KEPCO HSF 5-60 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
particular 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
OPERATOR’S MANUAL
KEPCO INC.
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL [phone] FAX [phone]
email: [e-mail] World Wide Web: http://www.kepcopower.com
An ISO 9001 Company.
HSF 300W
©2015, KEPCO, INC
P/N 228-1696-r3
HSF 300W
POWER SUPPLY
HSF 300W
POWER SUPPLY
SINGLE OUTPUT POWER SUPPLIES
SINGLE PHASE, POWER FACTOR CORRECTED
UNIVERSAL AC INPUT
HSF 5-60, HSF 12-27, HSF 15-22,
HSF 24-14, HSF 28-12, HSF 48-7

iHSF 300W 042315
TABLE OF CONTENTS
SECTION PAGE
LIST OF FIGURES
FIGURE TITLE PAGE
LIST OF TABLES
TABLE TITLE PAGE
1. Introduction........................................................................................................................................................ 1
1.1 Scope of Manual ............................................................................................................................................ 1
1.2 Description ..................................................................................................................................................... 1
2. Specifications.................................................................................................................................................... 2
3. Features......................................................................................................................................................... 5
3.1 DIP Switch Configuration ............................................................................................................................... 5
3.2 Front Panel Access........................................................................................................................................ 6
3.3 Keying ............................................................................................................................................................ 6
3.4 Output Voltage Control................................................................................................................................... 7
3.4.1 Front Panel Voltage Control........................................................................................................................ 7
3.4.2 Remote Voltage Control.............................................................................................................................. 7
3.5 Remote On-Off............................................................................................................................................... 8
3.6 Protection Circuits.......................................................................................................................................... 9
3.6.1 Overvoltage And Overtemperature Protection ............................................................................................ 9
3.6.2 Overcurrent Setting and Protection............................................................................................................. 9
3.6.3 Fan Failure .................................................................................................................................................. 9
3.6.4 Undervoltage............................................................................................................................................. 10
3.7 Alarm Settings.............................................................................................................................................. 10
3.7.1 Visual Alarm. ............................................................................................................................................. 10
3.7.2 Alarm Signals. ........................................................................................................................................... 10
3.7.2.1 Internal Isolated Relay Alarm ................................................................................................................. 10
3.7.2.2 Optically-Coupled Logical Alarm ............................................................................................................ 10
3.8 VDC ON/Alarm Indicator Power Options...................................................................................................... 11
3.9 Local/remote Sensing................................................................................................................................... 12
3.10 Retaining Latches......................................................................................................................................... 12
4. Load Connection............................................................................................................................................. 12
5. Connecting Multiple Power Supplies............................................................................................................... 12
1 HSF Rear Panel Connector and RA 19-4C Rack Adapter I/O Connector.................................................. 1
2 Power Rating Vs. Temperature.................................................................................................................. 3
3 Mechanical Outline Drawing Of The HSF 300W Power Supply................................................................. 5
4 DIP Switch Configuration............................................................................................................................ 6
5 Front Panel Controls, Indicators and Test Points....................................................................................... 7
6 DIP Switch Settings for Control of Output Voltage ..................................................................................... 8
7 Connections For Remote Voltage Control.................................................................................................. 8
8 DIP Switch Settings for Using RESET button or Remote ON-OFF............................................................ 9
9 DIP switch settings for Optically Coupled Logical Alarm.......................................................................... 10
10 Output Alarm Circuit Optically Isolated..................................................................................................... 11
11 ±PF Power Failure Optocoupler Timing Diagram..................................................................................... 11
12 DIP switch settings for VDC ON/ALARM Power Options......................................................................... 11
1 HSF (M) Rear Connector Pin Assignments ................................................................................................1
2 Output Ratings and Specifications ..............................................................................................................2
3 Power Supply Ratings and Specifications ..................................................................................................3
4 Minimum Conditions for Relay, Meter and LED Operation .........................................................................8

HSF 300W 042315 1
1. INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco HSF 300W Series of
Switching Power Supplies. For service information, write directly to: Kepco Inc., 131-38 Sanford
Avenue, Flushing, New York, 11355, U.S.A. Please state Model Designation and Serial Number of
your HSF Power Supply. This information can be found on the nameplate of the unit.
1.2 DESCRIPTION
The Kepco HSF 300 Watt Series are hot swappable, high frequency switching, plug-in power sup-
plies that are completely interchangeable with the metered HSF Series. Six models may be
selected for outputs of 5V, 12V, 15V, 24V, 28V or 48V. They employ forward conversion and power
factor correction and are designed to operate in a fault tolerant power system with a nominal a-c
input of 100V a-c to 240V a-c (input voltage range 85 to 265 Va-c), 50-60 Hz (input frequency
range 47-440Hz). A built-in current balancing 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 19-4C rack adapters. The
RA 19-4C rack adapter accepts up to four 300W modules. All input/output connections are
through a 24-pin connector that plugs in to the rack adapter. All external connections described in
the following paragraphs are made through the rack adapter’s I/O connector (see Figure 1).
FIGURE 1. HSF REAR PANEL CONNECTOR AND RA 19-4C RACK ADAPTER I/O CONNECTOR
TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS
Signal
Name Pin Function
Output + 1, 2, 4 DC output (+) applied to load.
Output – 3, 5, 6 DC Output (–) applied to load.
SENSE– 7 Sense– connection
IMON+ 8 Current Monitor+ (sense resistor).
SENSE+ 9 Sense+ connection
NO 10 Normally Open contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2.1).
IMON– 11 Current Monitor– (sense resistor).
–COM 12 –Signal Common provides return for REF, pin 15, and RV, pin 18, signals.
NC 13 Normally Closed contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2.1).
AL COM 14 Common contact of alarm relay (see PAR. 3.7.2.1).
REF 15 Reference voltage. When used with RV, pin 18, allows all output voltages of paralleled slave supplies to be
controlled by one voltage adjustment of a master power supply. When REF is connected to RV via an
external trimmer, the external trimmer determines output voltage (see PAR. 3.4.2). Connections are made
via DIP switches (see PAR. 3.1).
3042951
89 7
12 11 10
15
18 16
17
14 13
21 20 19
21
34
56
22
23
24

2HSF 300W 042315
2. SPECIFICATIONS
Table 2 contains specifications and operating limits of individual HSF 300W Series models. Table
3 contains specifications and operating limits common to all HSF 300W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
+PF 16 +Power Fail of open-collector alarm circuit. Used with –PF, pin 19 (see PAR. 3.7.2.2).
CSB 17 Current Share Bus - Used whenever several power supplies are connected in parallel (see PAR. 5.).
RV 18 Remote Voltage - Used with REF, pin 15, for remotely controlling the output voltage (see PAR. 3.4.2)
–PF 19 –Power Fail of open-collector alarm circuit. Used with +PF, pin 16 (see PAR. 3.7.2.2).
+RC 20 +Remote On-off used with –RC, pin 21, to allow remote turn-on turn-off of the unit (see PAR. 3.5)
–RC 21 –Remote On-off used with +RC, pin 20, to allow remote turn-on turn-off of the unit (see PAR. 3.5)
GND 22 AC input ground
N 23 AC Input neutral
L 24 AC input line
TABLE 2. OUTPUT RATINGS AND SPECIFICATIONS
HSF MODEL 5-60 12-27 15-22 24-14 28-12 48-7
Output Volts d-c (nominal) 5 12 15 24 28 48
Output
Adjustment
Range(1)
Using either front panel
trimpot, Voltage source or
external 5K ohm trimpot
(Volts d-c)(2) 0 to 5.5 0 to 13.8 0 to 17.4 0 to 28.2 0 to 33 0 to 52.2
Output Current (nominal) (Amps) 60 27 22 14 12 7
Maximum Output Power (Watts)(3) 300 300 300 300 300 300
Overcurrent Setting (Amps)(4) 63-78 28.4-35.1 23.1-28.6 14.7-18.2 12.6-15.6 7.4-9.1
Short Circuit Current (Amps) 82 35 29 20 17 11
Overvoltage Protection (OVP)
(Volts d-c)(5) 5.7 - 7.0 14.3 - 16.8 18.0 - 24.0 29.3 - 33.6 34.2 - 39.2 54.5 - 59.8
Efficiency
(% typ.) AC Input 100V 72 74 75 78 78 79
AC Input 200V 78 78 79 82 82 83
Power Fac-
tor
(typ.)
AC Input 100V 0.99 0.99 0.99 0.99 0.99 0.99
AC Input 200V 0.95 0.95 0.95 0.95 0.95 0.95
Ripple &
Noise(6)
(mV, p-p)
ripple 80 120 120 150 150 200
ripple noise 120 150 150 200 200 200
(1) To adjust output voltage down to approximately 0V use external voltage source or resistance (see PAR. 3.4.2). Refer to Table
4 for minimum conditions required to maintain proper operation of alarm relay and visual LED indicator.
(2) Using trimpot to attain voltages outside the specified adjustment range may trigger undervoltage (PAR 3.6.4) or overvoltage
(PAR 3.6.1) faults. Recovery is by removing, and after approximately 40 seconds, reapplying AC input power or by reset
(open and close) at ±RC terminals (no delay).
(3) See Figure 2 for power derating.
(4) Square type. Output voltage returns automatically only if cause is removed within 30 seconds (see PAR. 3.6.2).
(5) When overvoltage is detected, output is shut OFF. Recovery is by removing, and after approximately 40 seconds, reapplying
AC input power or by reset (open and close) at ±RC terminals (no delay).
(6) Ripple and noise levels above are satisfied when conditions are 0 to 100% load, 0 to 40°C (load is derated from 40 to 55°C,
see Figure 2), and bandwidth 100MHz.
TABLE 1. HSF REAR CONNECTOR PIN ASSIGNMENTS (CONTINUED)
Signal
Name Pin Function

HSF 300W 042315 3
FIGURE 2. POWER RATING VS. TEMPERATURE
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS
CHARACTERISTIC SPECIFICATION CONDITION/NOTES
Input Voltage Nominal: 100-120V a-c, 200-240V a-c
Range: 85-265V a-c, 110-370V d-c 0 to 100% load, -10 to 40°C
Input Source Frequency Nominal: 50-60 Hz
Range: 47-440 Hz 0 to 100% load, -10 to 40°C
At 440 Hz leakage current exceeds
UL/VDE safety spec. limit.
Input Current: (Maximum Load At
25°C with Nominal Output Voltage) 4.4A rms max. 100 - 120V a-c
2.2A rms max. 200 - 240V a-c
Switching Frequency 140KHz typ. Forward Converter
Input Protection A limiting resistor in series with a resistor fuse (and thyristor circuit) reduces start-up surge.
The internal power supply is protected against shorts by an input fuse. Fuse value 10.0A at
250 Volts
Input Surge cold start, interval > 30
sec (First surge only, not including
current flow into EMI filter)
15A typ., 20A max. first surge 100 - 120V ac
30A typ., 40 max. first surge 200- 240 V ac
Leakage Current: 0.24mA typ., 0.3mA max. 120V a-c, 60Hz per IEC 950 and UL1950
0.31mA typ., 0.38mA max. 240V a-c, 60Hz per IEC 950 and UL1950
Power Factor 0.99 typical Rated output, rated input
Transient Recovery excursion
characteristic ±4% maximum 50% to 100% load,
transient time >50sec
recovery time 1 ms maximum
Stabilization
Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum
Maximum: ±1% (default, 85 to 132V a-c, 170 to 265V a-c
Load Effect ±0.3% Typical, ±2% Maximum (default)
±0.3% Typical, ±0.6% Maximum (see PAR. 3.8) Individual Mode: 0%-100% load change
Current Sharing: 10%-100% load change
Temperature Effect ±0.5% Typical, ±1.0% Maximum –10° to 40°C
Combined Effect ±0.9% Typical, ±1.8% Maximum Source, Load and Temperature
Time Effect 0.2% Typical, 0.5% Maximum 1/2 to 8 hours at 25°C
Start-up Time 280 msec Typical, 350 msec Maximum 100V a-c
150 msec Typical, 210 msec Maximum 240V a-c
Output Hold-up Time 30 msec Typical, 20 msec Minimum. 100V a-c
40 msec Typical, 20 msec Minimum. 240V a-c

4HSF 300W 042315
Overvoltage Protection When the Power Supply goes into an overvoltage condition, the output is cut OFF. See PAR.
3.6.1.
Remote Control ON/OFF: ±RC pins control on/off as follows:
“High”, 2.4V to 24V (or open), unit OFF- Fan Off;
“Low”, 0.0V to 0.4V (or closed), unit ON.
Source current: 1.6mA maximum at low level
Sink current: 1.0 mA maximum at high level.
Must be enabled by DIP switch positions 3
and 4 (see PAR. 3.5).
Operating Temperature: -10 to 40°C (see Figure 2.)
Startup Temperature -10 to -20°C (see Figure 2.)
Storage Temperature: -30°C to +75°C
Withstanding voltage : (at 15-35°C
ambient, 10-85% relative humidity) 2000Va-c for 1 minute. Cutout current is 20mA Between input and ground
500Va-c for 1 minute. Cutout current is 100mA Between output and ground
3000Va-c for 1 minute. Cutout current is 20mA Between input and output terminal
Insulation Resistance: (at 25°C,
65% relative humidity) 100 Megohms minimum (500Vdc) Between output and ground, input and
ground, and input and output,
Humidity: 10% to 95% relative humidity, noncondensing,
Wet Bulb temperature <35°C operating and non-operating
Vibration: 5-10 Hz., 10mm amplitude, 10-55 Hz., accelera-
tion 64.3ft./s2(19.6M/s2) (2g) non-operating 1 hr. on each of 3 axes,
sweep time 10 minutes
Shock: Acceleration: 643.5ft./s2 (196.1M/s2) (20g),
Pulse Duration: 11ms ± 5 msec (non-operating, 1/2 sine pulse, three
shocks on each axis, Power Supply is
fixed on its bottom side)
Safety: Designed to meet UL: 60950; CSA:C22.2 60950; TUV: EN60950.
RoHS Compliance Contact Kepco Sales for further information.
EMC Emission - Conducted: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EMC Emission - Radiated: Designed to meet FCC Class B, VCCI-Class B, EN55011-B, EN55022-B
EMC Emission - Input harmonics
current: Designed to meet EN61000-3-2
EMC Immunity Designed to meet EN61000-6-2
EMC Radiated susceptibility: EN61000-4-3 level 3 normal operation
EMC Conducted susceptibility: EN61000-4-6 level 3 normal operation
ESD: EN61000-4-2, level 4 (HSF 5-60M: level 3) normal operation
Electrical fast transient burst: EN61000-4-4 level 3 normal operation
Surge withstand: EN61000-4-5, level 4 (HSF 5-60M: level 3) No damage
Power Frequency Magnetic Field: EN61000-4-8, level 4 (HSF 5-60M: level 3) normal operation
Voltage dips interruptions and
variations EN61000-4-11 normal operation
Dimensions: 5.22 in. (132.5 mm) x 4.288 in. (108.9 mm) x 16.86 in. (428.2 mm) (See Figure 3)
Mounting: Plug-in
Cooling: Forced air flow - fan
Frame Material/Cover Material: Steel
Weight 8 lbs, 3.7Kgs. maximum
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
CHARACTERISTIC SPECIFICATION CONDITION/NOTES

HSF 300W 042315 5
FIGURE 3. MECHANICAL OUTLINE DRAWING OF THE HSF 300W POWER SUPPLY
3. FEATURES
3.1 DIP SWITCH CONFIGURATION
The HSF 300W Series incorporates two DIP switches, SW1 and SW2 (see Figure 4), which must
be configured before the unit is installed in the rack adapter. The DIP switches control the follow-
ing parameters:
• Positions 1, and 2 allow the output to be controlled either by the front panel Vadj control
(see PAR. 3.4.1) or by remote control using either an external trimpot or voltage source
(see PAR. 3.4.2). These positions can also be configured to allow a master/slave combi-
nation to be controlled either by the front panel Vadj control or by remote control using
either an external trimpot or voltage source (see PAR 3.4).
• Positions 3 and 4 either allow the front panel reset button to be used to reset the unit
after a fault or allow Remote on-off via mechanical switch or logic level (see PAR. 3.5).
• Positions 5 and 6 allows alarm signals to be produced from either internal relay, Form C
contacts (one NO, one NC) or open-collector logical alarm signals (see PAR. 3.7.2).
1.500
[38.1]
0.093 [2.4]
14.667 [372.5]
5.040[128.0]
0.188 [4.8]
0.093 [2.4]
0.093
[2.4]
0.127
[3.2]
0.430 [10.9]
2.065
[52.5]
3.353
[85.2]
0.337 [8.5]
0.085 [2.2]
0.204 [5.2]
0.090 [2.3]
0.943 [23.9]
2.408 [61.2]
0.438 [11.1]
0.394
[10.0]
3.216 [81.7]
0.606 [15.4]
0.690 [17.5]
FRONT VIEW
REAR VIEW
SEE
REAR
VIEW SEE
FRONT
VIEW
NOTES:
1. MATERIAL:
A) BACKPLATE 0.064" THK. ALUM. 5052-H32
B) PCB 0.063" THK FR-4
C) FRONT PANEL 0.090 THK. ALUM. 6061-T6
2. FINISH:
FRONT PANEL -KEPCO DUAL TONE GRAY
3. MODULE IS KEYED AS SHOWN IN DETAIL
4. DIMENSIONS ARE IN INCHES, [DIMENSIONS IN BRACKETS
ARE IN MILLIMETERS].
3043321
15V12V
= PIN PRESENT
= PIN MISSING
KEYING
DETAIL "A"
SEE DETAIL "A"
24V 28V 48V
AIRFLOW
5V
5.218[132.5]
4.288 [108.9]

6HSF 300W 042315
• Position 7 of SW1 either enables (default) or disables using the internal power supply
reference voltage to power the DC ON/ALARM indicator. Position 8 of SW2 either dis-
ables (default) or enables using the HSF output voltage to power the DC ON/ALARM
indicator (requires minimums per Table 4 if enabled) (see PAR 3.8).Only one of these
two must be enabled, the other disabled.
• Position 8 of SW1 either disables (default) or enables the visual alarm indication (see
PAR. 3.7.1).
FIGURE 4. DIP SWITCH CONFIGURATION
3.2 FRONT PANEL ACCESS.
The front panel provides a power ON/OFF switch controlling input power and a "VDC ON" indica-
tor which lights green when the unit is operating. If the unit is connected in a parallel configuration,
the indicator lights red if the unit shuts off automatically, or the POWER switch is set to OFF.
CAUTION: DO NOT repeatedly toggle the power ON/OFF switch as this may cause unit to
fault.
NOTE: The ON/OFF switch must be set to OFF before removing unit from rack adapter.
If remote on-off is not enabled (see PAR. 3.5), the OUTPUT RESET button restores output power
in the event that overcurrent or overvoltage protection has tripped, or thermal overload or fan mal-
function has occurred.
If remote voltage control (see PAR. 3.4.2) is not enabled, the front panel Vadj trimmer (see PAR.
3.4.1) provides adjustment of the output voltage within the limits specified in Table 2; test points
are available at the front panel for monitoring the DC output.
Figure 5 shows the location of all operating controls, indicators and test points followed by an
explanation of each.
3.3 KEYING
Keying of the HSF 300W is established at the factory. The output voltage determines which key
pins are installed (see Figure 3, Detail A). When the proper holes in the rack adapter are blocked
by keying screws installed by the user, only a power supply of the correct voltage can be inserted
in the rack adapter slot. Refer to the RA 19-4C Manual for rack adapter keying instructions.
OFF ON
OFF ON
ALARM LED DISABLE
DC ON PWR BY REF
-PF
+PF
-RC
+RC
RV
REF
3043278
88
8
SW1
SW2
4
6
7
5
2
3
1
4
4
5
6
76
7
5
1
2
32
3
1
DC ON PWR BY OUTP V 8
-RC 4
+PF
-COM
-PF 6
7
5
REF
+RC
RV 2
3
1
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
- DC ON PWR BY REF ENABLED
NOTE: NOT ALL COMPONENTS SHOWN.
DETAIL VIEW
SW1SW2
SEE DETAIL VIEW
TAB

HSF 300W 042315 7
• VDC ON/ALARM indicator. Lights green when unit is operating. When enabled by DIP switch config-
uration, lights red to indicate loss of output voltage in parallel configuration only (see PAR. 3.7.1).
• V.ADJ Output voltage adjustment trimmer: Adjusts output voltage within limits specified in Table 2
(see PAR. 3.4.1). Not functional if remote voltage control is enabled (see PAR. 3.4.2).
• TEST POINT (+, –): Connect to voltmeter to monitor d-c output voltage.
• OUTPUT RESET switch. Used to recycle power in the event of an alarm condition (see PAR. 3.6).
Not functional when remote on/off control is enabled (see PAR. 3.5).
• POWER ON/OFF switch. Applies power to the unit. CAUTION: Power must be OFF before unit is
removed from the rack adapter.
• Retaining Latches (2). Prevents inadvertent removal of unit from rack adapter (see PAR. 3.10).
FIGURE 5. FRONT PANEL CONTROLS, INDICATORS AND TEST POINTS
3.4 OUTPUT VOLTAGE CONTROL
Output Voltage can be controlled from either the front panel (PAR. 3.4.1) or externally using a
trimpot or voltage source (PAR. 3.4.2).
3.4.1 FRONT PANEL VOLTAGE CONTROL
Output voltage can be manually adjusted with the voltage adjustment control, Vadj (see Figure 5
for location) when DIP switches SW1 and SW2 (see Figure 4 for location) are configured as
shown in Figure 6A (factory default) To adjust voltage, first place the unit under an operating load.
Then monitor the (+) and (–) test points on the front panel with a precision voltmeter and turn the
voltage control to the desired operating value. Refer to Table 2 for the recommended Adjustment
Range of all the HSF 300W Models.
3.4.2 REMOTE VOLTAGE CONTROL
For remote voltage control, set positions 1, 2 and 7 as shown in Figure 6B. This removes control
from the front panel Vadj control and allows the output voltage to be adjusted by either an external
trimmer pot (resistance) or by an external variable voltage source connected across the rack
adapter I/O connector pin 12 (RV, Remote Voltage) and pin 10 (–COM, Common) as shown in
Figure 7. At the rack adapter I/O connector use a shielded wire 6.6 feet (2M) maximum in length,
for connection of REF (pin 2), RV (pin 12), and –COM (pin 10) to the trimmer control or external
voltage source.
3043322
VDC ON/ALARM Indicator
V. ADJ Output Voltage Adjustment Trimmer
TEST POINT (+)
TEST POINT (-)
OUTPUT RESET switch
POWER ON/OFF switch
Retaining Latches

8HSF 300W 042315
NOTE:If remote voltage control is not implemented, the factory default for positions 1, 2 and 7 of DIP
switches SW1 and SW2 must be restored (Figure 6A).
FIGURE 6. DIP SWITCH SETTINGS FOR CONTROL OF OUTPUT VOLTAGE
It is possible that overvoltage protection may be triggered if the output voltage is decreased to a low
level very quickly when the power supply is at a low load condition.
RESISTANCE: Connect the external trimmer as shown in Figure 7A. Suggested value for the trim-
mer control is 5K ohms. Referring to Figure 7A, Resistor R is used to obtain minimum output volt-
age required to ensure proper operation of the alarm relay and LED indicator; see Table 4 for
values. NOTE: Output voltage may not adjust to 0V due to residual trimmer resistance.
VOLTAGE. By adjusting an external 0 to 6V voltage source (0 to 5.5V for the 48V model), the HSF
power supply output voltage can be adjusted as specified in Table 2. To ensure proper operation of
the alarm relay, meter and LED indicators, do not adjust external voltage below minimum listed in
Table 4. Connect the voltage source across the RV and –COM pins as shown in Figure 7B.
FIGURE 7. CONNECTIONS FOR REMOTE VOLTAGE CONTROL
3.5 REMOTE ON-OFF
When power is ON at the source, the output may be turned ON or OFF using the ±RC signals if
the remote ON-OFF feature is enabled. Note that when remote ON-OFF is enabled, the RESET
OUTPUT switch does not function. Remote ON-OFF is enabled by setting DIP switch positions 3
and 4 as shown in Figure 8B. The +RC and –RC signals (at the rack adapter I/O connector, pins
15 and 8, respectively) then turn the unit on or off. These pins accept a logic level (2.4V to 24V
TABLE 4. MINIMUM CONDITIONS FOR RELAY, METER AND LED OPERATION
HSF MODEL 5-60(2) 12-27 15-22 24-14 28-12 48-7
Minimum HSF output voltage required for continuous
relay and LED functioning (Volts d-c) 4.0 5.5 6.5 6.5 6.5 6.5
Minimum resistance of Limit resistor R (Figure 7A) in
series with 5K ohm Trimpot to ensure proper operation
of LEDs and relay (Ohms).(1) 5K 1.9K 1.8K 1.1K 930 610
Minimum external voltage (Figure 7B) to ensure proper
operation of LEDs, meter and relay. (Volts d-c).(1) 4.0 2.2 2.16 1.35 1.16 0.67
Voltage source range (Volts d-c) 0 - 6 0 - 6 0 - 6 0 - 6 0 - 6 0 - 5.5
(1) - If operating below minimums listed, see PAR. 3.7.2.2 to implement ±PF alarm signals to monitor power supply status.
(2) -LED brightness of HSF 5-60 is dimmer than other models. This is normal.
OFF
SW1
3043279
COM 7
REF 1
RV 2
7
SW2
1
ON
21
2
OFF 1 REF
2 RV
ON
SW1SW2
7
1
2
OFF ON 1
2
OFF ON
USING Vadj CONTROL
FRONT PANEL VOLTAGE CONTROL
AB
(FACTORY DEFAULT)
REMOTE VOLTAGE CONTROL
OR VOLTAGE SOURCE
USING EXTERNAL TRIMPOT
COM 7
REF 1
RV 2 2 RV
1 REF
TAB