SYSTRON DONNER TL8-3 Series User manual

INSTRUCTION MANUAL
ON
STABILIZED
TRIPLE POWER SUPPLY
TLS-3 SERIES
SVSTRON
G M B H
DONNER

Note:
Address:
INSTRUCTION MANUAL
AC
MODEL TL8-3 EG and TL8-3 EG OV
STABILIZED TRIPLE POWER SUPPLY
....
,,,.. tl
...... ······:.f
············ ........ .
···::···~:···~~···::: .. .
••' ,,•! ... ••' ee•!!!.ttt'!
...... ~.;..·• ~dlf·'
,., .•.• ~.~ .. ~ ............
~~~ •••tr,,er,,.,....
!dt• .......
~.,!i"'r .
.,
In case of technical questions or spare part requests please specify
the model and serial-No.
of the power supply.
SYSTRON DONNER GMBH, 8 Munchen 60, BodenseestraBe 113
Telephone: [phone]

WARRANTY.
SYSTRON-DONNER instruments are warranted during a period of one year from
date of shipment to the original purchaser to be free from defects in
material and workmanship. This warranty does not apply to vacuum tubes,
except as they are warranted
by the tube manufacturer. The liability of
SYSTRON-DONNER under this warranty is limited to replacing or repairing
any instrument or component thereof which is returned by the buyer, at
his expense during the one year period and which has not been subjected
to mis-use,
neglect, improper installations, repair, alteration or
accident.
SYSTRON-DONNER shall have the right of final determination as
to the existance and cause of the defect. In no event shall SYSTRON-
DONNER be liable for collateral or consequential damages.
This warranty is in lieu of any other warranty, express, implied or
statutory, and no agreement extending or modifying it will be binding
upon SYSTRON-DONNER unless it is made in writing and signed by a duly
authorised
officer of the company.
RECEIVING INSPECTION.
Every SYSTRON-DONNER instrument is carefully inspected and is in perfect
working order at the time of shipment. Each instrument should be checked
as
soon as it is received. If the unit is damaged in any way or fails to
operate, a claim should immediately be filed with the transportation
company.
REPAIRS.
Whenever a SYSTRON-DONNER instrument requires service, the near est
SYSTRON-DONNER representative should be contacted. All representatives
will provide immediate
service or arrange the return of the in str ument
to the factory if necessary.
Please specify both
model and serial number in all correspondence
concerning claims for warranty
repair. Address all enquiries to
SYSTRON-DONNER GMBH., 8 MONCHEN 60, BODENSEESTRASSE 113,
Telephone:
(0811) 871 10 21.
i i
TL 8-3/2-73

SECTION
1
2
3
4
5
TABLE OF CONTENTS .
DESCRIPTION
1.1 Introduction ...... .............. .... .... .
1.2 General Features
.. .. . ... . . . . . . .. . .... ... .
1.3 Precautionary
Measures .. . .. . . . .. . .. . .. . . .
1.4 Specification
Data Sheet . .... .. .. . ...... .
OPERATION
2.1 Electrical Connections ...... . ........... .
2.2 Controls
.. . . .. ............ .. . ... ... ..... .
2.3 Operation
.. . ...... .. .......... . ... . .. ... .
THEORY OF OPERATION
3. 1 Genera 1 . .... .............. .. . . ... ... ... . .
3.2 Optional Features
.. ...... .. .... ........ ..
3.3 Block Dfagram . . . . . . .... . .... ......... .. . .
MAINTENANCE
4. 1 Genera 1 . . .•.•• .•• •...• . . • . . •.•..•...•.•.•
4.2 loads and Interconnections ......... . .... .
4.3 Troubleshooting
.. . ..... . ... . . . ... . . .... . .
CALIBRATION
5.1 Genera 1 •..• .•.• •. ••..•• . ••.. ..•.•... . .••.
5.2 Test Equipment Required . ..... ... . ... . .. . .
5.3 Calibration Procedure ...
.. . ............. .
APPENDICES
PAG E
1-1
1-1
1-2
1-3
2-1
2-1
2-2
3-1
3-2
3-3
4-1
4-1
4-1
5-1
5-1
5-1
Troubleshooting Guide . . . . ....... ... . .. A-1 t o A-5
Component Part Plan 0001 / 2 . .......... .
C omponent Part Plan 0002 / 3 . . . . ...... . .
Schematic
Diagram . . ........... . ...... .
TL 8-3/2-73 ; i i

MEASUREMENT OF REGULATION AND RIPPLE
The specifications cited herein for regulation and ripple can be
readily attained on every SYSTRON-DONNER power supply, provided the
proper
method of measurement is employed. The major consideration
is that the highly stable meter and oscilloscope, specified in the
calibration section test procedures, must be connected to the sensing
terminals
and not the load terminals. The reason for this precaution
is
that the voltage drop between the load terminals and sensing
terminals will
yield an inacurate regulation ripple measurement.
i iii
TL 8-3/2-73

SECTION 1
DESCRIPTION
1.1
INTRODUCTION
The TL 8-3 Triple Output Lab Series power supplies are
flexible and dependable sources of D.C. power, which can be used to meet
a variety of needs. These needs may range in scope from inspection and
production testing, to laboratory bench testing and systems applications.
The wide range of outputs available makes these units well
suited for use as basic laboratory power sources. The ability to provide
power packaged in minimum space with high reliability meets the demands
of most systems and laboratory requirements.
All components used in the construction of the Medium Power
Half Rack units are of the highest quality available, and have been
subjected to 100% incoming inspection.
Each electrolytic filter capacitor is of computer grade, and
has been quoted by the manufacturer as having a life expectancy exceed-
ing ten (10) years.
All silicon transistors have been
11
derated
11
and
temperature aged to provide high reliability. All rectifiers are her-
metically sealed
silicon units, and all zener diodes have been tempera-
ture stabilized.
1.2
GENERAL FEATURES
Independent metering for each output allows simultaneous
monitoring
of voltages and current. A front panel lamp indicates an
overload condition on any of the three outputs. Coarse and fine output
controls for
each output permit precise adjustability.
Constant Voltage Mode
A constant voltage is maintained across the output terminals
at any preset value from zero to rated voltage output, provided that the
load does not
draw more than the rated output current.
Automatic Current Limiting
Short circuit protection is provided by the Automatic Current
Limiting circuit which limits the maximum output current under al l load
conditions.
The point at which automatic current limiting occurs is at
approximately 110% of the maximum rated current output of the unit. In
the event of a short circuit, the output voltage will drop to zero, and
will return to its previous level only upon removal of the short ci rcuit.
TL 8-3/2-73 1-1

Automatic Overvoltage Protection (Optional Feature, " A" output only)
Automatic Overvoltage
(OV) protection prevents the output
voltage
from exceeding the programmed voltage and can be internally
adjusted through an access slot in the cover.
1.3
PRECAUTIONARY MEASURES
Wire Size
To assure proper regulation under all load conditions, and to
prevent severe
distortions of the AC line voltage, it is very important
to take into consideration the physical
size and current handling capa-
bilities of the input power line. Serious losses in regulation and an
increase in ripple may result from underrated or overloaded AC input
lines. The maximum AC impedance from the breaker box to the power supply
input should not exceed 0.75
ohms.
Voltage Regulator and Inverter Inputs
Do not use voltage regulators or inverter s as a primary
power source. The outputs of these devices are usual ly not sinusoidal in
nature,
and if used as the AC source for the power supply, may cause
serious loss
of regulation of the power supply output. Capacitive input
filtering used for semiconductor power supplies requires charging to the
peak of the rectified AC wave which non-sinusoidal AC sources may not
provide.
Systems Considerations
In systems applications it is recommended that each powe r
supply input
power line be run separately to the AC distribution box, in
order to
m1n1m1ze cross coupling and interaction between equipment. To
keep the AC ripple in the output to a minimum , it is recommended that the
AC input cables should not be run in close proximity to the output load
cables.
1-2
TL 8-3/2-73

. SV~TADN ~DONNER
FEATURES
e THREE OUTPUTS - IND E PENDENTLY ADJUSTABLE
e AUTOMAT IC EL ECTRON IC CURREN T LI M IT ING
e NO TURN ON /TURN OFF TRAN SI ENTS
e THREE INDEPENDENT DUAL RANGE M ET ERS
e OVE RVOLTAGE PROTECTION OPTION
ELECTRICAL SPECIFICATIONS
Input: 220 VAC ± 10%; 47-65Hz
Output :<1> Triple Floating; isolated from ground, 300 VDC max.
A) 0 to + 8 VDC, 3 ampere; rating reduces to 2 ampere at 0 VDC .
B) 0 to + 32 VDC, 1ampere; rating reduces to 0.5 ampere at
OVDC.
C) 0 to -32VDC at 1ampere; rating reduces to 0.5 ampere at
OVDC.
All outputs are referenced to a common return electrica
ll y
isolated from chassis ground.
Regulation,Line: 0.02% or 2 mV*, for 200-240VAC line change,
at any output within specifications.
Regul at ion, Load: 0.02% or 5 mV*, no load to full load, at any
output within specifications.
Ripple: 500 pV RMS ; 3 mV p-p. (10 MHz)
Stab ili ty: 0.05% or 10 mV*, for 8 hours after warm-up.
Measured at constant line voltage, load and ambient
temperature.
Tem perature Co effi ci ent: (0.02% + 400 ,uVWC
Temperature Range: 0 oc to + 40 °C. ·
Recove ry Time: 50 microseconds to within 0.05% or 15 mV * of
output voltage, for 80% step change
in rated load (.21oad to
full load)
Short Circuit Protection: Automatic Electronic Current Li miting.
AC Power Input Protection: Fuse.
Voltage Adjustment Range: Continously adjustable vernier
controls.
*Whichever is greater.
(1) At maximum line voltage condition, the total output current should not exceed
80%
of total allowable current.
SVSTRCN rlf£?.:) CONNER
G M B H
TL8-3 TRIPLE OUTPUT
LAB SERIES
Output
Impedance*
Model Volts Amps
TL8-3EG 0 to +8VDC
0-3
0 to
+32 V DC 0- 1
Oto -32VDC 0- 1
• N omi nal
GENERAL AND PHYSICAL
SPECIRCATIONS
DC-1 KHz
0.003
0.010
0.010
Operation Mode: Constant voltage with automatic current
limiting.
Controls:
Voltage: Coarse and Fine;0 to rated output; front panel. Reso-
lution 1 mV on fine contr ol.
Input Power: Front panel switch and indicator, AC ON.
Metering: (3) Combination Volt/Ammeters with front panel
selector switch.
Terminals:
Front Panel: Positive output A, Positive output B, Negative
output
C, common return, chassis ground.
Overvoltage Protection: Inte rn al adjustable overvoltage protec-
tion is available, as a factory option on output A (0 to + 8
VDC)
Size: 77/a" W x 47/a" H x 12e/1e" D
Weight: 16 lbs.
8 Mi.inchen 60, BodenseestraBe 113
Telefon [phone] Telex 5-29615

Block Diagram Series Pass
Amplif i er
+
Differential-
Amplifier Option:
OV- Protection
~-----4---4--~--4---------------------------------~------~o Common
Thermal -
Fuse
Line- Fuse
AC - Line
AC LINE CORD
7 FEET LONG WITH
3 PRONG MOLDED
MALE PLUG
-Refere ces
/
OPTIONALOVS
MODULES
(4) RUBBER FEff (REMOVABLE)
U0-32 THREAD ' :D MOUNTING)
-
Differential-
f-:.-- --~~--------------(0 - C- Output
Current- Sensing
13' '
I
)
cl
1
\:
v
2 3/8 '' 9 l/2"
Description
•11-l--~@ GND
\_
~
t-
-,
_j
The TLB-3 Tr iple Output Lab power supply is a multiple
output unit specifically designed
for laboratory applications
utilizing
IC circuitry. Independent output voltages are
provided to allow simultaneous
power to be supplied to
a typical
IC (digital or analog) breadbord circuit, as well as
simultaneously,
two additional independent power sources
for typical au xiliary circuitry. Output voltage and currents
may be independen
tl y monitored
A variety
of voltage and current outputs are available
providing unexcelled operational versatility and flexibility.
Th is output flexibility permits the user to have complete
convenience
in filling laboratory power requirements.
The Triple Lab
Power Supply utilizes silicon semiconduc-
tors permitting operation at its maximum temperature
rating without derating.

SECTION 2
OPERATION
2.1. ELECTRICAL CONNECTIONS
Input, Power
A heavy duty 3 wire line cord and molded plug with grounding
prong provides a path for input
power to the unit.
The power handling ability of the AC power lines feeding AC
power to the li~e cord must be considered, as serious losses in
regulation
and substantial increases in ripple can occur as a result of
insufficient power handling capacity of these lines. The AC impedance
from the breaker box to the power supply input connector should not
exceed 0.75
ohms. All AC power line connections must be securely
tightened, and any movable electric contact surface (such as the wiper
arm of a variable transformer) should be kept clear of impedance
producing oxide coatings.
Care should be exercised in selecting the proper wire size
for the AC input lines. The figures listed in Table 2-1 will serve as a
guide in
making this selection.
TABLE 2-1 - AC INPUT WIRE SIZE
Length of Run (Single Lead) Wire Size (AWG Standards)
10 feet or less 12
10 feet to
20 feet
10
20
feet to 50 feet
8
50
feet
to 100 feet 6
Output, Front Panel
Five bindung post terminals mounted on the front panel provide
output
and ground connections.
TL 8-3/2-73 2-1

2.2 CONTROLS
Front Panel
FRONT PANEL CONTROLS
Name Function
AC POWER Toggle switch, controls input power
VOLTAGE ADJUST Potentiometer,
adjusts
voltage output
(Coarse)
VOLTAGE ADJUST Potentiometer,
adjusts
voltage output
(Fine)
METER SELECT Rotary switch, controls function of
(
V, I) (2 pos.) output meters
Internal
All
internal control settings have been factory preset, and
require no additional adjusting. However, if it should become
necessary to adjust any of the internal controls due to circuit changes
caused
by component aging or replacement, refer to the calibration section
of this instruction manual .
2.3
OPERATION
Control Settings
Set all coarse and fine output controls fully CCW and set the
meter select switch to V.
Grounding
Either
side of either output may be grounded or the outputs
may be used in a floating condition.
Power On
Connect the power supply to a nominal AC power source. Set
power switch SlOl to AC-ON, and observe that pilot lamp DSlOl glows .
Warm-up
No warm-up time is necessary to place the unit into operation.
However, a 30 minute warm-up period is recommended to reach rated
stability.
2-2
TL 8-3/2- 73

3.1. GENERAL
SECTION 3
THEORY OF OPERATION
The purpose of the TL 8-3 Triple Output Lab Series power
supplies is to transform and rectify the AC input a well regulated,
stable and adjustable DC output. The following paragraphs describe the
major
circuits. As each circuit is described, reference should be made
to the schematic diagram in the rear of this manual.
Primary Input
Input
power is obtained through transformer TlOl full wave
rectifier diode sets (CRl, CRlO), (CR2, CRll), (CR19, CR20) and filter
capacitors C3, ClO and Cl7 .
When AC power switch SlOl is set to AC-ON, AC pilot lamp
DSlOl glows, and AC pqwer is applied to TlOl. Regulated DC output power
is immediate·ly available .
Reference Supplies
The C3 voltage appears across the +12V and (+lOV, +6.2V)
reference supplies~ These reference voltages are, in turn, developed
across
CR25, CR5 and CR6, respectively.
The ClO voltage appears across the -12V and (-lOV, -6.2V)
reference supplies. These reference voltages
are, in turn, developed
across
CR26, CR14 and CR15, respectively.
Series Regulator
The rectified and filtered voltages from the three input
rectifier sections are directed through each of the respective series
pass transistors. The conduction of each of these transistors is
controlled by independent circuitry which causes them to act as variable
resistors. Their overall resistance varies in accordance with the need
of the power supply to increase or decrease the output voltage.
Each pass transistor is controlled by a driver transistor
which is, in turn, controlled by the corresponding voltage (error)
amplifier.
Voltage (error) Amplifier
The theory of operation for all three voltage amplifiers
is identical. A sample of the output voltage is compared with a stable
reference (see Reference Supplies) at the base of the input stage of
the
amplifier. An unbalance caused by a voltage change at either the
output terminals or across the output control pots will appear as a
voltage change
at the collector of the first stage. For exa m ple, an
TL 8-3/2-73 3-1

increase in output causes the first stage to turn off, turning on the
second
transistor, turning off the third transistor and turning off the
driver transistor. This causes the pass to be turned off and the
output voltage to decrease.
Current Limit Circuit
In the case of all three current limit circuits, a voltage
drop
is sensed across a small resistance in series with each output.
As current increases, this voltage drop increases, eventually turning
on a transistor in its current limit circuit which turns off the first
stage of the voltage amplifier for this output. This has the overall
effect of independently shutting down this output.
3.2
OPTIONAL FEATURES
Overvoltage (OV) Protection
If the output voltage should use above the threshold set
by the OV pot, the OV sensing transistor will turnon, turning on the
SCR driver. This applies a signal to the gate of the SCR causing it to
"fire" and place a "crowbar" across the output. This short circuits the
output
and activates the current limit circuit which turns off the pass
transistor.
3-2
TL 8-3/2-73

-l
r
(X)
I
(..)
........
1\)
I
""'-~
(..)
(..)
I
(..)
+
Series Pass Current -Sensing
'l.,1
T I
1-Q-I
t t
(O)+A-Output
Amplifier
6
t
Series Pass
I
::!r-
Different
i
al-
Amplifier
Current-Sensing
V-Adjust
t Option:
OV-
Protection
v
T I
1-D-1
11
I
~
+8-0utput
V-Adjust
6 J
Current-
Li-
.
1:
mitindicator . . l I I <]
L....J-
1
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1-
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f_e_r_e-n
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t-:-i
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-
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l~
_,...
+Refer
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'Switch
Gl
t 1 1 1 1
-
rmnstormo:
-
(oJ
common
Thermal-
Fuse
~
Line-Fuse
AC
·Li
ne
*·
I
-Refere~ces
Amplit~
\l
T
Differential
-
Amplifier
<]
f.
l V-
Adjust
7'\
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1-D-1
•
(2)-
C-
Output
Series Pass
Current
-
Sensing
•II
(c))
GND
CD
-
0
0
A'
0
0
(C
....
0
3
.....
0
-f
r
(X)
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w
m
G>

4.1.
SECTION 4
MAINTENANCE
---- - ---------- - ---- - ---~----------
GENERAL
- WA R N I NG-
High Voltages Are Present
Use Caution
This power supply is a prec1s1on instrument. It is
strongly recommended that only experienced troubles ho oting personnel
perform troubleshooting operations or attempt
to repair the unit. If
the power supply appears to be malfunctioning at all, the fol l ow i ng
procedure is recommended for isolating possible defect s.
4.2 LOADS AND INTERCONNECTIONS
1. Disconnect all interconnections and loads to which t he
unit is normally connected.
2. Connect a
separate resistive dummy load across each output
terminal. This load should be of su fficie nt value to allow
the
unit to operate at its maximum rate d current and
voltage output.
3.
Apply nominal AC input power to the unit and check for
normal operation. Satisfactory operati on at this time woul d
indicate that any malfunction previously enc o un t er ed, is
external in nature. All interconnections an d lo ads normally
used in conjunction with
this power supply should t he n be
carefully checked for electrical defects.
4.3 TROUBLESHOOTING
1. Set VOLTAGE ADJUST and VOLTAGE VERNIER controls f ul ly CW.
Using a 20,000 ohms per volt voltmeter or oscil loscope,
check
the voltages across the various circuit co mponents
listed in the TROUBLESHOOTING GUID E, located immed i ately
before the schematic diagram at the rear of this instructi on
manual.
The sample voltages listed in th is guide app ly only
if the unit is operating at its nom inal AC input, and has no
load on any output unless otherwise specified . Any reading
which is grossly incorrect indicates that the stage being
tested or the one immediately preceding it , i s defect ive.
The Schematic Diagram and appropriate sectio ns of the Theory
TL 8-3/2-73 4-1

of Operation will prove helpful in any troubleshooting
work. Proper polarity to be observed when testing can be
easily obtained from the Schematic Diagram.
2.
If voltage checks show no noticeable deviat i ons from the
prescribed
values, disconnect AC power and proceed with
point-to-point resistance checks across pots, switches,
diodes,
resistors, transistors, in that order.
3.
When the trouble is of an intermittent nature, such as poor
regulation, ripple, etc., the use of an oscilloscope to
determine dynamic changes will be necessary.
4-2 TL 8-3/2-73

SECTION 5
CALIBRATION
5.1 GENERAL
The following adjustments should be made when necessary to
assure optimum operating characteristics and maximum efficiency of the
SYSTRON-DONNER power supply.
5.2
TEST EQUIPMENT R EQUIRED (or equivalent)
(A) Oscilloscope, Tektronix Type 561
(B) Differential Amplifier Plug In, Tektronix Type 63
(C) Time Base Plug In, Tektronix Type 67
(D) Differential VTVM, Fluke Model 825A
(E) DC Ammeter, Weston Model 901
5.3 CALIBRATION PROCEDURE
(A) Maximum Voltage- set front panel
11
V ADJ
11
fully clockwise,
and
11
Fi ne
11
fully counter-clockwise for a 11 three outputs.
Adjust
maximum voltage control R92 (0 to +32V), R93 (0 to -32V),
and R94 (0 to +8V) to obtain the maximum rated output voltage
for each
~utput.
(B) (0 to +8V) Maximum Current - set output voltage equal to
8.00 VAC ± 10 mv. Monitor Vout with a scope (10mv/cm scale).
Rotate the current adjust pot (R59) fully clockwise. With an
external DC current meter and a variable load adjust the out-
put
current to 3.3 Amps. ±100ma. Slowly rotate R59 in the
counter-clockwise
directi~n until an affect is seen on the
output voltage.
Check the setti ng by adjusting the variable
for max. current. The maximum current the until should be
capable of is 3.3 Amps.
(c)
Meter Circuit -Place the meter select switch in the volts
position. Adjust each output to its nominal voltage ±20mv.
(Differential VTVM, Fluke Model 825A is recommended). Calibrate
each meter by adjusting the pot R26a for +32V -Output; R51a for
-32V -Output and R55a for m8V -Output.
Place the meter
select switch in the Amps position, then l oad
down one output at a time . Monitor the output current care-
fully with an accurate DC current meter. For the 0 to +32V
output, adjust R16 so both the
11
A
11
meter and the reference
meter
indicate the sa me current. For the 0 to -32V output,
calibrate the
11
B
11
meter by adjusting R50. Finally, calibrate
the
11
C
11
meter with R54 .
TL 8-3/2-73 5-1

Symptom
Zero output
voltage
Zero or
small nega-
tive output
voltage
Zero or
small pos-
itive out-
put voltage
Large
and
unregulated
output volt-
age
Output does
not current
1imit
A-1
TROUBLESHOOTING GUIDE
0 to +32V Output
Possible
Problem Area
AC Input Section
Rectifier Section
or
-6.2V·and -10V
Reference Section
Series Pass
and
Driver Section
Voltage Amplifier
Circuit
Current Limit
Circuit
Series Pass and
Driver Section
or
Voltage Amplifier
Circuit
Voltage Amp. Ckt.
or
Current Limit Ckt.
or
-12V Reference
Section
Vin · ~ 220VAC
No load on output unless
otherwise specified
If the AC power lamp (DS101) is off,
one or more of the components listed
has probably failed.
F101 open circuit; S101 open circuit;
S102 open circuit.
Measure the voltages across the follow-
ing components.
Check the levels
measured with those indicated below.
C3.,.~ 26V; CR14F-.'>· lOV; CR15~Y6.2V
Measure the voltage drop across the
base to emitter junction of QlOl and
Q3 (across R9 and R6). Both tran-
sistor junctions should be forward
biased.
The base to emitter voltages of Q20,
Q5 and Q6 should be about 0.6 volts DC,
in the forward direction for that
transistor.
If the voltage across R14 is approx-
imately zero, then Q4 should be cutoff
and CR7 reversed biased.
If the voltage across R14 is signi-
ficant, then there is current flowing
in the supply.
The output terminals
are probably shorted to common.
~ -~-
Check QlOl for collector emitter sh ort
II Q3 II II II II
II
Q20 II II II II
II Q6 II II II II
II 05
II
II
Probably Q4 has failed
has failed open.
11
open
open and/or CR7
Measure the voltage across CR26,
level is approximately 12 volts.
the
TL 8-3/2-73