Aim TTi EX354RD, EX354RT INSTRUCTION MANUAL [ml]

EX354RD & EX354RT

Bench Power Supplies

INSTRUCTION MANUAL

Table of Contents

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

Instructions en Francais

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

Bedienungsanleitung auf Deutsch

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

Istruzioni in Italiano

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

Instrucciones en Español

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

Voltage Range:

0V to 35V minimum.

Current Range:

0A to 4A minimum.

Output Voltage Setting:

By coarse and fine controls.

Output 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”) pit ch.

for remote connection.

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

Load Regulation:

<0.01% of maximum output for 90% load change, using remot e sens e.

Line Regulation:

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

Introduction

The EX354RD and EX354RT provide high levels of power (up to 305 watts) in a compact and attractive case style.

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

Excellent line and load regulation are matched by low noise and good transient response. High power efficiency ensures that the unit remains cool without any fan noise. Remote s ense terminals are provided so that good regulat ion can be m aintained across remote loads at high current.

The EX354RD has two independent and isolated outputs each with a 0 to 35V, 0 to 4A capability. The outputs operate in constant voltage or constant current m ode with autom at ic cr os s -over and mode indication. Each output has its own on-off switch. Where higher voltages or currents are required the outputs can be wired in either series or parallel to provide voltages up to 70 volts or currents up to 8 Amps.

The EX354RT has, in addition, an Auxiliary ‘logic voltage’ output with a 5A current capability. To reflect the increasing usag e of low-voltage logic devices, this output can be preset between

1.5 volts and 5 volts via a front panel control. The total power capability is 280 watts for the dual supply and 305 watts for the triple. The EX-R series incor por at es separat e dig ital voltage and current meters on each main output.

The meters use bright 14m m ( 0· 56” ) LED displays and have an update rate of 4 per second providing near instantaneous response. Simultaneous metering of voltage and cur r ent pr ovides accurate information “at a glance” and avoids any possibility of misinterpretation. When an output switch is set to “off”, the curr ent limit setting is displayed enabling conditions to be set before the load is connected. W ith the right-hand main output off, the right-hand meters c an be used t o momentarily display the preset Auxiliary voltage and current limit.

The EX-R series has been designed to meet t he s t r ingent requirements of relevant IEC standards for safety and EMC, including harmonics emissions. All outputs are intrinsically short circuit proof, and are protec t ed against external voltages and reverse currents.

MAIN OUTPUTS

Specification

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

Output Protection: Output will withstand up to 40V forward voltage.

(20MHz bandwidth):

Transient Response:

<200µs to within 50mV of set level for a 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 r ate 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:

5A minimum.

Diode clamp reverse protection for currents up t o 3A.

Load Regulation:

<0.5% for 90% load change.

Line Regulation:

<0.1% for 10% line voltage change.

(20MHz bandwidth):

change.

Temperatur e Coefficient:

Typically <100ppm/ºC.

Status Indication:

UNREG lamp.

AC Input:

110V - 240V AC ± 10%, 50/60Hz. Installation Category II.

Power Consumption:

500VA 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.

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

Size:

260 x 160 x 320mm (WxHxD).

Weight:

4.3kg

Ripple & Noise

Typically <2mVrms, <10mVpk-pk, constant voltage mode.

METER SPECIFICATIONS (Main Outputs)

Meter Accuracies: Voltage 0.3% of reading ± 3 dig its,

AUXILIARY LOGIC OUTPUT (EX354RT only)

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

Ripple & Noise

Transient Response:

GENERAL

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

Typically <2mVrms, <10mVpk-pk (CV mode).

Typically <200µs to within 50mV of set level for a 5% to 95% load

For details, request the EU Declaration of Conformity for this

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 f or Elect rical Equipment 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 to r etain the inst r um ent 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 s pecified 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 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 s ubj ec t t o 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 specif ied t ype 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 m anual:-

Earth (ground) terminal.

mains supply OFF.

mains supply ON.

alternating current (ac) direct current (dc)

Mains Operating Voltage

This instrument has a universal input range and will operate fr om 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

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

BROWN - MAINS LIVE

Installation

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

When f it t ing 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 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.

Connections

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

OUTPUT. Bot h ar e fully floating and either can be connected to ground. Remote sense connections to the load, if r equired, are made from t he posit ive (+) 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

is connected to the chassis and safety eart h ground.

The operation of both main outputs is identical; the following description applies to both.

Switching On

The POW ER switch is located at the bottom left of the front panel. W hen t he PO WER 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 cur r ent limit c an be accurately preset using the VOLTAGE and CURRENT controls; the left-hand meter shows the set voltage and the right-hand met er s hows the set maximum current.

Operation - Main Outputs

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 s e and fine VOLTAGE controls; the CURRENT control sets the maximum current that c an be supplied.

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 contr ols set the 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 t o 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 .

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.

lamp lights; the left-hand meter now shows the

The output is protected against exter nally applied forward voltages of up to 40V.

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 connected 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 t o 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 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 output OFF, pr ess ing 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 at bet ween 5A and 6A; the UNREG lamp lights in this condition.

Protection

The output is protected against exter nally applied forward voltages of up to 7V.

Connection to the Load

Operation - Auxiliary Output

Operation - General

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 t ouched 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 highes t 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 set ting, 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.

) is 300VDC; the

Ventilation

The power supply is very efficient but nevertheless can generate significant heat at full power. The supply relies on convection cooling only and it is therefore important that ventilation is never restricted if perf or mance and safety are to be maintained.

Fuse

Maintenance

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

The correct fuse type is:

10 Amp 250V HBC time-lag(T), 5 x 20mm .

Note that the main function of the fuse is to make t he inst r um ent safe and limit damage in the event of failure of one of the switching devices. If a fuse fails it is therefore very likely that the replacement will also blow, because the supply has developed a fault; in such circumstances the instrument will need to be returned to the manuf ac t ur er for service.

Make sure that only fuses of the required rated current and specified t ype are used for replacement. The use of makeshift f uses and the short-circuiting of fuse-holders is prohibited.

To replace a f use, first disconnect the instrum ent from the AC supply. Remove the 7 cover securing screws and lift off the cover. Replace the fuse with one of the correct t ype and refit the cover.

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.

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.

+ 21 hidden pages