Aim TTi EX752M INSTRUCTION MANUAL [ml]

EX752M

75V/150V Multi-mode Dual DC Power Supply

INSTRUCTION MANUAL

Table of Contents

Introduction 2 Specification 2 Safety 4 Installation 5 Connections 5 Operation 6 Maintenance 8

Instructions en Francais 9 Bedienungsanleitung auf Deutsch 14 Istruzioni in Italiano 19 Instrucciones en Español 24

0V to 150V minimum, Mode C.

0A to 4A minimum, Mode B.

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”) spacing

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

<0.1% of maximum output for a 90% load change (Mode C).

Line Regulation:

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

(20MHz bandwidth):

(Mode A).

Temperature Coeff icient:

Typically < 100ppm / ° C

Status Indication:

Output on lamp. Constant current mode lam p.

Introduction

The EX752M is a dual output 300 watt PSU with Multi-Mode capability in a compact and attractive case.

The Multi-Mode capability enables it to operate as a dual power supply with two independent and isolated outputs, or as a single power supply of double the power. As a dual, each out put provides 0 to 75V at 0 to 2A (Mode A). As a single the output can be selected as either 0 to 75V at 0 to 4A (Mode B) or 0 to 150V at 0 to 2A (Mode C). In single modes, the unused half of the unit becomes completely inoperative and its displays are blanked.

The EX series incorporates separate digital voltage and current m eters 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 etation. When an output s witch is set to “off”, the cur r ent limit setting is displayed enabling conditions to be set bef or e t he load is connected.

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.

The EX752M has been designed to meet the string ent requirements of relevant IEC standards for safety and EMC, including harmonics emissions. All outputs are intrinsically short circuit proof, and are protected against external voltages and reverse curr ents.

OUTPUTS

Voltage Range: 0V to 75V minimum, Modes A and B.

Current Range: 0A to 2A minimum, Modes A and C.

Output Protection: Output will withstand forward voltage of up to 85V (Modes A and B) or

Load Regulation: <0.01% of maximum output for a 90% load change (Modes A & B).

Ripple & Noise

Specification

170V (Mode C).

Typically < 2m Vrms, <15mV pk-pk, constant voltage mode.

Transient Response:

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

Mode Selection:

By front panel rotary switch.

Mode A:

Independent outputs each capable of 0-75V at 0-2A.

Output 1 disabled.

Meter Types:

Dual 3 digit meters with 14mm (0.56") LEDs. Reading rate 4 Hz.

Meter Resolutions:

100mV, 10mA

Current 0.6% of reading ± 1 digit

Operating Modes:

Output 1 meters are blanked in Modes B and C.

AC Input:

110V-240V AC ±10%. I ns tallation 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

OPERATING MODES

Mode B:

Mode C: Output 2 only active, 0-150V at 0-2A.

METER SPECIFICATIONS

Meter Accuracies: Voltage 0.3% of reading ± 1 digit,

GENERAL

Output 2 only active, 0-75V at 0-4A.

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

For details, request the EU Declaration of Conformity for this

alternating current (ac)

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 Electrical 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 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 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 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 t ype are used for replacement. The use of makeshift fuses and the short-circuit ing 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.

direct current (dc)

Caution – risk of danger.

manual) to find out the nature of the potential hazard and any actions which have to be taken.

Refer to the documentation (this

be taken when using the power supply at voltages above this level.

Mains Operating Voltage

This instrument has a universal input range and will operate fr om a nominal 115V or 230V mains 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 appr oved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end. To determine the minimum current rating of the lead-set for the intended AC supply, refer to the power rating information on the equipment or in the Specification.

Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous. Intentional interruption is prohibited.

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 t hat ventilation is never restricted if perf or mance and safety are to be maintained.

Installation

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. Connect to one or both outputs as appropriate for the selected Mode, see Operation section.

Warning! Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must

The universal safety binding posts used for the out put meet the requirements for reinforced insulation for voltages up to 250Vdc because creepage and clearance to the terminal contacts is >2.5mm even with the binding post fully open. However, it is highly recommended that the binding posts are usually fully tightened and that connections are only made using leads fi tted with

fixed-shroud 4mm safety plugs. Make sure that the circuit to whi ch connect ions are made is appropriately insulated; no accessible parts of the external circuit should become hazardous live in normal or single faul t condi tion as defined by EN61010-1.

Always make connections to the instrument w i th the OUTPUT off.

The terminal marked

is connected to the chassis and safety earth ground.

powered, and to the unit itself, may occur if t he m ode is switched with either outp u t still on.

one another. The voltage range on each output is 0-75V and the cur rent range 0-2A.

mode is changed and the current limit set t o t he des ired value bef ore the output is switched on.

The operation of both outputs is identical in Mode A (independent mode); the following description applies to both. In Mode B and Mode C only Output 2 is active and Output 1 is disabled; the description therefore only applies to Out put 2, see Mode Selection section.

Setting Up the Output

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

Operation

When the the actual voltage and the right-hand meter t he ac t ual load current.

output switch is switched on, the ON lamp lights; the left-hand meter now shows

Constant Voltage

The output voltage is adjusted using the coar se 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 gr eat er 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 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 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 the current limit setting .

Mode Selection

The three operating modes are s elect ed by the front panel rotary switch situated between the terminals.

Caution. Turn both outputs off before changing mode. Possible damag e to the circuit being

Mode A: With the switch in this position the outputs operate independently and are isolated from

Mode B: With the switch in this posit ion only Output 2 is active; the voltage range is 0-75V and

the current range is 0-4A. The controls of Output 1 are inoperative and the display is blanked. The terminals of Output 1 ar e isolat ed from those of Output 2.

Note that with the output switch of Output 1 in the ‘ON’ position the Output lamp st ill lights but t he terminals remain open-circuit.

Note also that the range and scaling of the current limit control doubles when changing from Mode A to Mode B, i. e. with the control set for a 1.5A limit in Mode A, the limit becomes 3A in Mode B. To avoid possible damage to the circuit being t es t ed the outputs should be switched off before the

before it is switched on.

All connections to the terminals must be made with the output switched off on all units.

Mode C: With the switch in this pos it ion only Output 2 is act ive; t he voltage range is 0-150V and the current range is 0-2A. The controls of Output 1 are inoperative and the display is blanked. The red terminal of Output 1 is isolated but the black terminal remains connected internally to the black terminal of Output 2.

Note that when the output switch of Output 1 is in the ‘O N’ position the Output lamp st ill lights but the red terminal remains open-circuit.

Note also that the range and scaling of the voltage controls of Output 2 doubl e when changing from Mode B to Mode C, i.e. with the controls set for 60V in Mode B the output voltage becomes 120V in Mode C. Care should therefore be taken to ensure t hat the outputs are switched off before the mode is changed and that the output is set to t he cor r ec t 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.

The output is protected against exter nally applied forward voltages of up to 85V (Modes A and B) or 170V (Mode C).

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.

Warning! Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must be taken when using the power supply at voltages above this level.

It is highly recommended that connections are onl y made using leads fi t t ed with fixedshroud 4mm safety plugs. Make sure that the circui t t o which connections are made i s appropriately insulated; no accessible parts of the external circuit should become hazardous live in normal or single faul t condi tion as defined by EN61010-1.

Always make connections to the instrument w i th the OUTPUT off.

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.

Warning! Voltages above 70Vdc are hazardous live according to EN 61010-1 and great care must be taken when using the power supply at voltages above this level

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.

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

) 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 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 mode, units can be connected in parallel to provide a current equal to the sum of t he c ur r ent limit settings.

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 f unction of the fuse is to make the instrument saf e 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 specif ied t ype are used for replacement. The use of makeshift fuses and the short-circuiting of fuse-holders is prohibited.

To replace a fuse, first disconnect the instrum ent from the AC supply. Remove the 6 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 us e 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 G ET INSIDE THE CASE. TO AVOID DAMAGE TO THE CASE OR DISPLAY WINDOW NEVER CLEAN WITH SOLVENTS.

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