4
2. Operation
2.1 Controls and display:
(1) LED display with voltage value
(2) LED display with current value
(3) Indicator / Symbol of constant voltage
(4) Indicator / Symbols of constant current
(5) Rotary switch for adjusting the output voltage: coarse
(6) Rotary switch for adjusting the output voltage: fine
(7) Rotary switch for limiting the output current: coarse
(8) Rotary switch for limiting the output current: fine
(9) USB output jack: 5V/2A
(10) Output terminal positive (+) red
(11) Ground terminal ( ) green
(12) Output terminal negative (-) black
(13) On / Off switch
(14) AC input socket with fuse
(15) Concealed fuse box
2.2 Operation: Functions
2.2.1 Constant Voltage (CV),Automatic Frequency & Constant Current (CC)
The power supply operates as a constant voltage source as long as the load current is lower than the
preselected current limit. If the load current is equal to or higher than the preselected limit, the power
supply enters the constant current mode. As a result, the voltage decreases, the constant current
symbol (CC) is shown in the LED display and the device operates as a constant current source. As
soon as the load current falls below the previously selected limit value again, the device switches back
to constant voltage mode.
2.2.2 Setting the current limit value (protection value)
Turn on the device, turn the switches (7 and 8) counterclockwise until you reach the minimum value, turn
switch 5 clockwise to the appropriate value, and then short-circuit the output terminals (10 and 12). Then
turn the rotary switches (7 and 8) clockwise to the appropriate value so that the output current is equal to
the required current limit (protection value). When this is done, the limit value (protection value) is set.
Now remove the short-circuit connection. The current limit value of the power supply is now set to "X"
amperes for the entire output voltage range.
2.2.3 Connection establishment and operation
2.2.3.1.Plug the power cord of the device into an AC outlet (check rating).
2.2.3.2.Turn on the device; the LED display should turn on at the same time.
2.2.3.3 The constant voltage (CV) symbol should be shown in the display.
2.2.3.4.Turn the output current setting switch (7) clockwise to the maximum value unless you need a
lower output current limit. If you do need a lower limit, set it using the steps in 2.2.2.
2.2.3.5.Set the desired output voltage range.
2.2.3.6.Connect the device to the load (which is to be supplied with current and voltage) by connecting the
positive poles and the negative poles (positive to positive; negative to negative).
2.2.3.7.Make sure that the constant voltage (CV) symbol is shown in the display.
2.2.3.8.If the constant current (CC) icon appears on the display, either your previously selected current
limit is too low or your load requires a higher voltage and current. In this case, you must re-evaluate the
voltage and current requirements of your load and adjust the output voltage and current accordingly until
the constant voltage (CV) icon reappears.
2.2.4 Overvoltage protection
This function is intended to protect the connected load, in case of malfunction of the output voltage
control circuit. The maximum output voltage cannot exceed 30% of the voltage set during operation.
