Model 1900, 1901, 1902 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 2 3 4 5 6 7 8 9 Safety Summary ........................................................................................ 1 Introduction .............................................................................................. 5 Controls and Indicators ............................................................................. 6 3.1 Front Panel ........................................................................................ 6 3.2 Rear Panel .......................................
2 Introduction B&K Precision models 1900, 1901, and 1902 are laboratory grade switching mode DC power supplies with high current output in a small form factor and lightweight package. The 1900 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 4.1.
3.2 Rear Panel Figure 2 - Rear Panel (7) Main Output Terminal (max 60 A for 1900 / 30 A for 1901 / 15 A for 1902) Note: Please see 4.1.4 Using Both Main and Auxiliary Outputs for more details on using both main and auxiliary output terminals together.
4 Operating Instructions Safety Precautions ● Never short the remote sensing 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 C.V. indicator check C.C. indicator check Rear control indicator check Return to C.V.
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 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.
Note: 4.2.1 The power supply is factory preset to Normal Mode with maximum current level. 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. Adjust the knobs to your desired values through coarse and fine tuning. To check the preset current level, turn the Current Knob lightly in any direction.
4.2.3 Set Mode First, enter Set Mode by pushing Mode Selection Switch to “Set” position. To define the preset output P1/P2/P3 1. Select the Recall Switch to the position you want to set: P1, P2, or P3. 2. Adjust the front panel voltage control knob to set your desired voltage value. 3. Adjust the front panel current control knob to set your desired current limit value. 4. Repeat the procedure for remaining presets P1, P2, or P3 if desired. 5.
4.2.4 Analog Remote Control Mode Select this mode to control the output voltage and current by Remote Control Connector. Please refer to 4.4 Analog Remote Control for more details. 4.3 Remote Sensing (Model 1900 Only) WARNING: Never short the remote sensing terminal. Never connect the remote sensing terminal in reverse polarity. Always disconnect the remote sensing terminal first after use. 4.3.1 Connection 1. Make the power connections between power supply and equipment. 2.
4.3.2 Disconnection WARNING: Wrong disconnect sequence will damage the power supply. 1. Disconnect the remote sensing connections. 2. Disconnect the power connections between the power supply and equipment. 4.4 Analog Remote Control There are two methods to remote control voltage and current. Note: Both methods require the remote control connector plug to be set up in order for analog remote control mode to be functional; otherwise the unit will be in CC mode all the time. 4.4.
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 either method A or B below to use the analog remote control feature.
Method A: Using Two External Variable DC Voltage Sources PIN FUNCTIONS REMARKS 1 Internal DC +5 V Less than 50 mA 2 Voltage Adjust 0–5V 3 Current Adjust 0–5V 4 Ground 5 Output OFF 6 N/A 7 N/A 8 N/A Short to Ground 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.
5. Switch on the power supply. 6. Check the output voltage range of the power supply by varying the external voltage source for voltage adjustment from 0 to 5 V. 7. Short circuit the main output with an 8AWG gauge wire and check the display for CC setting by varying the external voltage source for current adjustment from 0 to 5 V. 8. Switch off the power supply. Method B: Using Two 5 kΩ Variable Resistors 1. Make sure the load is disconnected and the power supply is OFF. 2.
PIN FUNCTIONS REMARKS 1 Internal DC +5 V Resistor end 2 Voltage Adjust Variable part of resistor 3 Current Adjust Variable part of resistor 4 Ground Resistor end 5 Output OFF Short to Ground 6 N/A 7 N/A 8 N/A 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.
Shorting Pin 5 to Pin 4 (ground) will turn the output off. When output is off, the CV and CC LED will flash. The current output voltage and current setting will show on the panel meter. You can also adjust the output by voltage and current control knob to your desired value when output is off. 5 Faults and Troubleshooting 5.1 OVP: Overvoltage Protection This unit has a built-in tracking overvoltage protection feature.
6 S”), 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. Switch the unit back on again and it should resume normal operation. If the problem persists, please contact B&K Precision. 5.2 OTP: Overtemperature Protection There is a thermo sensor inside the unit to monitor and prevent the unit from getting too hot.
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. If you cannot hear this routine self test fan noise upon power on, the fan has failed and the power supply should not be used.
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. The fuse is located on the rear panel (see Figure 2 - Rear Panel). Pull fuse compartment out with a flathead screwdriver and replace fuse in holder.
6 Specifications Models 1900 1901 1902 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 1900 1901 1902 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.
7 Certification CE Compliant CE Declaration of Conformity The power supply meets the requirements of 2006/95/EC Low Voltage Directive and 2004/108/EC Electromagnetic Compatibility Directive. Low Voltage Directive - EN 60950 - EN 61010 o Safety requirements for electrical equipment for measurement, control, and laboratory use. EMC Directive - EN 55011 - EN 55022 o Electrical equipment for measurement, control, and laboratory use.
8 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 #.
9 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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