THURLBY THANDAR INSTRUMENTS
HIGH CURRENT DC POWER SUPPLIES
TSX SERIES
INSTRUCTION MANUAL
Table of Contents
Introduction 1
Specification 2
Safety 3
EMC 4
Installation 6
Operation 7
Maintenance and Repair 8
Instructions en Francais
Sécurité
Installation 10
Fonctionnement 11
Entretien et réparation 12
Bedienungsanleitung auf Deutsch
Sicherheit 13
Installation 14
Betrieb 15
Wartung und Instandsetzung 16
Istruzioni in Italiano
Sicurezza 17
Installazione 18
Funzionamento 19
Manutenzione 20
Instrucciones en Español
Seguridad 21
Instalación 22
Funcionamiento 23
Maintenimiento 24
Introduction
This series of bench power supplies offer high power outputs (in excess of 350 Watts) in a casing
which is both compact and lightweight when compared with conventional designs. Their high
performance is derived from a regulator design which combines switch-mode and linear
techniques to achieve high efficiency with excellent regulation, transient response and very low
noise.
The supplies feature high accuracy voltage and current metering on bright 0.5" LEDs, overvoltage
and thermal protection, and remote sense terminals. The output operates in constant voltage or
constant current mode with automatic crossover and mode indication. Coarse and fine controls
permit the output voltage to be set within 10 mV and the current limit control is logarithmic to give
good resolution at low current settings.
The supplies have a robust steel case which is half-rack width (3U height). They are Safety
Class I, Installation Category II instruments which meet EN61010-1 safety requirements and
comply with EN61326-1 EMC standard.
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Specification
OUTPUT SPECIFICATIONS
Voltage Range: Nominally 0-35V (35V/10A), Nominally 0-18V (18V/20A)
Current Range: Nominally 0-10A (35V/10A), Nominally 0-20A (18V/20A)
Output Voltage Setting: By coarse and fine controls; 10mV setting resolution.
Output Current Setting: By single semi-logarithmic control; 10mA setting resolution.
Output Mode: Constant voltage or constant current with automatic crossover.
Output Switch: Electronic. Preset voltage and current displayed when off.
Output Terminals: 4mm terminals on front panel, screw terminals at rear.
Sensing: Remote via rear panel screw terminals or direct via shorting strip (supplied).
Output Impedance:
<1mΩ in constant voltage mode.
>5kΩ in constant current mode (voltage limit at max.).
Output Protection: Forward protection by Over-Voltage-Protection (OVP) trip; maximum voltage
that should be applied to the terminals is 50V.
Reverse protection by diode clamp for reverse currents up to 3A.
OVP Range: 10% to 110% of maximum output voltage set by front panel screwdriver
adjustment.
OVP Delay: <200µs
Load & Line Regulation: <0.01% of maximum output for 90% load change or 10% line change.
Ripple & Noise: <1mV rms typical in constant voltage
<3mA rms typical in constant current.
HF Common Mode
Noise:
Typically <3mV rms, <10mV peak.
Transient Response: 20µs to within 50mV of setting for 90% load change.
Temperature Coefficient: Typically <100 ppm/°C.
Protection Functions: Overvoltage trip. Regulator overtemperature. Sense miswiring.
Status Indication: Output off lamp. Constant voltage mode lamp
Constant current mode lamp. Trip message on display.
METER SPECIFICATIONS
Meter Types: Dual 4 digit meters with 12.5mm (0.5") LEDs. Reading rate 4Hz.
Meter Resolution: 10mV, 10mA
Meter Accuracy: Voltage 0.2% of reading ± 1 digit, current 0.5% of reading ± 1 digit.
GENERAL
AC Input Voltage: 110V-120V AC or 220V-240V AC ± 10%, 50/60Hz. Installation Category II.
Power Consumption: 600VA max.
Operating Range: 5°C to +40°C, 20% to 80% RH.
Storage Range: –40°C to +70°C.
Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.
Size: 210 x 140 x 385mm (W x H x D), half rack width x 3U height
(optional rack mounting kit available)
Weight: 5kg.
Safety: Complies with EN61010-1
EMC: Complies with EN61326-1
2
Safety
This power supply is a Safety Class I instrument according to IEC classification and has been
designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment
for Measurement, Control and Laboratory Use). It is an Installation Category II instrument
intended for operation from a normal single phase supply.
This instrument has been tested in accordance with EN61010-1 and has been supplied in a safe
condition. This instruction manual contains some information and warnings which have to be
followed by the user to ensure safe operation and to retain the instrument in a safe condition.
This instrument has been designed for indoor use in a Pollution Degree 2 environment in the
temperature range 5°C to 40°C, 20% - 80% RH (non-condensing). It may occasionally be
subjected to temperatures between +5°C and –10°C without degradation of its safety. Do not
operate while condensation is present.
Use of this instrument in a manner not specified by these instructions may impair the safety
protection provided. Do not operate the instrument outside its rated supply voltages or
environmental range.
WARNING! THIS INSTRUMENT MUST BE EARTHED
Any interruption of the mains earth conductor inside or outside the instrument will make the
instrument dangerous. Intentional interruption is prohibited. The protective action must not be
negated by the use of an extension cord without a protective conductor.
When the instrument is connected to its supply, terminals may be live and opening the covers or
removal of parts (except those to which access can be gained by hand) is likely to expose live
parts. The apparatus shall be disconnected from all voltage sources before it is opened for any
adjustment, replacement, maintenance or repair. Capacitors inside the power supply may still be
charged even if the power supply has been disconnected from all voltage sources but will be
safely discharged about 10 minutes after switching off power.
Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided
as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of
the hazard involved.
If the instrument is clearly defective, has been subject to mechanical damage, excessive moisture
or chemical corrosion the safety protection may be impaired and the apparatus should be
withdrawn from use and returned for checking and repair.
Make sure that only fuses with the required rated current and of the specified type are used for
replacement. The use of makeshift fuses and the short-circuiting of fuse holders is prohibited. Do
not wet the instrument when cleaning it.
The following symbols are used on the instrument and in this manual:-
Earth (ground) terminal.
mains supply OFF.
l
mains supply ON.
alternating current (ac)
direct current (dc)
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EC Declaration of Conformity
We Thurlby Thandar Instruments Ltd
Glebe Road
Huntingdon
Cambridgeshire PE29 7DR
England
declare that the following power supplies:
TSX3510, TSX1820
meet the intent of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC.
Compliance was demonstrated by conformance to the following specifications which have been
listed in the Official Journal of the European Communities.
EMC
Emissions: a) EN61326-1 (2006) Radiated, Class B
b) EN61326-1 (2006) Conducted, Class B
c) EN61326-1 (2006) Harmonics, referring to EN61000-3-2 (2006)
Immunity: EN61326-1 (2006) Immunity Table 1, referring to:
a) EN61000-4-2 (1995) Electrostatic Discharge
b) EN61000-4-3 (2006) Electromagnetic Field
c) EN61000-4-11 (2004) Voltage Interrupt
d) EN61000-4-4 (2004) Fast Transient
e) EN61000-4-5 (2006) Surge
f) EN61000-4-6 (2007) Conducted RF
Performance levels achieved are detailed in the user manual.
Safety
EN61010-1 Installation Category II, Pollution Degree 2.
CHRIS WILDING
TECHNICAL DIRECTOR
1 May 2009
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EMC
This instrument has been designed to meet the requirements of the EMC Directive 2004/108/EC.
Compliance was demonstrated by meeting the test limits of the following standards:
Emissions
EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use. Test limits used were:
a) Radiated: Class B
b) Conducted: Class B
c) Harmonics: EN61000-3-2 (2006) Class A; the instrument is Class A by product category.
Immunity
EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and
Laboratory Use.
Test methods, limits and performance achieved are shown below (requirement shown in
brackets):
a) EN61000-4-2 (1995) Electrostatic Discharge : 4kV air, 4kV contact, Performance A (B).
b) EN61000-4-3 (2006) Electromagnetic Field:
3V/m, 80% AM at 1kHz, 80MHz – 1GHz: Performance A (A) and 1.4GHz to 2GHz:
Performance A (A); 1V/m, 2.0GHz to 2.7GHz: Performance A (A).
c) EN61000-4-11 (2004) Voltage Interrupt: ½ cycle and 1 cycle, 0%: Performance A (B);
25 cycles, 70%: Performance A (C); 250 cycles, 0%: Performance B (C).
d) EN61000-4-4 (2004) Fast Transient, 1kV peak (AC line), 0·5kV peak (signal connections),
Performance A (B).
e) EN61000-4-5 (2006) Surge, 0·5kV (line to line), 1kV (line to ground), Performance A (B).
f) EN61000-4-6 (2007) Conducted RF, 3V, 80% AM at 1kHz (AC line only; signal
connections <3m, therefore not tested), Performance A (A).
According to EN61326-1 the definitions of performance criteria are:
Performance criterion A: ‘During test normal performance within the specification limits.’
Performance criterion B: ‘During test, temporary degradation, or loss of function or
performance which is self-recovering’.
Performance criterion C: ‘During test, temporary degradation, or loss of function or
performance which requires operator intervention or system reset occurs.’
Cautions
To ensure continued compliance with the EMC directive observe the following precautions:
a) Connect the generator to other equipment using only high quality, double−screened cables.
b) After opening the case for any reason ensure that all signal and ground connections are
remade correctly and that case screws are correctly refitted and tightened.
c) In the event of part replacement becoming necessary, only use components of an identical
type, see the Service Manual.
5
Installation
Mains Operating Voltage
Check that the instrument operating voltage marked on the rear panel is suitable for the local
supply. Should it be necessary to change the operating voltage, proceed as follows:
1. Ensure that the instrument is disconnected from the AC supply.
2. Remove the 6 screws holding the case upper and lift off the cover.
3. Change the appropriate zero-ohm links beside the transformer on the pcb:
Link LK5 only for 230V operation
Link LK1 and LK3 only for 115V operation
4. Re-assemble in the reverse order.
5. To comply with safety standard requirements the operating voltage on the rear panel must be
changed to clearly show the new voltage setting.
Mains Lead
When a three core mains lead with bare ends is provided this should be connected as follows:
BROWN - MAINS LIVE
BLUE - MAINS NEUTRAL
GREEN/YELLOW - EARTH
Safety Earth Symbol
When fitting a fused plug a 5 amp fuse should be fitted inside the plug. As the colours of the
wires in the mains lead of this apparatus may not correspond with the coloured markings
identifying the terminals in your plug proceed as follows:
The wire which is coloured green-and-yellow must be connected to the terminal in the plug which
is marked by the letter E or by the safety earth symbol shown above or coloured green or greenand-yellow.
The wire which is coloured blue must be connected to the terminal which is marked with the letter
N or coloured black.
The wire which is coloured brown must be connected to the terminal which is marked with the
letter L or coloured red.
WARNING! THIS APPARATUS MUST BE EARTHED.
Any interruption of the protective conductor inside or outside the apparatus or disconnection of
the protective earth terminal is likely to make the apparatus dangerous. Intentional interruption is
prohibited.
6
Operation
Output Setting
With the POWER switch on (l) and the OUTPUT push-button switch off (out) the output voltage
and current limit can be accurately set using the three output controls; the left-hand meter
indicates set voltage and the right-hand meter set current.
When the OUTPUT is switched on, the ON LED and the CV (constant voltage) LED will light; the
left-hand meter continues to show the set voltage but the right-hand meter now shows actual
current drawn. Alternate presses of the I METER DAMPING button will switch current meter
damping in and out; with damping switched in the DAMPED LED will be lit and the average value
of a varying load current will be read.
If the output goes into current limit the CI (constant current) LED will light instead of the CV LED
and the left-hand meter will now show the actual voltage at the output terminals; the right-hand
meter will continue to show the set current limit.
At any time, the set voltage and set current levels can be reviewed by pressing the CHECK V/I
button.
Outputs from several supplies may be connected in series or parallel to produce higher voltages
or higher currents respectively. Care must be taken when connecting supplies in series to ensure
that the maximum voltage rating of any output terminal (300V peak maximum with respect to true
ground) is not exceeded.
Connection to the Load
Connection to the front panel output terminals can be made with 4mm plugs, spade terminals or
wire ends. To minimise voltage drop, the connecting leads to the load should be of an adequate
wire gauge and be kept short. Load wires should also be twisted together to minimise
inductance.
To overcome errors introduced by connecting lead resistance at higher currents the remote
sensing facility should be used (10 mΩ of lead resistance will drop 0.2 Volt at 20 Amps). Remove
the two shorting links made between the rear output and sense terminals and connect the sense
terminals directly to the load; the power connections may be made from either the front or the
rear terminals.
To ensure good coupling between the output and sense, the sense wires should be twisted with
their corresponding output leads before the output leads are twisted together.
The voltage drop in each output lead must not exceed 1 Volt.
The shorting links should be re-made between the rear sense and output terminals when remote
sensing is not being used. However, the sense connection is also made internally through a low
value resistor and only a small error between the set and actual voltage will result if the links are
left disconnected.
The output is fully floating and either terminal can be connected to ground or raised by up to
300V peak above true ground; however, such voltages are hazardous and great care should be
taken.
The current limit control can be set to limit the continuous output current to levels down to 10mA.
However, in common with all precision bench power supplies, a capacitor is connected across the
output to maintain stability and good transient response. This capacitor charges to the output
voltage, and short circuiting of the output will produce a short current pulse as the capacitor
discharges which is independent of the current limit setting.
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