GW Instek GPS-1830 User manual

DC POWER SUPPLY
Tenma Models72-2005 and 72-6535
(Analog and Digital Series)
User Manual

CONTENTS
SECTION PAGE
1 . INTRODUCTION ............................................................................................................................. 1
...................................................................................................................... 2 . SPECIFICATIONS 2
2- General ............................................................................................................................ 2
2 - 2 ConstantVoltageOperation .................................................................................................. 3
2 - 3 ConstantCurrent Operation ................................................................................................... 3
....................................................................................................................
2 - 4 IndicatorMeter 3
2 - 5 Insulation ......................................................................................................................... 4
...........................................................................................................
3 . THEORY OF OPERATION
4 . PANEL CONTROLS ANDINDICATORS
...........................................................................................
4 - 1 Front Panel ..........................................................................................................................
4 - 2 Rear Panel ..........................................................................................................................
5 OPERATIONINSTRUCTIONS ......................................................................................................
5 - 1 Precaution .........................................................................................................................
............................................................................................................
5 - 2 SettingCurrent Limit
5 - 3 Constant Voltage/Constant Current Characteristic ......................................................................
...................................................................................................................
5 - 4 OperationMode
.............................................................................................................................
6 MAINTANCE
6 - 1 Fuse Replacement .............................................................................................................
6 - 2 Line Voltage Conversion .......................................................................................................
6 - 3 Adjustments .........................................................................................................................
............................................................................................................................. 6 - 4 Cleaning
1 . INTRODUCTION
The regulated DC power supply have been designedto provide the most often requiredin the laboratory.schools and
production Lines
.
The output voltage is continuously adjustablebetween 0 to rating voltagein one range by means of a coarseand fine
potentiometer
. the load current may have any value from 0 rating current and adjustedby means of a coarse and fine potentiometer .
Both output can accurately readsonvoltmeter and ammeter.
Both stabilityand ripple are extremely good to meet the requirementsof moderncircuit design . The unit can be used as either
constantvoltage or current source
.'The various operation mode are describedin more detail in the OperationInstructionsection .
For applicationswhen output'greater than V or A is need. the unit can be connectedup in series or parallel.
For applicati~nin audio production lines. the continuous or dynamic load internal selectable
.

2. SPECIFICATIONS
2 - 1 General
Main supply 100V/120Vl220V/240V *lo% 50160 Hz (Switch selectable)
Rating, dimension and weight see Table
2 - 1.
Table 2-1
MODEL
GPS - 1830
GPS-1830D
GPS - 1850
GPS-1850D
GPS - 3030
GPS
- 3030D
GPS
- 6010
Weight
Kg
4.0
4.0
5.5
5.5
5.0
5.0
4.0
FUSE
Type and Rating
WARNING. Voltages more than 60V DC are a lethal shock hazard to the user.
Be careful when connecting power supplies in series to achieve voltages higher
than
60V DC total or 60V DC between any connection and earth ground.
Dimensions
: 128 (W) X 145 (H) X 285 (D) rnrn
100v1120v
1
T 2A 250V
T 2A 250V
T 2.5A 250V
T 2.5A 250V
T 2.5A 250V
T 2.5A 250V
T 2A 250V
Operation mode Single or Tracking (Series or Parallel) operation (two units).
Max. Rating
22OVl24OV
T 1A 250V
T 1A 250V
T 1.25A 250V
T 1.25A 250V
T 1.25A 250V
T 1.25A 250V
T 1A 250V
Operation Environment : Indoor use
Altitude up to
2000 m
Installation Category
IT
Pollution degree 2
Input Rating
Volts
(V)
18
18
18
18
30
30
60
Watts
120
120
190
190
160
160
120
Amps (A)
3
3
5
5
3
3
1
VA
150
150
230
230
200
200
150

Operation Temperature &
O"C to 40°C, <80%
Humidity
Storage Temperature
& - 10°C to 70"C, <70%
Humidity
Accessories
.......................................................................................
Test Lead (current < 4A)
1
(4AScurrent SIOA)
..................................................................................................
OperationManual 1
2 - 2 Constant Voltage Operation
(1) Output voltage ranges 0 to rating voltage continuously adjustable.
(2) Voltage regulation
line regulation<O.O1%+3mV.
load regulation~O.O1%+3mV(ratingcurrent~3A).
load regulation~O.O1%+5mV(rating current>3A).
(3) Recovery time<IOOps (50% Load change, minimum load 0.5A)
(4) Ripple & Noise ~0.5mVrms(5Hz-1MHz) (ratingcurrent~3A).
Ripple & Noise <l.OmVrms (5Hz-1 MHz) (ratingcurrent>3A).
(5) Temperature coefficient~300PPMPC.
2 - 3 Constant Current Operation
(1) Output current range 0 to rating current continuously adjustable.
(2) Current regulation
line regulation60,2%+3mA.
load regulation<0.2%+3mA.
(3) Ripple & NoiseS3mArms.
24 Indicator Meter
(1) Digital Type
Display: 3 112 Digits 0.5" Red
LED DISPLAY (Voltage and current switchable).
Accuracy: +(0.5%
of rdg + 2 digits).

Voltage range: 19.99V of full scale (rating voltage618V).
199.9V of full scale (rating voltage>20V).
Current range: 1.999A of full scale (rating current<2A).
19.99A of full scale (rating currenta2A).
(2) Analog Type
Meter: Voltmeter and Ammeter each one.
Class: 2.5
Dimensions: 50x50 m/m.
2 - 5 Insulation
Between chassis and output terminal.
20MIR or above (DC500V).
Between chassis and AC cord.
30MR or above (DC500V).
3. THEORY OF OPERATION
The power supply consistsof an AC inputcircuitand transformer, abias supply consistingof arectifier and filter and reference
voltagesource, a main regulator circuit consisting ofthemain rectifier and filter, aseries regulator, acurrent comparator, avoltage
comparator, a reference voltage amplifier, a remote control and a relay control circuit.
The circuit element are several of integrated circuit (U101, U102, U103, U104, U105, U106).
The circuit arrangement is shown in block diagram from Fig. 1.
The circuit is discussed with reference to the block diagram Function Description.
Single phase input power is applied to transformer through the input circuit.
Auxiliary rectifier D1021-Dl024provides abias voltage filtered by capacitor C103, C104 for the preregulatorU101, Q105, Q106,
that provides a regulator voltage for element of action.
Themain rectifier, afull wavebridgerectifier, provides thepower whichisfiltered bycapacitorC101 andthen regulated via
a series regulator and deliver to the output.
U105 acted as acurrent limiter. Whencurrent isoverpredominante rating, itacted and decreasedthecurrentU102 provides
a reference voltagefor U103A, U1038, U103 is
a invertoramplifier, U105 is acurrentcomparator. Both via OR gate and driveramplifier
to series control 0101, Q102.
The relay control circuit provides limited power dissipation is series regulator.

AC INPUT
I
Fig. 1 Block Diagram
-5-
REFERENCE
VOLTAGE
SOURCE
U102
AUXILIARY
RECTIFIER AND
FILTER Dl021
Dl024 ,UlOl
9105.91 06
REMOTE CONTROL
TI01,S105
TRANsFoRMER
TSl01
,
V >
R E F E R E N C E
CURRENT
SER @- U103B
MAIN
RECTIFIER
& FILTER Dl01
-01 014,ClOl
0103,4104
*OR"GATE &
DRIVER AMP Qll2,Qll3
MASTER O/P
-
R101
I<
COMPARATOR RL101,RL102
RELAY
CONTROL
.Q109,0110,Q111
Dl08,0109
PAR
C
A
o/p
>
CURRENT
-+
COMPARATOR
U105
I
SERIES
REGULATOR
9101,9102
4 b
CURRENT
REFERENCE VOLTAGE
AMPLIFIER
U103A
-
COMPARATOR
U104 SENSER
AMPLIFIER
U106

4. PANEL CONTROLS AND INDICATORS
4
- 1 Front panel
@ CV indicator
@ CC indicator
@ Voltage coarse
@ Voltage fine
) Current coarse
@ Current fine
"+" output terminal
\l.,
@ " GND terminal
@ "-" output terminal
@ meter
3 meter
@ AN selects switch
Power control
@ Current HIILOcontrol
lights when the power turn on and constant voltage operation.
lights when this unit in constant current operation.
for thecoarse adjustment of the output voltage.
for thefine adjustment ofthe output voltage.
for thecoarse adjustment of the output current.
for thefine adjustment of the output current.
positive polarity (Red).
earth and chassis ground (Green).
negative polarity (Black).
indicates the output voltage (Analog type).
indicates the output voltage or current (Digital type).
indicates the output current (Analog type).
selects the meter indicates ofthe output voltage or current (Digital type).
onloff switch.
current indicates HI/LO range SELECTS.
4 - 2 Rear panel
Fuse holder
@ Power cord
AC selects switch With switch selectstheline voltage atthehighend(Rightposition)oftherange
120V or 240V and at the low end (leftposition) of the range
100V or 220V.
@ AC selects switch SelectsthelineVoltageisinthe 100V-120Vrange (leftposition)or isinthe 220V-240Vrange
(Right position).
@ Master - Slave Switch Selectsfor Master (internalcontrol) or Slave (externalremotecontrol)trackingoperation.
@ Input - Output connector With
@ Master-Slaveswitchselects, permit fromtheMaster unit (SER. or PAR.) output
connected to Slave unit
(SER. or PAR.) inputs.

I
LABORATORY DC POWER SUPPLY
/ F I N E COARSE NAMPS~( FINE COARSE
/ rON 1OFF
I GND +
I / -
Fig. 4 - 1 Front Panel (Digital Type)

I
FIG. 4 - 3 REAR PANEL

5. OPERATION INSTRUCTIONS
5 - 1 Precaution
(1
) AC input
A
AC input should be within the range of line voltage + 10% 50160Hz
/I\ WARNING. To avoid electrical shock, the power cord protective grounding conductor must be connected to ground.
(2) Installation
Avoid using the supply
in a place where ambient temperature exceeds 40°C. The heat sink located at the rear of
the supply must have sufficient air space for radiation.
/i\cAuTIoN. To avoid damaging the power supply, don't use it in a place where ambient temperature exceeds 40°C.
(3) Output voltage overshoot
Voltage between output terminals never exceeds the present value when the power is turned on or off
5 - 2 Setting Current Limit
(1) Determine the maximum safe current for the device to be powered.
(2) Temporarily short the
(+) and (-1 terminals of the power supply together with a test lead.
(3) Rotate the COARSE VOLTAGE control away from zero sufficiently for the CC indicator to light.
(4) Adjust the CURRENT control for the desired current limit. Read the current value on the Ammeter.
(5) The current limit (overload protection) has now been preset. Do not change the CURRENT control setting after
this step.
(6) Remove the short between the (+) and (-1 terminals and hook up for constant voltage operation.
5 - 3 Constant VoltageIConstant Current Characteristic
The working characteristic of this series Power Supplies is called
a constant voltage/constant current automatic
crossover type. This permits continuous transition from constant current to constant voltage modes in response to
the load change. The intersection of constant voltage and constant current modes is called the crossover point. Fig.
5 - 1 shows the relationship between this crossover point and the load.
For example, if the load is such that the power supply is operating
in the constant voltage mode, a regulated
output voltage is provided. The output voltage remains constant as the load increases, up until the point where the
preset current limit is reached. At that point, the output current becomes constant and the output voltage drops is
proportion to further increases
in load. The crossover point is indicated by the front panel LED indicators. The cross -
over point is reached when the CV indicator goes off and the CC indicator comes on.

Vo Max
t
- Crossover Point
Output
Voltage
Output Current
Fig. 5 - 1 Constant VoltageIConstant Current Characteristic.
Siinilarly,crossoverfrom theconstantcurrent totheconstantvoltagemode automatically occursfrom adecreaseinload.
A goodexample of thiswouldbe seen whencharging a12 - volt battery.Initially, the opencircuitvoltageof thepower supply may
bepreset for
13.8 volts. A lowbattery willplaceaheavyloadon thesupply and it willoperateintheconstantcurrentmode, which
may be adjustedfor a1 amp charging rate. As the battery becomes charged, anditsvoltageapproaches
13.8 volts, itsload decreases
tothe point wnere
it nolongerdemandsthefull 1 ampcharging rate. Thisisthecrossoverpoint wherethe powersupplygoesinto
the constant voltage mode.

5 - 4 Operation Mode
$
(1) Single Operation
Use the supply as it is for single operation.
A. Set Power switch to " OFF " position.
B. Make sure that line voltage is correct for the input power voltage.
C. Plug power cord into the power outlet.
D. Set Power switch to " ON " position.
E. Adjust
" Voltage " and " Current " control to the desired output voltage and current.
F. Connect the external load to the output binding posts. Make sure both
"+" and "-" terminals are connect correctly.
(2)
Series Operation ( or~lyapplied to the same models )
Two power supplies can be connected in series to provide higher voltage and rating current output. See Fig. 5 - 2 for the
connection scheme.
A. Set power switch to
" OFF " position.
B. Set the " MASTER " power supply INT - SLAVE switch to " INT " position and set the " SLAVE " power supply INT - SLAVE
switch to
" SER - SLAVE " position.
C. From the " MASTER " power supply " SER " output terminal to " SLAVE " power supply " SER " input.
D. Set power switch to " ON " position.
A
WARNING. Voltage more than 60V DC are a lethal shock hazard to the user. Be careful when connecting
power supplies in series to achieve voltage higher than
60V DC total or 60V DC between any connection and
earth ground.

Fig. 5 - 2 Coilllectillg Two Power Supplies in Series
I__________________-------------------------------
I
I
I
REAR PANEL
I
I
I
I
I
I
I SER. 1 / I'
I
I
I
I
I
I
I
I (>C>(>o POWER I I +
I I
I @
II b/p -/
I I
SUPPL,Y
I
I
-
I
I
1
111
I @
I
I
I
I I
I I
I
(MASTER)
I
I
-J SLAVE
I
1 INT
I
I
L----------------------------------__-------------
LOAD
I--------_-____-----------------------------------
CONNECTED
I
I/P
I
I I
1 I
I
I
1
0000
+
I POWER I @
I
I
I
SUPPLY
-
I
I
I I
I
II I I @
I 1
I 1
I
(SLAVE)
I
I I
I
I

E. Set theSLAVE VOLTAGE and CURRENT control to maximum output.
F. Whenconnectedinseries, from themaster VOLTAGE controls of each powersupplyexercisecontrolover 0 torating
range. Addthetwovoltmeter readingstogether todeterminethetotaloutputvoltage, or an external voltmeter may
1"
be connect across the load.
G. Loadcurrent may bemonitored fromeither supply; thereading will beidentical sincetheyareconnectedinseries.
Also, sincethesuppliesareconnectedinseries,
it isonlynecessary toset thecurrent limitof themaster power supply;
theslave would set for maximum.
(3) Parallel Operation
Twopower suppliesmay be connectedinparallelto providerating voltageand highercurrentoutput. See Fig. 5
- 3 for the
connection scheme.
A. Set power switch to " OFF
1
' position.
8. Setthe " Master " powersupplyINT - SLAVEswitchto " INT " positionandset the " SLAVEpowersupplyINT - SLAVEswitch
to
" PAR - SLAVE position.
C. From the " MASTER " power supply " PAR " outputterminal connectedto " SLAVE power supply " PAR " input.
D. Whenconnectedinparallelthe VOLTAGE controlsof eachpower supplyexercisecontrolover a 0 toratingrange. Add
thetwoammeter readingstogether todeterminethetotaloutput currentor an externalammetermay be connectedseriesthe
load.
1
E. The output voltagemay be monitoredfrom either supply; the readings willbeidenticalsince they are connected inparallel.
I
Also, sincethesuppliesareconnectedinparallel, it isonlynecessarytosetthecurrentlimitof themasterpower supply;
I
the slave wouldset for maximum.
i
F. Set power switch to " ON " position.
G. Set theSLAVE VOLTAGE and CURRENT control tomaximum output.
H. Set theMASTER output voltage lower than 0.2-0.5V of SLAVE output voltage, this point is very important.

I REAR PANEL I
I )INTJ SLAVE
L-----7 CONNECTED I I
POWER
I + @
I I
SUPPLY
INTJ SLAVE
L -------- J
Fig. 5 - 3 Connecting Two Power Supplies in Parallel.

(4) Remote control of output voltage
Theoutput voltageof the powersupplycan be remote
- controlledwithan externalvoltage, theconnectionschemeas
follow, See Fig. 5-4.
Fig. 5 - 4
REAR PANEL
---
+
REMOTE CONTROL VOLTAGE SOURCE
r-
POWER
SUPPLY
IINT~SUVE I
A. Set the power supply INT - SLAVE switch to " SER - SLAVE " position.
B. The "+" lineof controlvoltagesourceis connectedtothe " SERinputterminalandthe "-" lineof controlvoltagesource
is connected to the power supply output
"+" terminal.
C. The output voltageEo calculate as followsformula:
Eo = lLLEL
10
Eo: Output voltage of the power supply.
Er: Rated voltage of the power supply.
Ec: Remote control voltage.
OeEceapprox. 10V
D. For theremotevoltagesource Ec, use adivicewhichprovides'a stable, low noisevoltagesource (aGOOD WILLGPR,
GPC series power supply or an equivalent device).

(5) Remote control of outputcurrent
Theoutputcurrent of thepowersupplycan beremote - controlledwithan externalvoltage, theconnection schemeas follow,
See
Fig. '5 - 5.
Fig. 5 - 5
REAR PANEL REMOTE CONTROL VOLTAGE SOURCE
POWER
A. Set the power supply INT - SLAVE switch to " PAR - SLAVE " position.
B. The "-" lineof controlvoltagesourceisconnectedtothe " PAR
n
inputterminalandthe "+" lineof controlvoltagesource
is connected to the power supply output " + " terminal.
C. The output current lo calculate as follows formula:
lo
= hLEL
10
lo: Output current of the power supply.
Ir: Rated current of the power supply.
Ec: Remote control voltage.
OsEcGapprox. 10V
D. For theremotecontrolvoltagesourceEc, use adevicewhichprovidesastable, lownoisevoltagesource (a GOOD WILL
GPR, GPC series power supply or an equivalent device).

6. MAINTENANCE
The following instructions.arefor use by qualifiedpersonnel only. To avoidelectricalshock, do notperformany servicing
other than contained in the operating instructionsunless you are qualifiedto do so.
6-1 Fuse Replacement
Ifthefuseblows, theCV or CC indicatorswillnot lightandthepowersupply willnotoperate. Thefuseshouldnot normally
openunlessaproblemhas developedintheunit.Trytodetermineandcorrectthecauseof theblownfuse, thenreplaceonly with
a fuse of the correct rating and type.
The fuse is located on the rear panel (seeFig.
4-3).
WARNING. For continued fire protection. Replace fuse only with 250V fuse of the specified type and rating.
And disconnect the power cord before replacing fuse.
6 - 2 Line Voltage Conversion
The primarywinding of thepowertransformeristappedtopermit operationfrom100,120,220, or 240 VAC, 50160 Hz line
voltage. Conversion from one line voltageto another is done by change AC selects switch as shown in Fig.
4 - 3.
The rear - panelidentifiesthe linevoltagetowhichtheunitwas factorysetted. To convert toadifferentlinevoltage, perform
the following procedure:
(1) Make sure the power cord is unplugged.
(2) Change the AC selects switch to the desired line voltage position.
(3) A changeinlinevoltagemay also require a correspondingchangeof fuse value. Installthecorrectfusevalueas listedonrear
panel.
6 - 3 Adjustments
Thisunit was accurately adjustedatthe factorybeforeshipment. Readjustmentisrecommendedonlyifrepairshavebeen
made in
a circuit affecting adjustmentaccuracy, or if you have a reason tobelieve the unitisout of adjustment. However, adjustments
should be attempted onlyif amultimeterwith an accuracy of +0.1% dcv or betteris available
(GOOD WILLModel GDM-8035G
1
or,equivaIent). 1

If readjustment is required, use the following procedure. Locations of the adjustmentsare shown in Fig. 6 - 1 and Fig. 6 - 2.
(1 ) Adjustment of the Rating Voltage
A. Connect an accurate (f0.1%) external multimetertomeasure the dc voltageat output terminals of the power supply.
6. Set the COARSE and FlNE VOLTAGE controls to minimum (fully counterclockwise).
C. Turn the COARSE and FlNE VOLTAGE controlsto maximum(fully clockwise).
D. Adjust trimmer pot VR105 for a reading of rate voltsxl.05 on the mulitimeter.
E. Set the COARSE and FlNE VOLTAGE controls for a reading of rate volts on the multimeter.
F. Adjusttrimmerpot VR301 (VR201digitaltype)forareadingof rate voltsonthevoltmeter(DigitalPanel meter, digital
type) of the power supply.
(2) Adjustment of the Rating Current
A. Set the CURRENT control to minimum (fullycounterclockwise).
B. Connect - the external multimeter to measure dc current at the output terminalsof the power supply.
C. Set the COARSE and FlNE CURRENT controlsto minimum (fully counterclockwise).
D. Adjust trimmer pot VR107 for reading of 0amps on the multimeter.
E. Set the COARSE and FlNE VOLTAGE controlsto
a centeredposition.
F. Setting and turn the COARSE and FlNE CURRENT controls to maximum (fullyclockwise).
G. Adjusttrimmer
pot VR108 for areading of 112rateampsxl.05 on the multimeter. (LO current)
H. Adjust trimmer pot VR109 for a reading of rate ampsxl.05 on the multimeter. (HIcurrent)
I. Readjust the CURRENT control for a reading of rate amps on the multimeter.
J. Adjusttrimmerpot VR110(HI), VR11l(L0)tocalibratetheAmmeter or Digital panel meter of thepowersupply for the
same reading as the multimeter.
64 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 power supply.

MrN. MAX.
GPS - 846 - 1
8". VLO
@ VR301 VR107 VRlO8 GPS - 846 - 2
GPS - 846 - 7 @ "I
VR109
GPS - 846 - 6
El
VR112
CIP
VRllO VRll1
00
LO HI
VRlO5
MAX.
VOLTS.
Fig. 6 - 1 Adjustment Location Fig.
6 - 2 AdjustmentLocation