GW Instek SPS-1230 User manual

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DC POWER SUPPLY
(Switching Mode)
SPS-1230/1820/3610/2415/606
USER MANUAL
GW INSTEK PART NO. 82PS-36100MI1

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ISO-9001 CERTIFIED MANUFACTURER
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 practice that could result in damage to this
product or other property.
WARNING: This equipment is not for measurements performed for CAT II, III and IV.
Measurement category I is for measurements performed on circuits not directly connected to MAINS.
Measurement category II is for measurements performed on circuits directly connected to the low voltage installation.
Measurement category III is for measurements performed in the building installation.
Measurement category IV is for measurements performed at the source of the low-voltage installation.
The following symbols may appear in this manual or on the product:
DANGER
High Voltage DANGER Hot Surface ATTENTION refer to Manual Protective Conductor Earth(ground) terminal

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Terminal

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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:
The wire which is coloured Green & Yellow must be connected to the Earth terminal mark
e
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 t
h
Letter N or coloured Blue or Black.
The wire which is coloured Brown must be connected to the terminal marked with the lette
r
or P or coloured Brown or Red.
If in doubt, consult the instructions provided with the equipment or contact the supplier.
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 ²should be protected by a 3A or 5A fuse. Larger conductors would norm
a
require 13A types, depending on the connection method used.
Any moulded mains connector that requires removal/replacement must be destroyed by re
m
of any fuse & fuse carrier and disposed of immediately, as a plug with bared wires is hazar
d
if a engaged in live socket. Any re-wiring must be carried out in accordance with the infor
m
detailed on this label.

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EC Declaration of Conformity
We
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 District Jiangsu, China.
declare, that the below mentioned products
SPS-1230, SPS-1820, SPS-3610, SPS-2415, SPS-606
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, 92/31/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:
EN 61326-1: Electrical equipment for measurement, control and laboratory use —
EMC requirements (1997+A1: 1998+A2:2001)
Conducted Emission Electrostatic Discharge EN 61000-4-2:1995+A1:1998
Radiated Emission EN 55011:1998 Class A Radiated Immunity EN 61000-4-3:1996+A1:1998
Electrical Fast Transients EN 61000-4-4:1995
Current Harmonic EN61000-3-2: 2000 Surge Immunity EN 61000-4-5:1995
Voltage Fluctuation EN61000-3-3:1995 Conducted Susceptibility EN 61000-4-6:1996
------------------ ------------------------- Power Frequency Magnetic field EN 61000-4-8:1993
------------------ ------------------------- Voltage Dip/Interruption EN 61000-4-11:1994
Low Voltage Equipment Directive 73/23/EEC & amended by 93/68/EEC
Low Voltage Directive IEC/ EN 61010-1: 2001

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CONTENTS
1. INTRODUCTION.....................................................................................................................................................................1
2. SPECIFICATION.....................................................................................................................................................................2
2-1. GENERAL ..............................................................................................................................................................................2
2-3. CONSTANT CURRENT OPERATION.........................................................................................................................................3
2-4. INDICATOR METER................................................................................................................................................................3
2-5. OVER VOLTAGE PROTECTION...............................................................................................................................................3
2-6. INSULATION ..........................................................................................................................................................................3
3. PRECAUTIONS BEFORE OPERATION .............................................................................................................................4
3.1 UNPACKING THE SWITCHING POWER SUPPLY ........................................................................................................................4
3.2 CHECKING THE LINE VOLTAGE ..............................................................................................................................................4
3.3 ENVIRONMENT .......................................................................................................................................................................5
3.4 EQUIPMENT INSTALLATION,AND OPERATION........................................................................................................................5
4. THEORY OF OPERATION (SEE FIGURE 4-1)..................................................................................................................6
5. PANEL CONTROLS AND INDICATORS............................................................................................................................8
5-1. FRONT PANEL........................................................................................................................................................................9
5-2. REAR PANEL..........................................................................................................................................................................9
6. OPERATION INSTRUCTIONS ...........................................................................................................................................12
6-1. PRECAUTION.......................................................................................................................................................................12
6-2. SETTING CURRENT LIMIT....................................................................................................................................................15
6-3. CONSTANT VOLTAGE /CONSTANT CURRENT CROSSOVER CHARACTERISTIC .....................................................................15
6-4. OPERATION MODE:VOLTAGE OPERATION MODE ...............................................................................................................15
6-5. REMOTE ERROR SENSING ...................................................................................................................................................16
6-6. REMOTE CONTROL..............................................................................................................................................................18
6-7. OVP SETTING .....................................................................................................................................................................18
7. MAINTENANCE....................................................................................................................................................................19
7-1. FUSE REPLACEMENT...........................................................................................................................................................19
7-2. LINE VOLTAGE CONVERSION ..............................................................................................................................................19
7-3. INTERNAL ADJUSTMENTS ....................................................................................................................................................20
7-4 CLEANING............................................................................................................................................................................22

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1. INTRODUCTION
The series of switching power supplies for measuring instrument have ruled out the inconvenience of big
volume and heavyweight of a traditional power supply possess.
The output voltage and current is controlled by two variable resistors with coarse and fine regulation for more
handy and precise adjustment.
Features:
zWith more extensive range of input voltage at 97V~133V (for 115V) and 195V~265V (for 230V).
zWith high frequency operation can reduce the size of power transformer.
zWith small size, light weight and high density power.
zEntire efficiency rate higher up to 70%.
zAuto control the voltage and current mode.
zZero adjustment for the output of voltage and current.

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2. SPECIFICATION
2-1. General
Main supply : 115V/230V±15% 50/60Hz (Switch selectable).
Rating, dimension and weight : See Table 2-1.
Table 2-1 MAX. RATING INPUT RATING FUSE STYLE & RATING WEIGHT
Model Voltage Current Watts VA 115V 230V kg
SPS-1230 12V 30A
SPS-1820 18V 20A
SPS-2415 24V 15A
SPS-3610 36V 10A
SPS-606 60V 6A
500 900 T 10A 250V T 6.3A 250V 3.3
Dimensions：128(W) ×145(H) ×285(D) mm.
WARNING: Voltage over 60V DC is a lethal shock hazard to the user. Be careful when
connecting power supplies in series to achieve voltage higher than 60V DC totally or 60V
DC between any connection and earth ground.
Operation Environment : Indoor use,
Altitude up to 2000m,
Installation Category II,
Pollution degree 2.
Operation Temperature &Humidity : 0℃to 40℃, <80%.
Storage Temperature & Humidity : -10℃to 70℃, <70%.
Accessories : Test Lead (current < 4A)…………………………………………… × 1
Operation Manual..…………………………………………………………. × 1

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2-2. Constant Voltage Operation
(1) Output Voltage ranges from 0 to rating voltage with continuous adjustment.
(2) Voltage regulation
line regulation≦5mV.
load regulation≦5mV.
(3) Recovery time≦500μs(50% Load change, minimum load 0.5A).
(4) Ripple & Noise≦5mVrms, 100mVp-p (tested by 20MHz oscilloscope.)
(5) Temperature coefficient≦100ppm/℃.
2-3. Constant Current Operation
(1) Output current ranges from 0 to rating current with continuous adjustment.
(2) Current regulation
line regulation≦3mA.
load regulation≦3mA.
SPS-606 SPS-3610 SPS-2415 SPS-1820 SPS-1230
(3) Ripple & Noise
≦3mArms ≦5mArms ≦10mArms ≦10mArms ≦30mArms
2-4. Indicator Meter
1)Voltage:
Display : 3 1/2 Digits 0.39” Green LED display.
Accuracy : ±(0.5% of rdg + 2 digits).
2)Current:
Display : 3 1/2 Digits 0.39” Red LED display.
Accuracy : ±(0.5% of rdg + 2 digits).
2-5. Over Voltage Protection
(1) Over Voltage Protection ranges from 5% rating to rating +5.5%.
(2) OVP Accuracy ±(Vset 1%+0.6V)
2-6. Insulation
Between Chassis and Output Terminal : ≧20MΩ(DC500V).
Between Chassis and AC Cord : ≧30MΩ(DC500V).

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3. PRECAUTIONS BEFORE OPERATION
3.1 Unpacking the Switching Power Supply
The instrument 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 damages 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 instrument can be used with line voltages 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 and the proper fuse
installed corresponding to the line voltage. The unit may be damaged if connected to the wrong AC line voltage.
WARNING: To avoid electrical shock the power cord protective grounding conductor must be
connected to ground.
When line voltages are changed, replace the required fuses shown below.
Line voltage Range Fuse Line voltage Range Fuse
115V 97-133V T 10A 250V 230V 195-250V T 6.3A 250V
WARNING: To avoid personal injury, disconnect the power cord before removing the fuse
holder.

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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). Operation of the
instrument above this temperature range may cause damage to the circuits.
Do not use the instrument in a place where strong magnetic or electric field exists as it may disturb the
measurement.
3.4 Equipment Installation, and Operation
Ensure there is proper ventilation for the vents in the SPS power supplies case. If this equipment is used in a
manner not according to the specification, the protection provided by the equipment may be impaired.
WARNING: This is a Class A product. In a domestic environment this product may cause
radio interference in which case the user may be required to take adequate measures.
WARNING: This equipment is not for measurements performed for CAT II, III and IV.

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4. THEORY OF OPERATION (See Figure 4-1)
zBlock Configuration of SPS- System
The SPS-Series comprise a Bridge rectifier, a Pulse Width Modulation, a Driver Circuit, a Driver Transformer,
a Rectifier Circuit, a Voltage Control Circuit, a Current Shunt, an Output Filter, a Voltage/Current Adjusting
Circuit, a Buffer Circuit, an Error Amplifier, an Opto-Isolator, and an Auxiliary Switching Supply and etc.
zComponent List for each circuit configuration
Bridge Rectifier: BD101.
Pulse Width Modulation: U102.
Driver Circuit: T104, Q105~Q108.
Driver Transformer: T301.
Rectifier Circuit: D301,D3011.
Voltage Control Circuit: Q303.
Current Shunt: R341.
Output Filter: Common Choke L302, C325.
Voltage/Current Adjusting Circuit: U302.
Buffer Circuit: U302, Q301.
Error Amplifier: U301, U303.
Opto-isolator: U304.
Auxiliary Switching Supply: U201, U202, T201.
OVP: U401, U402
Remote Control: RL401, D402

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zDescription of Circuit Theory
1) +10V Voltage reference circuit：
Start up the circuits of R306 and D302 to ensure the output voltage of OPA U301, PIN 1 is in positive status when power
is on. At this moment, the output voltage of PIN 1 will pass through R307 to maintain the voltage of both ends of
ZENER DIODE ZD301(6.2V) to 6.2V. As OPA has the character of false short circuit, so U301 PIN3=6.2V, refer to the
following formula:
Therefore, the OPA’s output voltage can be changed by adjusting the VR301 as shown in the following formula:
Vref=10V→VR301=1.14kΩ
2) Voltage Adjusting Circuit
The R311, and R313 are voltage feedback attenuating resistors while R312 is to control the output of Reference voltage.
Please refer to the following formula:
If Vref=10V R311=52.3kΩR313=20kΩ
And the R316, R317, C313, C314, and C315 are compensated circuits for voltage frequency.
3) CurrentAdjusting Circuit:
The U302 is an Error Amplifier with the gain at:
For example: SPS-1820, Io=20A，R341=10mΩ
Vpin12=Io×R341×A=20×0.01×28.01=5.602V

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zFigure 4-1: Block Diagram
5. PANEL CONTROLS AND INDICATORS

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5-1. Front panel
(1) CV Indicator Lights when the power is on and in constant voltage operation.
(2) CC Indicator Lights when in constant current operation.
(3) Voltage coarse For the coarse adjustment of the output voltage.
(4) Voltage fine For the fine adjustment of the output voltage.
(5) Current coarse For the coarse adjustment of the output current.
(6) Current fine For the fine adjustment of the output current.
(7) “+” output terminal Positive polarity (Red) (MAX. 3A output only).
(8) “GND” terminal Earth and chassis ground (Green).
(9) “–“output terminal Negative polarity (Black) (MAX. 3A output only).
(10) Meter Indicates the output voltage.
(11) Meter Indicates the output current.
(12) Power control On/Off switch.
(13) Current HI/LO control Current indicates HI/LO range selection.
HI range: Output current range is from 0 to rating current.
LO range: Output current range is from 0 to half-rating current.
5-2. Rear panel
(14) Fuse holder
(15) Power socket.
(16) AC selects switch With 115V or 230V voltage and current ranges selection (Refer to the
diagrammatic instruction to prevent mis-operating).
(17) Fan Cooling fan.
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
S+ sense terminal
S– sense terminal
+ output terminal
– output terminal
Ground terminal
Remote Control
OVP ADJ
M+ sense terminal
n
M- sense terminal
A positive input voltage remote sense terminal.
A negative input voltage remote sense terminal.
Screw type + output terminal.
Screw type – output terminal.
Screw type ground terminal (connected to case chassis).
Short or open the remote control terminal for output on or off.
Adjust trimmer VR401 to set the OVP value.
A positive output voltage monitor terminal.
A negative output voltage monitor terminal.
Remark: As the front panel has 3A current limit and no remote sense terminal, it is recommended to use rear
output terminal for most of the applications.

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Fig. 5-1 Front Panel

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Fig. 5-2 Rear Panel

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6. OPERATION INSTRUCTIONS
6-1. Precaution
(1) AC input
AC input should be within the range of line voltage±15% 50/60Hz.
WARNING: To avoid electrical shock, the power cord protective grounding conductor must be
connected to ground.
(2) Installation
The machine itself is a heating source , please don't pile up the machine while operation. Keep the machine
from other heating source at least for 10cm to assure a sufficient space for radiation in order to extend the life of
the machine. The heat sink located at rear of the power supply must have sufficient space for radiation.
CAUTION: To prevent the instrument from damage, ensure the working environment is under
40℃of temperature. If exceeding 40℃, please refer to the drawing shown as (3) of next page.

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(3) Output Current/Temperature Cure Line Chart:
100%
Output
Current
50%
(%)
20%
0 10 20 30 40 50 60
Environment Temperature (℃)

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(4) Output Test lead Selection:
The Selection of Output Test Lead and Feedback Test Lead:
For safety assurance, please select the adequate output test lead according to the following list:
ConductorUL
(CSA)
Model Wire No.
AWG Component pc/mm Cross Section Area
(mm)2Outer
Diameter
mm
Maximum
Conductive
Resistor
Ω/km
Permissible
Current
A(amp)
24 11/0.16 0.22 0.64 88.6 7.64
22 17/0.16 0.34 0.78 62.5 10.0
20 21/0.18 0.53 0.95 39.5 13.1
18 34/0.18 0.87 1.21 24.4 17.2
16 26/0.254 1.32 1.53 15.6 22.6
14 41/0.254 2.08 2.03 9.90 30.4
12 65/0.254 3.29 2.35 6.24 40.6
1015
TEW
(Twisted Wire)
10 65/0.32 5.23 3.00 3.90 55.3
Remark:
1. The ambient temperature of “Permissible Current” is at 40℃, the withstanding temperature of conductor is at 105
℃according to the condition of the distributed single wire.
2. The permissible current listed as above is suggested to be used under 70%.
3. If the feedback test leads are in need, the level above UL(CSA) AWG24, 22, 20… can be accepted. Besides,
when the load is a capacitive load, please use the twine wire by twisting (+)output test lead with (S+) feedback
test lead. Same way used on (-) output test lead and (S-) feedback test lead.
4. When the current value exceeds above suggestive list, can select more wires used in parallel according to above
list.