Bk Precision 1901 User Manual
Model 1900, 1901, 1902
Switching DC Power Supply
INSTRUCTION MANUAL
1 Safety Summary
The following safety precautions apply to both operating and maintenance personnel and
must be observed during all phases of operation, service, and repair of this instrument. Before
applying power, follow the installation instructions and become familiar with the operating
instructions for this instrument.
GROUND THE INSTRUMENT
To minimize shock hazard, the instrument chassis and cabinet must be connected to
an electrical ground. This instrument is grounded through the ground conductor of
the supplied, three-conductor ac power cable. The power cable must be plugged
into an approved three-conductor electrical outlet. Do not alter the ground
connection. Without the protective ground connection, all accessible conductive
parts (including control knobs) can render an electric shock. The power jack and
mating plug of the power cable meet IEC safety standards.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the instrument in the presence of flammable gases or fumes.
Operation of any electrical instrument in such an environment constitutes a definite
safety hazard.
KEEP AWAY FROM LIVE CIRCUITS
Instrument covers must not be removed by operating personnel. Component
replacement and internal adjustments must be made by qualified maintenance
personnel. Disconnect the power cord before removing the instrument covers and
replacing components. Under certain conditions, even with the power cable
removed, dangerous voltages may exist. To avoid injuries, always disconnect power
and discharge circuits before touching them.
DO NOT SERVICE OR ADJUST ALONE
Do not attempt any internal service or adjustment unless another person, capable of
rendering first aid and resuscitation, is present.
DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRUMENT
Do not install substitute parts or perform any unauthorized modifications to this
instrument. Return the instrument to B&K Precision for service and repair to ensure
that safety features are maintained.
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ng the line cord to the AC mains, check the rear panel
WARNINGS AND CAUTIONS
WARNING and CAUTION statements, such as the following examples, denote a
hazard and appear throughout this manual. Follow all instructions contained in
these statements.
A WARNING statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in injury or death to
personnel.
A CAUTION statement calls attention to an operating procedure, practice, or
condition, which, if not followed correctly, could result in damage to or destruction
of parts or the entire product.
WARNING:
WARNING:
CAUTION:
CAUTION:
Do not alter the ground connection. Without the protective ground
connection, all accessible conductive parts (including control knobs)
can render an electric shock. The power jack and mating plug of the
power cable meet IEC safety standards.
To avoid electrical shock hazard, disconnect power cord before
removing covers. Refer servicing to qualified personnel.
Before connecti
AC line voltage indicator. Applying a line voltage other than the
indicated voltage can destroy the AC line fuses. For continued fire
protection, replace fuses only with those of the specified voltage and
current ratings.
This product uses components which can be damaged by electrostatic discharge (ESD). To avoid damage, be sure to follow proper
procedures for handling, storing and transporting parts and
subassemblies which contain ESD-sensitive components.
SAFETY SYMBOLS
This symbol on an instrument indicates that the user should refer to the
operating instructions located in the manual.
Certification
We certify that this product met its published specifications at time of shipment from the
factory.
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Compliance Statements
Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and
other European countries with separate collection systems)
This product is subject to Directive 2002/96/EC of the European
Parliament and the Council of the European Union on waste
electrical and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market
after August 13, 2005, and should not be disposed of as
unsorted municipal waste. Please utilize your local WEEE
collection facilities in the disposition of this product and
otherwise observe all applicable requirements.
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Contents
1 Safety Summary ........................................................................................ 1
2 Introduction .............................................................................................. 5
3 Controls and Indicators ............................................................................. 6
3.1 Front Panel ........................................................................................ 6
3.2 Rear Panel ......................................................................................... 7
4 Operating Instructions .............................................................................. 8
4.1 Using the Power Supply .................................................................... 9
4.1.1 Connection ................................................................................ 9
4.1.2 Self Test Sequence .................................................................... 9
4.1.3 Control Knobs .......................................................................... 11
4.1.4 Using Both Main and Auxiliary Outputs .................................. 12
4.2 Control Modes ................................................................................ 12
4.2.1 Normal Mode .......................................................................... 13
4.2.2 Preset Mode ............................................................................ 13
4.2.3 Set Mode ................................................................................. 14
4.2.4 Remote Control Mode ............................................................ 15
4.3 Remote Sensing............................................................................... 15
4.3.1 Connection .............................................................................. 15
4.3.2 Disconnection .......................................................................... 16
4.4 Remote Control ............................................................................... 16
4.4.1 Voltage Remote Control .......................................................... 16
4.4.2 Enable and Disable the Output ............................................... 20
5 Faults and Troubleshooting .................................................................... 21
5.1 OVP: Overvoltage Protection ......................................................... 21
5.2 OTP: Overtemperature Protection ................................................. 22
5.3 OLP: Overload Protection ............................................................... 22
5.4 Fuse Replacement ........................................................................... 23
6 Specifications .......................................................................................... 24
7 Certification ............................................................................................ 26
8 Service Information ................................................................................ 27
9 Limited Two-Year Warranty .................................................................... 28
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2 Introduction
B&K Precision models 1900, 1901, and 1902 are laboratory grade switching mode DC
power supplies with high current output in a small form factor and lightweight
package. The 1900 Series provide different configurations of high output voltage or
high output current and make setting voltage and current levels fast and precise
through its dual action, course/fine rotary encoder control. In addition to its constant
voltage (CV) and constant current (CC) modes, the high efficiency DC power supply
offers a unique solution with its preset and analog remote control modes. Save up to
three different presets of voltage and current values for quick recall. The analog
remote control function allows the output power, voltage, and current to be adjusted
without touching the front panel of the power supply. A remote sensing terminal
(model 1900 only) is also available for use to compensate for voltage drop across
load leads. These features make the 1900 Series suitable for a wide range of
applications including production testing, telecommunications, R&D, service, and
university labs.
Features
• Automatic CV/CC crossover operation
• Up to 60 A output current
• Lightweight and compact
• Rotary encoder control for precise voltage and current setting
• 3 user-defined voltage and current presets
• Analog remote control function
• Remote sensing terminal (model 1900 only)
• Overvoltage, overtemperature, and overload protection
• Front panel auxiliary output
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3 Controls and Indicators
3.1 Front Panel
Figure 1 - Front Panel
(1) LED panel meter display with CV/CC indicator
(2) Rear Control Indicator (lights up when using Preset/Remote Control/Set mode)
(3) Output Voltage Control Knob (control main and auxiliary output voltage)
(4) Output Current Control Knob (control main and auxiliary output current limit)
(5) Power ON/OFF Switch
(6) Auxiliary Output Terminal (max 5 A)
Note: Please see
auxiliary output terminals together.
Section 4.1.4 for more details on using both main and
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3.2 Rear Panel
Figure 2 - Rear Panel
(7) Main Output Terminal (max 60 A for 1900 / 30 A for 1901 / 15 A for 1902)
Note: Please see
auxiliary output terminals together.
(8) Remote Sensing Terminal (model 1900 only)
(9) Mode Selection Switch (Normal, Preset, Remote Control, Set Modes)
(10) Recall Preset Selection Switch
(11) Analog Remote Control Terminal
(12) Cooling Fan Air Intake Grille
(13) AC Input Plug and Fuse Compartment
Section 4.1.4 for more details on using both main and
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