KEPCO HSF 350W Series - Manual

©2003, KEPCO, INC 1
Data subject to change without notice 228-1367 REV 6
I N S T R U C T I O N M A N U A L
HSF
KEPCO
KEPCO, INC. " 131-38 SANFORD AVENUE " FLUSHING, NY. 11352 U.S.A. " TEL (718) 461-7000 " FAX (718) 767-1102
http://www.kepcopower.com " email: [email protected]
An ISO 9001 Company.
KEPCO SINGLE OUTPUT 350 WATT
HOT SWAP PLUG-IN POWER SUPPLIES
I — INTRODUCTION
The Kepco HSF 350 Watt Series hot swappable, high frequency switching, plug-in power supplies employ forward conversion and power fac-
tor correction and are designed to operate in a fault tolerant power system with either a-c or d-c input. A resistor and thyristor soft-start circuit
limits start-up surge. A built-in forced current share circuit and OR-ing diodes allow configuration for hot-swap and parallel-redundant N+1
operation.
These power supplies are designed to be used with Kepco’s Series RA 19-(X)B rack adapters (Figure 1). The RA 19-3B rack adapter accepts
up to three 350 Watt units; RA 19-4B accepts up to two 350 Watt units and up to two 50W, 100W, or 150W units (see Figure 1). All input/output
connections are through a 24 pin connector that plugs in to the rack adapter. All external connections are made through the rack adapter.
Seven models may be selected for outputs of 3.3, 5, 12, 15, 24, 28, or 48V (see Table 1).
When the input is cut off, the output is maintained for 15 milliseconds minimum. If the power supply shuts down due to an output overvoltage
condition, it is then necessary to wait 90 seconds minimum (120V a-c input) or 120 seconds minimum (240V a-c input) before turning the unit
on again. EMI filtering is designed to meet FCC Class A rating and VDE 0871 Class A rating. This page contains specifications for each model
of the HSF 350 Watt Series. Environmental specifications for each model are the same.
II — FEATURES
FRONT PANEL ACCESS. The front panel provides a power ON/OFF switch controlling input power and a “VDC ON” light which indicates
when the unit is operating. NOTE: The ON/OFF switch must be set to OFF before removing unit from rack adapter. A RESET button
restores output power in the event that overcurrent or overvoltage protection has tripped, or thermal overload or fan malfunction has occurred.
When the unit is used in parallel redundant configurations, the module with the highest voltage functions as the master. The other units are
slaves, and track the output voltage of the master. The front panel Vadj trimmer provides adjustment of the output voltage within the limits
specified in Table 1; test points connected to the +S and –S lines are available at the front panel for measuring the output.
FORCED CURRENT SHARE CIRCUIT. When units are configured for N+1 parallel redundant operation, it is desirable for current to be
divided equally among the paralleled supplies. When the CSB (Current Share Bus) lines of paralleled HSF units are connected together, the
load current is forced to divide equally between all paralleled units. If one unit fails, the remaining units will continue to supply the load, and the
load current will be divided equally among the remaining operating units. The failed unit is automatically isolated from the circuit by a built-in
isolation diode.
TABLE 1. OUTPUT RATINGS AND SPECIFICATIONS, HSF 350W SERIES
MODEL HSF 3.3-70 HSF 5-70 HSF 12-30 HSF 15-24 HSF 24-16 HSF28-13 HSF 48-7.5
OUTPUT VOLTS, d-c (NOMINAL) 3.3V 5V 12V 15V 24V 28V 48V
ADJUSTMENT RANGE 2.65-3.5 4.0 - 5.5V 9.6 - 13.2V 12.0 - 16.5V 19.2 - 26.5V 22.4 - 30.8V 38.4 - 52.8
OUTPUT CURRENT (NOMINAL)
(1)
(1) Derates same as Ouptut Power. (2) See power derating curve, Figure 4. (3) OV setting = % tracking above output. When the output voltage ecxeeds this limit the output is cut
off. To reset the unit it is necessary to remove the ac power, wait 40 seconds, and reconnect the power. However, when the power supply shuts down due to an increase in internal
temperaure the restart cycle should not begin until the temperature returns to within specifications (4) If the output voltage falls to less tha 60% of the rated output voltage for more
than 20 seconds, the output will be cut off. To reset the unit it is necessary to remove the ac power, wait 40 seconds, and reconnect the power.
70A 70A 30A 24A 16A 13A 7.5A
OUTPUT POWER (NOMINAL)
(2)
230W 350W 360W 360W 384W 364W 360W
RIPPLE
AND
NOISE
(mV p-p)
0-40°C
10-100%
LOAD
source (max) 50 50 30 40 40 40 40
switching (typ) 30 30 40 40 60 60 60
switching (max) 50 50 70 70 100 100 100
spike noise
(d-c—50MHz)
<100 <100 <150 <175 <200 <200 <300
OVERVOLTAGE SETTING
(3)
(0-40 °C, NOM. INPUT)
4 - 30% 4 - 30% 4 - 30% 4 - 30% 4 - 30% 4 - 30% 4 - 30%
OVERCURRENT SETTING
(4)
(25 °C, NOM. INPUT)
Rectangular type characteristic
73.0 - 84.0A 73.0 - 84.0A 31.5 - 36.0A 25.2 - 28.8A 16.8 - 19.2A 13.6 - 15.6A 7.8 - 9.0A