________________________________
City:________________________________________________
State:_______________________________________________
Country:_____________________________________________
Zip:_________________________________________________
E-mail: ______________________________________________
FAX:____________________________________________
Phone: _________________________________________
WHAT INFLUENCED YOUR CHOICE OF THIS POWER SUPPLY?
" Previous Experience (which Kepco Models do you have?)
______________________________________________________
" Kepco Catalog or Brochure?__________________________
" Sales Representative?
______________________________________________________
______________________________________________________
" Magazines (which ones?)_____________________________
______________________________________________________
" Trade Shows (which ones?)___________________________
" Directory?__________________________________________
Kepco 5 Year Warranty
This is to certify that we, KEPCO, INC., (hereinafter called “Company”), Flushing, NY
11355 USA, warrants for a period of FIVE YEARS, this instrument known as:
MODEL: __________________________________________
SERIAL NO. _________________________________________
The Company’s products are warranted for a period of five years from date of delivery to
be free from defects in materials and workmanship and to conform to the specifications
furnished or approved by the Company. Liability under this warranty shall be limited to
the repair or replacement of any defective product at Company’s option.
If any defect within this warranty appears within the warranty period, the Purchaser shall
promptly notify the Company in writing. No material will be accepted for repair or
replacement without written authorization of the Company.
" Web Site
" Other (please explain):_____________________________
What products would you like to see Kepco make?
____________________________________________________
____________________________________________________
____________________________________________________
CUT HERE
Upon such authorization, and in accordance with instructions of the Company, parts or
materials for which replacement is requested shall be returned to the Company for
examination, with shipping charges prepaid by the Purchaser. Final determination as to
whether a product is actually defective rests with the Company.
This warranty does not extend to any product which has been subjected to misuse,
neglect, accident, improper installation, or use in violation of instructions furnished by
the Company. The warranty does not extend to, or apply to, any unit which has been
repaired or altered outside of the Company’s factory by persons not expressly approved
by the Company.
THE WARRANTY HEREIN CONTAINED IS IN LIEU OF AND EXCLUDES ALL OTHER
WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, INCLUDING WITHOUT
LIMITATION THE WARRANTY OF MERCHANTABILITY.
THIS KEPCO PRODUCT IS WARRANTED FOR FIVE YEARS!
KEPCO, INC. # 131-38 SANFORD AVENUE, FLUSHING,
NY 11355 USA
MST SERIES 6/1/10 1
E-mail: hq@kepcopower.com
#
Tel. 718-461-7000 # Fax. 718-767-1102
#
URL: http://www.kepcopower.com
KEPCO, INC.
131-38 SANFORD AVE.
FLUSHING, NY 11355 USA
FOLD HERE
Please
place
stamp
here
CUT HERE
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