Model 1900B, 1901B, 1902B Switching DC Power Supply INSTRUCTION MANUAL
1 Safety Summary The following safety precautions apply to both operating and maintenance personnel and must be observed during all phases of operation, service, and repair of this instrument. Before applying power, follow the installation instructions and become familiar with the operating instructions for this instrument. GROUND THE INSTRUMENT To minimize shock hazard, the instrument chassis and cabinet must be connected to an electrical ground.
WARNINGS AND CAUTIONS WARNING and CAUTION statements, such as the following examples, denote a hazard and appear throughout this manual. Follow all instructions contained in these statements. A WARNING statement calls attention to an operating procedure, practice, or condition, which, if not followed correctly, could result in injury or death to personnel.
Compliance Statements Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European countries with separate collection systems) This product is subject to Directive 2002/96/EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment (WEEE), and in jurisdictions adopting that Directive, is marked as being put on the market after August 13, 2005, and should not be disposed of as unsorted municipal waste.
Contents 1 Safety Summary ........................................................................................ 1 2 Introduction .............................................................................................. 6 3 Controls and Indicators ............................................................................. 7 4 3.1 Front Panel ........................................................................................ 7 3.2 Rear Panel ...........................................
4.3.2 5 Disconnection.......................................................................... 19 Remote Control....................................................................................... 19 5.1 5.1.1 Remote Control Connector Setup ........................................... 20 5.1.2 Using Two External Variable DC Voltage Sources ................... 21 5.1.3 Using Two 5 kΩ Variable Resistors .......................................... 23 5.1.4 Enable and Disable the Output ............
2 Introduction B&K Precision models 1900B, 1901B, and 1902B are laboratory grade switching mode DC power supplies with high current output in a small form factor and lightweight package. The 1900B Series provide different configurations of high output voltage or high output current and make setting voltage and current levels fast and precise through its dual action, course/fine rotary encoder control.
3 Controls and Indicators 3.1 Front Panel Figure 1 - Front Panel (1) LED panel meter display with CV/CC indicator (2) Rear Control Indicator (lights up when using Preset/Remote Control/Set mode) (3) Output Voltage Control Knob (control main and auxiliary output voltage) (4) Output Current Control Knob (control main and auxiliary output current limit) (5) Power ON/OFF Switch (6) Auxiliary Output Terminal (max 5 A) Note: Please see Section 4.1.
3.2 Rear Panel Figure 2 - Rear Panel (7) Main Output Terminal (max 60 A for 1900B / 30 A for 1901B / 15 A for 1902B) Note: Please see Section 4.1.5 for more details on using both main and auxiliary output terminals together.
4 Operating Instructions Safety Precautions ● Never short the remote sense terminal. ● This power supply is for indoor use only. ● Do not expose the power supply to sun, high humidity, or dusty environments. ● Never remove the metal cover of the power supply while AC power is connected. ● Never touch the unit when your hands are wet. ● Never block the ventilation slots and cooling fan air intake window. ● Never attempt to repair the power supply.
4.1 Using the Power Supply 4.1.1 Connection To connect the equipment to the power supply, follow the steps below. 1. Check the rating label of the power supply and confirm that it complies with your AC mains voltage. 2. Connect the power supply to the AC mains using the provided power cord and make sure the Mode Selection Switch is in the Normal position. 3.
Front Panel Display Test Segment check Constant Voltage mode indicator check Constant Current mode indicator check Rear control indicator check Return to Constant Voltage mode Start power supply checks Overvoltage protection check Overload protection check 11
Front Panel Display Test Overtemperature protection check Fan check Output off (remote control mode) Table 2 - Self Test Sequence The LED and other indicators on the front panel will be turned on. When the cooling fan is being checked, a loud fan noise can be heard. After the self checks, the CV, V, and A LED indicators are lit up displaying voltage and 0.0 current. To find out about the set CC current level, just turn the current control knob one click in either direction.
4.1.4 Manually Zeroing Current Meter Offset The power supply will automatically zero the current meter offset when powered up. In case it is needed to reset the current meter to zero during a test, you can manually reset it to zero. This function can be used to zero meter readings < 1 A. 1. Press and hold the Voltage Control Knob for 30 s to enter Menu mode. 2. Rotate the Current Control Knob until the current meter displays “YES”. 3. Then press the Current Control Knob once to confirm.
4.1.5 Using Both Main and Auxiliary Outputs The power supply has a main output in the rear and an auxiliary output in the front that can be used separately or together. The main and auxiliary output both share the same voltage and current control knobs and will output the same voltage and current up to the maximum output ratings of the power supply and terminals.
To select a mode, slide the Mode Selection Switch on the rear of the unit. Figure 3 – Mode Selection Switch Note: The power supply is factory preset to Normal Mode with maximum current level. 4.2.1 Normal Mode This is the factory preset mode and the power supply output voltage and current are controlled by the dual action dial knobs. Push the knobs to toggle the coarse and fine tuning. You will notice the subtle change in brightness of LED.
The user can also set their own output voltage and current using Set Mode. Please refer to Section 4.2.4 for details. Recall No. Output Voltage Output Current P1 5V Maximum P2 13.8 V Maximum P3 Model 1900B: 15 V Model 1901B: 25 V Model 1902B: 55 V Maximum Table 3 - Default Presets 4.2.3 Analog Remote Control Mode Select this mode to control the output voltage and current via remote control connector. Please refer to Section 5.1 for more details. 4.2.
To reset presets to factory settings 1. Press and hold the Voltage Control Knob for 30s to enter Menu mode. 2. When it is showing “CCO”, rotate the Voltage Control Knob until voltage meter shows “rPr”. 3. Then rotate the Current Control Knob until the current meter shows “YES”. 4. Press the Current Control Knob once to confirm. The “YES” will light up after successfully resetting presets to factory default values.
5. Finally, press the Voltage Control Knob to exit. Note: 4.3 All the set values in the presets will be saved even after the power supply has been turned off. Always check output voltage of Presets before connecting to load. To check the preset values, move Mode Selection Switch to “Preset” position. Move the Recall Switch to P1, P2, or P3. The voltage and current settings of corresponding presets P1, P2, or P3 will be shown on the panel meters.
Figure 3 shows typical connection between power supply and device for remote sense operation. Figure 3 - Remote Sense Connection The remote sense wire gauge should be at least 22AWG. 4.3.2 Disconnection WARNING: Wrong disconnect sequence will damage the power supply. 1. Disconnect the remote sense connections. 2. Disconnect the power connections between the power supply and equipment. 5 Remote Control There are two methods to remotely control voltage and current.
5.1 Analog Remote Control 5.1.1 Remote Control Connector Setup Set up the provided remote connector plug. (a) Remove the black portion of the remote control connector plug by removing the screw as shown in Figure 4. Figure 4 - Remote Control Connector (b) Solder 5 wires (22AWG) to pins 1, 2, 3, 4, and 5 of pin plug. Refer to Figure 5 for pin numbers. Figure 5 - Pin Numbers (c) Make sure the load is disconnected and the power supply is OFF.
(d) Plug the remote connector plug into the analog remote control terminal of the power supply. (e) Secure the remote connector plug to the terminal socket by locking the connector ring (Figure 6). Figure 6 - Connector Ring Then you can choose one of the following two methods to use the analog remote control feature. 5.1.
6 N/A 7 N/A 8 N/A Table 4 – Remote Connector Plug Pin Assignment for External Variable Voltage Sources A variable external DC voltage source of 0 – 5 V is fed into the analog remote control terminal to adjust the output voltage level of both Main and Auxiliary output. WARNING: Do not input higher than 5 V, otherwise the overvoltage protection (OVP) will be triggered. 1. Make sure the load is disconnected and the power supply is OFF. 2.
5.1.3 Using Two 5 kΩ Variable Resistors 1. Make sure the load is disconnected and the power supply is OFF. 2. Prepare two 5 kΩ variable resistors and connect wires from pins 1, 2, 3, and 4 as shown in Figure 7.
5 Output OFF 6 N/A 7 N/A 8 N/A Short to Ground Table 5 – Remote Connector Plug Pin Assignment for Variable Resistors 3. Turn the remote control ON/OFF switch to ON position. 4. Switch on the power supply. 5. Check the output voltage range of the power supply by varying the 5 kΩ variable resistor for voltage adjustment. 6. Short circuit the main output with 12AWG wire and check the display for CC setting by varying the 5 kΩ variable resistor for current adjustment. 7. Switch off the power supply.
5.2 PC Interface Control The power supply provides a USB interface for remote control via PC. Please see programming manual for more information on the PC interface control setup, software, and remote commands. The software and programming manual can be downloaded from B&K Precision’s website at www.bkprecision.com. Note: The power supply must be in Normal Mode and operated as a standalone equipment (not connected in series or parallel with multiple supplies) for PC interface control.
6 Faults and Troubleshooting 6.1 OVP: Overvoltage Protection This unit has a built-in tracking overvoltage protection feature. In the event of the output voltage becoming greater than the set value (see specified range from Specifications section), protection will be triggered and the output power will be cut off. OVP warning will appear as shown below. Figure 8 - Overvoltage Protection To reset the warning, switch off the unit and remove all connected devices.
Figure 9 - Overtemperature Protection When you get this warning, switch off the unit and remove all loading. Check your load and output settings and allow the unit to cool down for at least 30 minutes. Check if any of the ventilation is blocked and make sure there is enough clearance around the power supply. Listen carefully for the fan noise from the cooling fan when you turn on the unit again.
Figure 10 - Overload Protection To reset this warning, switch off the unit and remove all connected devices. Switch the unit back on again and double check with caution. If the problem persists, please contact B&K Precision. 6.4 Upper Voltage Limit (UVL) and Upper Current Limit (UCL) The power supply has upper voltage and upper current limit settings to prevent accidental changes to the output settings. These values can only be set through PC software.
If current is set beyond the power supply’s upper current limit when increasing the output current setting, the current display will show the following: Figure 12 – Upper Current Limit 6.5 Fuse Replacement If the fuse blows, the CV or CC indicators will not light and the power supply will not operate. The fuse should not normally open unless a problem has developed in the unit. Try to determine and correct the cause of the blown fuse, then replace only with a fuse of the correct rating as listed below.
7 Specifications Models 1900B 1901B 1902B Variable Output Voltage 1 – 16 V 1 – 32 V 1 – 60 V Variable Output Current 0 – 60 A 0 – 30 A 0 – 15 A Output Auxiliary Output Current 5A Voltage Regulation Load (0-100% Load) ≤ 50 mV Line (90-132 VAC, 170-264 VAC Variation) ≤ 20 mV Current Regulation Load (10-90% Rated Voltage) ≤ 200 mA Line (90-132 VAC, 170-264 VAC Variation) ≤ 150 mA ≤ 100 mA ≤ 50 mA Ripple & Noise Ripple & Noise Voltage (rms) ≤ 5 mV Ripple & Noise Voltage (peak-peak)
Models 1900B 1901B 1902B 84% (110 VAC) 85% (230 VAC) 87% (110 VAC) 86% (230 VAC) 87% (110 VAC) 88% (230 VAC) Switching Frequency 65 – 85 kHz 75 – 95 kHz 65 – 85 kHz Tracking Overvoltage Protections O/P 1-5 V: set voltage +2 V O/P 5-16 V: set voltage +3 V O/P 1-5 V: set voltage +2 V O/P 5-20 V: set voltage +3 V O/P 20-32 V: set voltage +4 V O/P 1-5 V: set voltage +2 V O/P 5-20 V: set voltage +3 V O/P 20-60 V: set voltage +4 V Efficiency Transient Response Time (50-100% Load) 1.
8 Certification CE Declaration of Conformity The power supply meets the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC Electromagnetic Compatibility Directive.
9 Service Information Warranty Service: Please go to the support and service section on our website at www.bkprecision.com to obtain an RMA #. Return the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors, and accessories that you are using with the device. Non-Warranty Service: Please go to the support and service section on our website at www.bkprecision.com to obtain an RMA #.
10 Limited Two-Year Warranty B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof will be free from defects in workmanship and materials, for a period of two years from date of purchase. B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts. Returned product must be accompanied by proof of the purchase date in the form of a sales receipt.
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