Mastech HY1503D Manual de usuario
LINEAR DC POWER SUPPLY
USER MANUAL
REGULATED LINEAR DC POWER SUPPLY
Please read this manual carefully before operating the power supply.
1. Introduction
The variable DC power supplies covered in this manual are regulated linear DC power supplies designed for laboratory,
school and manufacturing applications. The output voltage and current can both be continuously adjusted from 0 to
maximum rated value by means of the coarse and fine potentiometers. As linear power supplies, they have excellent ripple
and load regulation, and are suitable for general electronic design work. These power supplies can be used as constant voltage
source or constant current source. All of the models come with over-voltage, so you can also use them for electroplating,
anodizing, battery charging, and DC motor testing, etc.
2. Specifications
2-1 General
AC Input： 110V/220V±10% , 47-63 Hz
Rating: See Table 2-1
Operating environment: Indoor use with dry and dust free air for cooling
Altitude up to 2000 m
Temperature: -10°C to 40°C
Relative humidity: <80%
Storage environment: Temperature:-100C to 700C
Relative humidity: <70%
Table 2-1
Model Max. Voltage Max. Current Fuse Rating Dimension (mm)
HY1503D 15V 3A 5A/250V 270×128×145
HY1803D 20V 3A 5A/250V 270×128×145
GPS-1850D 20V 5A 5A/250V 270×128×145
HY3003D* 30V 3A 5A/250V 270×128×145
HY3005D* 30V 5A 5A/250V 270×128×145
HY3006D 30V 6A 5A/250V 270×128×145
HY6003D 60V 3A 5A/250V 270×128×145
HY3003DX 30V 3A 5A/250V 270×128×145
HY3005DX 30V 5A 5A/250V 270×128×145
HY5003D 50V 3A 5A/250V 270×128×145
HY5005D 50V 5A 5A/250V 270×128×145
*GPS-3050D and HY3005D are identical, while HY3003D and GPS-3030D are identical.
2-2 Front Panel Descriptions
(1) Digital ammeter: displays the actual output; this equates to the set value if in CC mode.
(2) Digital voltmeter: Displays the actual output voltage; this equates to the set value when in CV mode.
(3) Current calibration: Use this screw to calibrate the current
meter if necessary.
(4) Voltage calibration: Use this screw to calibrate the voltage
meter if necessary.
(5) Current fine: for fine adjustment of the current limit.
(6) Current coarse: for coarse adjustment of the current limit.
(7) Voltage fine: for fine adjustment of the voltage limit.
(8) Voltage coarse: for coarse adjustment of the voltage limit.
(9) Output button: When this button is pushed to ‘In’ position,
the power supply output is enabled, and the output is
connected to the terminals (marked as OUT); conversely,
the power supply output is stopped when this button is in
the ‘Out’ position (marked as STOP). Note: the marking
is slightly confusing - STOP means output is disabled,
and OUT means output is turned on.
(10) CC indicator: this indicator turns red when the power supply is in constant current (CC) mode (See 3-2).
(11) CV indicator: this indicator turns red when the power
supply is in constant voltage (CV) mode (See 3-2).
(12) Power button: When this button is pushed to "In"
position, the power supply is turned on, and the display
comes on; conversely, the power supply is off when
this button is in the "Out" position.
(13) “-” Output terminal: Negative polarity (black).
(14) “GND” terminal: Ground terminal (green). The GND
terminal is connected to case and AC ground.
(15) “+” Output terminal: Positive polarity (red).
Warning: For electrochemical applications (e.g.,
plating and anodizing), remove the short
connector between “–” and ground
terminals.
2-2 Back panel
(16) Cooling fan: the fan turns on as long as the power supply is on.
(17) AC voltage selector switch: use this switch to select the input AC of either 110V or 220V. Default is set at 110V.
Warning: the voltage indicated on the AC selector switch must match the AC voltage, otherwise the power
supply will be damaged (plugging a power supply rated for 110V into 220V AC), or the maximum
output would not be reached (plugging a 220V power supply into 110V AC). Damage caused by
plugging into wrong AC voltage is not under warranty.
(18) AC Input. The fuse is located here. To replace the fuse, remove the AC power cord, and use a flat head
screwdriver to pop out the fuse holder.
2-3 Technical Parameters
1) CV mode:
Line regulation: <0.01%+3mV
Load regulation: < 0.01%+3mV (Max. current<3A)
Load regulation: < 0.01%+5mV (Max. current>3A)
Ripple & noise : < 0.5mVrms (5Hz-1MHz) (Max. current <3A)
<1.0mVrms (5Hz-1MHz) (Max. current >3A)
Recovery time : < 100μS (load-variant 50%, min. load current 0.5A)
Temperature coefficient: < 300PPM/0C
2) CC Mode:
Line regulation: <0.2%+3mA
Load regulation: < 0.2%+3mA
Ripple & noise : < 3mArms
3) Display accuracy: ±1%±1 digit
3. Operation Instructions
3-1 Installation
1) Before plugging into AC outlet
Warning: The correct input voltage of the power supply is shown on the AC selector switch, e.g. for 120V
AC, the switch itself should show 110V on the voltage selector switch as shown in picture below:
The AC voltage should be within 10% of that, e.g., if the specified input voltage is 110V, the power
supply will work with AC voltage of 110V±10%.
Warning: Changing the AC voltage selector setting must be done with the power supply unplugged.
Warning: To avoid electrical shock, the power cord ground conductor must be connected to AC ground.
Warning: Make sure the output is stopped before turning the power supply on or off. Shutting down
improperly can cause the power supply to fail when it’s turned on next time. Damages due to improper
startup and/or shutdown are not under warranty.
Warning: When running an inductive load like magnetic coils, DC motors, stepper motors, etc., make sure to
set the output to zero before turning on the output; once output is on, change the voltage/current slowly,
and NEVER turn the power supply output on or off, or worse yet, shutting down or turning on the
power supply with a inductive load connected!
2) Installation: For better heat dissipation, the two sides and back of the power supply should have at least 10cm
space from the walls.
3-2 Constant Voltage / Constant Current Characteristics
The power supply is a regulated constant current / constant voltage (CC CV) power supply, which is characterized by
automatic crossover from constant current (CC) to constant voltage (CV), and vise versa. At any moment, the power
supply automatically determines whether to operate in CV or CC mode, depending on the voltage and current limit
(set by the front knobs), and the load connected (if no load is connected, it simply means that the load resistance is
infinite; conversely, if a short is connected, the load resistance is zero).
Note: The power supply is in CC mode if indicator light 10 is red; it’s in CV mode if indicator light 11 is red.
In order to understand the crossover, it is important to note that the voltage and the current are related by the Ohm’s
law, so only one of the two is an independent variable. The law dictates that the output current I in amps (A) is always
equal to the output voltage V in volts (V) divided by the load resistance R in ohms (Ω):
For example, if the load resistance (R) is such that the current limit (set by knobs 5 and 6) is higher than the voltage
limit (set by knobs 7 and 8) divided by R (i.e., voltage limit is lower than current limit for the load R connected), the
power supply operates in the constant voltage (CV) mode. When in CV mode, the output voltage remains constant
even if the load resistance changes (e.g., if load resistance decreases, the current increases), up to the point when the
preset current limit is reached. The crossover point is reached when the voltage and current limit are reached
simultaneously. Beyond the crossover point, the indicator changes from CV to CC, and the current limit becomes the
lower limit, and the output current remains constant and the output voltage drops in proportion to the further decrease
of the load resistance.
Similarly, crossover from constant current (CC) to constant voltage (CV) mode automatically occurs when the
resistance of the load is increased. A good example of this behavior is charging a 12V lead acid battery. Initially, the
open circuit voltage of the power supply may be set at 13.8V. A discharged battery when connected to the power
supply may demand high charging current beyond the current limit set for the power supply (or the maximum current
capacity of the power supply), and the power supply will operate in constant current mode, with the maximum
charging current equal to the set current limit. As the battery becomes more charged, the voltage will increase, and
eventually reach 13.8V. Beyond that point, the current demand from the battery will drop and fall below the set limit.
The crossover is signaled by the indicator light changing from CC to CV.
3-3 Operating Procedures
Warning: Make sure the output is stopped when connecting or disconnecting a load.
Warning: If load resistance is <1 ohm, make sure the voltage is set to <5V when enabling the output.
a) Make sure that the AC voltage matches the input voltage shown on the AC selector switch.
b) Make sure power button is in OFF position and output is stopped; plug power cord into the AC outlet.
c) Turn the power supply on by pressing the power button to ON position.
d) With no load connected, push the output button in to enable output.
e) Adjust current knobs (knobs 5 or 6) to slightly above minimum position with CV indicator light red. If it’s
necessary to limit the current while in the CV mode, follow section 3-4 to set the current limit.
f) Set voltage (knobs 7 and 8) to the desired voltage. This voltage should be the operating voltage in CV mode;
the maximum voltage in CC mode; or the charging voltage recommended by battery manufacturer if
charging a battery.
g) Stop the output. Connect the external load to the output terminals. Make sure both "+" and "-" terminals are
connected correctly. When connecting a battery to be charged, you must make sure that polarity is correct.
1) Constant Voltage (CV) Operations
Otros manuales para HY1503D
1
Este manual sirve para los siguientes modelos
10
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