VOLTEQ HY1550EX User manual
REGULATED DC POWER SUPPLY
USER MANUAL
SINGLE OUTPUT SWITCH MODE DC POWER SUPPLY
Please read this manual carefully before operating the power supply.
1. Introduction
Volteq HY series single output switch mode DC power supplies are regulated variable DC power supplies
designed to provide the most often required DC outputs in scientific and research institutions, schools and colleges,
industrial R&D, as well as manufacturing and testing.
The output voltage is continuously adjustable between 0 and the rated voltage by means of the coarse and fine
potentiometers; the output current is continuously adjustable between 0 and the rated current by means of a current
adjustment knob. Both outputs are accurately displayed on the digital voltmeter and ammeter.
The DC power supplies in this series have high efficiency, superior load and line regulation, and low ripple noise.
These power supplies have high level of protection including over voltage, over temperature, and over load protection.
They can act as constant voltage as well as constant current sources. Because of the excellent protection, these power
supplies are widely used for electroplating, anodizing, electroforming, electro-winning, battery charging and
equalizing, and other applications requiring excellent reliability and robustness.
2. Specifications
2-1 General
AC Input 110V/220V, 110V, or 220V ±10%, 50/60 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%
Table 2-1
Model Max. Voltage
Max. Current
Fuse Type and
Rating
Input AC
50/60Hz
Weight (lbs)
HY1550EX 15V 50A 15A/250V 110V/220V 15
HY15150EX 15V 150A air switch 110V or 220V 23
HY3050EX 30V 50A air switch 110V/220V 16
HY3080EX 30V 80A air switch 110V or 220V 21
HY30100EX 30V 100A air switch 110V or 220V 23
HY5030EX 50V 30A air switch 110V/220V 16
HY5050EX 50V 50A air switch 110V or 220V 21
HY7520EX 75V 20A air switch 110V/220V 17
HY7530EX 75V 30A air switch 110V or 220V 20
HY10010EX 100V 10A 15A/250V 110V/220V 15
HY10020EX 100V 20A air switch 110V or 220V 21
HY12010EX 120V 10A 15A/250V 110V/220V 15
HY12020EX 120V 20A air switch 110V or 220V 21
HY20010EX 200V 10A air switch 110V or 220V 21
HY30005EX 300V 5A air switch 110V/220V 17
HY15020EX 150V 20A air switch 110V or 220V 23
2-2 Front Panel Descriptions
(1) Trademark and Model #: shows Volteq as trademark and the actual model number of the power supply.
(2) Digital ammeter: displays the actual output always; this equates to the set value if in CC mode.
(3) Digital voltmeter: Displays the actual output voltage always; this equates to the set value when in CV mode.
(4) Current knob (Fine): for fine adjustment of current limit.
(5) Current knob (Coarse): for coarse adjustment of current limit.
(6) Voltage Adjustment (Fine): for the fine adjustment of the voltage limit.
(7) Voltage Adjustment (Coarse): for the coarse adjustment of the voltage limit.
(8) OV Adjustment: for setting the OV (over-voltage) level (See 3-5) with a flat head screwdriver (not included).
(9) CC indicator light: this indicator turns red when the power supply is in constant current (CC) mode (See 3-2).
(10) OV indicator: this indicator turns red when the power supply is over-voltage protected. The power supply will not
respond to user control until it's reset (See 4-2 for more details).
(11) Over-temperature (OT) indicator: this indicator turns red when the internal temperature of the power supply is too
high, and the power supply output is disabled. See 4-3 for more details.
(12) CV indicator: this indicator light turns red when the power supply is in constant voltage (CV) mode (See 3-2).
(13) On/Off Power button: When this button is pushed to "In" position, the power supply is turned on; conversely, the
power supply is off when this button is in the "Out" position.
Note: For models with air switch, this button enables/disables the output. Turn the air switch on first before
turning this button on; conversely, turn this button off before switching off the air switch in the back. For
the models without air switch, this button turns the power on and off.
(14) Front output terminals: from left to right, labeled as negative, ground ("GND"), and positive. The output is
between the + and - terminals, while the ground terminal is for grounding the case only. To reduce the ripple, the
negative output terminal ("-") is usually shorted with “GND”. Only select models include the front terminals.
Warning: the front terminals are rated for less than 10A only. Use only the rear output terminals if output
current is more than 10A, and tighten the connection to reduce contact resistance.
Warning: For electrochemical applications (e.g., plating and anodizing), remove the short connector between
“–” and ground terminals.
2-3 Back Panel Descriptions
(16) Positive Terminal.
(17) Negative Terminal.
(18) Ground Terminal: this is connected to the case.
(19) Cooling fan: the fan is turned on briefly when the power supply is energized; afterwards it is turned on when
internal temperature of the power supply rises above 45℃.
(20) AC voltage selector switch: use this switch to select the input AC of either 110V or 220V for select models.
(21) Air Switch: the resettable air switch is available for select models only.
(22) AC Input. For power supply models not equipped with air switch, the fuse is located here. To replace the fuse,
remove the AC power cord, and use a flat head screwdriver to remove the fuse holder.
Warning: To avoid electrical shock, the power plug ground pin must be connected to AC ground.
Warning: the voltage indicated on the power supply 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.
2-3 Technical Parameters
1) Voltage stabilization: ≤0.2%
2) Current stabilization: ≤0.5%
3) Load stabilization: ≤0.3%
4) Ripple and noise: ≤1%( RMS)
5) Display accuracy: ±1%±1 digit
3. Operation Instructions
3-1 Installation
1) Before plugging into AC outlet
The input voltage of the power supply is typically shown on the top rear part of the case. AC voltage should be within
10% of the input voltage specified, e.g., if the specified input voltage is 110V, the power supply will work with AC
voltage of 110V±10%.
Warning: The voltage indicated on the power supply (look for a sticker on the case close to the rear) must
match the AC voltage, otherwise the power supply will be damaged (plugging a power supply rated for
110V into 220V AC; such damages are not under warranty), or the maximum output will not be reached
(plugging a 220V power supply into 110V AC). If the power supply is equipped with an AC voltage
selector switch in the back, the selector switch must show the correct value in the middle, e.g. for 120V
AC, the switch itself should show 110V in the voltage selector switch as shown in picture below:
Warning: Changing the AC voltage selector setting must be done with the power supply unplugged from AC.
Warning: To avoid electrical shock, the power cord ground conductor must be connected to AC ground.
Warning: Do not connect a load to the power supply before it's turned on. Likewise, disconnect the load before
shutting down the power supply. 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 connecting the load, change the voltage/current slowly, and NEVER turn the
power supply on or off 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. The cooling fan is controlled by thermistor and will turn on automatically when the temperature of the
heat sink is above 45°C. The power supply comes with over-temperature (OT) protection, and will disable itself when
the inside temperature of the device is too high. The power supply resets itself once the temperature falls below the
40°C. To ensure proper operation, make sure the ambient temperature is below 40°C and there is sufficient ventilation.
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 9 is red; it’s in CV mode if indicator light 12 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 4 and 5) is higher than the
voltage limit (set by knobs 6 and 7) 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.
This manual suits for next models
15
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