KEPCO RA 19-1U User manual

IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial num-
bers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Docu-
mentation Office in New York, [phone], requesting the correct revision for your par-
ticular model and serial number.
3) 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.
Data subject to change without notice.
KEPCO®
THE POWER SUPPLIER™
MODEL
INSTRUCTION MANUAL
ORDER NO. REV. NO.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL [phone] FAX [phone]
email: [e-mail] World Wide Web: www.kepcopower.com
KEPCO INC.
An ISO 9001 Company.
©2023, KEPCO, INC
P/N 243-1025-R4
RA 19-1U
RACK ADAPTER
HOT SWAP RACK ADAPTER FOR 1U HSF SERIES POWER SUPPLIES
RA 19-1U
RACK ADAPTER

RA 19-1U 041323 i
TABLE OF CONTENTS
SECTION PAGE
SECTION 1 - INTRODUCTION
1.1 Scope of Manual ..................................................................................................................................... 1-1
1.2 General Description................................................................................................................................. 1-1
1.3 Mechanical.............................................................................................................................................. 1-1
1.4 Electrical.................................................................................................................................................. 1-1
1.5 Safety...................................................................................................................................................... 1-2
1.6 RoHS Compliance................................................................................................................................... 1-2
1.7 Accessories............................................................................................................................................. 1-3
1.8 Options.................................................................................................................................................... 1-3
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection....................................................................................................................... 2-1
2.2 Configuring the Rack Adapter................................................................................................................. 2-1
2.3 Rack Adapter Keying Instructions ........................................................................................................... 2-1
2.3.1 Establishing Key Positions................................................................................................................. 2-2
2.4 Slot Configuration.................................................................................................................................... 2-2
2.4.1 Independent Operation...................................................................................................................... 2-3
2.4.1.1 Independent Operation - Local Sensing Using Rear Panel DIP switches ................................... 2-4
2.4.1.2 Independent Operation - Local Sensing Using External Wiring................................................... 2-5
2.4.1.3 Independent Operation - Remote Sensing .................................................................................. 2-6
2.4.2 Parallel Operation.............................................................................................................................. 2-7
2.4.2.1 Parallel DC OUTPUT Connections.............................................................................................. 2-7
2.4.2.2 Parallel Current Share Connections ............................................................................................ 2-7
2.4.2.2.1 Parallel Current Share - Rear Panel DIP Switches....................................................................2-8
2.4.2.2.2 Parallel Current Share - External Wiring....................................................................................2-9
2.4.2.3 Sense Connections for Parallel Configurations ........................................................................... 2-10
2.4.2.3.1 Parallel Configuration Using DIP Switches to Connect Sense Lines in
Parallel and External Wires to Configure Local Sensing........................................................2-11
2.4.2.3.2 Parallel Configurations using External Wires to Connect Sense Lines
in Parallel and External Wires to Configure Local Sensing....................................................2-12
2.4.2.3.3 Parallel Configurations using DIP Switches to Connect Sense Lines in
Parallel and External Wires to Configure Remote Sensing....................................................2-13
2.4.2.3.4 Parallel Configurations using External Wires to Connect Sense Lines
in Parallel and External Wires to Configure Remote Sensing................................................2-14
2.4.3 Series Operation................................................................................................................................ 2-15
2.4.4 Alarm Configurations......................................................................................................................... 2-17
2.4.4.1 N.O. Alarm Line (Close on Failure).............................................................................................. 2-17
2.4.4.1.1 Close on Failure Using Rear Panel Dip Switches......................................................................2-17
2.4.4.1.2 Close on Failure Using External Wiring at I/O Mating Connector..............................................2-19
2.4.4.2 N.C. Alarm Line (Open on Failure) .............................................................................................. 2-20
2.4.4.2.1 Open on Failure Using Rear Panel Dip Switches......................................................................2-20
2.4.4.2.2 Open on Failure Using External Wiring of I/O Mating Connector...............................................2-21
2.5 Current Monitoring (-1URC and -1URY Models only) ............................................................................. 2-22
2.6 Remote On-Off (-1URX and -1URY Models only)................................................................................... 2-23
2.7 Terminations............................................................................................................................................ 2-24
2.8 Cooling.................................................................................................................................................... 2-24
2.9 Installation............................................................................................................................................... 2-24
2.9.1 Installing 1U HSF Power Supplies..................................................................................................... 2-24
2.10 Wiring Instructions................................................................................................................................... 2-24

ii RA 19-1U 041323
TABLE OF CONTENTS
SECTION PAGE
2.10.1 Safety Grounding.............................................................................................................................. 2-25
2.10.2 Source Power Connections .............................................................................................................. 2-25
2.10.2.1 EMI Compliance.......................................................................................................................... 2-26
2.10.3 Control Signal Connections .............................................................................................................. 2-26
2.10.4 Output Load Connections................................................................................................................. 2-26
2.10.4.1 Reducing Ripple and Noise......................................................................................................... 2-26
2.10.4.2 Parallel/Redundant Operation..................................................................................................... 2-28
2.10.4.3 Series/Independent Operation.................................................................................................... 2-28
2.10.4.4 Mixed Operation.......................................................................................................................... 2-28
2.11 Removing/Replacing 1U HSF Power Supplies....................................................................................... 2-28
2.12 Shipping.................................................................................................................................................. 2-28

LIST OF FIGURES
FIGURE TITLE PAGE
RA 19-1U 041323 iii/(iv Blank)
1-1 RA 19-1U Rack Adapter ............................................................................................................................... vi
1-2 RA 19-1U Rack Adapter with 1U HSF Power Supplies Installed................................................................ 1-1
1-3 RA 19-1U Interconnections, Simplified Diagram......................................................................................... 1-2
1-4 RA 19-1U Rack Adapter Rear Panel .......................................................................................................... 1-3
1-5 Mechanical Outline Drawing, RA 19-1U Rack Adapter............................................................................... 1-4
1-6 RA 19-1U Schematic Diagram.................................................................................................................... 1-7
2-1 RA 19-1U Rack Adapter Keying ................................................................................................................. 2-2
2-2 Independent Operation, Local Sensing for PS1 and PS2 using
Rear Panel DIP switches, Simplified Diagram ........................................................................................ 2-4
2-3 Independent Operation, Local Sensing for PS1 and PS2 using
External Jumpers at I/O Mating Connector, Simplified Diagram............................................................. 2-5
2-4 Independent Operation, Remote Sensing for PS1 and PS2 using
External Wiring at I/O Mating Connector, Simplified Diagram................................................................. 2-6
2-5 Parallel Outputs Using Rear Panel DIP Switches to Parallel sense
lines and current share, PS1 and PS2 (Typical), Simplified Diagram..................................................... 2-8
2-6 Parallel Outputs Using External Wiring, Typical Configuration, Simplified Diagram................................... 2-9
2-7 Typical Parallel Connections Using External Wires for
Local Sensing and DIP switches to Parallel Sense Wires....................................................................... 2-11
2-8 Typical Parallel Connections using External Wires for Local Sensing
and I/O Mating Connector Jumpers to Parallel Sense Wires................................................................... 2-12
2-9 Typical Parallel Connections, Remote Sensing using DIP Switches to Parallel Sense Wires.................... 2-13
2-10 Typical Parallel Connections, Remote Sensing using I/O Mating
Connector Jumpers to Parallel Sense Wires........................................................................................... 2-14
2-11 Series Configuration, Simplified Diagram ................................................................................................... 2-16
2-12 Close on Failure Alarm Configuration Using Rear Panel Dip Switches, Simplified Diagram...................... 2-18
2-13 Close on Failure Alarm Configuration Using External Wiring at I/O Mating
Connector, Simplified Diagram................................................................................................................. 2-19
2-14 Open on Failure Alarm Configuration Using Rear Panel Dip Switches, Simplified Diagram ...................... 2-20
2-15 Open on Failure Alarm Configuration Using External Wiring
at I/O Mating Connector, Simplified Diagram........................................................................................... 2-21
2-16 Using Current Monitoring (Typical), -1URC and -1URY Models only ......................................................... 2-22
2-17 Using Remote On-Off (Typical), -1URX and -1URY Models only............................................................... 2-23
2-18 Ripple and Noise Measurement Setup Diagram......................................................................................... 2-27

RA 19-1U 041323 v
LIST OF TABLES
TABLE TITLE PAGE
1-1 Compatible 1U HSF Power Supplies ..........................................................................................................1-3
1-2 RA 19-1U Accessories ................................................................................................................................1-3
2-1 Equipment Supplied ....................................................................................................................................2-1
2-2 Rear Panel DIP Switch Functions ...............................................................................................................2-3
2-3 Sense Resistor Values ................................................................................................................................2-22

vi RA 19-1U 041323
FIGURE 1-1. RA 19-1U RACK ADAPTER
SLOT2SLOT3SLOT4
SLOT1
3042495

RA 19-1U 041323 1-1
SECTION 1 - INTRODUCTION
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the RA 19-1U plug-in rack
adapter (Figure 1-1) used with 1U HSF Series power supplies, manufactured by Kepco, Inc.,
Flushing, New York, U.S.A. Unless otherwise noted, 1U HSF refers to the following models -1U,
-1UR, -1URT, -1URC, -1URX and -1URY.
FIGURE 1-1.
1.2 GENERAL DESCRIPTION
Kepco RA 19-1U rack adapters are specifically designed for the installation of Kepco 1U HSF
Series Power Supplies into 19-inch EIA-RS-310D standard equipment racks. The RA 19-1U
Model accommodates up to four 50W, 100W or 150W 1U HSF power supplies (Figure 1-2).
The rack adapter is user-configurable for parallel, series, or independent power supply opera-
tion. Up to four identical units may connected in parallel. Multiple rack adapters may be paral-
leled for additional current capacity. Forced current sharing and OR’ing diodes for N+1
redundancy are built into the 1U HSF power supplies. Redundant a-c inputs are provided to
deliver independent source power to each power supply in a redundant pair. User-configurable
keying ensures that only the correct power supply can be installed in a keyed slot.
FIGURE 1-2. RA 19-1U RACK ADAPTER WITH 1U HSF POWER SUPPLIES INSTALLED
1.3 MECHANICAL
The rack adapter is equipped with mounting ears for mounting in EIA-RS-310D standard 19-
inch racks. For mounting in non-standard racks, consult Kepco Applications Engineering. The
rack adapter is not configured for slides. Optional blank filler panels (see Table 1-2) are avail-
able if the full complement of power supplies is not utilized.
Mechanical dimensions, material, and finish of the RA 19-1U Rack Adapter is provided in Figure
1-5.
1.4 ELECTRICAL
An internal PCB back plate mounts connectors which interface directly with the power and sig-
nal connectors of 1U HSF Series power supplies, permitting hot swappable insertion and extrac-
tion. The other side of the back plate assembly, available from the rear, contains the fixed power
and signal connections. Figure 1-3 illustrates the interconnections provided by the RA 19-1U
Rack Adapter. Dual input terminal blocks on the back plate assembly (Figure 1-4) distribute
input power to each of the four powers supplies. Figure 1-6 is a schematic diagram of the RA
19-1U rack Adapter.
3042496
PS1 PS2 PS3 PS4

1-2 RA 19-1U 041323
All mechanical and electrical specifications are contained in the mechanical outline drawing:
Figure 1-5. See Figure 1-6 for electrical schematic diagram.
FIGURE 1-3. RA 19-1U INTERCONNECTIONS, SIMPLIFIED DIAGRAM
1.5 SAFETY
Certified to UL 60950-1, 1st Edition, 2007-10-31 (Information Technology Equipment - Safety -
Part 1: General Requirements) and CSA C22.2 No. 60950-1-03, 1st Edition, 2006-07 (Informa-
tion Technology Equipment - Safety - Part 1: General Requirements). Units are CE marked per
the Low Voltage Directive (LVD), 2006/95/EC (LVD) and 2004/108/EC (EMC). [The standards
do not apply with either DC input operation or with a-c input frequency above 66Hz.]
1.6 RoHS COMPLIANCE
RoHS 5 of 6 compliant to EU directive 2011/65/EU if used as component within telecommunica-
tion systems.
I/O CONNECTOR,
PS3, PS4 I/O CONNECTOR,
PS1, PS2

RA 19-1U 041323 1-3
1.7 ACCESSORIES
Accessories for RA 19-1U Rack Adapters are listed in Table 1-2; see also Table 2-1 for addi-
tional accessories supplied with the unit.
1.8 OPTIONS
Table 1-1 below describes the standard model options available with the RA 19-1U rack
adapter. For non-standard options, contact Kepco Applications Engineering for assistance.
FIGURE 1-4. RA 19-1U RACK ADAPTER REAR PANEL
TABLE 1-1. COMPATIBLE 1U HSF POWER SUPPLIES
RA 19-1U RACK ADAPTER SLOT COMPATIBLE POWER SUPPLIES
1, 2, 3, 4 HSF-1UR 50W, 100W and 150W Series
HSF-1U 50W and 100W Series
NOTES: 1. Contact Kepco Applications Engineering for assistance with non-standard configurations.
2. RA 19-1U is compatible with HSF-1U, -1UR, -1URC, -1URX, and -1URY models.
TABLE 1-2. RA 19-1U ACCESSORIES
ACCESSORY PART NUMBER USE
Screw, Thread forming
(4-40, 0.75 in. long, PHPH) 101-0480 Module Keying. eight (8) supplied with unit. Installed by user (see PAR.
2.3).
Cable Clamp, Nylon, with
release lever 108-0422 Support weight of AC input and DC output cables. Four (4) supplied
with unit to be installed by user as desired (see Figure 1-4)
Line cord 118-0506 Supply 115 V a-c source power to rack adapter. Two (2) supplied with
unit.
Connector 142-0449 Mating Connector for I/O connector. Two (2) supplied with unit.
Filler Panel (1/4 Rack) RFP 19-1U-14 Cover one unused 1/4 rack slot.
Filler Panel (1/2 Rack) RFP 19-1U-12 Cover two unused 1/4 rack slots.
3042498
SOURCE POWER
INPUT FOR
PS2 AND PS4
I/O CONNECTOR,
PS3, PS4 I/O CONNECTOR,
PS1, PS2
PS4 KEYING
DIP 4 DC OUTPUT
PS3, PS4 DIP 3 DIP 2
SOURCE POWER
INPUT FOR
PS1 AND PS3
DIP 1
DC OUTPUT
PS1, PS2
PS3 KEYING PS2 KEYING PS1 KEYING
CABLE CLAMP*
AC INPUT
PS2 AND PS4
CABLE CLAMP*
DC OUTPUT
PS2 AND PS4
CABLE CLAMP*
AC INPUT
PS1 AND PS3
CABLE CLAMP*
DC OUTPUT
PS1 AND PS2
* CABLE CLAMPS ARE USER
INSTALLED.

1-4 RA 19-1U 041323
FIGURE 1-5. MECHANICAL OUTLINE DRAWING, RA 19-1U RACK ADAPTER (SHEET 1 OF 2)
0.243 [6.2]
0.453 [11.5] 0.641 [16.3]
19.000 [482.6]
0.830 [21.1]
0.031 [0.8]
3.037 [77.1]
0.438 [11.1]
1.218 [30.9]
4.665 [118.5]
12.225 [310.5]
0.247 [6.3]
1.130 [28.7]
0.250 [6.4]
0.582 [14.8]
3.840 [97.5]
0.250 [6.4]
1.877 [47.7]
0.812 [20.6]
0.250 [6.4]
1.465 [37.2]
0.812 [20.6]
4.016 [102.0]
0.511 [13.0]
NOTES:
1. MATERIAL:
-CHASSIS,COVER,BACKPLATE 0.064" THK ALUM. 5052-H32
-PCB 0.063" THK. FR-4
2. FINISH
-IRIDITE GOLD ON ALL METAL PARTS.
-BACKPLATE SILKSCREEN BLACK INK.
3. IF KEYING IS REQUIRED USE THE INCLUDED SELF FORMING SCREWS 4-40x3/4" (1010480) AS PER FIGURE 2-1.
MAX. TORQUE 5 lbxin (0.6 Nxm).
4. MODULE ARE SECURED FOR HOT SWAP OPERATION WITH CAPTIVE PANEL SCREWS 4-40.
MAX. TORQUE 2 lbxin (0.23 Nxm).
5. FOR SHIPPING OR HIGH VIBRATION AND SHOCK ENVIRONMENTS,MODULES CAN EACH BE SECURED
WITH ONE FLAT HEAD SCREW 100~ , 6-32x1/4" MIN. to 1/2" MAX. LONG.(KEPCO P/N 1010408 ) OR SIMILAR.
THE SCREW WILL BE INSTALLED THRU THE COUNTERSUNK HOLES IN THE BOTTOM PAN.
0.250 [6.4]
0.311 [7.9]
0.250 [6.4]
0.444 [11.3]
1.735 [44.1]
1.250 [31.8]
0.250 [6.4]
3010247
1.218 [30.9]
1.166 [29.6]
1.009 [25.6]
0.812 [20.6]
0.582 [14.8] 0.527
[13.4]
1.106
[28.1]
1.166 [29.6]
6. DIMENSIONS ARE IN INCHES [DIMENSIONS IN BRACKETS ARE IN MILLIMETERS].
7. TOLERANCES (UNLESS OTHERWISE SPECIFIED): 3 PLACES: ±0.005, 2 PLACES ±0.01, FRACTIONS: ±1/64"

RA 19-1U 041323 1-5/(1-6 Blank)
FIGURE 1-5. MECHANICAL OUTLINE DRAWING, RA 19-1U RACK ADAPTER (SHEET 2 OF 2)
17.715 max
[449.9 max.]
0.125 [3.2] 14.267 [362.4]
14.497 [368.2]
0.230 [5.8]
3010247

041323 6-7
SECTION 1 - w
COM4 S-4
+4
L1
-4
NC3
L1 N1
N3 N1
NC4 CSB4
GND
GND
GND
L4
L4 N4
N4
N2 L3
-2
V-1 NC1
+1 -1
CSB1 S+1
V-2
NO1
+2
S-1 COM1 NC2 OR RET V+1
V+2
S+4 V+4 V-4
NO4
COM3 NO3 S-3 S+3
S+2
+3
V-3 V+3 NO2 COM2
-3
S-2
L2
1
2
3
4
5
6
7
8
DIP4
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
DIP3
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
TB-IN24
1 2 3
JP35
TB-IN13
1 2 3
JP36
J4
1 2 3 4 5 6 7 8 9
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
JP2
P-34
8 15 7 14 6 13 5 12 4 11 3 10 2 9 1
JP40
JP39
J2
1 2 3 4 5 6 7 8 9
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
JP37
J1
1 2 3 4 5 6 7 8 9
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
JP1
1
2
3
4
5
6
7
8
DIP1
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
TB34
1 2 3 4
JP42
JP43
JP41
JP44
1
2
3
4
5
6
7
8
DIP2
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
JP17
JP3 JP5
JP4
J3
1 2 3 4 5 6 7 8 9
10 11 12
13 14 15 16 17 18 19 20 21 22 23 24
TB12
1 2 3 4
JP6
JP26
JP38
P-12
8 15 7 14 6 13 5 12 4 11 3 10 2 9 1
JP45
S-2
JP29
NO1
V-1
JP30
JP14
NC1
S-1
JP20
COM4
S-2
JP12
V+4
JP23
JP24JP15
S-4
JP11
NC2
JP9
S-3
S+3
S+4
COM3
NC3
CSB
V+3
JP31
S-4
COM1
NO2
JP13
S+1
S-1
NO2
JP25
V+2
JP33
JP10
COM2
NC2 NC3
COM2
V+1
V-3
JP28
JP27
JP19
COM2
RET
COM3
CSB
S-3
COM3
S+1
S+2
COM4
JP32
JP21
JP34
S-3
CSB
S+2
S+2
JP16
S+3
S+3
JP18
V-2
RET
CSB
NO3
V-4
S+4
CSB
NO4
CSB
JP22
S-2
NO3
RET NC4
FIGURE 1-6. RA 19-1U SCHEMATIC DIAGRAM
PROPRIETARY DATA
©2010, KEPCO, INC
3020630
1-7/1-8 (Blank)
6-6/6-7

RA 19-1U 041323 2-1
SECTION 2 - INSTALLATION
2.1 UNPACKING AND INSPECTION
This equipment has been thoroughly inspected and tested prior to packing and is ready for
operation. After careful unpacking, inspect for shipping damage before attempting to operate. If
any indication of damage is found, file an immediate claim with the responsible transport ser-
vice. See Table 2-1 for a list of equipment supplied.
2.2 CONFIGURING THE RACK ADAPTER
Prior to installation the rack adapter must be configured by the user. Configuration consists of
the following:
• For configurations that use multiple output voltages it is possible to key the rack adapter
to accept only a power supply with corresponding keying (see PAR 2.3).
• Configuring slots for independent, parallel, or series operation. This can be done by
means of DIP switches mounted on the rear panel, or externally by wiring the associated
I/O mating connector and DC OUTPUT terminals (see PAR. 2.4).
2.3 RACK ADAPTER KEYING INSTRUCTIONS
RA 19-1U rack adapters incorporate a keying mechanism to prevent accidental insertion of the
incorrect model 1U HSF power supply into any position. The 1U HSF power supplies are keyed
by voltage at the factory. The keying mechanism will prevent engagement of any of the 1U HSF
power supply's connectors with those on the rack adapter's back plate unless the key and key-
way align. The key pins are on the 1U HSF power supply and are set at the factory. DO NOT
ALTER THE KEYING AT THE POWER SUPPLY. The keyway is established by installing screws
(provided) so that the only open holes match the power supply pins. The user can configure
each power supply slot for the desired voltage in the desired position. Figure 1-4 shows the
location of key positions for each slot and Figure 2-1 shows the configuration required for volt-
age selection.
TABLE 2-1. EQUIPMENT SUPPLIED
ITEM QUANTITY PART NUMBER
Rack Adapter 1 RA 19-1U
I/O Connector (Mating) 2 142-0449
Line cord (115 V a-c, 15A max, North American style plug, 6 ft.) 2 118-0506
Instruction Manual 1 243-1025
Keying screws (4-40 x 0.75 in., thread forming) 8 101-0480
Hood for I/O Connector (Mating) P/N 142-0449 2 108-0204
Cable clamp with release latch 4 108-0422

2-2 RA 19-1U 041323
2.3.1 ESTABLISHING KEY POSITIONS
To establish the keying of any position, simply install the 4-40 x 0.75 in. thread-forming screws
(Kepco P/N 101-0480) into the corresponding holes as indicated in Figure 2-1. DO NOT OVER-
TIGHTEN these screws (max torque 5 in.-lbs. (0.6 N x m). DO NOT ALTER THE KEYING AT
THE POWER SUPPLY.
FIGURE 2-1. RA 19-1U RACK ADAPTER KEYING
2.4 SLOT CONFIGURATION
Configuring slots of the rack adapter for independent, parallel or series operation is accom-
plished either by means of DIP switches mounted on the rear panel associated with each slot
(see Figure 1-3), or externally by connecting the appropriate pins of the associated I/O mating
connector. DIP switch functions are explained in Table 2-2.
Slot configuration requires the following selection:
1. Select independent (PAR. 2.4.1), parallel (PAR. 2.4.2), or series (PAR. 2.4.3) operation.
2. Select local or remote sensing; PAR. 2.4.1 (independent), 2.4.2, (parallel) or 2.4.3, (series).
3. Optional: Select close-on-failure or open-on-failure alarm (PAR. 2.4.4).
4. Current Monitoring (Models -1URC and -1URY only, see PAR. 2.5).
5. Remote On-Off (Models -1URX and -1URY only, see PAR. 2.6).

RA 19-1U 041323 2-3
2.4.1 INDEPENDENT OPERATION
The rack adapter is preconfigured at the factory for independent operation of all slots. DIP
switch positions 3, 4 and 5 associated with each slot must be set to OFF (open) for each power
supply to be operated independently.
NOTE: Either local or remote sensing must be connected for the 1U HSF power supplies
to work properly.
The rack adapter is shipped from the factory with each power supply position configured for
local sensing (see Figure 2-2). Sensing for each slot can be configured independently:
• Local sensing using rear panel DIP switches
• Local sensing using external jumpers connected to the I/O mating connector or the DC
OUTPUT terminal block.
• Remote sensing
TABLE 2-2. REAR PANEL DIP SWITCH FUNCTIONS
DIP
SWITCH
POSITION FUNCTION DIP SWITCH SET TO ON (CLOSED) DIP SWITCH SET TO OFF (OPEN)
NOTE: BOLD TYPE INDICATES FACTORY SETTINGS.
1, 2
Local /
Remote
Sensing
Selection
Required ON for independent operation with
Local Sensing. Position 1 connects V+ to S+,
Position 2 connects V– to S– (see PAR.
2.4.1.1).
Position 1 and 2 required OFF for:
a) Independent configurations using Remote
Sensing (see PAR. 2.4.1.3).
b) Independent configurations using Local Sens-
ing with user supplied connections from V+ to S+
and V– to S– (see PAR. 2.4.1.2).
c) All parallel configurations (sensing must be
established using external wires) (see PAR.
2.4.2.3).
d) All series connections (see PAR. 2.4.3).
3, 4
Connect
Sense
+ and –
in parallel
Required ON for parallel configurations using DIP
switch settings to connect the sense leads in par-
allel. Position 3 connects +S to adjacent slot +S,
Position 4 connects –S to adjacent slot –S (see
PAR. 2.4.2.3.1 for local sensing, PAR. 2.4.2.3.3
for remote sensing).
Position 3 and 4 required OFF for all configura-
tions except parallel configurations using DIP
switch settings to connect the sense leads in
parallel.
5Current
Share
Required ON for parallel operation (connects cur-
rent share lines in parallel) unless connections are
made via external wires (see PAR. 2.4.2.2.1)
Required OFF for
a) independent and series configurations.
b) Parallel configurations using external wires
to connect current share lines in parallel.
6, 7 Close on
Failure
Alarm
When set to ON, allows a single alarm to provide
failure indication (contact closure between N.O.
pin and COM pin) if any one of many power sup-
plies fails (see PAR. 2.4.4.1).
When set to OFF, individual power supplies
produce closure between I/O connector N.O.
and COM pins upon failure (see PAR. 2.4.4.1).
8** Open on
Failure
Alarm
** When set to ON, allows a single alarm to pro-
vide failure indication (contact open between N.C.
pin and COM pin) if any one of many power sup-
plies fails (see PAR. 2.4.4.2).
** When set to OFF, individual power supplies
produce open between I/O connector N.C. and
COM pins upon failure (see PAR. 2.4.4.2).
** Not applicable for HSF-1URX and -1URY models (see PAR 2.6).

2-4 RA 19-1U 041323
2.4.1.1 INDEPENDENT OPERATION - LOCAL SENSING USING REAR PANEL DIP SWITCHES
The rack adapter slots are preconfigured at the factory for local sensing using rear panel DIP
switches. If a slot has been configured for other than local sensing using DIP switches and it is
necessary to reconfigure it for local sensing, simply set positions 1 and 2 of the DIP switch asso-
ciated with that slot to ON (closed). External sensing connections must be removed. When set
to ON (closed) DIP switch position 1 connects (V+) to (S+) and position 2 connects (V–) to (S–).
See Figure 1-3 for DIP switch locations. Figure 2-2 illustrates local sensing of PS1 and PS2 by
setting positions 1 and 2 of rear panel DIP 1 and 2 to ON (closed); positions 3 and 4 must be set
to OFF (open). Position 5 (current share) must be set to OFF and positions 6, 7, and 8 (alarms)
can be configured per PAR. 2.4.4.
FIGURE 2-2. INDEPENDENT OPERATION, LOCAL SENSING FOR PS1 AND PS2 USING
REAR PANEL DIP SWITCHES, SIMPLIFIED DIAGRAM

RA 19-1U 041323 2-5
2.4.1.2 INDEPENDENT OPERATION - LOCAL SENSING USING EXTERNAL WIRING
To configure a slot for local sensing using external wiring, first set rear panel DIP switch posi-
tions 1 and 2 of the DIP switches associated with that slot to OFF (open).
External local sensing is accomplished by connecting (V+) to (S+) and (V–) to (S–). This can be
done at either the mating I/O connector supplied (see Table 2-1) or at the DC OUTPUT terminal
block. See Figure 1-3 for DIP socket locations. Figure 1-3 illustrates I/O connector pin assign-
ments. Figure 2-3 illustrates local sensing of PS1 and PS2 using external jumpers connected to
the I/O mating connector.
NOTE: The rear panel DIP switch settings established at the factory for positions 1 and 2 of
the associated DIP switch MUST be changed to OFF (open) if this option is chosen.
Positions 3 and 4 (connecting sense lines in parallel) and Position 5 (current share) must be set
to OFF. Configure Positions 6, 7, and 8 (alarms) per PAR. 2.4.4.
FIGURE 2-3. INDEPENDENT OPERATION, LOCAL SENSING FOR PS1 AND PS2 USING
EXTERNAL JUMPERS AT I/O MATING CONNECTOR, SIMPLIFIED DIAGRAM

2-6 RA 19-1U 041323
2.4.1.3 INDEPENDENT OPERATION - REMOTE SENSING
Remote sensing is accomplished by connecting +Load to (S+) and –Load to (S–). Figure 2-4
illustrates remote sensing for PS1 and PS2 using wires connected to the I/O mating connector.
NOTE: The rear panel DIP switch settings established at the factory for positions 1 and 2 of
the associated DIP switch MUST be changed to OFF (open) if this option is chosen.
Positions 3 and 4 (connecting sense lines in parallel) and Position 5 (current share) must be set
to OFF. Configure Positions 6, 7, and 8 (alarms) per PAR. 2.4.4.
FIGURE 2-4. INDEPENDENT OPERATION, REMOTE SENSING FOR PS1 AND PS2 USING
EXTERNAL WIRING AT I/O MATING CONNECTOR, SIMPLIFIED DIAGRAM

RA 19-1U 041323 2-7
2.4.2 PARALLEL OPERATION
Up to four Identical 1U HSF power supplies can be connected in parallel to provide redundant
operation or increased output current to a common load. Blocking diodes are incorporated in
HSF -1U and -1UR power supplies. The power leads must be connected in parallel externally
(see PAR. 2.10.4.2). (Configurations using internal parallel busing are also possible; consult
Kepco’s Applications Engineering for details.) Three things must be considered when configur-
ing the rack adapter for parallel operation:
• DC OUTPUT
• CURRENT SHARE
• SENSE
2.4.2.1 PARALLEL DC OUTPUT CONNECTIONS
The power leads must be connected in parallel externally (see PAR. 2.10.4.2). DC Output V(+)
and V(–) must be connected in parallel at the DC OUTPUT terminal block (see Figures 2-5
through 2-10).
2.4.2.2 PARALLEL CURRENT SHARE CONNECTIONS
The Current Share pins of the 1U HSF power supplies must be connected together for parallel
operation. This can be done using either the rear panel DIP switches to configure adjacent slots
in parallel (PAR 2.4.2.2.1), or externally by wiring the I/O mating connector for configuring slots
1 and 4 (PAR. 2.4.2.2.2).

2-8 RA 19-1U 041323
2.4.2.2.1 PARALLEL CURRENT SHARE - REAR PANEL DIP SWITCHES
To configure adjacent slots, use the rear panel DIP switches to connect the Current Share bus.
Using rear panel DIP switches permits only adjacent power supplies be connected in parallel.
To connect the current share lines locate the applicable DIP switches: (see Figure 1-3) and set
position 3, 4, 5 to ON (closed). The example illustrated in Figure 2-5 shows two 50W units (slot
1 and slot 2) connected in parallel using rear panel DIP switches to configure the current share
bus, enabled via position 5 of DIP switch 2 for slots 1/2.
NOTE: If rear panel DIP switch positions 3, 4 are closed (ON), use only one pair of sense
lines to monitor voltage.
FIGURE 2-5. PARALLEL OUTPUTS USING REAR PANEL DIP SWITCHES TO PARALLEL SENSE
LINES AND CURRENT SHARE, PS1 AND PS2 (TYPICAL), SIMPLIFIED DIAGRAM