GW Instek PSS User Manual

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

CONTENTS PAGE

1. PRODUCT INTRODUCTION......................... ........... ........... ..

1-1. Description……………………………………………… 1-2. Feature…………………………………………………...

2. TECHNICAL SPECIFICATIONS…………………………

3. PRECAUTIONS BEFORE OPERATION…….…………... 3-1. Unpacking the Instrument……………….………….…. 3-2. Checking the Line Voltage…………………..…………. 3-3. Environment……………………………………..……...

4. PANEL INTRODUCTION……………………..…………...

OPERATION METHOD………………………………...…. 5-1. Output Voltage/Current Setting…………………..…… 5-2. Over Voltage/Current Protection Setting……………... 5-3. The Display Contrast Setting.………………………….. 5-4. The Buzzer Setting……………………………………… 5-5. GPIB/RS-232 Interface Setting………………………… 5-6. The Maximum Setting Value…………………………... 5-7. Test Lead………………………………………………... 5-8. The Setting for the GPIB and RS232 Interface………..

MAINTENANCE………………………..………………….. 6-1. Fuse Replacement………………………………………. 6-2. Line Voltage Conversion……………………………….. 6-3. Adjustment and Calibration…………………………… 6-4. Cleaning…………………………………………………

THE SYSTEM DIAGRAM AND DESCRIPTION……….. 7-1.Block Diagram…………………………………………... 7-2.The Operation of the whole circuit……………………...

1 1 1 3 5 5 5 6

7 10 10 11 12 12 12 13 13 13

14 14 14 15 18 19 19 20

USER MANUAL

SAFETY TERMS AND SYMBOLS

These terms may appear in this manual or on the product:

WARNING. Warning statements identify condition or practices that could result in injury or loss of life.

CAUTION. Caution statements identify conditions or practices that could result in damage to this product or other property.

The following symbols may appear in this manual or on the product:

DANGER ATTENTION Protective Earth (ground) Frame or Chassis High Voltage refer to Manual Conductor Terminal Terminal

Terminal

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

FOR UNITED KINGDOM ONLY

NOTE: This lead/appliance must only be wired by competent persons

WARNING: THIS APPLIANCE MUST BE EARTHED

IMPORTANT: The wires in this lead are coloured in accordance with

the following code:

Green/ Yellow: Earth Blue: Neutral Brown: Live (Phase)

As the colours of the wires in main leads may not correspond with the colours marking identified in your plug/appliance, proceed as follows:

USER MANUAL

This cable/appliance should be protected by a suitably rated and approved HBC mains fuse: refer to the rating information on the equipment and/or user instructions for details. As a guide, cable of

0.75mm

should be protected by a 3A or 5A fuse. Larger conductors would normally require 13A types, depending on the connection method used.

Any moulded mains connector that requires removal /replacement must be destroyed by removal of any fuse & fuse carrier and disposed of immediately, as a plug with bared wires is hazardous if a engaged in live socket. Any re-wiring must be carried out in accordance with the information detailed on this label.

The wire which is coloured Green & Yellow must be connected to the

Earth terminal marked with the letter E or by the earth symbol or coloured Green or Green & Yellow.

The wire which is coloured Blue must be connected to the terminal which is marked with the letter N or coloured Blue or Black.

The wire which is coloured Brown must be connected to the terminal marked with the letter L or P or coloured Brown or Red.

If in doubt, consult the instructions provided with the equipment or contact the supplier.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

Declaration of Conformity

GOOD WILL INSTRUMENT CO., LTD.

No. 7-1, Jhongsing Rd., Tucheng City, Taipei County 236, Taiwan

GOOD WILL INSTRUMENT (SUZHOU) CO., LTD.

No.69 Lushan Road, Suzhou New Distri ct Jiang su, Ch ina .

declare that the below mentioned product

PSS-2005, PSS-3203

are herewith confirmed to comply with the requirements set out in the Council Directive on the Approximation of the Law of Member States relating to Electromagnetic Compatibility (89/336/EEC, 93/68/EEC)and Low Voltage Equipment Directive(73/23/EEC, 93/68/EEC). For the evaluation regarding the Electromagnetic Compatibility and Low Voltage Equipment Directive, the following standards were applied:

◎ EMC

EN 61326-1: Electrical equipment for measurement, control and laboratory use –– EMC

Conducted and Radiated Emissions EN 55011: 1991+A1: 1997+A2: 1996

Current Harmonic

EN 61000-3-2: 1995+A1: 1998+A2: 1998 +A14: 2000

Voltage Fluctuation

EN 61000-3-3: 1995

-------------------------

◎ Safety Low Voltage Directive 73/23/EEC & amended by 93/68/EEC

IEC/EN 61010-1: 2001

requirements (1997+A1: 1998)

Electrostatic Discharge EN 61000-4-2: 1995 Radiated Immunity EN 61000-4-3: 1996 Electrical Fast Transients EN 61000-4-4: 1995 Surge Immunity EN 61000-4-5: 1995 Conducted Susceptibility EN 61000-4-6: 1996 Voltage Dips/ Interrupts EN 61000-4-11: 1994

USER MANUAL

1. PRODUCT INTRODUCTION

1-1.Description

PSS-series Programmable Power Supply is controlled by Micro Processor Unit (MPU) that can easily connect communi cation interfa ce RS-232 or GPIB to computer in order to satisfy users’ demand for auto-testing and auto-control.

The voltage and current are completely controlled by a 12 bits D/A Converter with higher resolution and accuracy. Also, the digitalization of system makes a speedy, precise and convenient input of information controlled by keyboard and wheel knob.

The adjustment of voltage/current is made by software calibration without man-made error that will increase the preciseness of the instrumen t .

The function of Over Voltage Protection (OVP) and Over Current Protection (OCP) is set with software and detected with hardware to achieve protected function precisely and speedily in order to secure user s from danger by using the instrument.

1-2. Feature

1) An overall digitalization of programmable interface with high

resolution.

2) The 16×2 LCD Display.

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3) High stability and low draft.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

4) The function of over voltage/current/temperature pro tection.

5) Intelligent control fan (Vary with different output power.)

6) Warning signal by the built-in Buzzer.

7) Step by step calibration procedure.

8) Brand new panel design and the 1/4 rack size reduction volume

design.

9) Wheel knob of Fine and Coarse.

10) IEEE-488.2 and SCPI compatible command setting.

11) Correspond to CE safety regulation.

USER MANUAL

2.TECHNICAL SPECIFICATIONS

SPECIFICATIONS PSS-3203 PSS-2005

Output

Load Effect

Source Effect

Resolution

Program Accuracy (25±5℃)

Ripple & Noise (20Hz~20MHz)

Temperature Coefficient (0~40℃)

Resolution Readback

Accuracy (25±5℃)

Response Time Voltage Up Voltage Down

Readback Temperature Coefficient

Drift

Voltage Current OVP Voltage Current Voltage Current Voltage

Current 1mA(2mA rating current>3.0A) OVP 10mV Voltage

Current OVP Voltage

Current Voltage

Current Voltage 10mVReadback

Current 1mA(2mA rating current >3.0A) Voltage

Current

10%~90% 90%~10% Voltage

Current Voltage Current

0~32V×10~20V×1 0~3A×10~5A×1 0~33V×10~21V×1

≦3mV(≦5mV rating current>3.0A) ≦3mA(≦5mA rating current>3.0A) ≦3mV ≦3mA

10mV

≦0.05%+20mV ≦0.1%+5mA(+10mA rating cu rrent > 3.0A) ≦0.05%+20mV

Ripple≦1mVrms/3mVp-p Noise≦2mVrms/30mVp-p

≦3mArms (≦5mArms rating current>3.0A) ≦100ppm+3mV

≦100ppm+3mA

≦0.05%+10mV ≦0.1%+5mA(10mA rating current >3.0A)

≦100ms ≦100ms (≧10% rating load) ≦100ppm+10mV

≦100ppm+5mA ≦100ppm+10mV

≦150ppm+10mA

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

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Interface RS232 (GPIB interface option) Power Source

Power Consumption Mechanical Spec.

Operation Environmental

Storage Temperature & Humidity

Accessories

AC100V, 120V, 220V±10%, 230V +10%/-6% 50/60Hz PSS-2005: 215W

PSS-3203: 190W Dimensions

Weights 4.8 kg Indoor use

Altitude up to 2000 m Ambient temperature : To satisfy specifications : 10℃ to 35℃ ( 50° F to 95°F )

Maximum operati ng ranges: 0℃ to 40℃( 32°F to 104°F ) Relative humidity: 85% RH(max.) non condensing Installation Category: II

Pollution degree: 2

-10° to 70℃, 70%RH (maximum)

Power cord….............……….. × 1

Instruction manual……………..× 1

Programmer manual................. × 1

Test Lead……….………………× 1

110(W)×140(H)×320(D) mm.

USER MANUAL

3.PRECAUTIONS BEFORE OPERATION

3-1.Unpacking the Instrument

The product has been fully inspected and tested before shipping from the factory. Upon receiving the instrument, please unpack and inspect it to check if there is any damage caused during transportation. If any sign of damage is found, notify the bearer and/or the dealer immediately.

3-2.Checking the Line Voltage

The product can be applie d by any kind of line vo ltages shown in the table below. Before connecting the power plug to an AC line outlet, make sure the voltage selector of the rear panel is set to the correct position corresponding to the line voltage. It might be damaged the instrument by connecting to the wrong AC line voltage.

WARNING. To avoid electrical shock the power cord protective grounding conductor must be connected to ground.

AVERISS: Pour éviter les chocs électriques, le fil de terre du cordon secteur doit impérativement être relié à la terre.

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When line voltages are changed, replace the required fuses shown as below:

Model

PSS-3203 PSS-2005

Line

voltage

100V 120V

Range Fuse

90-110V

108-132V

T3A

250V

Line

voltage

220V 230V

Range Fuse

198-242V 216-250V

T1.6A

250V

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

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3-3.Environment

The normal ambient temperature range of this instrument is from 0° to 40°C (32° to 104°F). To operate the instrument exceeding this specific temperature range may cause damage to the circuits of instrument. Do not use the instrument in a place where strong ma gnetic or electric field exists as it may disturb the measurement.

USER MANUAL

4. PANEL INTRODUCTION

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Figure 4-1 Front Panel

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

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Figure 4-2 Rear Panel

USER MANUAL

1. Power Switch Connect the AC power, then press power switch.

2. Display Indicate the setting of voltage/current value, output

voltage/current value and the status of setting and output.

3. +Output Terminal Positive output terminal.

4. -Output Terminal Neg ative output ter minal.

5. GND Terminal Connect the ground terminal to chassis.

6. Rotary Encoder Wheel knob.

7. V Set/I Set

(ENTER)

The key for switch over output voltage and output current setting. ENTER: The knob for value input or setting

confirmation.

8. F/C The knob for switching over coarse and fine

adjustment.

9. MENU The category of function setting (Output, OVP,

OCP, Contrast, Buzzer, Interface.) PS. After switching to the picture of function setting category, if there is no further setting action within 4 to 5 seconds, the system will return to previous setting picture or output display picture.

10. LOCAL Clear REMOTE control mode, and replace with

panel control. PS. Get into calibration mode by pressing the knob

more than 5 seconds uninterruptedly,

11. Output Turn on or off output by pressing the knob.

12. AC Power Socket AC power input ter minal.

13. AC Select Switch Switch Voltage to 100V, 120V, 220V or 230V,

50/60Hz.

14. Cooling Fan A cooling fan. 15 Interface GPIB or RS-232C communication interface.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

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5. OPERATION METHOD

5-1. Output Voltage/Current Setting

At first, ensure that the window now is at the Output Voltage/ Current setting or the output value display.

--Output Voltage Setting:

Press [Vset/Iset] to set the cursor to the position for voltage input, and modify the setting value with wheel knob. Right now, can use [F/C] to switch over the input of 1V step or 10mV step.

Example: If want to set the voltage as 12.34V, first using the [F/C] knob to switch the cursor to 10mV step and adjust the value to 34, then switch the cursor to 1V step and adjust the value to 12 to complete the modification.

USER MANUAL

Example:

If want to set the current as 1.234A, first using the [F/C] knob to switch the cursor to 1mA step and adjust the value to 34, then switch the cursor to 100mA step and adjust the value to 12 to complete the modification.

Note: 1. When the load current through output terminal exceeds

the setting value, the instrument is operated in the C.C. mode, if not exc eeds the setting value , the instrument is operated in the C.V. mode .

2. When the maximum output voltage is larger than 36V, its adjustable step is 20mV the minimum while the maximum output curren t is larger 3A, its adjustable step is 2mA the mi n imum.

5-2.Over Voltage /Current Protection Setting

--Over Voltage Protection Setting:

Set to OVP SET window by pressing [MENU], modify the setting value with the wheel knob and press [ENTER]. The modification can be done by using the [F/C] knob to switch over the input of 1V step or 10mV step.

PS. If the output is on now, the output voltage value will be varied

with the setting of the knob.

--Output Current Setting:

After pressing [Vset/Iset] to set the cursor to the position for current input, modify the setting value with wheel knob . Righ t now, use [F/C] to switch over the input of 100mA step or 1 mA step.

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--OVP Status Clear Up:

When the output voltage exceeds the setting vo ltage, the ou tput of the instrument will be off and get into OVP mode by displaying “OVP Error. Press “LOCAL” to reset” on the panel. Just press [LOCAL] to clear OVP status and back to prev ious st atus.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

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--Over Current Protection Setting:

Set to OCP SET window by pressing [MENU], Turn on/off the OCP with the wheel knob and press [ENTER]. If OCP is on, when the output current equals or exceeds the current value setting, the output of the instrument will be off and get into over current protection mode by displaying “OCP Error. Press “LOCAL” to reset” on the display. Just press [LOCAL] to clear OCP status and back to previous status.

5-3. The Display Contrast Setting

Set to Contrast Set window by pressing [MENU], modify its setting value with the wheel knob and press [ENTER].

5-4. The Buzzer Setting

Set to Buzzer Set window by pressing [MENU], turn on or off the buzzer with the wheel knob, then press [ENTER].

5-5.GPIB/RS232 Interface Setting

Set to Interface window by pressing [MENU]. If the GPIB is displayed, the Address value window will be appeared, if the RS-232 is displayed, the Baud Rate window will be appeared, then using the wheel knob to modify the value and press [ENTER] to complete the setting. Note: The system will detect the interface used at present

automatically, and switch the detected interface over the setting interface of GPIB or RS-232.

Example:

1) If want to set the GPI B ad dress valu e to 15:

Set to interface window by pressing [MENU], and adjust the address value to 15 with the wheel knob and press [ENTER] to

USER MANUAL

complete the setting.

2) If want to set the RS-232 Baud Rate to 9600: Set to interface window by pressing [MENU], and adjust the Baud Rate value to 9600 with the wheel knob and press [ENTER] to complete the setting.

5-6. The Maximum Setting Value

MODEL

ITEM

Output Voltage 33.00V 21.00V

Output Current 3.100A 5.200A

Over-voltage 34.00V 22.00V

PSS-3203 PSS-2005

5-7.Test Lead

MODEL

ITEM

PSS-3203 PSS-2005

Current 3A

Test Lead

Current 4A-10A

Test Lead

5-8. The setting for the GPIB and RS232 Interface

If you have PSS-series programmable power supply, use the GPIB or RS-232 interface, please refer to the PSS-series Programmer Manual for more details.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

6. MAINTENANCE

WARNING

The following instructions are executed b y qualified personnel only. To avoid electrical shock, do no perform any servicing other than the operating instructions unless you are qualified to do so .

6-1.Fuse Replacement

If the fuse blows, the display will not light and the power supply will

not operate. The fuse should not normally op en unless a problem ha s

developed in the unit . Try to det ermine and correct th e cause of th e

blown fuse, then replace only with a fuse of the correct rating and

type (refer to 3-2 of page 5). The fuse is located on the rear panel

(see Fig.4-2).

WARNING. For continued fire protection. Replace fuse only with 250V fuse of the specific type and rating, and disconnect power cord before replacing fuse.

6-2. Line Voltage Conversion

The primary winding of the power transformer is tapped to permit operation from 100, 120, 220, or 230VAC, 50/60 Hz line voltage. Conversion from one line voltage to another is done by change AC selects switch. The rear panel identifies the line voltage to which the unit was factory set. To convert to a different line voltage, perform the following procedure:

USER MANUAL

(1) Make sure the power cord is unplugged. (2) Change the AC selects switch to the desired line voltage position.

(3) A change in line voltage may also require a corresponding

change of fuse value. Install the correct fuse va lue as listed on rear panel.

6-3. ADJUSTMENT AND CALIBRATION

--Preparation

(1) 30 minutes warm up before calibration. (2) Ambient temperature:23±5°C, Humidity: Under PH80%.

--Output Calibration Step s: [Step 1]

Press [LOCAL] for 4 to 5 seconds interruptedly to appear Passw ord input window (vary with different models: PSS-3203: 3203, PSS2005: 2005), input the password number with the wheel knob, and use the F/C button to shift the input position at the same time, then press [ENTER]. When the password number has been input by mistake, the system will jump out of the present mode.

[Step 2] Voltage Calibration Step

After getting into Calibration selection window, select Voltage calibration with the knob and press [ENTER].

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[Step 2.1]

Now input the voltage value (Min) measured by DMM with the knob and press [ENTER]. During the voltage value input, use the [F/C] button to switch over the input of 1V step or 10mV step.

Note: The DMM selected for the measurement have the resolution of three digits of the decimal point at least (1mV). Also the input value is to take two digits of decimal point of effective value (10mV) and run off the rest.

[Step 2.3]

Adjust VR311 and adjust the voltage value measured by DMM according to the voltage displayed in the window, then press [ENTER].

Note: The DMM selected for the measurement must have the

resolution of three digits of the decimal point at least (1mV). During the adjustment, the maximum error of the measured value is ±0.005V.

[Step 3] Current Calibration Steps

Switch the Calibration selection window to current calibration item with the knob and press [ENTER] getting into current calibration steps.

[Step 3.1]

USER MANUAL

[F/C] button to switch over the input of 100mA range (100mA/step) or 1mA range (1mA/step).

Note: The DMM selected for the measurement must have the

resolution of four digits of the decimal point at least (0.1mA). Also the input v alue is to take three digits of decimal poin t of effective value (1mA) and run off the rest.

[Step 3.2]

Now input the current valu e (Min.) measured by the DMM with the

knob and press [ENTER]. During the current value input, use the [F/C] button to switch over the input of 100mA range (100mA/step) or 1mA range (1mA/step).

Note:The DMM selected for the measurement must have the

resolution of four digits of the decimal point at least (0.1 mA). Also the input value is to take three digits of decimal point of effective value (1mA) and run off the rest.

[Step 4]

Switch the Calibration selection window to O.V.P. calibration item with the knob and press [ENTER] getting into O.V.P calibration steps.

[Step 4.1]

At present, the window will indicate the progress of OVP calibration. When the calibration is completed, it will jump out of the window.

Now input the current value (Max.) measured by the DMM with the knob and press [ENTER]. During the current value input, use the

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[Step 5]

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USER MANUAL

When above calibration steps has been confirmed correctly, switch the calibration selection window to SAVE window with the knob and press [ENTER] to complete the whole calibration procedures.

[Step 6]

If the calibration procedure is not necessary to be stored, just switch the calibration selection window to Exit window and press [ENTER] to leave the calibration procedure.

6-4. Cleaning

To clean the power supply, use a soft cloth dampened in a solution of mild detergent and water. Do not spray cleaner directly onto the instrument, since it may leak into the cabinet and cause damage. Do not use chemicals containing benzine, benzene, toluene, xylene, acetone, or similar solvents. Do not use abrasive cleaners on any portion of the instrument.

USER MANUAL

7. THE SYSTEM DIAGRAM AND DESCRIPTION

7-1. Block Diagram

INPUT

LCM

DISPLAY

RS-232 OR GPIB

INTERFACE

TRANSFORMER

AUX

RECTIFIER

AND FILTER

MICRO

CONTROL

The graph above is the sys tem diagram of PSS-SERIES, Wh ich consists of Micro Processor Unit (MPU), Digital to Analog Converter (DAC), Analog Switch Circuit, Reference Voltage Circuit, Driver Circuit,

RELAY

CONTROL

REFERENCE

D TO A

CONVERTER

ANALOG

SWITCH

AND SAMPLE

HOLD

KEYBOARD

GATE

SERIES

REGULATOR

AMPLIFIER

VOLTAGE

COMPARATOR

CURRENT

COMPARATOR

O/P

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Control Circuit, Comp arator , and et c.

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PSS-3203/2005 PROGRAMMABLE POWER SUPPLY

USER MANUAL

7-2.The Operation of th e who le cir cuit

Each output channel of PSS-serie s has a reference voltage circuit at around 2.5V output voltage which can be amplified to 2.5 (1+R314 /(R315+Vr))=2.5(1+12.4k/(7.68k+Vr)) by a non-inverter amplifier. When Vr=0~500, take its middle value to convert above formula into

6.41V, and treat this as the reference voltage of DAC AD7541. The AD7541 is a 12-bit DAC with 6.41V/4095=1.56mV/bit of the resolution.

When the instrument is in C.V. Mode, the MPU will send 3300 counts, 33.00V of output voltage, to DAC, output through an alog switch and Sample Hold circuit, the voltage now is at around -5.148V(-

1.56mVx3300=-5.148V). Then, compare this voltage with the real ou tput voltage which is retrieved by the voltage sense circuit. As the entire circuit is a close loop, therefore, the retrieved voltage value will be followed with the reference voltage of Sample Hold. Besides, the

USER MANUAL

The operation in C.C. Mode is similar to that in C.V. Mode. The MPU will send 2100 counts, 2.1A output current, to DAC, output through analog switch and Sample Hold circuit, the voltage now is at around

-3.276V (-1.56mVx2100=-3.276V). Then, compar e this voltage with the real output voltage which is retrieved by the current sense circuit. As the entire circuit is a close loop, therefore, the retrieved voltage value will be followed with the reference voltage of Sample Hold. Besides, the Comparator output terminal will output a relative voltage value to con trol the whole output circuit through a driver circuit, and generate the required output voltage. The current sense circuit for detecting the voltage value from current sense resistor is mainly composed by differential amplifier TL071. The multiple of the differential amplifier is A=-R355/R356=-22.0k/1.91k=-11.518, the voltage on the both sides of current sense resistor is -3.276/-11.518=0.285V, so the output curr ent is basis on Iout=(0.285/R374)*2=(0.285/0.3)*2=1.9A, and 2.1A making

Comparator output terminal will output a related voltage value to control the whole output circuit through a driver circuit, and generate the

required output voltage. The attenuation of the voltage sense circuit is A=R342/(R342+R335)=4.99K/(4.99k+27.0k) =0.156, and the output voltage is Vout=5.148/A=5.148/0.156=33.00V. If the output is affected by the offset of material s, can use th e Vr to mak e ad equa te adju st ment .

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multiple operand to get a real output current by using the software.

The Displayed Value of Voltage and Current

The voltage/current sense circuit retrieves a voltage value which will be sent to Comparator through Analog Switch, and joined with the output voltage of DAC in dichotomy approaching method to get the same voltage as the r ea l ou tp ut v alu e of th e in st rumen t .

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GW Instek PSS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual