Longwei Electric LW Series User manual

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Thank you for purchasing use hard switching power supply series
products. In order to make you better use this product, please read the
instructions carefully before use, and properly kept.
一、Summarize
LW series power supply for high efficiency switching power supply, it
has the load capability is strong, continuous working failure rate is low,
and had a warm, overload, current limiting and various protective
functions. Can be regulated power supply using also can be used for
current, voltage regulator, steady flow can be automatic conversion. Is a
research, colleges and universities, the factory products such as the
preferred power. Specific model parameters are shown in table 1.
LW Series switching power supply
Model Output Voltage Output Current Display Display Accuracy
LW-K1510D 0-15V 0-10A LED Digit Display ±1%±1
LW-K303D
0-30V
0-3A
LED Digit Display
±1%±1
LW-K305D 0-30V 0-5A LED Digit Display ±1%±1
LW-K3010D 0-30V 0-10A LED Digit Display ±1%±1
LW-K602D 0-60V 0-2A LED Digit Display ±1%±1
LW-K603D 0-60V 0-3A LED Digit Display ±1%±1
LW-K605D
0-30V
0-5A
LED Digit Display
±1%±1
LW-K1002D 0-100V 0-2A LED Digit Display ±1%±1
LW-K1003D 0-100V 0-3A LED Digit Display ±1%±1
LW-K1502D 0-150V 0-2A LED Digit Display ±1%±1

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二、Panel features and specification
2-1Panel features
(1)Voltage display (2)Current display (3)Voltage indicator
(4)Voltage settings (5)Current indicator (6)Current setting (7)Power
switch (8)The positive output (9)Earth output (10)Negative output
2-2 Nominal working conditions
1.input voltage：AC220V±10% 50Hz（AC110V，60HZcan be customized）
2.work environment：temperature：-10℃-40℃ relative humidity：<80%
3.Storage Conditions：temperature：-20℃-80℃ relative humidity：<70%
2-3The power output parameters
Output parameters

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Model
Voltage stability
current stability
Load regulation Ripple And Noise
LW Series ≤0.2% ≤0.8% ≤0.2% ≤0.1%
三、Instructions
3-1 Preparation prior to power：
（1）Confirm that the input voltage in the range of nominal (AC198-242
v, 50 hz). AC110V 60 hz input there will be a special label to facilitate
heat dissipation。
（2）power supply should have at least 10 cm above the heat
dissipation space around, working environment temperature is not
higher than 40 ℃, humidity < 80%, cannot be used in acid gas, where
excessive amounts of dust. To prevent the rain, sun, violent vibration.
3-2 Operational approach：
（1）operational approach
（2）Puts the power "ON" position, indicating lights, LED display.
（3）Voltage Settings: 6 to adjust the steady flow knob clockwise, the
largest 4 to the required voltage regulating voltage regulator knob,
connects the load to the output very eight straight, the negative 10 (pay
attention to the positive and negative polarity correctly), the voltage
indicator lights up 3. Work in the stabilized state power, i.e., constant
voltage, the current changes overload.
（4）Steady flow Settings: regulating voltage setting knob 4 make the
output voltage of 3-5 v arbitrary value, then 6 set steady flow knob
counterclockwise to the minimum. With wire short circuit output positive

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8, 10, the cathode adjustment needed for steady flow setting knob 6 to
current value, and then the demolition of short circuit conductor. Adjust
the voltage to the desired voltage value, connects the load to the output
very eight straight, the negative 10 (pay attention to the positive and
negative polarity correctly), can be normal use, steady flow indicator
lights up 5 at this time. Work in steady flow state power, i.e., constant
current, voltage changes overload.
（5）Note: please do not load to start the power switch, otherwise easy
to damage the power supply box of load. Connect the load to the output
terminals "+" "-", pay attention to the positive and negative polarity is
correct. When requiring higher ripple coefficient, please ensure that the
"+" "-" output terminals must have a reliable grounding "GND", in order
to reduce the ripple
四、Maintain
4-1 Insurance tube replacement
If there are any insurance tube burn out, you must find out the reason,
the native of insurance available capacity of the same failure tube
replaced.
4-2 Maintain
The power supply before delivery by the precision calibration,
non-professional workers do not open the without authorization. If you
have internal damage, please contact with dealers, high pressure
machine, please do not repair yourself.