B&K Precision 1550 - Manual - Manual (Page 5)

O P E R A T I O N S
Ground Connection
Depending on the application, the power supply output terminals can be grounded in any one of
the following grounding conditions:
Negative ground – black (-) negative terminal is shorted with green GND terminal.
Positive ground – red (+) positive terminal is shorted with green GND terminal.
Floating ground – green terminal is not shorted with any of the output terminals.
Remarks:
When operating this power supply as a floating ground, high impedance leakage can exist
between the power supply circuitry and the chassis ground.
Basic Mode of Operation
This power supply is designed to operate as a constant voltage source or as a constant current
source. Automatic crossover to either mode of operation occurs when the load condition changes
as following:
Voltage value setting: at first, you must press the (4) keypad, then you can adjust the voltage
value to your desired value by (6) and (7) keypad.
Current value setting: at first, you must press the (5) keypad, then you can adjust the current
value to your desired value by (6) and (7) keypad.
Constant Voltage (CV), Automatic crossover & Constant Current (CC)
The power supply functions as a constant voltage source (CV) as long as the load current is less
than the preset current limiting value. When the load current is equal to or greater than the preset
current limiting value, the power supply will automatically cross over to the constant current
mode, voltage will drop, (CC) will show on the LCD display panel and it will operate as a constant
current source.
When the load current drops below the preset current limiting value, the supply returns to
constant voltage (CV) mode.
Presetting Current Limiting Value (CC)
Switch on the power supply, adjust the output voltage to about 3V, turn off the output terminal
with push button (8) , icon becomes .
Short the black and red output terminals and turn on the output terminal by (8) , icon becomes
, adjust the current limiting value to your desired value say x Amp by (6) and (7)
keypad. Turn off the output terminal and take out the shorting connection.
The current limiting of power supply has been preset to x Amp for the whole range of output
voltage.
Connection and Operation Procedure
1. After checking with the rating label plug in to AC mains.
2. Switch on the power supply and the LCD display should be on at the same time.
3. The (CV) icon should be shown on the display.
4. Set the current value to maximum by press (6) keypad if you do not require lower Current
limiting value, otherwise do the preset the (CC) limiting procedure.
5. Set your desired output voltage and then turn off the output terminal by push button (8) .
6. Connect to your load positive to positive and negative to negative.
7. Turn on the output terminal again and check if display shows (CV).
8. If display shows (CC), either your preset current limiting value is too low or your load requires
more voltage and current. You need to re-access the voltage and current requirement of your
load and increase the voltage or current accordingly until (CV) appears.