Global Specialties 1412 User manual

80W Triple Range Switching
DC Power Supply
User
Manual
1412
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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 ammable
gases or fumes. Operation of any electrical instrument in such an
environment constitutes a denite 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 qualied 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 rst aid and resuscitation, is
present.
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DO NOT SUBSTITUTE PARTS OR MODIFY THE INSTRU-
MENT
Do not install substitute parts or perform any unauthorized
modications to this instrument. Return the instrument to Global
Specialties (Cal Test Electronics) for service and repair to ensure
that safety features are maintained.
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
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.
WARNING
To avoid electrical shock hazard, disconnect power cord before
removing covers. Refer servicing to qualied personnel.
CAUTION
Before connecting the line cord to the AC mains, check the rear
panel AC line voltage indicator. Applying a line voltage other
than the indicated voltage can destroy the AC line fuses. For
continued re protection, replace fuses only with those of the
specied voltage and current ratings.
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CAUTION
This product uses components which can be damaged by
electro-static discharge (ESD). To avoid damage, be sure to
follow proper procedures for handling, storing and transporting
parts and subassemblies which contain ESD-sensitive
components.
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 2012/19/EU 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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1 General Information
1.1 Product Overview
The Global Specialties model 1412 is a general purpose triple
range DC power supply. This multi-range switching mode power
supply is like having three power supplies in one. You can set the
current limiting value without any connected load or shorting the
output terminal.
The modular design with additional rear output terminals
and Master & Slave control allow for connecting additional
Slave units. User preset upper voltage limit ensures complete
protection to voltage sensitive loads. Remote sensing and 4-digit
LED meters give precise voltage at the load point.
This power supply is well suited for a wide variety of electrical
and electronics applications in service shops, engineering labs,
production facilities, school laboratories, and home use.
Features:
z80 W
zThree selectable ranges: 0-16 V/5 A, 0-27 V/3 A,
0-36V/2.2 A
zRemote sensing for accurate applied voltage at load
point
zCompact, lightweight, and slim tower housing for limited
bench space
zConstant voltage (CV) and constant current (CC)
operation
z4-Digit LED displays
zFront/Rear output terminals
1.2 Package Contents
Please inspect the instrument mechanically and electrically
upon receiving it. Unpack all items from the shipping carton,
and check for any obvious signs of physical damage that may
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have occurred during transportation. Report any damage to the
shipping agent immediately. Save the original packing carton for
possible future reshipment.
The 1412 power supply is shipped with the following contents:
z1412 Power Supply
zUser manual
zOutput cable
zAC power cord
zSmall screw driver
1.3 Front Panel Overview
Figure 1.3-1 Front Panel
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Front Panel Controls and Indicators
1. Power On/Off Switch
2. 4 mm Safety Banana Jack Output Terminals
3. UVL (Upper Voltage Limit) Adjustment Screw
4. Current Adjustment
5. Voltage Adjustment
6. UVL Button
7. Review Button
8. Range Selectors
9. Output On/Off Button
LED Panel
10. UVL Indicator
11. Constant Voltage Indicator
12. Constant Current Indicator
13. Overvoltage or Temperature Alarm
14. Slave Indicator
15. LED Current Display
16. LED Voltage Display
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1.4 Rear Panel
Figure 1.4-1 Rear Panel
Rear Panel Connectors and Switch
17. Master/Slave Switch
18. Master/Slave Control Terminals
19. Remote Sensing Terminals
20. Rear Output Terminals
21. AC Power Socket
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2 Operating the 1412 Power Supply
1.1 Plugging in the Unit
The Global Specialties 1412 automatically senses standard
power line voltages. There are no switches to set or fuses to
change.
1.2 Stand Alone Operation
zSet the Master/Slave switch on the back of the unit to the
Master position
zSwitch on the power supply without any load attached by
pushing the Power button. The LED display should light.
There should not be any reading on the voltmeter and
the ammeter.
zPress the Output On/Off button and its green LED will
light up. The voltmeter should now show the previously
set output voltage. Use the voltage control knob to adjust
the voltage to the desired level.
zUse the Output On/Off button to turn off the output.
NOTE
The output will automatically shut off when one of
the other voltage/current range selection buttons is
pushed. This is to prevent damage to a connected
load if the voltage/current values are set too high.
zPress and Hold the Review button to display the
previously set voltage and current limiting values. With
this button held down, you can set the current limiting
value without connecting to a load or shorting the output
terminals. Note: The Output button must be in the OFF
position.
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NOTE
Front and rear output terminals are connected
together internally.
1.3 Setting the Current Limiting Value
You can set the current limiting value without connecting to the
load or shorting the output terminal. Press and hold the Review
button and turn the Current Adjustment to your desired value.
1.4 Setting the Upper Voltage Limit (UVL) value
The UVL is an added protection for voltage sensitive loads. When
the output voltage exceeds the UVL, the output terminal will be
turned off automatically and the Alarm LED will light. Only one
UVL limit may be set for all three ranges.
1. Press the UVL Button to enter UVL mode. The UVL
indicator will light. Insert a small screwdriver into the
UVL Adjustment Screw.
2. 2. Turn clockwise to increase the voltage limit and
counter-clockwise to decrease the UVL value.
1.5 Master & Slave Operation
Two or more units of the 1412 can be connected in parallel
to increase output current to the sum of the connected power
supplies. In this mode of operation, the designated Master power
supply will control all the settings in voltage and current of the
Slave power supplies.
1. Set all of the power supplies to the same upper voltage
limit (UVL) and voltage/current range.
2. Set the voltage and current limit of all of the slaves to
maximum values.
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