By California Instruments.
Model 251TL / 351TL
AC Power Source
User and Programming Manual
Revision C
November 2001
Copyright 2001
All rights reserved.
P/N 7351-960
TEL: +1 (858) 677-9040
FAX: +1 (858) 677-0940
Email: sales@calinst.com
Web Site: http://www.calinst.com
User and Programming Manual - Rev C
User and Programming Manual
AC Power Source
California Instruments
Models:
• 251TL, 351TL
• Options: -L22, -OP1, -SKT, -RMS, -EXT
Copyright 2001 California Instruments, Rev C, November 2001
TL Series November 2001 i
User and Programming Manual - Rev C
SAFETY SUMMARY
This power source contains high voltage and current circuits that are potentially lethal.
Because of its size and weight, electrical and mechanical stability must be ensured. The
following safety guidelines must be followed when operating or servicing this equipment.
These guidelines are not a substitute for vigilance and common sense. If this power
source is not used as specified in this manual, the protection provided by this equipment
may be impaired. California Instruments assumes no liability for the customer's failure to
comply with these requirements.
APPLYING POWER AND GROUNDING
Verify the correct voltage is applied to the unit (100 / 115 / 200 or 230 VAC Nominal). Verify that the
input power wiring is connected to a properly grounded utility outlet.
FUSES
Use only fuses of the specified current, voltage, and protection speed.
Do not short out the fuse holder or use a repaired fuse.
The main supplies in the 351TL use a North American ferrule fuse rated at
30A. (Fast Acting)
DO NOT OPERATE IN A VOLATILE ATMOSPHERE
Do not operate the power source in the presence of flammable gases or fumes. This product is
designed to operate in a controlled environment. Do not expose to rain or snow.
DO NOT TOUCH ENERGIZED CIRCUITS
Disconnect the power cable before servicing this equipment. Only qualified service personnel
may remove covers, replace components or make adjustments.
DO NOT SERVICE ALONE
Do not remove covers, replace components, or make adjustments unless another person, who
can administer first aid, is present.
DO NOT EXCEED INPUT RATINGS
Do not exceed the rated input voltage or frequency. Additional hazards may be introduced
because of component failure or improper operation.
DO NOT MODIFY INSTRUMENT OR SUBSTITUTE PARTS
Do not modify this instrument or substitute parts. Additional hazards may be introduced because
of component failure or improper operation.
MOVING THE POWER SOURCE
When moving the power source, observe the following:
1. Remove all AC power to unit.
2. Use two people to prevent injury.
SURFACE STABILITY
Operate the power source only on a level surface.
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Electrical Safety Symbols Used in This Manual
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WARRANTY INFORMATION
CALIFORNIA INSTRUMENTS CORPORATION warrants each instrument manufactured by
them to be free from defects in material and workmanship for a period of one year from the
date of shipment to the original purchaser. Excepted from this warranty are fuses and
batteries that carry the warranty of their original manufacturer where applicable.
CALIFORNIA INSTRUMENTS will service, replace, or adjust any defective part or parts, free
of charge, when the instrument is returned freight prepaid, and when examination reveals
that the fault has not occurred because of misuse, abnormal conditions of operation, user
modification, or attempted user repair. Equipment repaired beyond the effective date of
warranty or when abnormal usage has occurred will be charged at applicable rates.
CALIFORNIA INSTRUMENTS will submit an estimate for such charges before commencing
repair, if so requested.
If a fault develops, notify CALIFORNIA INSTRUMENTS at support@calinst.com or its local
representative, giving full details of the difficulty, including the model number and serial
number. On receipt of this information, service information or a Return Material Authorization
(RMA) number will be given. Add the RMA number furnished to the shipping label. Pack the
instrument carefully to prevent transportation damage, affix label to shipping container, and
ship freight prepaid to the factory. CALIFORNIA INSTRUMENTS shall not be responsible for
repair of damage due to improper handling or packing. Instruments returned without RMA
No. or freight collect may be refused at California Instruments discretion. Instruments
repaired under Warranty will be returned either via prepaid surface freight or low cost
airfreight at California Instruments discretion. Instruments repaired outside the Warranty
period will be returned freight collect, Ex Works CALIFORNIA INSTRUMENTS 9689 Towne
Centre Drive, San Diego, CA 92121-1964. If requested, an estimate of repair charges will
be made before work begins on repairs not covered by the Warranty.
SERVICE PROCEDURE
DAMAGE IN TRANSIT
The instrument should be tested when it is received. If it fails to operate properly, or is
damaged in any way, a claim should be filed immediately with the carrier. The claim agent
should obtain a full report of the damage, and a copy of this report should be forwarded to us
by fax or email (Fax: 858 677 0940, Email: support@calinst.com). CALIFORNIA
INSTRUMENTS will prepare an estimate of repair cost and repair the instrument when
authorized by the claim agent. Please include model number and serial number when
referring to the instrument.
SPARE PARTS
To order spare parts, user manuals, or determine the correct replacement part for your
California Instruments products, please contact the Customer Service department by phone
at + 1 858 677 9040, press 2 or by email support@calinst.com.
iv November 2001 TL Series
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Table of Contents
1 Introduction.....................................................................................................................................1
1.1 General Description...............................................................................................................................1
1.2 Accessory Equipment/Rack Slides........................................................................................................1
2 Specifications..................................................................................................................................3
2.1 Electrical................................................................................................................................................3
2.2 Measurements [Option].........................................................................................................................6
2.3 System Specification.............................................................................................................................7
2.4 Unit Protection.......................................................................................................................................8
2.5 Mechanical.............................................................................................................................................8
2.6 Environmental........................................................................................................................................9
2.7 Regulatory.............................................................................................................................................9
2.8 Front Panel Controls............................................................................................................................10
2.9 Available Options.................................................................................................................................10
3 Installation and Functional Test....................................................................................................11
3.1 Unpacking............................................................................................................................................11
3.2 Power Requirements...........................................................................................................................11
3.3 Input Voltage Range Selection............................................................................................................13
3.4 Mechanical Installation........................................................................................................................17
3.5 Input Wiring.........................................................................................................................................17
3.6 Output Connections.............................................................................................................................17
3.7 Output Voltage Ranges.......................................................................................................................18
3.8 Functional Test....................................................................................................................................19
3.9 Current Limit - Modes of Operation.....................................................................................................21
4 Front Panel Operation ..................................................................................................................23
4.1 Functional Controls..............................................................................................................................23
4.2 How to Examples.................................................................................................................................28
4.3 Setting the Power on Initialization Values............................................................................................31
4.4 Current Limit Modes............................................................................................................................32
4.5 Function Strobe [Option]......................................................................................................................33
4.6 Remote Inhibit [Option]........................................................................................................................33
5 Principle of Operation ...................................................................................................................35
5.1 General................................................................................................................................................35
5.2 Overall Description..............................................................................................................................35
5.3 Input Power Supply..............................................................................................................................35
5.4 Range Relay Board.............................................................................................................................39
5.5 Amplifier...............................................................................................................................................39
5.6 Controller Module................................................................................................................................39
5.7 IEEE 488/ RS232 Interface [Option]....................................................................................................40
6 Calibration.....................................................................................................................................43
6.1 Calibration Equipment.........................................................................................................................43
6.2 Selecting Calibration Mode..................................................................................................................44
6.3 Routine Calibration..............................................................................................................................45
6.4 Non-Routine Calibration......................................................................................................................49
7 Service..........................................................................................................................................53
7.1 General................................................................................................................................................53
7.2 Basic Operation...................................................................................................................................53
7.3 Module Removal..................................................................................................................................55
7.4 Replaceable Parts...............................................................................................................................58
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8 Remote Control ............................................................................................................................59
8.1 Introduction.........................................................................................................................................59
8.2 PGUI32 Program Requirements.........................................................................................................59
8.3 IEEE Interface.....................................................................................................................................61
8.4 RS232C Interface................................................................................................................................62
8.5 PGUI32 Setup and Installation............................................................................................................ 64
8.6 Trouble Shooting - RS232C................................................................................................................66
8.7 Trouble Shooting - IEEE-488 / GPIB...................................................................................................69
8.8 PGUI32 Distribution Files.................................................................................................................... 70
8.9 Software Registration.......................................................................................................................... 71
9 Introduction to SCPI .....................................................................................................................73
9.1 Conventions Used in This Manual.......................................................................................................73
9.2 The SCPI Commands and Messages.................................................................................................73
9.3 Using Queries .....................................................................................................................................76
9.4 Structure of a SCPI Message..............................................................................................................76
9.5 SCPI Data Formats.............................................................................................................................79
10 SCPI Command Reference......................................................................................................81
10.1 Subsystem Commands....................................................................................................................... 81
10.2 Calibration Subsystem ........................................................................................................................82
10.3 Measurement Subsystem....................................................................................................................87
10.4 Source Subsystem.............................................................................................................................. 90
10.5 Output Subsystem............................................................................................................................... 94
10.6 Limit Subsystem..................................................................................................................................97
10.7 Display Subsystem.............................................................................................................................. 99
10.8 System Commands...........................................................................................................................100
10.9 Common Commands ........................................................................................................................102
11 Programming Examples .........................................................................................................110
11.1 Introduction ....................................................................................................................................... 110
11.2 Programming the Output...................................................................................................................110
11.3 Making Measurements......................................................................................................................112
12 Status Registers......................................................................................................................114
12.1 Power-On Conditions........................................................................................................................114
12.2 Standard Event Status Group ........................................................................................................... 115
12.3 Status Byte Register..........................................................................................................................115
12.4 Examples...........................................................................................................................................116
Appendix A : SCPI Command tree....................................................................................................117
Appendix B : SCPI Conformance Information...................................................................................118
Appendix C : Error Messages............................................................................................................119
Index..................................................................................................................................................120
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List of Figures
Figure 2-1: Output Power Rating as a Function of Voltage and Load PF.............................................5
Figure 3-1: Model 251TL / 351TL AC Power Source..........................................................................11
Figure 3-2: Rear Panel View...............................................................................................................12
Figure 3-3: Connections to T1 for 105 - 125V Line Input....................................................................14
Figure 3-4: Connections to T1 for 210 - 250V Line Input....................................................................16
Figure 3-5: Test Setup 351TL.............................................................................................................20
Figure 4-1: Front Panel View ..............................................................................................................23
Figure 4-2: Voltage Auto Range Switch Over Points..........................................................................25
Figure 4-3: Shuttle Knob.....................................................................................................................26
Figure 5-1: AC Power System Block Diagram....................................................................................37
Figure 6-1: Test Equipment Hookup for Routine Output and Voltage Measurement Calibration.......45
Figure 6-2: Test Equipment Hook-up for Current and Power Measurement Calibration....................46
Figure 6-3: Internal Adjustments.........................................................................................................51
Figure 7-1: Assembly Location ...........................................................................................................56
Figure 8-1: Rear Panel View...............................................................................................................60
Figure 8-2: GPIB Address Selection Switch .......................................................................................61
Figure 8-3: RS232C Interface Cable Wiring Diagram.........................................................................64
Figure 8-4: System Properties Dialog Box..........................................................................................67
Figure 8-5: Advanced Port Settings Dialog Box..................................................................................67
Figure 8-6: COM Port Properties Dialog Box......................................................................................67
Figure 8-7: NI AT-GPIB/TNT Settings ................................................................................................69
Figure 8-8: NI AT-GPIB/TNT Advanced Settings Dialog ....................................................................69
Figure 9-1: Partial Command Tree.....................................................................................................74
Figure 9-2: Command Message Structure..........................................................................................76
Figure 12-1: AC Source Status System Model.................................................................................114
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List of Tables
Table 4-1: Factory Default Power on Settings....................................................................................31
Table 6-1: Load Resistors and Current...............................................................................................43
Table 6-2: CAL Mode Status LED Indicators......................................................................................44
Table 7-1: Basic Symptoms................................................................................................................53
Table 7-2: Poor Output Voltage Accuracy..........................................................................................53
Table 7-3: Poor Output Voltage Regulation........................................................................................53
Table 7-4: Distorted Output ................................................................................................................54
Table 7-5: Unit Shuts Down After 3-5 Seconds..................................................................................54
Table 7-6: No Output and No Lights on Front Panel ..........................................................................54
Table 7-7: No Output But "Display" Is On..........................................................................................54
Table 7-8: Replaceable Parts .............................................................................................................58
Table 10-1: Mode Command Encoding..............................................................................................99
Table 10-2: Bit Configuration of Standard Event Status Enable Register ........................................103
Table 10-3: Bit Configuration of Standard Event Status Register.....................................................104
Table 10-4: *RST Default Parameter Values....................................................................................106
Table 10-5: Status Registers - Power on Conditions........................................................................106
Table 10-6: Bit Configuration of Status Byte Register ......................................................................108
Table 12-1: Bus Error Messages......................................................................................................119
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RMS
RMS
1 Introduction
This instruction manual contains information on the installation, operation, calibration and
maintenance of the 351TL and 251TL AC power source.
1.1 General Description
The 351TL AC source is a 350 VA programmable AC power source. The 251TL is a 250 VA
version of the power source. In addition to the standard models, several options are
available that may change the voltage and frequency ranges of the power source. This user
manual covers the following models:
Model Voltage ranges Max. Current
351TL 135 V
270 V
251TL 135 V
270 V
The output voltage High and Low terminals are isolated from the chassis, and earth ground.
The AC input can be either 105 V
91 V
RMS
to 109 V
RMS
or 182 V
RMS
to 125 V
RMS
to 217 V
RMS
Simple front panel controls enable the voltage, current limit and frequency to be changed.
An optional RS232C and IEEE 488 interface is available for applications that require remote
control and measurements.
1.2 Accessory Equipment/Rack Slides
General Devices Company Model C300-120-B308 rack slides (option -RMS) may be
attached to the sides of the power source using 10-32 X 3/8 flat head screws.
2.8 A
RMS
RMS
RMS
AC, 210 V
RMS
1.4 A
2.4 A
1.2 A
RMS
RMS
RMS
RMS
to 250 V
at 47 to 67 Hz line frequency.
RMS
AC,
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2 Specifications
All specifications at 23 ±5°C unless noted otherwise.
2.1 Electrical
Input
Line Voltage:
115 V
230 V
100 V
200 V
nominal, 105 V
RMS
nominal, 210 V
RMS
nominal, 91 V
RMS
nominal, 182 V
RMS
RMS
RMS
RMS
RMS
to 125 V
to 250 V
to 109 V
to 217 V
RMS
RMS
RMS
RMS
AC
AC
Unit must be configured for correct Line input voltage.
Line Current: 9 A
maximum, line voltage = 115 VAC, full-load
RMS
PF = 0.7
Inrush Current:
150 A
75 A
for 115V line
pk
for 230V line
pk
Input power factor: 0.7 at full-load and 115 VAC input
Line Frequency: 47 Hz - 67 Hz
Isolation Voltage: Input to output = 2300 VAC, input to chassis = 1350 VAC
Output
Parameter Specification
Voltage
Range 0 to 135 V
or 270 V
RMS
(standard ranges)
RMS
Resolution 0.1 volt
Accuracy
± 0.1 % of calibrated range, 45 Hz - 100 Hz
± 0.2 % of calibrated range, 100 Hz - 5000 Hz
± 0.3 % of calibrated range, 5000 Hz - 8000 Hz
Load Regulation 0.1 % of FS. Add 0.05% above 2000 Hz
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Parameter Specification
External Sense Will compensate for up to 5% of voltage drop up to 2kHz
Line Regulation 0.02 % of FS
Settling time From start of voltage change from 5.0 V
voltage to within 2% of final value:
Distortion (THD
into linear load)
<0.5 % maximum 45 to 499 Hz
<1.0 % above 500 Hz
<2.0% 1000 to 8000Hz
DC Offset voltage AC Coupled transformer output
Output noise -73 db typical
( 20 kHz to 1 MHz at full load )
Temperature
± 0.02 % of full scale per degree C
coefficient:
Stability (24 hours) ± 0.015 % of full scale under constant load, line and
temperature
Total Power
PT = 0.7
351TL: 350 VA from 90 to 100% of V range
251TL: 250 VA from 78 to 100% of V range
Current (Refer to Figure 2-1 for derating)
Output
V Range
351TL
251TL
RMS
No load: 16 msec
Full load: 300 msec
(16 msec to within 15 % of final value)
Amps rms Amps peak
135
270
135
270
2.8
1.4
2.4
1.2
or higher
6
3
6
3
Adjustable Limit 0.0 to Maximum available RMS current for selected
voltage range.
Accuracy Programmed value + 5, -0 % of maximum RMS current
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Parameter Specification
Frequency
Range 351TL 16.0 - 8000 Hz
Resolution 0.01 Hz from 16.00 to 80.00 Hz
Accuracy
Maximum output voltage available from 45 Hz.
0.1 Hz from 80.1 Hz to 800.0 Hz
1 Hz from 801 Hz to 8000 Hz
± 0.02% of programmed value
Temperature
± 5 ppm per degree Celsius
coefficient
Stability ± 15 ppm per year
Figure 2-1: Output Power Rating as a Function of Voltage and Load PF
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2.2 Measurements [Option]
Parameter Specification Unit
True RMS Current
Available on standard unit.
Range 0.000 - 4.000 A
Accuracy 0.2 % FS + 0.3 % reading
Resolution 0.001 A
Temp
Coefficients
Peak Current Requires Option -OP1
Range 0.00 – 12.00 A
Accuracy 0.5 % FS + 0.5 % reading
Resolution 0.01 A
Crest Factor
Available over bus only. Requires interface Option -OP1
Range 0.00 - 4.00
Accuracy 0.05
Resolution 0.01
True RMS Voltage Standard Unit: Available over bus only.
-OP1 option: Front Panel and bus.
Range 0.0 - 300.0 V
Accuracy 0.1 % FS + 0.05 % reading
Resolution 0.1 V
Temp
Coefficients
Real Power Requires Option -OP1
Range 0 - 400.0 W
Accuracy 0.2 % FS + 0.5 % reading
Resolution 0.2 W
Temp
Coefficients
Apparent Power
Available over bus only. Requires -OP1 option
Range (Remote only) 0 - 400.0 VA
Accuracy 0.3 % FS + 0.8 % reading
Resolution 2 VA
Power Factor
Requires -OP1 option
Range 0.00 - 1.00
Resolution 0..01
0.016
0.05
0.06
RMS
RMS
% FS / °C
PEAK
PEAK
RMS
RMS
V / °C
% FS /°C
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2.3 System Specification
Parameter Specification
Setup storage Eight non volatile front panel setup registers available through
interface. Power on setting register available from front panel.
Interface (Option package -OP1 required)
RS-232C Bi-directional serial interface
Rear panel connector: 9 pin D shell
Handshake: CTS, RTS
Data bits: 8
Stop bits: 1
Parity: None
Baud rate: 19200
Command syntax: IEEE 488.2 commands and SCPI
IEEE-488 GPIB Interface
Rear panel connector: 24 pin D-shell
IEEE address: set using dip switch on rear panel from
0 to 31
IEEE functions: SH1, AH1, T8, L4, RL2, SRQ 0, PP 0,
DC 0, DT 0, C0
Terminators: LF, CRLF, EOI
Command syntax: IEEE 488.2 commands and SCPI
Remote Inhibit (Option package -OP1 required)
Rear panel connector: BNC
Input Contact closure to ground or logic low TTL
signal required to turn off output.
Automatic recovery when RI signal is
removed.
Function Strobe (Option package -OP1 required)
Rear panel connector: BNC
Output Active low TTL signal. Signal driven low for
approximately 400 µsec any time output
voltage or frequency programmed value
changes. Signal level may be changed by
removing jumpers to open collector.
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2.4 Unit Protection
Parameter Specification
Input Overcurrent: Electronic current limit with circuit breaker.
Transients: Surge protection to withstand EN50082-1 (IEC 801-4, 5) levels.
Output Overcurrent: Constant current operation. (Standard)
0.1 Second shutdown (constant voltage mode Option)
Output Short Circuit: Peak current limit.
Shutdown (constant voltage mode Option).
Overtemperature: Automatic shutdown.
2.5 Mechanical
Parameter Specification
Dimensions: Height Width Depth Unit
13.26 48.26 56.62 cm
5.22 19 22.29 inches
Unit Weight: 34 Kg / 75 lbs
Material: Steel chassis and panels.
Aluminum cover.
Finish: Yellow iridite, painted semi-gloss polyurethane
Cooling: Fan cooled with air intake on the sides and exhaust to the rear.
Internal Construction: Modular sub assemblies.
Chassis Slides: P/N 210960 / Option -RMS
General Devices Model CTS-1-20-B307-2
Front Panel Mounted Output Connection:
Wonpro Universal outlet socket (option -SKT)
Rear Panel Mounted Connectors:
RS232C I/F DB 9
IEEE-488 I/F D-shell 24 pin
Remote Inhibit BNC (requires -OP1 option package)
Function Strobe BNC (requires -OP1 option package)
AC Output Amp 1-480705-1
External Sense Amp 1-480705-1
Line Input Kulka 9-85-3 Terminal block
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2.6 Environmental
Parameter Specification
Operating Temp: 0 degrees to + 40 degrees Celsius.
Storage Temp: - 40 degrees to + 85 degrees Celsius.
Humidity:
Altitude Operating: 15000 feet / 6000 meters maximum.
Creepage and
Clearance:
Insulation: Rated to Installation Category (Overvoltage Category) II
Vibration: Designed to meet NSTA 1A transportation levels.
Shock: Designed to meet NSTA 1A transportation levels.
2.7 Regulatory
Parameter Specification
Electromagnetic
Emissions and
Immunity:
Acoustic Noise: 65 dBA maximum at 0% to 50% load, 75 dBA maximum greater
Operating: ≤ 90% RH up to 40° C., non condensing
Storage: ≤ 90% RH up to 40° C, ≤75% RH up to 70° C.
VA Power: Full VA power output :0 - 6000 feet / 0 - 2000
meters.
Derate VA power 5 % per 1000 feet from 6000 to
15000 feet / 2000 to 6000 meters.
Rated for Pollution Degree 2.
Designed to EN50081-1 and EN50082-1 European Emissions
and Immunity standards as required for the “CE” marking.
than 50% load to 100% load. Measured at one meter.
Safety: Designed to EN61010-1 European safety standards as required
for the “CE” marking.
Remote Control
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2.8 Front Panel Controls
Parameter Specification
Controls: Shuttle knobs:
Allows continuous change of Voltage, Frequency and Current
limit. Voltage change is inactive on single voltage range
configuration units.
Function keys:
Controls Output state, Voltage range and Display mode.
Displays: Two, 4 digits, 0.5” LCD display. For viewing programmed voltage,
frequency, current limit and for displaying measured current.
Status Indicators: 10 LEDs to indicate:
REMOTE, FAULT, OUTPUT (ON/OFF), VOLTAGE RANGE
HIGH, VOLTAGE RANGE AUTO
FREQUENCY, CURRENT, PEAK CURRENT, POWER, POWER
FACTOR DISPLAY MODES (Refer to paragraph 4.1.2).
2.9 Available Options
Option Description
-OP1 Option package 1 includes:
-RMS Rack mount slides
-SKT Universal front panel dual outlet socket.
-EXT Removes controller and allows external oscillator input.
1
• Measurement Functions
• Combined IEEE-488 / RS232C interface.
• Remote Inhibit Input
• Function Strobe Output
P/N 211045 / Option -RMS
General Devices Model C300S-120-B308
1
Additional options may have been made available since this manual revision. Installed options are listed on
the power source’s type sticker. A manual addendum may be issued for new options not covered by this
manual.
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3 Installation and Functional Test
3.1 Unpacking
Inspect the unit for any possible shipping damage immediately upon receipt. If damage is
evident, notify the carrier. DO NOT return an instrument to the factory without prior
approval. Do not destroy the packing container until the unit has been inspected for damage
in shipment.
3.2 Power Requirements
The AC Power System has been designed to operate from a single phase AC line voltage.
The nominal operating voltage is 100V, 115V, 200V or 230V line input. The Power Source
line input setting is shown on the type sticker located on the rear panel.
Figure 3-1: Model 251TL / 351TL AC Power Source
WARNING: Do not connect the unit to a 400-480 service, as the result will be a severely
damaged unit.
Do not connect the unit to AC line input unless the nominal line input settings
match those of the available AC line voltage.
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3.2.1 AC Line Voltage
The AC Power Source has been designed to operate from either of the following AC line
voltage ranges:
1) 91 to 109 V
2) 82 to 217 V
3) 105 to 125 V
4) 210 to 250 V
RMS
RMS
RMS
RMS
CAUTION: The AC Power Source will be damaged if it is operated at an input voltage
that is outside its configured input range.
The input voltage range is set at the factory. Section 3.3 gives the procedure to change the
input voltage range. The location for connection of the INPUT line is shown in Figure 3-2.
3.2.2 Line Frequency Operating Range
The AC Power Source has been designed to operate with a line frequency from 47Hz to
67 Hz.
3.2.3 Input Power
The input power to the AC Power Source depends upon line and load conditions and may be
as high as 1000 watts.
Figure 3-2: Rear Panel View
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4
5
3.3 Input Voltage Range Selection
WARNING: The line voltage is present in certain sections of this Power Source.
DEATH: On contact may result if personnel fail to observe safety precautions.
Do not touch electric circuits when power is applied. Servicing should
only be performed by trained personnel.
The input voltage range is configured by changing the taps on the input transformer. See
Figure 3-3 or Figure 3-4 for the location of the jumpers and input wires.
3.3.1 Voltage Range Configuration (105 – 125 V)
In order to change the voltage range configuration:
1. Turn off the input circuit breaker.
2. Disconnect AC input power to the source by unplugging the power cord.
3. Remove the AC Power Source top cover by removing (14) #6-32 x 5/16” FLH
screws. There are 7 screws on the sides and 7 screws on the top that hold the
cover.
Remove the (2) #6-32 x 1” PHN screws and lock washers that hold the amplifier near
the outside panel.
Remove the (2) #6-32 x 3/8” PHN screws and lock washers located near the
connector, attaching the red insulator to the center bracket.
The line input voltage range is set by the configuration of the Input Transformer, T1. To
configure T1 for the 105-125 volt range, make the following connections to T1 (refer to
Figure 3-3) :
Jumper terminals 1 and 4.
Jumper terminals 3 and 6.
Connect the input line from the Circuit Breaker to Terminals 1 and 6.
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Figure 3-3: Connections to T1 for 105 - 125V Line Input
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3.3.2 High Input Voltage Range Configuration (210 – 250 V)
In order to change the voltage range configuration:
1. Turn off the input circuit breaker.
2. Disconnect AC input power at TB1.
3. Remove the AC Power Source top cover by removing (14) #6-32 x 5/16” FLH
screws. There are a total of 7 screws on the sides and another 7 screws on the top
that secure the top cover.
The line input voltage range is set by the configuration of the Input Transformer, T1. To
configure T1 for the 210-250 volt range, make the following connections to T1 (refer to
Figure 3-4) :
Jumper terminals 3 and 4.
Connect the input line from the Circuit Breaker to Terminals 1 and 6.
Remove all other connections to Terminals 1 through 6.
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Figure 3-4: Connections to T1 for 210 - 250V Line Input
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3.4 Mechanical Installation
The power source has been designed for rack mounting in a standard 19 inch rack. The unit
must be supported from the sides with optional rack slides. See Accessory Equipment/Rack
Slides in Section 1.2. The cooling fan at the rear of the unit must be free of any obstructions
which would interfere with the flow of air. A 2.5 inch (6.35cm) clearance should be
maintained between the rear of the unit and the rear panel of the mounting cabinet. Keep in
mind that adequate ventilation of the mounting cabinet must be maintained for sufficient
cooling of the power source. Use louvered side panels, and/or perforated rear panels to
assure adequate airflow. Also, the air intake holes on the sides of the power source must not
be obstructed when mounted inside cabinet. See Figure 3-1.
3.5 Input Wiring
The AC Power Source must be operated from a three-wire single-phase service. The mains
source must have a current rating greater than or equal to 10 A for the low input range. Use
the supplied safety cover/strain relief when connecting the input wires to the power source.
Refer to Figure 3-2 for the input power connections. When connecting the input wires to
input terminal block, make sure the safety grounding wire from the strain relief grommet is
longer than the Line and Neutral wire so that the ground wire will be the last one to take any
strain. For low-range input operation (115V) we recommend #12 AWG input wires as a
minimum. For high-range input operation (230V) #14AWG is recommended. For European
applications (230V), the following input cordset may also be used:
Panel Components # 86518030 Rated 16A, 250V, 70° C, 3x 1.5mm² conductor size. VDE
approved. Install as described above for discreet wiring.
3.6 Output Connections
The output terminal block is located at the rear of the power source or on the front panel with
Option -SKT. All load connections must be made on the rear panel terminal block or from
the front panel socket if the -SKT Option is installed. The remote sense inputs are normally
jumpered directly to the adjacent power output pins on the output connector. If the sense
terminals are not connected to the power output pins, the output voltage may rise significantly
above the programmed value. When connecting the output wires, use the supplied safety
cover/strain relief and mount over the output connector. Also mount the supplied snap-on
ferrite filter around the output wiring between the output terminals and the strain relief
grommet. Enclose ferrite filter with the safety cover.
If the load is a significant distance from the output terminal strip it may be desirable to sense
the output voltage directly at the load. If remote sensing is to be used, then the size of the
output power wiring must be heavy enough to prevent a voltage difference greater than 7% of
the programmed value from the power output pins to the sense input pins.
The Remote Sense inputs must be connected or an output voltage 7% higher than the
programmed output will be generated. If the Power Source is configured for constant
voltage, a fault will be generated.
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User and Programming Manual - Rev C
3.7 Output Voltage Ranges
The standard 351TL AC power source has two output voltage ranges 0-135 VAC and
0-270 VAC. The operator may switch from one range to the other at will with no special
precautions except to remember that the output voltage will go to zero voltage whenever a
range change takes place.
Certain options available on the 351TL series may result in different voltage range values or
a single voltage range only. Certain models may be ordered with a single voltage range only.
On single voltage range units, the Range change button has no function and the LED
indicator is not used.
351TL AC power source models with dual voltage ranges offer an auto voltage range change
mode. In this mode, the voltage range is automatically changed when the user sets a
voltage above 135 or below 131 V
The AUTO mode can be selected by pressing the range change button until the AUTO mode
LED illuminates. To take the AC power source out of the AUTO voltage range mode, press
the Voltage range button briefly. This will put the unit in the present range but takes it out of
auto mode.
RMS
.
Note: Even in AUTO mode, the output temporarily goes to zero volts when a
voltage range change occurs. If this is not acceptable, the AC source
should be operated in the high voltage range only and not in AUTO
mode.
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User and Programming Manual - Rev C
3.8 Functional Test
CAUTION: Work carefully when performing these tests - hazardous voltages are
present on the input and output during this test.
Refer to Figure 3-5 for the test set up. Use the following load resistor values:
Model Voltage Range Resistor Current (A
351TL 135
270
251TL 135
270
52 Ω
208 Ω
72.9 Ω
292 Ω
2.60
1.30
1.85
.92
RMS
)
1. Connect an oscilloscope, voltmeter and/or distortion analyzer to the AC source output at
the rear panel output terminal.
2. Connect the AC power input voltage connections to the AC source input terminals.
Connect the sense input to the adjacent power pin on the rear panel connector. Turn on
the power switch located at the rear panel.
3. Verify that the front panel LCD display reads out the initial start up voltage and frequency.
4. Select the low voltage range. Set the frequency to 60 Hz with the right shuttle. Select the
current function with the Frequency/Current selector. Set the current limit to the
maximum value using the right shuttle. Set the output voltage to 135V with the left
shuttle.
5. Enable the output by pressing the output “on/off” button in the top right of the front panel.
The green LED above the button will illuminate when the output is on. The output should
be a clean 135V AC sinewave having less than 0.5 % distortion.
6. Apply full load (refer to table on Figure 3-5) to the output of the source and verify the
output remains within 0.05 % of the initial 135V . The output should still be clean and the
distortion should still be less than 0.5 % at 60 Hz.
7. Using the right shuttle set the output current limit value to 2 amps (1 amp for the 251TL).
If the unit is configured for Constant Current mode, the system should go into current
limit and reduce the output voltage. This may create additional distortion on the output
voltage. If the unit is configured for Constant Voltage mode (factory default), an error
message will appear on the display (err. -300) that indicates an output fault condition and
the output will go off. Return the current value to the maximum current and disconnect
the load.
8. Repeat steps 4 through 7 but set the output for the following: Hi voltage range and the
current limit to maximum value. Refer to the table above for the relevant resistor values.
For units that are factory configured with a single voltage range, these steps do not have
to be repeated.
In the event the power source does not pass the functional test, refer to the calibration
procedure in Section 6 or call California Instrument’s customer satisfaction department for
further assistance.
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User and Programming Manual - Rev C
Figure 3-5: Test Setup 351TL
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3.9 Current Limit - Modes of Operation
When the Power Source is shipped from the factory, it is configured for the Constant Current
Mode of operation. This mode means if the load current exceeds the programmed Current
Limit value, the output current will continue at the programmed value.
The Power Source can be configured to operate in the Constant Voltage mode. In this mode
of operation, if the load current exceeds the Current Limit value, the output voltage will
default with the output relay open. The Constant Voltage mode is only usable if the default
voltage is set for 5.0 volts. If the default is any other voltage, the power source may display a
fault at power up.
To configure the Power Source, remove the input line voltage connection from the rear
panel. Remove the top cover. Install jumpers W1 and W2 on the front panel controller.
Reinstall the top cover.
TL Series November 2001 21
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