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KEPCO, INC. 



 131-38 SANFORD AVENUE 



  FLUSHING, NY. 11355 U.S.A.



  TEL (718) 461-7000



 FAX (718) 767-1102



www.kepcopower.com   



 email: [email protected]

 081721

228-1532 REV 16

3

CONNECTIONS:  

The 24-pin I/O connector is designed

to mate with the corresponding connector in the Series RA
19-(X)B Rack Adapter.

(+) SENSE, (–) SENSE: 

 These lines are provided to com-

pensate for voltage drops in the load connecting wires. 

The

Sense lines must be connected to their respective (+)
and (–) output terminals,

 either at the load or at the rack

adapter (see Rack Adapter Manual). The connection
ensures the most accurate error tracking. Maximum volt-
age drop compensation in the load connecting wires for
each model is calculated as the difference between the
minimum overvoltage (see Table 1 or 2) and the maximum
adjustment range (see Table 1 or 2), divided by two to give
the voltage drop compensation per lead. Higher compen-
sation values are possible if output voltage is decreased
below the maximum adjustment range shown in Table 1 or
2.

NOTE

:

The Sense lines must be connected for

the power supply to work properly!

OUTPUT (+), OUTPUT (–): 

 These lines are the power supply

d-c output lines which are connected to the load.

CURRENT SHARE BUS (CSB): 

 (Not available on 3.3V

model.) Connecting the CSB lines of power supplies oper-
ating in a parallel configuration causes output current to be
shared equally. (See Rack Adapter Manual for additional
information on parallel configurations.). For current sharing
to work properly the outputs of all paralleled units must be
within 250 mV (max) of each other and each unit must be
operating at between 10% to 100% of rated output current.
If current to the load goes below 10% for each unit in cur-
rent share mode, all MASTER ON lights may go on (see
load effect specifications); this indicates that forced current
share is no longer working, units are simply in automatic
current share mode. (If forced current sharing at less than
10% nominal current per supply is needed, contact Kepco
application engineering.) Remote sensing is recom-
mended. For master/slave operation to work properly each
unit should be adjusted to 40 mV (optimum) less than the
next paralleled unit (unit 1 is adjusted to V

OUT

, unit 2 to

V

OUT

 – 40mV, and unit 3 to V

OUT

 – 80mV, etc. If the master

fails, the unit 2 will become the new master). The 40 mV
difference can be reduced to a minimum of 25 mV as
needed to parallel many units and still keep all units within

250 mV of each other. Adjust the outputs using Vadj trim-
mer on front panel. 

• Optimum difference among output voltages of par-

alleled units: 40mV

• Maximum difference among output voltages of

paralleled units: 250 mV

• Minimum difference among output voltages of par-

alleled units: 25 mV

ALARM: 

 The Alarm NC (normally closed) - Open on Fail-

ure and Alarm NO (normally open) - Close on Failure lines
are relay contacts referenced to Alarm Common. If the unit
fails, the path between Alarm NC - Open on Failure and
Alarm Common opens, the path between Alarm NO - Close
on Fail and Alarm Common is a short circuit. Figure 3 illus-
trates typical Close on Fail and Open on Fail circuits to give
a failure indication if any one of a number of power supplies
fail.

INPUT POWER: 

Line (either a-c or d-c source power), Neu-

tral and Ground (chassis)

FIGURE 3.  TYPICAL ALARM CIRCUIT DIAGRAMS

Содержание HSF 12-4.3PFC

Страница 1: ...d models and Section IV on page 6 suffix C T X and Y OPTIONS Options are identified by suffix T PFCT offers improved efficiency less weight and the addition of a 28V 50W model C PFCC offers current mo...

Страница 2: ...line ac input line failure etc results in an alarm All models include an isolated internal relay offering nor mally closed and normally open contacts referenced to an isolated common These contacts a...

Страница 3: ...each other and each unit must be operating at between 10 to 100 of rated output current If current to the load goes below 10 for each unit in cur rent share mode all MASTER ON lights may go on see loa...

Страница 4: ...typ 200 Va c 100 load Power Factor 0 99 typ 100V a c 0 95 typ 200V a c Switching Frequency 140KHz typical TABLE 1 OUTPUT RATINGS AND SPECIFICATIONS HSF PFC 50W SERIES STANDARD NO SUFFIX MODEL HSF 3 3...

Страница 5: ...c for one minute cutout current 20 mA INSULATION RESISTANCE Between input and ground output and ground input and output 100 Megohms min 500V d c LEAKAGE CURRENT 0 24 mA maximum IEC 950 and UL 1950 120...

Страница 6: ...1 PFCC PFCT PFCX PFCY HSF 12 4 3 1 PFCC PFCT PFCX PFCY HSF 15 3 5 1 PFCC PFCT PFCX PFCY HSF 24 2 2 1 PFCC PFCT PFCX PFCY HSF 28 1 8 1 PFCC PFCT PFCX PFCY HSF 48 1 1 1 PFCC PFCT PFCX PFCY OUTPUT VOLTS...

Страница 7: ...Between input and case ground 2KV a c for one minute Between output and case ground 500V a c for one minute cutout current 20 mA INSULATION RESISTANCE Between input and ground output and ground input...

Страница 8: ...fault FIGURE 5 COMPONENT LOCATIONS When output voltage is available the green VDC ON LED is on While monitoring output voltage at the front panel test points the Output Voltage Adjust trimmer allows...

Страница 9: ...ANFORD AVENUE FLUSHING NY 11355 U S A TEL 718 461 7000 FAX 718 767 1102 www kepcopower com email hq kepcopower com 081721 228 1532 REV 16 9 FIGURE 6 HSF PFC 50W INCLUDING SUFFIX C T X AND Y POWER SUPP...

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