KEPCO HSF 12-53W 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. z131-38 SANFORD AVENUE zFLUSHING, NY. 11355 U.S.A. zTEL [phone] zFAX [phone]
email: [e-mail] zWorld Wide Web: http://www.kepcopower.com
An ISO 9001 Company.
HSF 600 Watts
©2010, KEPCO, INC
P/N 228-1588-M
HSF 600 WATTS
POWER SUPPLY
HSF 600 WATTS
POWER SUPPLY
SINGLE OUTPUT POWER SUPPLIES
SINGLE PHASE, POWER FACTOR CORRECTED
UNIVERSAL AC INPUT
HSF 12-53, HSF 15-43, HSF 24-27,
HSF 28-23, HSF 48-13
HSF 12-53C, HSF 15-43C, HSF 24-27C,
HSF 28-23C, HSF 48-13C
HSF 12-53W, HSF 15-43W, HSF 24-27W,
HSF 28-23W, HSF 48-13W

iHSF 600W 120110
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
1.3 Options............................................................................................................................................................ 1
2 Specifications..................................................................................................................................................... 2
3 Features.......................................................................................................................................................... 6
3.1 DIP Switch Configuration ................................................................................................................................ 6
3.2 Front Panel Access......................................................................................................................................... 7
3.3 Keying ............................................................................................................................................................. 8
3.4 Output Voltage Control ................................................................................................................................... 8
3.4.1 Front Panel Voltage Control......................................................................................................................... 8
3.4.2 Remote Voltage Control............................................................................................................................... 9
3.4.3 W Models ONLY: VDC ON/Alarm Indicator Function ................................................................................ 10
3.5 Remote On-Off.............................................................................................................................................. 10
3.6 Protection Circuits......................................................................................................................................... 11
3.6.1 Overvoltage And Overtemperature Protection ........................................................................................... 11
3.6.2 Overcurrent Setting and Protection............................................................................................................ 11
3.6.3 Fan Failure................................................................................................................................................. 12
3.6.4 Undervoltage.............................................................................................................................................. 12
3.7 Alarm Settings............................................................................................................................................... 12
3.7.1 Visual Alarm. .............................................................................................................................................. 12
3.7.2 Alarm Signals. ............................................................................................................................................ 12
3.7.2.1 Internal Isolated Relay Alarm .................................................................................................................. 12
3.7.2.2 Optically-Coupled Logical Alarm ............................................................................................................. 13
3.8 Local/remote Sensing ................................................................................................................................... 14
3.9 Retaining Latches ......................................................................................................................................... 14
4 Load Connection.............................................................................................................................................. 14
5 Connecting Multiple Power Supplies ............................................................................................................... 15
5.1 Adjusting the Voltage .................................................................................................................................... 15
5.2 Parallel Connections, Standard and C Models ............................................................................................. 15
5.3 Parallel Connections, W Models ................................................................................................................... 15
5.3.1 Minimum Load (W Models) ........................................................................................................................ 16
5.3.2 Voltage Set Restrictions (W Models) ......................................................................................................... 16
1 HSF Rear Panel Connector and RA 19-4C Rack Adapter I/O Connector .................................................. 1
2 Power Rating Vs. Temperature (Input: 95 to 264V a-c).............................................................................. 3
3 Mechanical Outline Drawing Of The HSF 600W Power Supply ................................................................. 6
4 DIP Switch Configuration............................................................................................................................ 7
5 Front Panel Controls, Indicators and Test Points ....................................................................................... 8
6 DIP Switch Settings for Control of Output Voltage ..................................................................................... 9
7 Connections For Remote Voltage Control ................................................................................................ 10
8 DIP switch settings for VDC ON/ALARM Power Options ......................................................................... 10
9 DIP Switch Settings for Using RESET button or Remote ON-OFF .......................................................... 11
10 DIP switch settings for Optically Coupled Logical Alarm .......................................................................... 13
11 Output Alarm Circuit Optically Isolated..................................................................................................... 13
12 ±PF Power Failure Optocoupler Timing Diagram..................................................................................... 14
1 HSF Rear Connector Pin Assignments ......................................................................................................2
2 Output Ratings and Specifications ..............................................................................................................3
3 Power Supply Ratings and Specifications ..................................................................................................4
4 Minimum Conditions for Relay and LED Operation ....................................................................................9
5 W Models: Conditions for VDC ON/ALARM LED Operation Powered by Output .....................................10

HSF 600W 120110 1
1 INTRODUCTION
1.1 SCOPE OF MANUAL
This Operator's Manual covers the installation and operation of the Kepco HSF 600W Series of
Switching Power Supplies. This manual covers only standard (no suffix), Option C and Option W
models. 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 600 Watt Series are hot swappable, high frequency switching, plug-in power sup-
plies. Five models may be selected for outputs of 12V, 15V, 24V, 28V or 48V. They employ for-
ward 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 264 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 600W 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).
1.3 OPTIONS
Option W models are similar to the standard models except that the relay functions at a lower out-
put voltage, and the DC ON indicator functions down to 0V output voltage. W models also do not
require a minimum load for parallel load sharing.
Option C models allow independent monitoring of output current of non-metered models by pro-
viding an integral sense resistor (Rs). Current monitoring is via ±IMON assigned to pins 9 (–) and
1 (+) of the RA 19-4C I/O connector: Monitored Output Current (Amps) = Voltage drop across Rs
(Volts) / Rs (Ohms) (see Table 2), where voltage drop across Rs is measured across ± IMON pins
(requires millivoltmeter, range 0 to 200mV). Accuracy is ±10%; contact Kepco if greater accuracy
is required. There is no isolation between ±IMON, alarm circuit and d-c output. Refer to the RA
19-4C Manual for details.
RoHS-compliant models are indicated by HSF* (e.g., HSF*28-23).
FIGURE 1. HSF REAR PANEL CONNECTOR AND RA 19-4C RACK ADAPTER I/O CONNECTOR
3042951
897
12 11 10
15
18 1617
14 13
21 20 19
21
34
56
22
23
24
1 OUTPUT+OUTPUT+ 2
3 OUTPUT-
5 OUTPUT-
7 S-
8 IMON+
10 NO
OUTPUT+ 4
OUTPUT- 6
S+ 9
IMON - 11
REF 15
CSB 17
+RC 20
13 NC
14 AL COM
16 +PF
19 -PF
AC IN (GND) 22
AC IN (L) 24
23 AC IN (N)
-COM 12
RV 18
-RC 21

2HSF 600W 120110
2 SPECIFICATIONS
Table 2 contains specifications and operating limits of individual HSF 600W Series models. Table
3 contains specifications and operating limits common to all HSF 600W Series Models. These
specifications are at nominal input voltages at 25°C unless otherwise specified.
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+ (not used).
SENSE+ 9 Sense+ connection.
NO 10 Normally Open contact of alarm relay, referenced to AL COM, pin 14 (see PAR. 3.7.2).
IMON– 11 Current Monitor– (not used).
–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).
AL COM 14 Common contact of alarm relay (see PAR. 3.7.2).
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).
+PF 16 +Power Fail of open-collector alarm circuit. Used with –PF, pin 19 (see PAR. 3.7.2).
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).
+RC 20 +Remote On-off used with –RC, pin 21, to allow remote turn-on turn-off of the unit (see PAR. 3.4.3).
–RC 21 –Remote On-off used with +RC, pin 20, to allow remote turn-on turn-off of the unit (see PAR. 3.4.3).
GND 22 AC input ground.
N 23 AC Input neutral.
L 24 AC input line.

HSF 600W 120110 3
FIGURE 2. POWER RATING VS. TEMPERATURE (INPUT: 95 TO 264V A-C)
TABLE 2. OUTPUT RATINGS AND SPECIFICATIONS
MODEL HSF 12-53 HSF 15-43 HSF 24-27 HSF 28-23 HSF 48-13
Output Volts d-c (nominal) 12 15 24 28 48
Output
Adjustment
Range(1)
Using front panel trim pot or
external 5K ohm Trimpot
(Volts d-c)(2) 0 - 13.8 0 - 17.4 0 - 28.2 0 - 33 0 - 52.2
Using Voltage source
(Volts d-c) 0 - 13.8 0 - 17.4 0 - 28.2 0 - 33 0 - 52.2
Output Current (nominal) (Amps d-c) 53 43 27 23 13
Maximum Output Ratings (3) (Watts) 636 645 648 644 624
Overcurrent Setting (Amps d-c)(4) 55.6-68.9 45.1-55.9 28.3-35.1 24.1-29.8 13.7-16.9
Short Circuit Current (Amps d-c) 65 55 35 29 19
Overvoltage Protection (OVP) (Volts d-c)(5) 14.3 - 16.8 18.0 - 21.0 29.3 - 33.6 34.2 - 39.2 54.5 - 59.8
Efficiency
% typical
AC Input 100V 80 81 82 82 84
AC Input 200V 84 85 86 86 87
Power Factor
(typ.)
AC Input 100V 0.99 0.99 0.99 0.99 0.99
AC Input 200V 0.95 0.95 0.95 0.95 0.95
Ripple &
Noise(6)
(mV, p-p)
ripple 180 180 220 220 220
ripple noise 220 220 320 320 320
Sense Resistor (IMON) values (Ohms)(7) 0.002 0.005 0.01 0.01 0.02
(1) Refer to Table 4 for minimum conditions required to maintain proper operation of alarm relay and visual LED indicator.
(2) Output voltage may not adjust to 0V due to residual trimmer resistance.
(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.
(7) Option C only.
NOTE:
Safety agency approvals
apply only to operation
between -10°C and 40°C.

4HSF 600W 120110
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS
CHARACTERISTIC SPECIFICATION CONDITION/NOTES
Input Voltage Nominal: 100-120V a-c, 200-240V a-c
Range: 85-264V a-c (1), 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)
8.4A rms max. 100 - 120V a-c
4.2A 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 15.0A at
250 Volts
Input Surge cold start, interval > 30
sec ( First surge only, not including
current flow into EMI filter )
15A typ., 30A max. first surge 100 - 120V ac
30A typ., 60 max. first surge 200- 240 V ac
Leakage Current: 0.45mA typ., 0.75mA max. 120V a-c, 60Hz per IEC 950 and UL1950
0.60mA typ., 0.75mA max. 240V a-c, 60Hz per IEC 950 and UL1950
Power Factor 0.99 typical 100V a-c, max load, nominal output,
per EN 61000-3-2
0.95 typical 200V a-c, max load, nominal output
per EN 61000-3-2
Transient Recovery excursion
characteristic
±4% maximum 50% to 100% load,
transient time >50µsec
recovery time 1 ms maximum
Stabilization
Source Effect (min - max) ±0.1% Typical, ±0.2% Maximum 85 to 132V a-c, 170 to 264V a-c
Load Effect ±0.3% Typical, ±0.6% Maximum 0%-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
100 msec Typical, 150 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
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. 3.4.3).
Operating Temperature: -10 to 40°C (1) (see Figure 2.)
Startup Temperature -10 to -20°C (see Figure 2.)
Storage Temperature: -30°C to +75°C
(1) For input voltage between 85 to 95V a-c maximum operating temperature is 35°C.

HSF 600W 120110 5
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: UL 60950-1, 1st Edition, 2007-10-31; CSA C22.2 No. 60950-1-03, 1st Edition, 2006-07;
EN 60950
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 normal operation
Electrical fast transient burst: EN61000-4-4 level 3 normal operation
Surge withstand: EN61000-4-5, level 4 No damage
Power Frequency Magnetic Field: EN61000-4-8, level 4 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 9 lbs, 4.1Kgs. maximum
TABLE 3. POWER SUPPLY RATINGS AND SPECIFICATIONS (CONTINUED)
CHARACTERISTIC SPECIFICATION CONDITION/NOTES

6HSF 600W 120110
FIGURE 3. MECHANICAL OUTLINE DRAWING OF THE HSF 600W POWER SUPPLY
3FEATURES
3.1 DIP SWITCH CONFIGURATION
The HSF 600W 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. 3.4.3).
4.288 [108.9]
5.218[132.5]
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].
3042952
15V12V
= PIN PRESENT
= PIN MISSING
KEYING
DETAIL "A"
SEE DETAIL "A"
24V 28V 48V
AIRFLOW

HSF 600W 120110 7
• 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).
• For standard or C models position 8 of SW1 either disables (default) or enables the
visual alarm indication (see PAR. 3.7.1). For W models positions 7 and 8 determine
whether the DC ON indicator is powered internally or from the HSF output voltage (see
PAR. 3.4.3).
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. 3.4.3), the OUTPUT RESET button restores output
power in the event that overcurrent or overvoltage protection has tripped, or thermal overload or
fan malfunction 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.
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
- DC ON PWR BY REF V ENABLED
3043031
SEE DETAIL VIEW
DC ON PWR BY REF
ALARM LED DISABLE
44-RC
SW2
DC ON PWR BY OUTP V 8
-COM 7
-PF
+PF 5
6
88
8
SW1
6
77
55
66-PF
7
5+PF
-RC
+RC
4
3
RV
REF
2
1
OFF
3
4
3
1
22
1
2
3+RC
1
RV
REF
OFF
ON ON
SEE APPLICABLE
DESCRIPTION
FOR STANDARD
C OR W MODELS.
NOTE: NOT ALL COMPONENTS SHOWN.
DETAIL VIEW
SW2 SW1
REF11
1
REF 1
-NOT USED
ALARM LED DISABLE
SW1
SW2
W Models
+PF 5
-COM 7
N/A 8
-PF 6
+RC 3
-RC 4
RV 2
+PF
5
5
5
7
7
88
66
7
8
-PF
6
3
3
44
22
3+RC
-RC
4
RV
2
FACTORY DEFAULT SETTING:
- FRONT PANEL VADJ CONTROL
- RELAY ALARM SELECTED
- VISUAL ALARM DISABLED
- REMOTE ON-OFF DISABLED
Standard and C Models
ON
OFF OFF ON

8HSF 600W 120110
3.3 KEYING
Keying of the HSF 600W 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.
1. VDC ON/ALARM indicator. Lights green when unit is operating. Can be configured by DIP
switch to light red to indicate loss of output voltage in parallel configurations. W models allow
selection of whether indicator is powered by output or will function down to 0V. (see PAR.
3.7.1).
2. 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).
3. DC output test points (+, –): Connect to voltmeter to monitor output voltage.
4. 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. 3.4.3).
5. POWER ON/OFF switch. Applies power to the unit. CAUTION: Power must be OFF before
unit is removed from the rack adapter.
6. Retaining Latches (2). Prevents inadvertent removal of unit from rack adapter (see PAR.
3.9)
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.
3042857
1
2
3
4
3
5
6