TTI PL154, PL320, PL320QMD, PL320QMT, PL330 Instruction Manual

THURLBY THANDAR INSTRUMENTS

PRECISION LINEAR POWER SUPPLIES

PL SERIES

INSTRUCTION MANUAL

Table of Contents

Specification 2
Safety 4
EMC 6
Installation 7
Connections 8
Operation 9
Maintenance 12

Instructions en Francais

Sécurité 13
Installation 14
Fonctionnement 16
Entretien 19

Bedienungsanleitung auf Deutsch

Sicherheit 20
Installation 21
Betrieb 23
Wartung 27

1

Specification

MAIN OUTPUT(S)

Output Range: Nominally 0-32V, (PL320/330); 0-15.5V (PL154).

Nominally 0-2·1A (PL320); 0-3·1A (PL330); 0-4A (PL154).
Output Voltage Setting: By coarse and fine controls; resolution <5mV across the range.
Output Current Setting: By single logarithmic control.
Output Mode: Constant voltage or constant current modes with automatic cross-over.

Decimal points flash to indicate constant current mode.
Configuration Selection:

(QMD and QMT only)

Isolated, True parallel, Series, or Series Tracking via front panel switches.

Output Switch: Isolates the output and permits voltage and current limits to be set up before

connecting the load.
Output Terminals: 4mm terminals on 19mm (0·75") spacing.
Sensing: Remote via 4mm terminals or direct via shorting links (provided).
Output Impedance:

Constant Voltage:
Constant Current:

<5 mΩ at 1kHz.

Typically 50 kΩ with voltage limit at maximum.
Output Protection: Up to maximum output voltage +20 Volts forward; diode clamped for reverse

voltages and up to 3A reverse current.
Load & Line Regulation: < 0·01% of maximum output for 90% load change or 10% line change.
Ripple and Noise: Typically <1 mV rms.
Transient Response: < 20 µsec to within 50 mV of setting for 90% load change.
Temperature Coefficient: Typically < 100 ppm/

O

C.
Meter Type: Dual 3·75 digit (4095 count) with 12·5mm (0·5") LEDs. Reading rate 4Hz.
Meter Resolution: 10 mV and 1mA over the entire range.
Meter Accuracy: Voltage 0·1% of reading + 1 digit, current 0·3% of reading + 1 digit.
Current Meter Damping: ~20 ms, switchable to 2 sec for averaging of rapidly varying loads.

LOGIC OUTPUT (PL320QMT & PL330QMT)

Output Voltage Range: 4 to 6 Volts.
Output Current: 0·1 to 4 Amps (PL320QMT); 0·1 to 7 Amps (PL330QMT).
Output Switch: Electronic.
Output Terminals: 4mm terminals on 19mm (0·75") spacing.
Over-Voltage Protection: Above 7 Volts.
Output Protection: Clamped by the over-voltage protection circuit for forward voltages over

7 Volts and up to 1 Amp forward current. Diode clamped for reverse voltages

and up to 3 Amps reverse current.
Load & Line Regulation: < 0·01% of maximum output for 90% load change or 10% line change.
Ripple and Noise: Typically <1 mV rms.

2

Transient Response: < 20 µsec to within 50 mV of setting for 90% load change.
Temperature Coefficient: Typically < 100 ppm/

o

C.

Metering

(PL330QMT

only):

Meter Type:

3·75 digit (4095 count) with 12·5mm (0·5") LEDs. Reading rate 4Hz.

Meter Resolution:
Meter Accuracy:

10 mV and 10 mA
0·5% of reading + 1 digit.

GENERAL

AC Input Voltage: Internally set for 110, 120, 220, 230 or 240VAC 50/60 Hz; operating range

±10% of setting. Installation Category II.

Power Consumption: Single Dual Triple
15V / 4A or 30V / 2A: 160VA 320VA 400VA
30V / 3A: 250VA 500VA 600VA

Operating Range: 5

O

C to 40 OC, 20% to 80% RH.

Storage Range: -20

O

C to +60 OC.

Environmental: Indoor use at altitudes up to 2000m, Pollution Degree 2.

Weight: Single Dual Triple
15V / 4A or 30V / 2A: 5.0kg 9.5kg 12.5kg
30V / 3A: 6.0kg 12.0kg 15.0kg

Size: Single Dual Triple.
155 mm wide 350 mm wide 425 mm wide
All units 170mm high and 265mm deep, except PL330 versions 300mm

deep.
Safety: Complies with EN61010-1.
EMC: Complies with EN61326.

3

Safety

This instrument is Safety Class I 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 1 minute 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.

alternating current (ac)

direct current (dc)

4

EC Declaration of Conformity

We Thurlby Thandar Instruments Ltd
Glebe Road
Huntingdon
Cambridgeshire PE29 7DR
England

declare that the following power supplies:

PL154, PL320, PL320QMD, PL320QMT, PL330, PL330QMD, PL330QMT

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

5

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, 0%: Performance A (B);

1 cycle, 0%: Performance B (B); 25 cycles, 70% and 250 cycles, 0%: Performance B (C).

d) EN61000-4-4 (2004) Fast Transient, 1kV peak (AC line), 0·5kV peak (signal connections),
Performance B (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.

6

Installation

Mains Operating Voltage

Check that the operating voltage of the instrument shown on the rear panel is suitable for the
local supply. Should it be necessary to change the operating voltage range proceed as follows:

1. Ensure that the instrument is disconnected from the AC supply.

2. Remove the screws holding the case upper and handle.

3. Lift off the case upper.

4. If the transformer primary taps are marked: A 0-110-120 B 0-110-120, rewire as follows:

240V operation: Neutral (blue) wire to A0; Link (red) wire from A120 to B0;

Live (brown) wire to B120.

230V operation: Neutral (blue) wire to A0; Link (red) wire from A110 to B0;

Live (brown) wire to B120.

220V operation: Neutral (blue) wire to A0; Link (red) wire from A110 to B0;

Live (brown) wire to B110.

120V operation: Neutral (blue) wire to A0; Link (blue) wire from A0 to B0;

Link (brown) wire from A120 to B120; Live (brown) wire to B120.

110V operation: Neutral (blue) wire to A0; Link (blue) wire from A0 to B0;

Link (brown) wire from A110 to B110; Live (brown) wire to B110.

Alternatively, if the transformer primary taps are numbered 1 to 6, rewire as follows:

230V operation: Neutral (blue) wire to 6; Link (red) wire from 3 to 4;

Live (brown) wire to 1.

115V operation: Neutral (blue) wire to 6; Link (blue) wire from 3 to 5;

Link (red) wire from 2 to 4; Live (brown) wire to 1.

Note: Units factory set to 220, 230 or 240V will have no blue link wire - this must be provided
when converting to 110/115/120V operation. When converting a 110/115/120V unit to
220/230V/240V the blue link wire should be discarded.

5. Reassemble in the reverse order.

6. Change the fuse type if necessary.
Important Note: Safety regulations state that the AC line voltage to which the apparatus is set

must be clearly marked on the outside. If the line voltage setting is changed, it is imperative that
the voltage marked on the label close to the power lead entry point is also changed.

Fuse

The AC fuse is located on the back panel; note that the PL320QMT and PL330QMT have an
additional AC fuse for their logic output sections. The correct fuse type is 20mm x 5mm 250V
HBC time-lag with the following rating:

Model 220/230/240V 110/115/120V

PL320 / PL154 (single) 1·6A (T) 3.15A (T)
PL330 (single) 2A (T) 4A (T)
PL320QMD / PL320QMT 3.15A (T) 6.3A (T)
PL330QMD 4A (T) 8A (T)
PL330QMT 5A (T) 10A (T)

PL320QMT & PL330QMT Logic 0utput: 1.6A (T) 3.15A (T)

7

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.

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

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 or coloured green or green-and-yellow.

The wire which is coloured blue must be connected to the terminal which is marked with the letter
N or coloured blue or black.

The wire which is coloured brown must be connected to the terminal which is marked with the
letter L or coloured brown or red.

If the unit is to be connected to the main supply by fixed wiring, rather than via an AC line plug,
then the protective earth (ground) wire in the 3 core mains lead shall be connected to a protective
conductor before any other connection is made.

WARNING! THIS APPARATUS 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.

Mounting

This instrument is suitable both for bench use and rack mounting. It is delivered with feet for
bench mounting.

Rack kits for mounting supplies in a 19” rack are available from the Manufacturers or their
overseas agents.

Connections

All connections are made from the front panel.
The load(s) should be connected to the positive (red) and negative (black) terminals marked

OUTPUT.
Remote sense connections to the load, if required, are made from the positive (red) and negative

(black) SENSE terminals. The shorting links between OUPTUT and SENSE terminals should be
removed when remote sensing is required. Replace the shorting links (red SENSE to red
OUTPUT, black SENSE to black OUTPUT) when remote sensing is not in use.

The green terminal marked

is connected to the chassis and safety earth ground.

8