TTI EX752M Instruction Manual
EX752M
75V/150V Multi-mode Dual DC Power Supply
INSTRUCTION MANUAL
1
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
2
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 output
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 sing le m odes, 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 pr ovides accurate
information “at a glance” and avoids any possibility of misinterpr etat ion. When an output switch is
set to “off”, the curr ent limit setting is displayed enabling conditions to be set befor e the 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 stringent 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 currents.
Specification
OUTPUTS
Voltage Range: 0V to 75V minimum, Modes A and B.
0V to 150V minimum, Mode C.
Current Range: 0A to 2A minimum, Modes A and 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”) s pacing
Output Protection: Output will withstand forward voltage of up to 85V (Modes A and B) or
170V (Mode C).
Reverse protection by diode clamp for reverse currents up to 3A.
Load Regulation: <0.01% of maximum output for a 90% load change (Modes A & B).
<0.1% of maximum output for a 90% load change (Mode C).
Line Regulation:
<0.01% of maximum output for a 10% line change.
Ripple & Noise
(20MHz bandwidth):
Typically <2m Vrms, <15mV pk-pk, constant voltage mode.
Transient Response:
<200µs to within 50mV of set level for a 5% to 95% load chang e
(Mode A).
Temperature Coefficient :
Typically <100ppm /°C
Status Indication:
Output on lamp. Constant current mode lamp.
3
OPERATING MODES
Mode Selection:
By front panel rotary switch.
Mode A:
Independent outputs each capable of 0-75V at 0-2A.
Mode B:
Output 2 only active, 0-75V at 0-4A.
Output 1 disabled.
Mode C: Output 2 only active, 0-150V at 0-2A.
Output 1 disabled.
METER SPECIFICATIONS
Meter Types:
Dual 3 digit meters with 14mm (0.56") LEDs. Reading r at e 4 Hz.
Meter Resolutions:
100mV, 10mA
Meter Accuracies: Voltage 0.3% of reading ± 1 digit,
Current 0.6% of reading ± 1 digit
Operating Modes:
Output 1 meters are blanked in Modes B and C.
GENERAL
AC Input:
110V-240V AC ±10%. I nstallation 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.
Safety & EMC: Complies with EN61010-1 & EN61326-1.
For details, request the EU Declaration of Conformity for this
instrument via http://www.aimtti.com/support (serial no. needed).
Size:
260 x 160 x 320mm (WxHxD).
Weight:
4.3kg
4
Safety
This power supply is a Safety Class I instrument according to I EC classification and has been
designed to meet the requirements of EN61010-1 (Safety Requirements f or Elect r ical Eq uipm ent
for Measurement, Control and Laboratory Use). It is an Installation Category II instrument
intended for operation from a nor m al 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 inst r um ent 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 bet ween +5°C and –10°C without degr adation 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 instrument outside its rat ed supply voltages or
environmental range.
WARNING ! THIS INSTRUMENT M UST BE EARTHED
Any interruption of the mains earth conductor inside or outside the inst r um ent will make the
instrument dangerous. Int ent ional inter r upt ion is pr ohibited. The prot ect ive action mus t not be
negated by the use of an extension cord without a protective conductor.
When the instr um ent is c onnect ed to its supply, term inals 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 inst r um ent 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 ect ive, has been subject to mechanical damage, excessive
moisture or chemical corrosion the saf et y prot ec t ion m ay 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 cur 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.
l
mains supply ON.
alternating current (ac)
direct current (dc)
Caution – risk of danger.
Refer to the documentation (this
manual) to find out the nature of the potential hazard and any
actions which have to be taken.
5
Installation
Mains Operating Voltage
This instrument has a universal input range and will operate from 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 approved 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.
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.
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 performance and safety are to be maintained.
Connections
All connections are made from the f r ont panel.
The load should be connected to the positive (red) and negative (black ) terminals marked
OUTPUT. Connect to one or both outputs as appropriate f or t he s elect ed Mode, see Oper ation
section.
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 universal safety binding posts used for the output meet the requirements f or r einforced
insulation for voltages up to 250Vdc because creepage and clearance to the t er m inal 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 t t ed with
fixed-shroud 4mm safety plugs. Make sure that the ci r cui t to which connections are made
is appropriately insulated; no accessible parts of the external circuit should become
hazardous live in normal or single fault condition as defined by EN61010-1.
Always make connections to the instrument with the OUTPUT off.
The terminal marked
is connected to the chassis and safety eart h ground.
6
Operation
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 Output 2, see Mode Selection section.
Setting Up the Output
With the POWER 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 meter shows the set
voltage and the right-hand meter s hows the set maximum current.
When the
output switch is switched on, the ON lamp lights; the left-hand m et er now shows
the actual voltage and the right-hand meter t he ac t ual load cur r ent .
Constant Voltage
The output voltage is adjusted using the coarse and fine VOLTAGE controls; the CURRENT
control sets the maximum current that can be supplied.
Constant Current
If the load resistance is low enough such that, at t he out put 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 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 acr os s
the output to maintain stability and good transient response. This capacitor charg es t o t he output
voltage and short-circuiting of the out put will produce a current pulse as t he capacitor dischar ges
which is independent of the current limit setting.
Mode Selection
The three operating modes are select ed by the front panel rotary switch situated between the
terminals.
Caution. Turn both outputs off before changing mode. Possible damag e t o t he c irc uit being
powered, and to the unit itself, may occur if the m ode is switched with either outp u t still on.
Mode A: With the switch in this position the outputs operate independently and are isolated f r om
one another. The voltage range on each output is 0-75V and the current range 0-2A.
Mode B: With the switch in this position 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 are isolated from those of Output 2.
Note that with the output switch of Output 1 in the ‘O N’ position the Output lamp st ill lights but t he
terminals remain open-circuit.
Note also that the range and scaling of t he c ur r ent limit control doubles when changing from Mode
A to Mode B, i. e. with the cont rol set for a 1.5A limit in Mode A, the limit becom es 3A in Mode B.
To avoid possible damage to the circuit being tested the outputs should be switched off before the
mode is changed and the current limit set to the desired value before the output is switched on.
7
Mode C: With the switch in this posit 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 Out put 2.
Note that when the output switch of Output 1 is in the ‘ON’ position the Output lamp st ill lights
but the red terminal remains open-circuit.
Note also that the range and scaling of t he voltage cont r ols of Output 2 double 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 that the outputs are
switched off before the mode is changed and that t he output is set to the correct voltage
before it is switched on.
Protection
The output has intrinsic short-circuit pr otection and is protected from r everse 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 negative (black ) OUTPUT terminals. Both
are fully floating and either can be connected t o 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 only made using leads fi t t ed with fixedshroud 4mm safety plugs. Make sure that the circuit t o which connections are made is
appropriately insulated; no accessible parts of the external circuit should become
hazardous live in normal or single fault condition as defined by EN61010-1.
Always make connections to the instrument with the OUTPUT off.
Series or Parallel Conne ction 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 (
) is 300VDC; the
maximum permissible voltage between either terminal of one output and any terminal of another
output on the same supply is also 300VDC.
All connections to the terminals must be made with the output sw i tched 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 highest
output voltage setting until the current dr awn exceeds its current limit set ting, upon which the
output will fall to that of the next highest setting, and so on. In constant current mode, units can
be connected in parallel to provide a current equal to the sum of the current limit settings.
8
Maintenance
The Manufacturers or their agents overseas will provide repair for any unit developing a fault.
Where owner wish to undertake their 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.
Fuse
The correct fuse type is:
10 Amp 250V HBC time-lag(T), 5 x 20mm.
Note that the main func t ion of the fuse is to make t he inst rument safe and limit damage in the
event of failure of one of t he s witching devices. I f a fuse fails it is therefore very likely that the
replacement will also blow, because t he supply has developed a fault; in such circumstances the
instrument will need to be returned to the manuf act urer for service.
Make sure that only fuses of the req uir ed r ated current and specified type 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 instrument from the AC supply. Remove the 6 cover
securing screws and lift off the cover. Replace the fuse with one of the correct type 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, NEVE R ALLOW
WATER TO G ET INSIDE THE CASE. TO AVO ID DAMAGE TO THE CASE OR DISPLAY
WINDOW NEVER CLEAN WITH SOLVENTS.
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