Thurlby Thandar Instruments CPX400A User Manual [en, de, fr, it]

CPX400A

Dual 60V 20A PowerFlex Power Supply

INSTRUCTION MANUAL

Table of Contents

Specification 2 Safety 4 EMC 6 Installation 7 Connections 7 Operation 8 Maintenance 10 Instructions en Francais 11 Bedienungsanleitung auf Deutsch 16 Istruzioni in Italiano 22 Instrucciones en Español 27

Voltage Range:

0V to 60V

Current Range:

0A to 20A

Power Range:

Up to 420W

Output Voltage Setting:

By coarse and fine controls.

Output Current Setting:

By single logarithmic control.

Outside of this envelope the output becomes unreg ulated.

Output Switch:

Electronic. Preset voltage and current displayed when off.

Output T erminals:

Universal 4mm safety binding posts on 19mm (0·75” ) pitch. 30A max.

remote connection.

Reverse protection by diode clamp for reverse currents up to 3A.

rise excessively.

adjustment.

Constant current: <0.01% of m aximum output

Constant current: <0.05% of m aximum output

(20MHz bandwidth):

mode.

Specification

General specifications apply for the t em per ature range 5°C to 40°C. Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up with no load and calibration at 23°C. Typical specifications are determined by design and are not guaranteed.

OUTPUT SPECIFICATIONS

Operating Mode: Constant voltage or constant current with automatic cross -over pr ovided

that the power demanded stays within the power envelope, see graph.

CPX 400A POWER ENVELOPE

Sensing: Switchable between local and remote. Spring-loaded push terminals for

Output Protection: Forward protection by Over-Voltage Protection (OVP) trip; maximum

voltage that should be applied to the terminals is 70V.

Over-temper at ure Protection: The output will be tripped off if a fault c auses the internal temperature to

OVP Range: 10% to 110% of maximum output voltage set by front panel screwdriver

Line Regulation: Change in output for a 10% line change:

Constant voltage: <0.01% of maximum output

Load Regulation: Change in output for any load change within PowerFlex envelope,

remote sense connected: Constant voltage: <0.01% of maximum output

Ripple & Noise

4mVrms max; typically <2mVrms, <10mV pk-pk, at maximum load, CV

Temperature Coeff icient:

Typically < 100ppm / ° C

Meter Types:

Dual 4 digit meters with 12.5mm (0.5") LEDs. Reading rate 4 Hz.

Meter Resolutions:

10mV, 10mA

Current 0.3% of reading ± 2 digits

Installation Category II.

Power Consumption:

1250VA max.

Operating Range:

+5ºC to +40ºC, 20% to 80% RH.

Storage Range:

−40ºC to + 70ºC.

Environmental:

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

Safety:

Complies with EN61010-1.

EMC:

Complies with EN61326.

rack mounting kit available).

Transient Load Response: <250us to within 50mV of set level for a 5% to 95% load chang e.

Status Indication: Output on lamp.

Constant voltage mode lamp. Constant current mode lamp. Unregulated (power limit) lamp Trip message on display.

METER SPECIFICATIONS

Meter Accuracies: Voltage 0.1% of reading ± 2 digits,

GENERAL

AC Input: 110V – 240V AC ± 10%, 50/60Hz.

Size: 210 x 130 x 375mm (WxHxD) half rack width x 3U height (optional

Weight: 6kg

Safety

This power supply is a Safety Class I instrument according to IEC classification and has been designed to meet the requirem ents of EN61010-1 (Safety Requirements for Elect r ical Eq uipment for Measurement, Control and Laborator y Use). It is an Installation Category II instrument intended for operation from a normal single phase supply.

This instrument has been tested in accordanc e 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 t o retain the instrument in a safe condition.

This instrument has been designed f or 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 spec ified by these instructions may impair the safety protection provided. Do not operate the instrum ent outside its rat ed supply voltages or environmental range.

WARNING ! THIS INS TRUMENT MUST BE EARTHED

Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the instrument dangerous. Int entional 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, m aint enance or repair. Capacitors inside t he 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 s witching 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 def ec t ive, 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 f or 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 m anual:-

Earth (ground) terminal.

Instrument in STAND-BY

mains supply ON. alternating current (ac)

Performance levels achieved are detailed in the user manual.

EC Declaration of Conf ormity

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

declare that the

CPX400A 60V 20A Bench Power Supply

meet the intent of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC. Compliance was demonstrated by conformance t o the following specifications which have been listed in the Official Journal of the European Comm unit ies.

EMC

Emissions: a) EN61326-1 (2006) Radiated, Class B

b) EN61326-1 (2006) Conducted, Class B c) EN61326-1 (2006) Har m onic s, referring to EN61000-3-2 (2006)

Immunity: EN61326-1 (2006) Imm unit y Table 1, r eferring to:

a) EN61000-4-2 (2009) Electrostatic Discharge b) EN61000-4-3 (2006) Electromagnetic Field c) EN61000-4-11 (2004) Voltag e Interrupt d) EN61000-4-4 (2004) Fast Transient e) EN61000-4-5 (2006) Surge f) EN61000-4-6 (2009) Conducted RF

Safety EN61010-1 Installation Category II, Pollution Degree 2.

CHRIS W ILDING TECHNICAL DIRECTOR

2 January 2013

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 t he 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) Harm onics: EN61000-3-2 (2006) Class A; the instrument is Class A by product cat egory.

Immunity

EN61326-1 (2006) EMC product standard for Electrical Equipm ent for Measurement, Control and Laboratory Use.

Test methods, limits and performance achieved are shown below (requirement shown in brackets):

a) EN61000-4-2 (2009) Electrostatic Discharge : 4k V air, 4kV contact, Perfor mance A (B).

EMC

b) EN61000-4-3 (2006) Electromagnetic Field: 3V/m, 80% AM at 1kHz, 80MHz – 1GHz: Performance A

1.4GHz to 2GHz: Performance A (A); 1V/m, 2.0GHz to 2.7GHz: Perfor m anc e A (A). c) EN61000-4-11 (2004) Voltag e Interrupt:

½-cycle, 0%: Peformance A (B); 1 cycle, 0%: Performance B (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 ( DC Out puts) , Performance B (B).

e) EN61000-4-5 (2006) Surge, 0·5kV (line t o line), 1kV (line to ground), Perform ance B ( B) . f) EN61000-4-6 (2009) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output

connections <3m, therefor e 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 t est , temporary degradation, or loss of function or

performance which is self-recovering’. Performance criterion C: ‘During t est, temporary degradation, or loss of function or

performance which requires operator int er vention or s ystem r eset occurs.’ Where Performance B is stated it is because DC Output regulation, or V & I measurement

accuracy, m ay deviate beyond Specification limits under the test conditions. However, the possible deviations are still small and unlikely to be a problem in practice.

(A) and

Note that if operation in a high RF f ield is unavoidable it is good pract ice t o c onnect the PSU to the target system using screened leads which have been passed (together) through an absorbing ferrite sleeve fitted close to the PSU terminals.

Cautions

To ensure continued compliance with the EMC directive observe the following precautions: a) after opening the case for any reason ensure that all signal and ground connect ions ar e

b) In the event of part replacement becoming necessary, only use components of an identical

remade correctly and that case screws are correc t ly refitted and tightened.

type, see the Service Manual.

Mains Operating Voltage

This instrument has a universal input r ange and will operate from a nominal 115V or 230V m ains supply without adjustment. Check that the local supply meets the AC Input requirement given in the Specification.

Mains Lead

Connect the instrument to the AC supply using the mains lead provided. Should a mains plug be required for a different mains outlet socket, a suitably rated and approved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for t he instrument end. To determ ine t he m inimum current rating of the lead-set for the intended AC supply, refer to the power rating information on t he equipment or in the Specification.

Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the instrument dangerous. Int entional interruption is prohibited.

Ventilation

The power supply is cooled by an intelligent multi-speed fan which vents at the rear. Take care not to restrict the air inlets at top, bottom and side panels or the exit at the rear. In rack-mounted situations allow adequate space around the instrument and/or use a fan tray for forced cooling.

Installation

WARNING ! THIS INS TRUMENT MUST BE EARTHED.

Mounting

This instrument is suitable both for bench use and rack mounting. It is delivered with feet for bench mounting. The front feet include a tilt mechanism for optimal panel angle.

A rack kit for mounting one or two of these Half -width 3U high units in a 19” rack is available from the Manufacturers or their overseas agents.

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

OUTPUT. The OUTPUT terminals are rated at 30A. Remote sense connections to the load, if r equired, are made from the positive (+) and

negative (−) SENSE terminals. Switch the LOCAL/REMOTE switch to REMOTE when remote sensing is required. Switch back to LOCAL when remote sensing is not in use.

The terminal marked

Connections

is connected to the chassis and safety eart h ground.

The operation of both outputs is identical; t he following description applies to both.

Switching On

The power switch, located at the bottom left of the front panel, switches between standby ( ) and on ( l ). In standby the auxiliary power circuit remains connected and consumes ~6 Watts.

To fully disconnect fr om t he AC supply unplug the mains cord from the back of the instrument or switch off at the AC supply outlet; make sure that the means of disconnection is readily accessible. Disconnect from the AC supply when not in use.

Setting Up the Output

With the PO WER switch on ( l ) and the OUTPUT switch off the out put voltage and cur r ent limit can be accurately preset using the VOLTAGE and CURRENT controls; the upper meter shows the set voltage and the lower meter shows the set maximum current .

When the O UT PUT switch is switched on, the OUTPUT ON lamp and the CV (constant voltage) lamp light; the upper meter cont inues t o s how the set voltage but the lower meter now shows the actual load current.

Constant Voltage

Operation

The output voltage is adjusted using the coar se and fine VOLTAGE control; the CURRENT control sets the maximum current that c an be supplied.

The CV lamp lights to show constant voltage mode.

Constant Current

If the load resistance is low enough such that, at t he output voltage set, a current greater than the current limit setting would flow, the power supply will automatically move into constant current operation. The current output is adjusted by the CURRENT control and the VOLTAGE controls set the maximum voltage that can be generated.

The CI lamp lights to show constant current mode.

Instantaneous Current Output

The current limit control can be set t o limit the continuous output current to levels down to 10mA. However, in com m on with all precision bench power supplies, a capacitor is connected ac r oss 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 current pulse as the capacitor discharges which is independent of t he c ur r ent limit s et t ing.

Power Limit

The maximum output at different voltage settings is limited by the power envelope illustrated below:

CPX 400A POWER ENVELOPE

The power envelope is set to give 62V/7A, 42V/10A and 20V / 20A under all supply conditions (both outputs loaded); at lower output voltages the output power is rest r ict ed by the 20A current maximum.

When the power limit is exceeded, the stat us indicat ion will change from CV or CI to UNREG. For example, if the supply is set to 20V, with the current limit at maximum, and is connected t o a 2Ω load, 10 Amps will f low and the supply will be in CV mode. As the voltage across the load is increased, the power into the load increases until, at about 29V, the power limit is exceeded and the supply changes from CV to UNREG.

Connection to the Load

The load should be connected to the positive (red) and negative (black) OUTPUT terminals. Both are fully floating and either can be connected to ground.

Remote Sensing

The unit has a very low output impedance, but this is inevitably increased by the resistance of the connecting leads. At high currents this can result in significant differences bet ween the indicated source voltage and the actual load voltage (two 5mΩ connecting leads will drop 0.2V at 20 Amps, for instance). This problem can be minimised by using short, thick, connecting leads, but where necessary it can be completely overcome by using the remote sense f acility.

This requires the sense term inals to be c onnect ed to the output at the load instead of at the source; insert wires into the spring-loaded SENSE terminals and connect directly to the load. Switch the LOCAL/REMOTE switch to REMOTE. To avoid instability and transient response problems, care must be taken to ensure good coupling between each output and sense lead. This can be done either by twisting the leads together or by using coaxially screened cable (sense through the inner). An electrolytic capacitor directly across the load connection point m a y also be beneficial.

The voltage drop in each output lead must not exceed 0.5 Volts. Switch the LOCAL/REMOTE switch back to LOCAL when remote sensing is not in use.

Series or Parallel connection with other units

The outputs of the power supply are fully floating and m ay be used in series with other power supply units to generate high DC voltages up to 300V DC.

WARNING! Such voltages are exceedingly hazardous and great care should be taken to shield the output terminals for s uch use. On no account should the output terminals be touched when the unit is switched on under such use. All connections to the terminals must be made with the power switched off on all units.

It should be noted that the unit can only source current and cannot sink it, thus units cannot be series connected in anti-phase.

The unit can be connected in parallel with others to produce higher currents. Where several units are connected in parallel, the output voltage will be equal to that of the unit with the hig hest output voltage setting until the current dr awn exceeds its current limit s et ting, upon which the output will fall to that of the next highest setting, and so on. In constant current m ode, units can be connected in parallel to provide a current equal to the sum of t he c ur r ent limit settings.

Note that the output terminals are rated at 30A maximum; if two or more outputs are operated in parallel to source higher currents than this the junction should be made at a separate point, not one of the terminals.

Protection

Overvoltage protection (OVP) is fully variable within the range 10% to 110% of the supply's maximum output level. The OVP limit is set via the screwdriver adjustable SET OVP preset potentiometer, accessible through a hole in the front panel. Rotating the preset clockwise increases the limit, which can be read directly on the user display by pressing the button beneath the preset. If the voltage on t he out put exceeds the set OVP for any reason, including an externally forced voltage, the output will be tripped off.

The output will also be tripped off if an attempt is m ade to draw power from the sense wires.

+ 23 hidden pages