KEPCO 3.3-70K User manual

©2010, KEPCO, INC 1
Data subject to change without notice 228-1672 REV 2
KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]
http://www.kepcopower.com  email: [email protected]
QUICK START GUIDE
KEPCO An ISO 9001 Company.
RKW
Programmable
SINGLE OUTPUT
PROGAMMABLE POWER SUPPLIES
I — INTRODUCTION
SCOPE OF MANUAL. This Quick Start Guide covers
the installation and operation of the Kepco RKW Series of
PFC (Power Factor Corrected), RoHS (Reduction of Haz-
ardous Substances) compliant, programmable switching
power supplies. Full specifications are listed in the applica-
ble Operator’s Manual that can be downloaded from the
Kepco web site:
• 300W: www.kepcopower.com/support/
opmanls.htm#rkw300
• 600W: www.kepcopower.com/support/
opmanls.htm#rkw600
• 1500W: www.kepcopower.com/support/
opmanls.htm#rkw1500
DESCRIPTION. The Kepco RKW Programmable Series
switching power supplies come in 300W, 600W and 1500W
sizes (see Table 1). Each size has 3.3V, 5V, 12V, 15V, 24V,
28V and 48V models.
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 fre-
quency range 47-66Hz). They will also operate on 110V to
370V d-c input. Overvoltage, overcurrent, overtemperature,
fan failure and power failure protections and an isolated
remote TTL ON-OFF control are provided for all models.
An LED “output voltage ON” light and an output voltage
adjust trimmer are provided.
II — INSTALLATION
MOUNTING THE POWER SUPPLY: Refer to Figure
1. The unit may be mounted on one mounting surface. Note
the restrictions for maximum penetration of mounting
screws (M4): 0.24 in (6 mm) from case. The air surrounding
the power supply must not exceed the ambient values
given in the graph in Figure 4.
CONNECTIONS: Figure 2 shows proper connection of
one or more loads using either remote or local sensing. If
local or remote sensing is not configured, the unit will
not work properly. The unit is shipped with local sense
cables in place for Local sensing. For remote sensing,
remove the local sense cables and connect the +S and –S
terminals to the load. Remote sensing compensation is up
to 0.4V per load wire (0.15V for 3.3V models, 0.25V for 5V
models). Transient recovery specs may not be met when
remote sensing is used. If oscillations set off overvoltage
protection, install one electrolytic capacitor (470µF min)
between +S and + and one between – and –S terminals.
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 3). Sensing (either Local or Remote) MUST be
used.
TABLE 1. RKW OUTPUT RATINGS
Series Rating 3.3V 5V 12V 15V 24V 28V 48V
RKW
300W
Model 3.3-70K 5-60K 12-27K 15-22K 24-14K 28-12K 48-7K
Output Current (Amperes d-c) 70A 60A 27A 22A 14A 12A 7A
Adjustment Range (Volts d-c) 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
RKW
600W
Model 3.3-150K 5-120K 12-53K 15-43K 24-27K 28-23K 48-13K
Output Current (Amperes d-c) 150A 120A 53A 43A 27A 23A 13A
Adjustment Range (Volts d-c) 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
RKW
1500W
Model 3.3-375K 5-300K 12-125K 15-100K 24-65K 28-55K 48-32K
Output Current (Amperes d-c) 375A 300A 125A 100A 65A 55A 32A
Adjustment Range (Volts d-c) 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

2228-1672 REV 2 072210
KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]
http://www.kepcopower.com  email: [e-mail]
FIGURE 1. POWER SUPPLY MOUNTING
FIGURE 2. LOAD CONNECTIONS
3043386
300W
600W
1500W
NOTE:
MAINTAIN A 1.25 IN. [30 MM] DISTANCE
(2.0 IN. [50MM] FOR 600W) BETWEEN
VENTILATION HOLES, FAN SURFACE
AND SURROUNDING EQUIPMENT AND
INSTALL SO AS TO PROVIDE
ADEQUATE HEAT EXCHANGE TO
OUTSIDE AIR.
STANDARD MOUNTING
SIGNAL TERMINALS:
KEY:
AC INPUT TERMINALS:
DC OUTPUT TERMINALS/BUS: OR

KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]
http://www.kepcopower.com  email: [email protected]
072210 228-1672 REV 2 3
III — OPERATION
When output voltage is available, the green LED is on. The
Output Voltage Adjust trimmer (see Figure 3) allows adjust-
ment of the output voltage.
REMOTE ON-OFF CONTROL: When remote ON/OFF
is not in use, ±RC terminals must be shorted (use shorting
link supplied) for unit to operate. Remove short across ±RC
and apply "high," 2.4V to 24V (or open), across ±RC to turn
unit OFF (Fan Off). Apply "low," 0.0V to 0.4V (or closed)
across ±RC to turn unit ON. Source current is 1.6mA maxi-
mum 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.
REMOTE VOLTAGE PROGRAMMING: In addition
to the integral trimmer, output voltage can be also be
adjusted via an external variable resistance or external
variable d-c voltage. Refer to the Operator’s Manuals listed
on page 1 for details.
PARALLEL OR SERIES OPERATION: Power Sup-
plies can be connected in parallel (with or without N+1
redundancy) for increased current or in series for increased
voltage. Refer to Operator’s Manual listed on page 1 for
details.
PRELIMINARY ELECTRICAL CHECK To verify
power supply functionality, refer to Operator’s Manual listed
on page 1.
FIGURE 3. COMPONENT LOCATIONS
KEY:
1. Frame Ground (earth)
2. AC Input: L (Line), N (Neutral)
3. DC Output (+, –)
4. ± Sense
5. REF (Output Voltage Reference)
6. RV (Remote Voltage)
7. CB (Current Balance)
8. ±PF (Power Fail)
9. ±RC (Remote ON-OFF Control)
10. Vadj (Output Voltage Trim Adjustment
11. ON (Output Voltage ON LED)
12. Local Sense Cable (connects + to +S and - to -S)
13. ±M [1500W only] Output voltage monitor terminals
Units are shipped with links between ±RC, REF to RV and
local sensing enabled: cables (300W and 600W) and links

4228-1672 REV 2 072210
KEPCO, INC.  131-38 SANFORD AVENUE  FLUSHING, NY. 11355 U.S.A.  TEL [phone]  FAX [phone]
http://www.kepcopower.com  email: [e-mail]
FIGURE 4. OUTPUT POWER VS. TEMPERATURE