Aim TTi EL-R SERIES INSTRUCTION MANUAL [ml]

EL-R SERIES

Linear Bench Power Supplies

Table of Contents

Introduction 2 Specification 2 Safety 4 Installation 5 Connections 6 Operation - Main Outputs 6 Operation – Auxiliary Output 7 Operation - General 8 Maintenance 8

Instructions en Francais

Sécurité 9 Installation 10 Connexions 11 Fonctionnement - Sorties principales 11 Fonctionnement – Sortie Auxiliaire 12 Fonctionnement - Généralités 13 Maintenance 13

Bedienungsanleitung auf Deutsch

Sicherheit 14 Installation 15 Anschlüsse 16 Betrieb - Hauptausgänge 16 Betrieb – Hilfsausgang 17 Betrieb - Allgemein 18 Wartung 18

Istruzioni in Italiano

Sicurezza 19 Installazione 20 Collegamenti 21 Funzionamento - Uscite principali 21 Funzionamento – Uscita Ausiliaria 22 Funzionamento - Generale 23 Manutenzione 23

Instrucciones en Español

Seguridad 24 Instalación 25 Conexiones 26 Operación - Salidas principales 26 Operación – Salida Auxiliar 27 Operación - General 28 Mantenimiento 28

0 to 56V minimum (EL561R)

0A to 5A minimum (EL155R)

Voltage Setting:

By coarse and fine controls.

Current Setting:

By single logarithmic control.

Operating Mode:

Constant voltage or constant current with automatic cross-over.

Output Switch:

Electronic. Preset voltage and current displayed when off.

Output T erminals:

Universal 4mm safety binding posts on 19mm (0.75”) pitch.

remote connection.

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

Introduction

The EL-R series provides medium levels of power (up to 125 watts) in a compact and attrac t ive case style using linear regulation.

High resolution controls allow precise setting of voltage and curr ent levels which are indicated on accurate and highly legible digital meters.

Excellent line and load regulation is matched by very low noise and good transient response. Improved power efficiency ensures that the units require no fan cooling. Remote sense terminals are provided so that good regulation can be maintained across remote loads at high current.

The EL302RD has two independent isolated outputs each with a 0 to 30V, 0 to 2A capability. The outputs operate in constant voltage or constant current mode with autom at ic cr os sover and m ode indication. Each output has its own on-off switch. The outputs can be wired in either series or parallel to provide voltages up to 60 volts or currents up to 4 amps. The EL302RT has, in addition, an Auxiliary ‘logic voltage’ output with a 2A current capability. This output can be preset between 1.5 volts and 5 volts via a front panel control.

The EL155R, EL183R, EL301R, EL302R, EL303R and EL561R are single output supplies capable of supplying up to 15V/5A, 18V/3.3A, 30V/1A, 30V/2A, 30V/ 3A or 56V/1.1A respectively.

The EL-R series incorpor at es separat e dig ital voltage and current meters on each output. The meters use bright 14mm ( 0. 56” ) LED displays and have an update rate of 4 per second providing near instantaneous response. Simultaneous metering of voltage and curr ent provides accurate information “at a glance” and avoids any possibility of misinter pr etat ion. When an output switch is set to “off”, the cur r ent limit setting is displayed enabling conditions to be set before the load is connected. W it h the right-hand main output off the right-hand meters can be used to momentarily display the preset Auxiliary voltage and current limit.

The EL-R series has been designed to meet the st ringent requirements of relevant IEC standards for safety and EMC. All outputs are intrinsically short circuit proof, and are protect ed against external voltages and reverse currents.

Specification

MAIN OUTPUTS

Voltage Range: 0V to 15V minimum (EL155R)

0V to 18V minimum (EL183R) 0V to 30V minimum (EL301R, EL302R, EL303R, EL302RD, EL302RT)

Current Range: 0A to 1A minimum (EL301R)

0A to 1.1A minimum (EL561R) 0A to 2A minimum (EL302R, EL302RD, EL302RT) 0A to 3A minimum (EL303R) 0A to 3.3A minimum (EL183R)

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

Output Protection: Outputs will withstand forward voltages of up to 20V above the rated

Load Regulation:

<0.01% of maximum output for 90% load change, using remote sense.

Line Regulation:

<0.01% of maximum output for 10% line change.

(20MHz bandwidth)

Transient Load Response:

<20µs to within 50mV of set level for 5% to 95% load change.

Temperatur e Coefficient:

Typically <100ppm/°C.

Status Indication:

Output on lamp. Constant current mode lam p.

Meter Types:

Dual 4 digit meters with 14mm ( 0.56") LEDs. Reading rate 4 Hz.

Meter Resolutions:

10mV, 1m A.

Current 0.5% of reading ± 3 digits.

Voltage:

Variable <1.5V to >5V by front panel control.

Meter Voltage Accuracy:

0.3% ± 4 digits.

Current Limit:

2A minimum.

protection for currents up t o 3A.

(20MHz bandwidth):

Load Regulation:

<3% for 90% load change.

Line Regulation:

<0.2% for 10% line voltage change.

Status Indication:

UNREG lamp.

AC Input:

230V AC or 115VAC ± 10%, 50/60Hz. Installation Category II.

EL302RD/EL302RT: 320VA max.

Operating Range:

+5ºC to +40ºC, 20% to 80% RH.

40ºC to + 70ºC.

Environmental:

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

instrument from http://www.aimtti.com/support (serial no. needed).

Dual & Triple: 260 x 160 x 295 mm (WxHxD).

EL302RD/EL302RT: 7.4kg.

Ripple & Noise:

Typically <1mVrms, constant voltage mode.

METER SPECIFICATIONS (Main Outputs)

Meter Accuracies: Voltage 0.3% of reading ± 3 digits.

AUXILIARY LOGIC OUTPUT (EL302RT only)

Output Protection: Output will withstand up to 7V forward voltage. Diode clamp reverse

Ripple & Noise

Typically <5mVrms, <15mVpk-pk (CV mode).

GENERAL

Power Consumption: EL301R: 85VA max;

EL302R/EL183R/EL561R: 160VA max; EL155R/EL303R: 275VA max;

Storage Range:

Safety & EMC: Complies with EN61010-1 & EN3126-1.

Size: Singles: 140 x 160 x 295 mm (WxHxD).

−

For details, download the EU Declaration of Conformity for t his

Weight: EL301R: 3.1kg;

EL302R/EL183R/EL561R: 4.1kg; EL155R/EL303R: 4.5kg;

Safety

This power supply is a Safety Class I instrument according to I EC 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 Laboratory Use). I t 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 to r etain the inst rument in a safe condition.

This instrument has been designed f or indoor use in a Pollution Deg r ee 2 environment in t he 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 INSTRUMENT 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 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 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 chec king and repair.

Make sure that only fuses with the required rated c ur r ent 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.

mains supply ON. alternating current (ac)

direct current (dc)

Model

230V

115V

30V/1A

800mA (T)

1.6A (T)

30V/2A; 18V/3.3A; 56V/1.1A

1.25A (T)

2.5A (T)

30V/3A; 15V/5A

1.6A (T)

3.15A (T)

Dual and Triple

2.5A (T)

4A (T)

Mains Operating Voltage

Check that the instrument oper ating voltage marked on the rear panel is suitable for the local supply. Should it be neces sar y to change the operating voltage, proceed as follows:

1. Ensure that the instrument is disconnect ed from the AC supply.

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

3. Change the transformer c onnections following the diagram below:

230V Operation 115V Operat ion

BLUE BROWN BLUE BROWN

4. Re-assemble in the reverse order.

5. To comply with safety standard req uir em ents t he oper ating voltage marked on the rear panel must be changed to clearly show the new voltage setting.

Fuse

The AC fuse is located in the fuse drawer in the lower part of the IEC inlet connector. To change the fuse remove the line cord and open the f use dr awer with a suitable tool.

The correct fuse type is 20 x 5mm 250V HBC time-lag with the following rating:

Installation

Make sure that only fuses with the required current rating and of the specified type are used for replacement. The use of makeshif t fuses and the short-circuiting of fuseholders are prohibited.

Mains Lead

When a three c or e m ains lead with bare ends is provided this should be connect ed as follows:

As the colours of the wires in the mains lead of this apparatus m ay not cor r es pond with the coloured markings identifying t he 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.

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.

BROWN - MAINS LIVE BLUE - MAINS NEUTRAL GREEN/YELLOW - EARTH Safety Earth Symbol

WARNING! THIS INSTRUMENT MUST BE EARTHED.

Connections

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

OUTPUT. Bot h ar e fully floating and either can be connected to gr ound. 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

Switching On

The POW ER switch is located at the bottom left of the f r ont panel. When the POWER switch is turned on ( shows Volts and Amps.

l ) the right hand meter br iefly indicates the firmware revision before the display

Setting Up the Output

With the PO WER switch on (l) and the output OFF the output voltage and current limit can be accurately preset using the VOLTAGE and CURRENT controls; the left-hand m eter shows the set voltage and the right-hand meter shows the set m aximum c ur r ent .

When the out put switch is switched ON, t he actual voltage and the right-hand meter t he actual load current.

Constant Voltage

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

Constant Current

is connected to the chassis and safety eart h ground.

Operation - Main Outputs

lamp lights; the left-hand meter now shows the

If the load resistance is low enough such that, at the 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 adjust ed by the CURRENT control and the VOLTAGE contr ols s et t he maximum voltage that can be generated.

The CC lamp lights to show constant current mode.

Instantaneous Current Output

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 current pulse as the capacitor discharges which is independent of the current limit setting .

Efficiency

To improve efficiency at low output levels the overhead voltage to the output r egulators is automatically switched by a relay to a lower voltage; hysteresis at the threshold point prevents unnecessary switching when the output voltage is set at about that level. Apart from an audible ‘click’ the user will be unaware that the relay has switched; there will be no disturbance on the output. The higher power 15V/5A and 30V/3A models use elect r onic pr e-regulation, instead of relay control, to maintain a low overhead voltage.

Protection

The output has intrinsic short-cir cuit pr ot ec t ion and is pr ot ected from reverse voltages by a diode; the continuous reverse current must not exceed 3 Amps, although transients can be much higher.

In common with all series regulated single-ended power supplies, the unit is not capable of sinking current provided from an exter nal sour ce.

If a voltage greater than t he set output voltage of the unit is applied from an external source, the internal regulator will turn off, no current will flow, and t he voltage m et er will read the applied voltage. No damage will result providing the applied voltage does not exceed the maximum output voltage of the power supply by more than 20 Volts. Application of a voltage greater than this is prohibited.

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 20mΩ connecting leads will drop 0.2V at 5 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 onnected to the output at the load instead of at t he 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 ensur e good coupling between each output and sense lead. This can be done either by twisting the leads together or by using c oaxially screened cable (sense through the inner). An electrolytic capacitor directly across the load connection point may 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.

Output Voltage

The output voltage can be set between 1.5V and 5.0V using the front panel rotary adjustment beside the centre terminals. With the right-hand main out put O FF, pressing the SHOW AUX PRESET button will display the AUX output voltage and cur r ent limit on the right-hand meters.

Current Limit

The output will go into current limit above 2A; the UNREG lamp lights in this condition.

Protection

The output is protected against exter nal forward voltages up to 16 Volts.

Operation – Auxiliary Output

Connection to the Load

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

Series or Parallel Connection with Other Outputs

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.

The maximum permissible voltage between any terminal and earth ground ( maximum permissible voltage between either terminal of one output and any term inal of another output on the same supply is also 300VDC.

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.

Operation - General

) is 300VDC; the

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 s et t ings.

Ventilation

The power supply can generate significant heat at full power. The supply relies on convection cooling only and it is therefore important that ventilation is never rest r ict ed if performance and safety are to be maintained.

The Manufacturers or their ag ents overseas will provide repair for any unit developing a fault. Where owners wish to undertake t heir own maintenance work , this should only be done by skilled personnel in conjunction with the service manual which may be purchased directly from the Manufacturers or their agents overseas.

Cleaning

If the PSU requires cleaning use a clot h t hat is only lightly dampened with water or a mild detergent. Polish the display window with a soft dry cloth.

Maintenance

WARNING! TO AVOID ELECTRIC SHOCK, OR DAMAGE TO THE PSU, NEVER ALLOW WATER TO GET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR DISPLAY WINDOW NEVER CLEAN WITH SOLVENTS.

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