QUICK START GUIDE
KEPCO
An ISO 9001 Company.
RA 19-4C
RACK ADAPTER
I — INTRODUCTION
SCOPE OF MANUAL. This Quick Start Guide covers
installation and operation of the Kepco RA 19-4C Rack
Adapter for two common configurations. For the full capabilities and specifications of the RA 19-4C and to take
advantage of the many choices and features not covered in
this Quick Start Guide, the user is urged to download the
complete Operator’s Manual from the Kepco web site at
www.kepcopower.com/support/opmanls.htm#ra19-4c.
DESCRIPTION. Kepco RA 19-4C rack adapters are specifically designed for up to four 300W, 600W, 1200W/ 1500W HSF power supplies.
RA 19-4C
Rack Adapter
The rack adapter is user-configurable for parallel, series, or
independent power supply operation. Forced current sharing and OR’ing diodes for N+1 redundancy are built into the
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 can ensure that
only the correct power supply can be installed in a keyed
slot. Input/output connections between RA 19-4C and HSF
power supply are via HSF connectors that plug into corresponding connectors of the RA 19-4C. All connections are
made at the rear panel (see Figure 1).
FIGURE 1. REAR PANEL CONNECTIONS, TYPICAL FOR EACH SLOT
II — PRE-INSTALLATION
NOTE: For HSF 300W and 600W either local
or remote sensing MUST be used;
sense connections are not used for
HSF 1200W/1500W.
DIP SWITCHES. The DIP switches (Figure 1) are arranged as follows: DIP 1 is for PS1 sense lines; DIP 2 is for PS2 sense lines and for paralleling PS1 and PS2. DIP 3 is for PS3 sense lines and for paralleling PS2 and PS3. DIP 4 is for PS4 sense lines and for paralleling PS3 and PS4. Table 1 describes the function of each DIP switch position.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: hq@kepcopower.com
©2009, KEPCO, INC 1
Data subject to change without notice 228-1671 REV 1
INDEPENDENT OPERATION. The RA 19-4C rack adapter is shipped with the DIP switches of all slots configured for independent operation (see Figure 1) and local sensing. If HSF 1200W/1500W units are to be installed, DIP switch positions 1 through 4 to OFF are not functional since sense connections are not used.
PARALLEL OPERATION. The most common use for the RA 19-4C rack adapter is with two or more HSF’s connected in parallel to a single load with forced current sharing to increase current output, increase reliability and/or provide redundancy. Only adjacent slots can be connected in parallel using DIP switches.
DIP
SWITCH
POSITION
1, 2
(SEE
NOTE)
TABLE 1. REAR PANEL DIP SWITCH FUNCTIONS
FUNCTION DIP SWITCH SETTINGS
Position 1 connects V+ to S+, Position 2 connects V– to S– .
Local /
Remote
Sensing
Selection
Both required ON (factory default) for independent operation with Local Sensing.
Both required OFF for:
a) Independent configurations using Remote Sensing.
b) Independent configurations using Local Sensing with user supplied connections from V+ to S+ and V– to S–.
c) All parallel configurations (sensing must be established using external wires).
d) All series connections.
3, 4
(SEE
NOTE)
5
6, 7
8
9
10
NOTE: Positions 1, 2, 3, 4 not functional for HSF 1200W and 1500W modules; leave in default position.
Connect
Sense
+ and –
in parallel
Current
Balance
(forced
current
share)
Close on
Failure
Alarm
Open on
Failure
Alarm
Remote
Voltage
-Common
Position 3 connects +S to adjacent slot +S, Position 4 connects –S to adjacent slot –S.
Both required OFF (factory default) for all configurations except parallel configurations using DIP switch settings to connect the sense leads in parallel.
Both required ON for parallel configurations using DIP switch settings to connect the sense leads in parallel.
Required ON for parallel operation with forced current share (connects current share lines in parallel) unless connections are made via external wires
Required OFF (factory default) for
a) independent and series configurations.
b) Parallel configurations using external wires at I/O connector to connect CSB (current share bus) lines in parallel.
c) Parallel configurations without forced current sharing (current balancing),
When set to OFF(factory default), individual power supplies produce closure between I/O connector N.O. and COM pins
upon failure .
When set to ON, parallels N.O pins of adjacent slots to allow a single alarm to provide failure indication (contact closure
between N.O. pin and COM pin) if any one of many power supplies fails.
When set to OFF(factory default), individual power supplies produce open between I/O connector N.C. and COM pins
upon failure.
When set to ON, connects N.C to COM between adjacent slots so that individual alarms are connected in series. This
allows a single alarm to provide failure indication (contact open between N.C. pin and COM pin) if any one of many
power supplies fails.
When both set to OFF(factory default), allows independent voltage control of each power supply
When both set to ON, enables control of multiple supplies from one power supply designated as the Master.
Figure 3 shows HSF’s in slots 3 and 4 connected in parallel (master/slave, master established automatically by
voltage) with forced current sharing and a close-on-fail
alarm circuit. Both HSF modules are configured for output
voltage to be adjusted from the front panel trimpot (factory
default setting). See operator manual for other output voltage adjustment options.
Configure DIP 4:
1. (HSF 300W, 600W only) Set positions 1 and 2, to ON.
This connects +S to +V and –S to –V for slot 4, establishing local sensing for slot 4.
(HSF 1200W/1500W only) Always set positions 1 and
2, to OFF. Local/remote sensing not used.
2. (HSF 300W, 600W only) positions 3 and 4, to ON. This
connects sense lines (+S to +S and –S to –S) for slots
4 and 3.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: hq@kepcopower.com
(HSF 1200W/1500W only) Set positions 3 and 4, to
OFF. Local/remote sensing not used.
3. Set position 5, to ON. This connects the current share
bus (CB) for slots 4 and 3.
4. Set positions 6 and 7 to ON. Position 6 connects the
normally open ALARM (N.O.) lines and position 7 connects the ALARM (COM) (common) for slots 4 and 3,
implementing a close-on-fail alarm circuit (see equivalent schematic shown in Figure 3. If either PS3 or PS4
fails, a contact closure provides continuity across pins 7
and 14 of both I/O 4 and I/O 3.
5. Set position 8 to OFF. This position is only set to ON for
open-on-fail alarm circuits.
6. Set position 9 to OFF. Isolates RV (remote voltage)
lines between slot 4 and 3, however RV is not used
(output voltage is controlled by the front panel trimpot).
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7. Set position 10 to ON. This connects the common lines
(-COM) for slots 4 and 3.
Configure DIP 3:
The rack adapter is supplied with six cable clamps
equipped with release levers that can be snapped into
holes provided in the rear panel (see Figure 1) to support
the weight of the input, output and signal cables.
1. (HSF 300W, 600W only) Set positions 1 and 2, to ON.
This connects +S to +V and –S to –V for slot 3, establishing local sensing for slot 3.
(HSF 1200W/1500W only) Always set positions 1 and 2,
to OFF. Local/remote sensing not used.
2. (HSF 300W, 600W only) Set positions 3 and 4, to OFF.
This isolates sense lines (±S) between slots 3 and 2.
(HSF 1200W/1500W only) Always set positions 3 and 4,
to OFF. Local/remote sensing not used.
3. Set position 5 to OFF. This isolates the current share
bus (CB) between slots 3 and 2.
4. Set position 6 and 7, to OFF. This isolates the ALARM
(N.O.) and ALARM (COM) lines between slots 3 and 2.
5. Set position 8 to OFF. This position is only set to ON for
open-on-fail alarm circuits.
6. Set position 9 to OFF. Isolates RV (remote voltage) lines
between slot 3 and 2, however RV is not used (output
voltage is controlled by the front panel trimpot).
7. Set position 10 to OFF. This isolates common (-COM)
lines between slots 3 and 2.
OPTIONAL PROTECTIVE COVER: A clear plastic cover (Kepco P/N 137-0145) is available as an accessory to protect the rear terminals against accidental contact. See Operator Manual for details.
OPTIONAL BUS BAR: Bus bars which connect output terminals for parallel or series operation are available as accessories. See Operator Manual for details.
OPTIONAL KEYING: HSF power supplies are keyed by voltage at the factory. The keyway is established by installing screws (4-40 x 0.75 in. thread-forming, Kepco P/ N 101-0480, provided) into the corresponding holes as indicated in Figure 2 so that the only holes open match the power supply pins. DO NOT OVERTIGHTEN these screws (max torque 5 in.-lbs. (0.6 N x m).
SERIES OPERATION. See Operator Manual for series operation details.
ALARMS. For independent configurations, Close on Fail contact closure is across I/O connector pins 7 (ALARM N.O.) and 14 (ALARM COM). Open on Fail circuits are across I/O connector pins 6 (ALARM N.C.) and 14 (ALARM COM). Figure 3 shows a parallel close-on-fail circuit for slots 3 and 4 using the DIP switches to make the connections. See Operator Manual for other options.
III — INSTALLATION
MOUNTING RACK ADAPTER: The rack adapter
mounts directly to EIA-RS 310D standard 19" racks via the
two mounting ears; two screws are required per mounting
ear for proper support. CAUTION: RACK ADAPTER
SHOULD BE MOUNTED BEFORE INSTALLING POWER
SUPPLIES. Install each HSF power supply in desired slot
and secure using two retaining latches as described by the
applicable HSF Power supply manual. Make sure the two
latches are in the open position before installing HSF modules.
FIGURE 2. RACK ADAPTER KEYING
OPTIONAL I/O CONNECTOR: Mating Europlugs (Kepco P/N 142-0544) for the Alarm I/O Euroheaders are available as accessories for the Sense connections (±S) and independent Alarm connections.
OPTIONAL A-C CONNECTIONS: Two line cords are available as accessories. In North America where 115/ 230V a-c source power is used, Kepco recommends the use of a Kepco line cord (P/N 118-1145, North American style plug, 30A maximum, 6 ft. long). European applications may require the use of Kepco line cord P/N 118-1146 (250V, 32A maximum).
INSTALLATION/REMOVAL OF HSF POWER SUPPLIES: Use two retaining latches on each HSF power
supply to install or remove power supply to/from desired
slot in accordance with the applicable HSF Power supply
manual. Refer to RA 19-4C Operator Manual for keeping
the power supplies secure under severe shock or vibration
conditions.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
022310 228-1671 REV 1 3
http://www.kepcopower.com email: hq@kepcopower.com
FIGURE 3. SLOTS 3 AND 4 CONFIGURED FOR PARALLEL OPERATION, WITH CLOSE ON FAIL ALARM CIRCUIT
IV — WIRING
A-C WIRING: It is the user’s responsibility to obey all
local, national and international safety rules regarding
field-wired apparatus and the grounding of the metal
cover and case of any instrument connected to the a-c
power source. Grounding is an intrinsic part of the safety
aspect of the unit.
SOURCE POWER: Source power requirements are determined by the HSF power supply (see HSF power supply Instruction Manual); no adjustment or modification of the rack adapter is required.
Source power can also be custom configured via jumpers
on the internal PC board. Contact Kepco Applications
Engineering for further details.
Wire size range for each terminal block is AWG 20-10/
IEC, rigid: 0.5 - 6mm2, or flexible (stranded): 0.5 - 4mm2;
torque to 6 lb-in (0.6 N•M) maximum. CAUTION: DO NOT
EXCEED MAXIMUM TERMINAL BLOCK RATING OF
500V AT 36A. The terminals are labeled L, N, and G.
Their functions are:
• Terminal G (Ground) is the safety ground connection for the RA 19-4C.
• Terminals L (Line Phase) and N (Neutral) are
connected to the input power entry connectors.
Source power is provided to the power supplies
indicated by the label on the rear panel.
CONTROL SIGNALS: Access to all the control signals for each HSF power supply is provided via four 15pin D-subminiature I/O connectors on the rear panel of the rack adapter (see Figure 1). Four mating connectors (Kepco P/N 142-0449) are provided in a plastic bag. Basic functions (Sense and Alarm) are also available via the 5pin ALARM I/O Euroheader.
OUTPUT LOAD: Load connections to the rack adapters are achieved via four pairs (DC OUTPUT + and –) of output terminals located on the rear panel assembly. Wire gage may be between 22 GA and 6 GA depending on ring lug used; torque to 20 lb-in (2.3 N•M) maximum. As the length of load wires increases, ripple and noise may increase proportionally, therefore length and placement are critical for minimum ripple and noise. A filter consisting of a 50mF electrolytic capacitor in parallel with a 0.01mF capacitor must be used to eliminate unwanted ripple and noise pickup on the load wire during measurements. For noise-sensitive applications the load wires and sense wires must be twisted and/or shielded.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: hq@kepcopower.com
4 228-1671 REV 1 022310
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