XT Series
Programmable DC
Power Supply
Operation Manual
TM-XTOP-01XN Rev D www.programmablepower.com
About AMETEK
AMETEK Programmable Power, Inc., a Division of AMETEK, Inc., is a global leader in the design
and manufacture of precision, programmable power supplies for R&D, test and measurement,
process control, power bus simulation and power conditioning applications across diverse
industrial segments. From bench top supplies to rack-mounted industrial power subsystems,
AMETEK Programmable Power is the proud manufacturer of Elgar, Sorensen, California
Instruments and Power Ten brand power supplies.
AMETEK, Inc. is a leading global manufacturer of electronic instruments and electromec hanical
devices with annualized sales of $2.5 billion. The Company has over 11,000 colleagues working
at more than 80 manufacturing facilities and more than 80 sales and service centers in the United
States and around the world.
Trademarks
AMETEK is a registered trademark of AMETEK, Inc. Sorensen is a trademark owned by AMETEK,
Inc. Other trademarks, registered trademarks, and product names are the property of their
respective owners and are used herein for identification purposes only.
Notice of Copyright
XT Series Programmable DC Power Supply Operation Manual
Power, Inc. All rights reserved.
© 2007 AMETEK Programmable
Exclusion for Documentation
UNLESS SPECIFICALLY AGREED TO IN WRITING, AMETEK PROGRAMMABLE POWER, INC.
(“AMETEK”):
(a) MAKES NO WARRANTY AS TO THE ACCURACY, SUFFICIENCY OR SUITABILITY OF ANY
TECHNICAL OR OTHER INFORMATION PROVIDED IN ITS MANUALS OR OTHER
DOCUMENTATION.
(b) ASSUMES NO RESPONSIBILITY OR LIABILITY FOR LOSSES, DAMAGES, COSTS OR
EXPENSES, WHETHER SPECIAL, DIRECT, INDIRECT, CONSEQUENTIAL OR INCIDENTAL,
WHICH MIGHT ARISE OUT OF THE USE OF SUCH INFORMATION. THE USE OF ANY SUCH
INFORMATION WILL BE ENTIRELY AT THE USER’S RISK, AND
(c) REMINDS YOU THAT IF THIS MANUAL IS IN ANY LANGUAGE OTHER THAN ENGLISH,
ALTHOUGH STEPS HAVE BEEN TAKEN TO MAINTAIN THE ACCURACY OF TH E
TRANSLATION, THE ACCURACY CANNOT BE GUARANTEED. APPROVED AMETEK CONTENT
IS CONTAINED WITH THE ENGLISH LANGUAGE VERSION, WHICH IS POSTED AT
WWW.PROGRAMMABLEPOWER.COM.
Date and Revision
April 2009 Revision D
Part Number
TM-XTOP-01XN
Contact Information
Telephone: 800 733 5427 (toll free in North America)
858 450 0085 (direct)
Fax: 858 458 0267
Email: sales@programmablepower.com
service@programmablepower.com
Web: www.programmablepower.com
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G
G
Important Safety Instructions
Before applying power to the system, verify that your product is configured properly for your
particular application.
WARNIN
WARNIN
Only qualified personnel who deal with attendant hazards in power supplies, are allowed to perform
installation and servicing.
Ensure that the AC power line ground is connected properly to the Power Rack input connector or
chassis. Similarly, other power ground lines including those to application and maintenance
equipment must be grounded properly for both personnel and equipment safety.
Always ensure that facility AC input power is de-energized prior to connecting or disconnecting any
cable.
In normal operation, the operator does not have access to hazardous voltages within the chassis.
However, depending on the user’s application configuration, HIGH VOLTAGES HAZARDOUS TO
HUMAN SAFETY may be normally generated on the output terminals. The customer/user must
ensure that the output power lines are labeled properly as to the safety hazards and that any
inadvertent contact with hazardous voltages is eliminated.
Guard against risks of electrical shock during open cover checks by not touching any portion of the
electrical circuits. Even when power is off, capacitors may retain an electrical charge. Use safety
glasses during open cover checks to avoid personal injury by any sudden component failure.
Neither AMETEK Programmable Power Inc., San Diego, California, USA, nor any of the subsidiary
sales organizations can accept any responsibility for personnel, material or inconsequential injury,
loss or damage that results from improper use of the equipment and accessories.
Hazardous voltages may be present when covers are removed. Qualified
personnel must use extreme caution when servicing this equipment.
Circuit boards, test points, and output voltages also may be floating above
(below) chassis ground.
The equipment used contains ESD sensitive parts. When installing
equipment, follow ESD Safety Procedures. Electrostatic discharges might
cause damage to the equipment.
SAFETY SYMBOLS
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Product Family: XT Series Programmable DC Power Supply
Warranty Period: Five Years
WARRANTY TERMS
AMETEK Programmable Power, Inc. (“AMETEK”), provides this written warranty covering the
Product stated above, and if the Buyer discovers and notifies AMETEK in writing of any defect in
material or workmanship within the applicable warranty period stated above, then AMETEK may,
at its option: repair or replace the Product; or issue a credit note for the defective Product; or
provide the Buyer with replacement parts for the Product.
The Buyer will, at its expense, return the defective Product or parts thereof to AMETEK in
accordance with the return procedure specified below. AMETEK will, at its expense, deliver the
repaired or replaced Product or parts to the Buyer. Any warranty of AMETEK will not apply if the
Buyer is in default under the Purchase Order Agreement or where the Product or any part
thereof:
• is damaged by misuse, accident, negligence or failure to maintain the same as
specified or required by AMETEK;
• is damaged by modifications, alterations or attachments thereto which are not
authorized by AMETEK;
• is installed or operated contrary to the instructions of AMETEK;
• is opened, modified or disassembled in any way without AMETEK’s consent; or
• is used in combination with items, articles or materials not authorized by AMETEK.
The Buyer may not assert any claim that the Products are not in conformity with any warranty
until the Buyer has made all payments to AMETEK provided for in the Purchase Order Agreement.
PRODUCT RETURN PROCEDURE
1. Request a Return Material Authorization (RMA) number from the repair facility (must be
done in the country in which it was purchased):
• In the USA, contact the AMETEK Repair Department prior to the return of the
product to AMETEK for repair:
Telephone: 800-733-5427, ext. 2295 or ext. 2463 (toll free North America)
858-450-0085, ext. 2295 or ext. 2463 (direct)
• Outside the United States, contact the nearest Authorized Service Center
(ASC). A full listing can be found either through your local distributor or our
website, www.programmablepower.com, by clicking Support and going to the
Service Centers tab.
2. When requesting an RMA, have the following information ready:
• Model number
• Serial number
• Description of the problem
NOTE: Unauthorized returns will not be accepted and will be returned at the shipper’s expense.
NOTE: A returned product found upon inspection by AMETEK, to be in specification is subject to
an evaluation fee and applicable freight charges.
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vi
About This Manual
This Operating Manual contains operation instructions for the XT Series of high
performance, switching, laboratory power supplies, available in several voltage
models at 60 watts. It provides information on features and specifications,
installation procedures, and basic functions testing, as well as operating procedures
for using both standard and multiple supply functions.
Who Should Use This Manual
This manual is designed for the user who is familiar with basic electrical laws,
especially as they apply to the operation of power supplies. This implies a
recognition of Constant Voltage and Constant Current operating modes and the
control of input and output power , as well as the observance of safe techniques while
calibrating, making supply connections and/or any changes in configuration.
Main Section s
Section 1 Features and Specifications Describes the power supply, lists its
features, and provides tables of specifications.
Section 2 Installation Reviews safety and inspection procedures, and provides
procedures for basic setup. Also includes directions for the testing of basic functions.
Section 3 Load Connection and Sensing Provides procedures for connecting
the load, grounding, and remote sensing.
Section 4 Operation Describes standard operation (Constant Voltage and
Constant Current), and series, parallel, and split supply operation.
vii
viii
Contents
Section 1.
Features and
Specifications
Section 2.
Installation
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Front Panel Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Rear Panel Connectors and Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Additional Electrical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Input Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Mechanical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Chassis Dimensions and Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Single Output Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Dual Output Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Triple Output Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Quad Output Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Basic Setup Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Initial Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Periodic Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Returning Power Supplies to the Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Return Material Authorization Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Packaging for Shipping or Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Rack Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Location and Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
AC Input Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
AC Input Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Functional Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Power-on Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Voltage Mode Operation Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Current Mode Operation Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Section 3.
Load
Connection
and Sensing
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Load Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Load Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Making Load Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
ix
Connecting Multiple Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Local Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Remote Sensing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Section 4.
Operation
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Constant Voltage Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Constant Current Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Automatic Mode Crossover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Constant Power Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Using Multiple Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Connecting Multiple Supplies in Series (Voltage Mode Only). . . . . . . . . . . . . . 35
Connecting Multiple Supplies in Parallel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Split Supply Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
x Operating Manual for XT Series Power Supply
Section 1. Features and Specifications
Introduction
The XT Series of linear, regulated DC power supplies provides reliable, high
performance solutions for a broad range of laboratory, development and system
applications. The series consists of seven basic models that may be purchased as
single units or combined as dual, triple, or quadruple configurations containing any
combination of models. (See the chart below for a list of available models.)
Low output noise and ripple, excellent line and load regulation, and a wide variety
of options, including analog, RS232 standard, or IEEE-488 controlled programming,
make the XT Series the first choice in flexible DC power system design.
Table 1.1 60 Watt Series Models
Model Output Voltage Output Current
7-6 0-7 V 0-6 A
15-4 0-15 V 0-4 A
20-3 0-20 V 0-3 A
30-2 0-30 V 0-2 A
60-1 0-60 V 0-1 A
120-0.5 0-120 V 0-0.5 A
250-0.25 0-250 V 0-0.25 A
11
Features and Specifications
Features
Features
• The power supply delivers simultaneous digital displays for both voltage and
current, and bar graph displays for monitoring transient changes, which gives the
user the benefit of continuous, up-to-date information.
• Ten-turn voltage control permits high resolution setting of the output voltage.
• Current limit is fully adjustable from zero to the rated output with a single turn
control.
• The automatic crossover system allows the power supply to automatically
switch operating modes into current or voltage mode.
• Impedance-switched remote sensing lets operators display the voltage at the load
with no switch ambiguity.
• Multiple units can be connected in parallel or series to produce greater diversity.
• Short-circuit-proof power outlets give greater operating safety.
• These power supplies (available in single, dual, triple and quad outputs) can be
combined with one or more 300 watt series power supplies to create mixed units
that are ideal for high precision applications.
Options and Accessories
• Internal Analog Programming (APG) interface for analog signal control of
voltage and current, overvoltage protection (OVP), master/slave output tracking,
and remote ON/OFF.
• Internal RS-232 interface for serial instrument programming using RS-232
protocol.
• Internal GPIB interface for complete remote digital programming. IEEE-488
standard.
• Optional 200-250 Vac input (Options AC220, AC230 and AC240). Standard is
115 Vac. Optional AC input cords for use in different countries.
• Ten-turn current potentiometer (Option M11). Rack mount kit (Option RM).
• Locking voltage and/or current adjust knobs (Option M13A)
• Optional 115-230 Vac switching unit (Option M43)
12 Operating Manual for XT Series Power Supply
Front Panel Controls
See Figure 1.1 to review the controls, LEDs, and meters located on the unit’s front
panel.
Features and Specifications
Front Panel Controls
Remote Programming LED (PGM)
(For units with APG installed.
See also Figure 1.2).
Shutdown LED (S/D)
(For units with APG installed.)
OVP Shutdown (OVP)
(For units with APG installed.)
OVP Adjust Potentiometer (OVP ADJ)
(For units with APG installed.)
Voltage Mode
Indicator (Green LED)
Voltage Control Knob
(10-turn standard)
AC Power Switch
Safety Ground
Binding Post (green or gray)
Positive (+) Output Binding Post (Red)
Figure 1.1 Front Panel Controls
REGULATED DC POWER SUPPLY
P
G
M
S
/
D
O
V
P
OVP
ADJ
VOLTAGE CURRENT
POWER
MODE
Digital Display of DC Output
(Volts, Amperes)
Analog Bar Graph Display
Current Limit Mode
Indicator (Red LED)
Current Limit Adjust Knob
(1-turn standard)
Positive (+) Sense
Connection (Banana Jack)
SENSE
Return (−) Sense
Connection (Banana Jack)
Return (−) Output Binding
Post (Black)
13
Features and Specifications
)
Rear Panel Connectors and Outputs
Remote Programming LED (REM)
OVP Shutdown (OVP)
Figure 1.2 Remote Programming Interface Indicators (For units with a digital programming interface installed.)
Rear Panel Connectors and Outputs
See Figure 1.3 for the connectors and outputs available at the rear panel.
Shutdown LED (SRQ)
OVP Adjust Potentiometer (OVP ADJ
Blank Subplate
(Replaced if a
programming option
is installed.)
AC Input Connector
Output Terminal Block
Figure 1.3 Rear Panel.
14 Operating Manual for XT Series Power Supply
Electrical Specifications
Specifications are warranted over a temperature range of 0 to 30 °C with default
local sensing. Above 30 °C, derate output linearly to zero at 70 °C. Specifications are
subject to change without notice.
Table 1.2 Electrical Specifications for 7.5 V to 30 V Models
Models 7-6 15-4 20-3 30-2
Output Ratings:
Output Voltage
Output Current
Output Power
Line Regulation:
Voltage (0.01% of Vmax + 2 mV)
Current (0.01% of Imax + 250 uA)
Load Regulation:
Voltage (0.01% of Vmax + 2 mV)
Current (0.01% of Imax + 250 uA)
Meter Accuracy:
Voltage (1% of Vmax + 1 count)
Current (1% of Imax + 1 count)
Stability:
Temperature Coefficient
Front Panel Voltage:
1. For input voltage variation over the AC input voltage range, with constant rated load.
2. For 0 to 100% load variation, with constant nominal line voltage, over 15-minute time
3. Maximum drift over 8 hours with constant line, load, and temperature, after 30-minute
4. Change in output per °C change in ambient temperature, with constant line and load,
3
Voltage (0.02% of Vmax)
Current (0.03% of Imax)
Voltage (0.015% of Vmax/°C)
Current (0.02% of Imax/°C)
Control Resolution
(0.02% of V max) 1.4mV 3mV 4mV 6mV
duration following load step.
warm-up at current setpoint.
and after 30-minute warm-up at current setpoint.
Features and Specifications
Electrical Specifications
0-7 V
0-6 A
42 W
1
2.7 mV
0.85 mA
2
2.7 mV
0.85 mA
0.08 V
0.07 A
1.4 mV
1.8 mA
4
1.05 mV
1.2 mA
0-15 V
0-4 A
60 W
3.5 mV
0.65 mA
3.5 mV
0.65 mA
0.25 V
0.05 A
3mV
1.2 mA
2.25 mV
0.8 mA
0-20 V
0-3 A
60 W
4mV
0.55 mA
4mV
0.55 mA
0.3 V
0.04 A
4mV
0.9 mA
3mV
0.6 mA
0-30 V
0-2 A
60 W
5mV
0.45 mA
5mV
0.45 mA
0.4 V
0.03 A
6mV
0.6 mA
4.5 mV
0.4 mA
15
Features and Specifications
Electrical Specifications
Table 1.3 Electrical Specifications for 60 V to 250 V Models
Models 60-1 120-0.5 250-0.25
Output Ratings:
Output Voltage
Output Current
Output Power
Line Regulation:
Voltage (0.01% of Vmax + 2 mV)
Current (0.01% of Imax + 250 uA)
Load Regulation:
Voltage (0.01% of Vmax + 2 mV)
Current (0.01% of Imax + 250 uA)
Meter Accuracy:
Voltage (1% of Vmax + 1 count)
Current (1% of Imax + 1 count)
Stability:
Voltage (0.02% of Vmax)
Current (0.03% of Imax)
Temperature Coefficient
Voltage (0.015% of Vmax/°C)
Current (0.02% of Imax/°C)
Front Panel Voltage:
Control Resolution
(0.02% of V max) 12mV 24mV 50mV
1. For input voltage variation over the AC input voltage range, with constant
rated load.
2. For 0 to 100% load variation, with constant nominal line voltage, over
15-minute time duration following load step.
3. Maximum drift over 8 hours with constant line, load, and temperature, after
30-minute warm-up at current setpoint.
4. Change in output per °C change in ambient temperature, with constant line
and load, and after 30-minute warm-up at current setpoint.
0-60 V
0-1 A
60 W
1
8mV
0.35 mA
2
8mV
0.35 mA
0.7 V
0.02 A
3
12 mV
0.3 mA
4
9mV
0.2 mA
0-120 V
0-0.5 A
60 W
14 mV
0.3 mA
14 mV
0.3 mA
2.2 V
0.006 A
24 mV
0.15 mA
18 mV
0.1 mA
0-250 V
0-0.25 A
60 W
27 mV
0.275 mA
27 mV
0.275 mA
3.5 V
0.003 A
50 mV
0.075 mA
37.5 mV
0.05 mA
16 Operating Manual for XT Series Power Supply
Additional Electrical Specifications
Features and Specifications
Additional Electrical Specifications
Voltage Mode Transient Response
Time
Time delay from power on until
output stable
Output Noise and Ripple
Output Noise and Ripple
(250 V unit only)
1. RMS value measured at bandwidth of 20Hz to 300kHz, at the rear panel terminals; points of
Input Conditions
Standard AC Input Voltage 115 Vac ± 10%, 57-63 Hz
Option M1 (Factory installed) 110 Vac ± 10%, 47-63 Hz
Option AC220 220 Vac ± 10%, 47-63 Hz
Option AC230 230 Vac ± 10%, 47-63 Hz
Option AC240 240 Vac ± 10%, 47-63 Hz
<100 μs recovery to 0.05% band, for ± 50%
load change in the range of 25% to 100% of
the rated load.
1.5 s maximum
1
<1 mVrms (voltage mode)
<2 mArms (current mode)
1
<5 mVrms (voltage mode)
<1 mArms (current mode)
measurement are the positive (+) and return (-) output terminal screws of the output terminal
block.
AC Input Current at 115 Vac,
60 Hz
Electrical Characteristics
Output Hold-up Time approx. 10 ms at nominal line (full load)
Maximum Voltage Differential
from output to safety ground
Insulation Resistance Input to chassis: >120 MΩ
Isolation Voltage
(Output not to exceed ±400 Vdc
from chassis potential.)
Single unit: 1.2 A
Dual unit: 2.4 A
Triple unit: 3.6 A
Quad unit: 4.8 A
±400 Vdc
Output to chassis: >120 MΩ
Input to output: 1350 Vac
17
Features and Specifications
Environmental Specifications
Maximum Remote Sense Line
Drop Compensation. (Line drop
must be deducted from the supply’s
maximum output voltage.)
Environmental Specifications
Operating Ambient Temperature 0 to 30 °C with default local sensing. Above
Storage Temperature Range –55° to 85 °C
Humidity Range Up to 80% RH non-condensing
Operating Altitude Up to 6,500 feet (2000 m)
Storage Altitude Up to 50,000 feet (15 000 m)
Mechanical Specifications
Front Panel Voltage and Current
Control
Front Panel Voltage Control
Resolution
0.5 V/line
30 °C, derate output linearly to 0 at 70 °C.
10-turn voltage and 1-turn current
potentiometers (10-turn current control
optional)
0.02% of maximum voltage
Front Panel AC Input Power Switch Push ON/push OFF switch
Front Panel Voltage and Current
Meters
AC Input Connector Type IEC 320 Connector, appropriate power cord for
Front Panel Output Connector Three binding posts: positive (+),
Rear Panel Output and Sense
Connector
Chassis Ground Front panel binding post and power cord safety
Cooling Convection cooled. Air enters the unit from the
Mounting Optional rack for mounting several units in a
18 Operating Manual for XT Series Power Supply
Independent 3-digit green numeric LED
display and analog bar graph displays for
current and voltage. For meter accuracy, see
Table 1.2.
destination country.
negative (–), and ground.
Four terminal block.
ground.
bottom and lower sides and exits from the
upper sides and top.
standard rack. Can be combined with 300 watt
series units. See
“Rack Mounting” on page 24.
Approvals (up to 120 Vdc output) CSA certified to CSA C22.2 No. 107.1
Chassis Dimensions and Weight
Single Output
Unit
Dual Output
Unit
Height 5.25 in. (132 mm)
Width 4.25 in. (109 mm)
Depth 11.7 in. (297 mm)
Weight 7.7 lb. (3.5 kg)
Height 5.25 in. (132 mm)
Features and Specifications
Chassis Dimensions and Weight
FCC Part 15B and Industry Canada Class A
CE Marked for Low Voltage Directive and
EMC Directive (Class A emissions)
Triple Output
Unit
Quad Output
Unit
Width
8.5 in. (216 mm)
Depth 11.7 in.(297 mm)
Weight
14.2 lb. (6.5 kg)
Height 5.25 in. (132 mm)
Width
12.75 in. (325 mm)
Depth 11.7 in. (297 mm)
Weight
26.3 lb. (6.5 kg)
Height 5.25 in. (132 mm)
Width
17.0 in. (436 mm)
Depth 11.7 in. (297 mm)
Weight
36.7 lb. (16.7 kg)
19
Features and Specifications
Chassis Dimensions and Weight
20 Operating Manual for XT Series Power Supply
Section 2. Installation
Introduction
This section provides recommendations and procedures for inspecting, installing,
and testing the power supply.
Basic Setup Procedure
Table 2.1 Basic Setup Procedure
Step# Description Action Reference
1 Inspection Perform an initial physical
inspection of the supply.
2 Installation Install the supply and ensure
adequate ventilation.
3 Test Perform functional tests for
voltage mode operation,
current mode operation, and
front panel controls.
“Initial Inspection” on page 21
“Location and Ventilation” on
page 22
“Functional Tests” on page 23
Initial Inspection
Verify that the power supply was shipped with an IEC power cord set appropriate to
the destination country and an operating manual. When you first receive your unit,
perform a quick physical check.
1. Inspect the unit for scratches and cracks, broken switches, connectors, terminals,
2. Have a service technician check the unit if you suspect internal damage.
If the unit is damaged, save all packing materials and notify the carrier immediately.
Periodic
Cleaning
No routine servicing of the power supply is required except for periodic cleaning.
Whenever a unit is removed from operation, clean the outside surfaces with a weak
solution of soap and water. If required, use low-pressure compressed air to blow dust
from in and around components on the printed circuit boards.
and missing accessories.
21
Installation
!
Rack Mounting
Rack Mounting
Use the power supply in benchtop or in rack-mounted applications.
WARNING
Ensure that any mounting screws do not protrude more than 1/8 in. (3.0 mm) into
the bottom of the unit.
The power is supply is designed to fill 1/4 of a standard 19 in (483 mm) equipment
rack.
Dual and quad configurations can be combined with 300 watt series models for
custom applications. Contact the manufacturer about the rack mount kit (Option
RM).
Location and Ventilation
Whether you place the power supply in a rack or on a bench, allow cooling air to
reach the ventilation inlets on the bottom and sides of the unit. Ensure that
rack-mounted supplies have 1 U (1.75. in) above and below units. Any ventilation
space around the supply will further lower internal operating temperatures.
See “Environmental Specifications” on page 18, for the operating altitude
specification and the operating ambient temperature range measured at the unit case.
AC Input Power Connection
WARNING
There is a potential shock hazard if the power supply chassis and cover are not
connected to an electrical ground via the safety ground in the AC input connector.
Ensure that the power supply is connected to a grounded AC outlet with the
recommended AC input connector configured for the available line voltage as
described in this section.
CAUTION
When power switch is turned on, output voltage or current previously set will be
applied to loads.
The AC input connector is a standard IEC 320 male connector located on the power
supply’s rear panel.
22 Operating Manual for XT Series Power Supply
AC Input
Cord
Installation
Functional Tests
Table 2.2 Operational AC Input Voltage Ranges and Frequency
AC Voltage Range Frequency
104-127 Vac 1
200-250 Vac 1φ (AC220 / AC230 / AC240 options)
110 Vac (option M1)
115-230 Vac switching unit (option M43)
WARNING
The AC input cord is the disconnect device for the power supply. The plug must
be readily identifiable by and accessible to the operator. The input cord must be
no longer than 9.85 feet (3 m).
φ (standard) 57-63 Hz
47-63 Hz
The AC input cord that we provide is appropriate to the destination country. If you
require a special cord, call us.
Functional Tests
These functional test procedures include power-on and front panel function checks
as well as voltage and current mode operation checks.
Power-on
Check
1. Ensure that the front panel power switch is in the extended (OFF) position and
2. Ensure that the AC line voltage is within operating range.
3. Plug the line cord into a grounded AC outlet.
4. Push the power switch to turn on the power supply.
After a short power-on delay, the display and the red current mode LED lights. The
meter reading remains at zero.
For more about standard operations, see Section 4, “Operation”.
the voltage and current controls are in their fully counter-clockwise positions.
Rev C 23
Installation
Functional Tests
Voltage Mode
Operation
Check
Current Mode
Operation
Check
1. Ensure that the front panel voltage and current control are turned fully
counter-clockwise.
2. Set the power switch to ON.
3. Rotate the current control one half-turn clockwise. Slowly rotate the voltage
control clockwise and observe the digital meter. Minimum control range should
be from zero to maximum rated output. Observe the bar graph meter to see that
it tracks as the voltage rises. Verify that the voltage mode indicator light is ON.
4. Set the power switch to OFF.
1. Ensure that the front panel power switch is set to OFF.
2. Rotate the voltage and current controls fully counter-clockwise.
3. Rotate the voltage control one half-turn clockwise.
4. Connect a short circuit across the output terminals. Use leads of sufficient
current carrying capacity.
5. Set the power switch to ON.
6. Rotate the current control slowly clockwise. The control range should be from
zero to the maximum rated output. Also check that the current bar graph meter
follows the rise in current and that the current mode indicator light is ON.
7. Set the power switch to OFF.
24 Operating Manual for XT Series Power Supply
Section 3. Load Connection and Sensing
!
Introduction
This section covers single and multiple load connection, constant voltage and
constant current operating modes, and alternate power supply configurations such as
series and parallel connections.
Load Connection
WARNING
There is a potential shock hazard at the load when using a power supply with an
output greater than 40 V. Take appropriate precautions to protect personnel
against accidental contact with hazardous voltages. Also ensure that the
insulation rating of the load wiring and circuitry is greater than or equal to the
maximum voltages to ground being applied.
CAUTION
When making load connections, be sure to observe correct polarity locations or
damage to the power supply may occur.
You can obtain reliable performance from your power supply if you take certain
basic precautions when making load connections.
To obtain a stable, low noise output, pay attention to factors such as conductor
ratings, system grounding techniques, and the way that you make AC input, DC
output, and remote sensing connections. Use a conductor size that satisfies the
current rating requirements. To ove r come impedance and coupling effects, we
recommend larger gauge wire and shorter leads.
Where positive load transients such as back EMF (electromotive force) from a motor
may occur, connect a transorb or a varistor across the output to protect the power
supply.
27
Load Connection and Sensing
Load Connection
Load Wiring To select wiring for connecting the load to the power supply, consider the following
factors:
• insulation rating of the wire
• current carrying capacity of the wire
• maximum load wiring length for operation with sense lines
• noise and impedance effects of the load lines
Insulation Rating Use load wiring with a minimum insulation rating at least
equivalent to the maximum output voltage of the power supply. If the output is offset
from ground, the insulation must be rated at least for the sum of the supply’s
maximum output and the offset.
Current Carrying Capacity As a minimum, load wiring must have a current
capacity greater than the output current rating of the power supply . This ensures that
the wiring will not be damaged even if the load is shorted. See Table 3.1 for the
maximum current rating, based on 450 A/cm
2
, for various gauges of wire rated for
105 °C operation. Operating at the maximum current rating results in an
approximately 30 °C temperature rise for a wire operating in free air. Where load
wiring must operate in areas with elevated ambient temperatures or bundled with
other wiring, use larger gauges or wiring rated for higher temperatures.
Table 3.1 Current Carrying Capacity for Load Wiring
Wire Size
(AWG)
20 2.5 6 61
18 4 4 97
16 6 2 155
14 10 1 192
12 16 1/0 247
10 21 2/0 303
836
Maximum Current
(A)
Wire Size
(AWG)
Maximum Current
(A)
28 Operating Manual for XT Series Power Supply
Load Connection and Sensing
Load Connection
Load Wiring Length for Operation with Sense Lines For applications using
remote sensing, you must limit the voltage drop across each load line. See Figure 3.1
for some maximum allowable lengths for a given load current and wire size. We
recommend that you use the larger load wiring to ensure a smaller voltage drop
(0.1 V typical maximum), although units can compensate for up to 0.5 V drop in
1
each line
.)
Making Load
Connections
Figure 3.1 Maximum Wire Length for 100 mV Line Drop
Noise and Impedance Effects To minimize noise pickup or radiation, use
shielded pair wiring of the shortest possible length for load wires. Connect the shield
to the chassis via the front panel binding post or a rear panel mounting screw. Where
shielding is impossible or impractical, simply twisting the wires together will offer
some noise immunity.
Front Panel Binding Posts To make connections at the front panel, connect
load wires using stripped wire (0.6"), tongue lugs, or banana plugs to the output
binding posts.
For binding posts locations, see Figure 1.1 Front Panel Controls, p. 13.
1. Any losses in the load cables must be deducted from the maximum output voltage of
the supply. For example, a 15 V supply with a 1 V loss in the lo ad cables can supply a
maximum of 14 V regulated at the load.
29
Load Connection and Sensing
Grounding
Rear Panel Terminals T o make load connections, attach the wire using the steps
below:
1. Strip load wires 0.25 in.(6 mm)
2. Using a flat-bladed 1/8 in. (3 mm) screwdriver, loosen the positive (+) and
negative (−) output terminal screws on the output terminal block.
3. Insert the wire into the bottom of the block and tighten screw.
Connecting
Multiple
Loads
Grounding
Proper connection of distributed loads is an important aspect of power supply use. A
common mistake is to connect leads from the power supply to one load and then from
that load to other loads. In this parallel power distribution method, the voltage at each
load depends on the current drawn by the other loads, and DC ground loops develop.
Except for low current applications, we recommend that you do not use this method.
It is preferable to distribute power via the radial distribution method — in which
power is connected individually to each load. In the radial method, a single pair of
terminals are designated as the positive and negative distribution terminals. This pair
of terminals may be the power supply output terminals, the load terminals, or a
distinct set of terminals specially established for distribution. In this scheme, there
are no ground loops and the effect of one load upon another is minimized.
Make proper ground connections to avoid developing paths between separate ground
points. T o avoid ground loops, there must be only one ground return point in a power
system. If the load itself is not grounded, ground the positive or negative output (as
appropriate) to the supply's chassis using a rear panel screw or the front panel ground
binding post.
30 Operating Manual for XT Series Power Supply
Local Sensing
Load Connection and Sensing
Local Sensing
Sensing of the output voltage is available from both the rear panel and the front panel
output connectors. Default local sensing regulates the voltage at the power supply
output terminal. Use remote sensing (see “Remote Sensing” on page 32) when the
voltage needs to be regulated at the load rather than at the power supply output
terminals.
Without sense line connections, the supply regulates the voltage at the output
terminals of the power supply.
See Figure 1.1 Front Panel Controls, p. 13, and Figure 1.3 Rear Panel., p. 14, for
sense terminal locations on the front and rear panels.
31
Load Connection and Sensing
!
!
Remote Sensing
Remote Sensing
WARNING
There is a potential shock hazard at the sense points when using a power supply
with a rated output greater than 40 V. Ensure that connections at the load end are
shielded to prevent contact with hazardous voltages.
CAUTION
Operation of the supply in remote sense mode without the assured connection of
the load wires and remote sense wires to the load may damage the power
supply.
CAUTION
Ground the sense line shield in one place only. Locations include: the power’s
supply’s return output connection at the load, the power supply’s return output at
the negative output terminal, or the power supply’s ground binding post on the
front panel.
Remote sensing permits you to relocate the regulation point of the power supply
from the output terminals to the load or other distribution point terminals.
The power supply provides sense connections beside the output terminals at the front
and rear panels. Use 22-24 AWG twisted, shielded pair wiring to make sense
connections.
With remote sense leads in place, the supply regulates for the displayed voltage at
the point where the sense lines are connected to the output leads (provided the sum
of these lead losses does not exceed 0.5 V). With the sense lines disconnected, the
supply regulates the voltage at the output terminals.
Note
Do not operate the supply with sense lines connected to the load without also
connecting the normal load power leads to the output terminals.
Avoid reversing positive (+) and negative (-) lead connections.
Always use shielded pair wiring for sense lines to minimize noise effects (see
“Grounding” on page 30).
32 Operating Manual for XT Series Power Supply
Section 4. Operation
Introduction
Once you have installed the power supply and have connected both the AC input
power and the load as covered in Section 2 Installation, the power supply is ready to
operate.
• Operating Modes, below, offers a brief explanation of Constant Voltage and
Constant Current Mode operation.
• “Connecting Multiple Supplies in Series (Voltage Mode Only)” on page 35,
covers using multiple supplies.
Operating Modes
Your power supply has two basic operating modes: Constant Voltage Mode and
Constant Current Mode. The mode in which the power supply operates at any given
time depends on the combination of:
• output voltage setting V
• output current limit setting I
• resistance or impedance of the attached load R
SET
SET
L
Figure 4.1 represents the relationships between these variables.
Output
Voltage
VSET
O
O
Constant Voltage
Mode Region
I SET
Figure 4.1 Operating Modes
Constant Current
Mode Region
RL > V
Crossover Point
Output
Current
SET
I
SET
V
R
L
SET
=
I
SET
R
V
L
SET
<
I
SET
Where:
= Load Resistance
R
L
V
SET
I
SET
= Output Voltage Setting
= Output Current Setting
33
Operation
Operating Modes
Note The control circuits have been designed to allow you to set output voltage and
current up to 5% over the model-rated maximum values. The power supply will operate
within these extended ranges, but we cannot guarantee full performance to
specification.
Constant
Voltage Mode
Operation
Constant
Current Mode
Operation
The power supply will operate in constant voltage (CV) mode whenever the load
current I
In CV, the power supply maintains the output voltage at the selected value (V
while the load current I
is less than the current limit setting I
L
varies with the load requirements.
L
or: IL < I
SET
(Note: IL = V
SET
SET
/ RL).
)
SET
To use the power supply in CV mode, either set the current limit to maximum by
turning the current control to its extreme clockwise position, or take the precaution
of setting a desired maximum current, then set the voltage control to the desi red
voltage.
The power supply will operate in constant current (CI) mode whenever the load
resistance is low enough that at V
current limit setting I
SET
.
In CI mode, the power supply maintains the output current at the selected value (I
the load current would be greater than the
SET
V
SET
-------------
>
I
R
SET
L
SET
while the output voltage varies with the load requirements.
T o set the Current Limit, connect a shorting lead across the output terminals, turn the
voltage control a half-turn clockwise, and set the desired maximum value of current
limit by turning the current control slowly clockwise to the desired level. Then,
disconnect the shorting lead from the output terminals. The power supply will now
automatically switch into current limiting mode (current regulation) as soon as the
preset current level is reached. To operate the supply in CI mode, set the current limit
as described above, then set the voltage control fully clockwise or to the compliance
voltage of the circuit. As soon as the supply starts operating in current mode, the red
current mode LED will turn on.
)
34 Operating Manual for XT Series Power Supply
Operation
!
Using Multiple Supplies
Automatic
Mode
Crossover
The automatic crossover system allows the power supply to automatically switch
operating modes in response to changing load requirements. For example, if the load
current attempts to increase above the setting of the current adjust control, the unit
will switch automatically from CV to CI mode. If you lower the load requirements,
the supply will automatically return to CV mode.
Constant
Power Loads
When powering constant power loads su ch as switch mode regulators, it is preferable
to run in constant voltage mode, with the current limit set to supply ample current.
Operating near the CV/CI transition point can cause operation to become unstable.
Using Multiple Supplies
Connecting
Multiple
Supplies in
Series
(Voltage
Mode Only)
You can operate two or more power supplies with outputs connected in series or in
parallel to obtain increased load voltage or current. A split supply configuration
allows you to obtain two positive outputs or a positive and a negative output.
CAUTION
The maximum allowable voltage in series operation is 400 Vdc.
Connect power supplies in series to obtain a single output supply with higher output
voltage. Connect the negative (–) terminal of one supply to the positive (+) terminal
of the next supply. The total voltage available is the sum of the maximum voltages
of each supply (add voltmeter readings). The maximum current available to the load
is equal to the current of the lowest rated supply in the series. See Figure 4.2 for a
representation of series operation.
Figure 4.2 Series Operation with and without OVP
35
Operation
!
!
Using Multiple Supplies
Note
You do not need to use remote sensing for series operation. If you choose to use it,
refer to
Diodes CR1 and CR2 protect sense circuits during transient events such as
momentary current limit events which may cause supply outputs to collapse.
Connecting
Multiple
Supplies in
Parallel
Connect power supplies in parallel to obtain a single output supply with a higher
output current limit. Set all of the outputs to the same voltage before connecting the
positive (+) and negative (−) terminals in parallel. The total current available is the
sum of the maximum currents of each supply.
“Remote Sensing” on page 32.
CAUTION
For parallel operation with OVP-equipped supplies, set all OVP trip points higher
than the maximum output voltage. To prevent the internal OVP fuse from blowing
during OVP trip events, add external blocking diodes as illustrated in Figure 4.3.
CAUTION
The configuration shown in Figure 4.3 is for use with local sense only. Do not
attempt to use remote sensing with the diodes as shown. Damage to the sense
circuits may occur.
The maximum voltage available at the load is equal to the voltage of the lowest rated
supply. When you connect two supplies in parallel, the supply with the higher
voltage setting will be in the current limiting mode, while the other supply controls
the output voltage
Figure 4.3 Parallel Operation with OVP-equipped Units
(Local Sensing Only)
36 Operating Manual for XT Series Power Supply
Operation
Using Multiple Supplies
Split Supply
Operation
Split supply operation uses two power supplies to obtain two positive voltages with
a common ground, or to obtain a positive-negative supply.
Two Positive Voltages To obtain two positive voltages, connect the negative
output terminals of both supplies together in a common connection. The positive
output terminals will provide the required voltages with respect to the common
connection.
Figure 4.4 Split Supply Operation of Multiple Supplies (Two positive voltages)
Positive-negative supply To obtain a positive-negative supply, connect the
negative output terminal of one supply to the positive terminal of the second supply.
The positive output terminal of the first supply now provides a positive voltage
relative to the common connection. The negative output terminal of the second
supply provides the negative voltage. The current limits can be set independently of
each other. The maximum current available in split operation is equal to the rated
output of the supplies.
37
Operation
Using Multiple Supplies
Figure 4.5 Split Supply Operation of Multiple Supplies (Positive-negative supply)
Note The optional Analog Programming (APG) Interface has a Master/Slave Tracking
feature which will allow one-knob control of both supplies in a split supply configuration.
38 Operating Manual for XT Series Power Supply
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