BK PRECISION
®
OPERATION &
MAINTENANCE MANUAL
Model 1790 High Current Power Supply
Limited Two Year Warranty
B & K Precision Corp. warrants to the original purchaser that its product and
the component parts therof, will be free from defects in workmanship and
materials for a period of two years from the data of purchase.
B & K Precision Corp. will, without charge, repair or replace, at its' option,
defective product or component parts. Returned product must be
accompanied by proof of the purchase date in the form a sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered
by completing and mailing the enclosed warranty card to B & K Precision
Corp. 22820 Savi Ranch Parkway Yorba Linda, CA-92887, within fifteen
(15) days from proof of purchase.
Exclusions: This warranty does not apply in the event of misuse or abuse of
the product or as a result of unanthorized alternations or repairs. It is void if
the serial number is alternated, fefaced or removed.
B & K Precision Corp. shall not be liable for any consequential damages,
including without limitation damages resulting from loss of use. Some states
do not allow limitation of incidental or consequential damages, so the
above limitation or execlusion may not apply to you.
This warranty gives you specific right and you may have other rights, which
vary from state-to-state.
Model Number: ______________
Date Purchased: __________
OPERATORS SAFETY SUMMARY
The general safety information in this part of the summary is for both operating & servicing
personnel. Specific warnings and cautions will be found throughout the manual where they
apply, but may not appear in this summary.
TERMS IN THIS MANUAL
CAUTION :
WARNING :
Statements identify conditions or practices that could result in damage to
the equipment or other property.
Statements identify conditions or practices that could result in personal
injury or loss of life.
TERMS AS MARKED ON EQUIPMENT
CAUTION :
Indicates a personal injury hazards not immediately accessible as one
reads the markings,or a hazard to property, including the equipment itself.
Indicates a personal injury hazard immediately accessible as one reads
the marking.
!
DANGER :
POWER SOURCE :
This product is intended to operate from a power source that does not
apply more than 130V rms between the suply conductors or between either supply conductor
and ground. If the Internal Tap is selected for 230V AC operation, then the input voltage should
not be more than 250V rms. A protective ground connections by way of the grounding conductor
in the power cord is essential for safe operation.
GROUNDING THE PRODUCT :
This product is grounded through the grounding conductor
of the power cord. To avoid electrical shock, plug the power cord into a properly wired receptacle
before connecting to the product input or output terminals. A protective ground connection by
way of the grounding conductor in the power cord is essential for safe operation.
DANGER ARISING FROM LOSS OF GROUND :
Upon loss of the protective ground
connection, all accessible conductive parts (including knobs and controls that may appear to
be insulating) can render an electric shock.
USE THE PROPER POWER CORD
Use only the power cord and connector specified for your product.
Use only a power cord that is in good condition.
Refer cord and connector changes to qualified service personnel.
USE THE PROPER FUSE :
To avoid fire hazard, use only Fuse / MCB of the correct type,
voltage rating and current rating as specified in the parts list for your product.
DO NOT OPERATE IN EXPLOSIVE ATMOSPHERES :
To avoid explosion, do not operate
this instrument in an explosive atmosphere unless it has been specifically certified for such
operation.
DO NOT OPERATE UNIT WITHOUT COVERS :
this product without covers or panels installed.
To avoid personal injury, do not operate
TABLE OF CONTENTS
SECTION
1
2
3
4
5
6
7
8
9
PARTICULARS
GENERAL INFORMATION
SPECIFICATIONS
INSTALLATION
OPERATING INSTRUCTIONS
TESTING & CALIBRATION PROCEDURE
SERVICE INSTRUCTION
PART LIST
SCHEMATICS
CIRCUIT DIAGRAMS
PAGE NO.
1
2
3
7
15
17
33
38
43
SECTION - 1
GENERAL INFORMATION
1.1
DESCRIPTION :
The 1790 (349) High Current Regulated D.C. Power Supply is completely solid and
suitable for bench operation or standard 19" rack operation. It is a well regulated
constant voltage / constant current supply which delivers 0-32V at 0-20Amps
and can be adjusted continuously throughout the output range. When the supply
is used as a constant voltage source the front panel VOLTAGE controls can be
used to limit the output voltage. When the unit is used as a constant current source,
the front panel CURRENT controls can be used to limit the output current. The
unit will automatically cross over from constant voltage to current mode and vice-
versa if the output current or voltage exceeds these limits.
Output voltage and current are continuously monitored on two front panel meters.
The load terminals and remote sense terminals are provided on the front panel.
Either the positive or negative output terminal may be grounded or the power supply
can be operated floating at upto a maximum of ±300VDC above ground.
OUTPUT ON/OFF SWITCH :
The output voltage and Current can be preset without connecting the power supply
to the load. With the OUTPUT ON/OFF switch in the OFF position, the maximum
voltage and current limits can be set. Pressing the OUTPUT ON switch connects
the output of the power supply to the load.
LIMIT SETTING :
The voltage and current limits can be set when the output is not connected to the
load. With the OUTPUT ON/OFF switch in the OFF position and the LIMIT switch
pressed, the voltage and current limits can be set with the front panel VOLTAGE
and CURRENT potentiometers.
REMOTE PROGRAMMING ( With External 5K Pot ) :
The output voltage of the unit can be programmed between 0 to 32V by means
of an external remote programming voltage resistor. An external resistance
programming selector link is provided on the rear panel for this purpose.
REMOTE SENSING :
The degradation in regulation which occurs at the load due to voltage drop in the
load leads can be eliminated by using the power supply in the remote sensing
mode operation. The remote sensing mode is selected by a push switch on the
front panel.
1.2
1.3
1.4
1.5
1
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