User Guide Model 382275 and 382276 Single Output Laboratory Grade Switching DC Power Supply
Introduction Congratulations on your purchase of the Extech 382275 (110V) or 382276 (220V) Single Output Laboratory Grade DC Power Supply. The dual action (coarse/fine tune) rotary encoder allows for quick and precise voltage and current level adjustments. Setting, changing, and checking the current limit level can be performed easily without sparking the output poles.
Power Supply Description 2 1 3 4 5 10 6 9 7 8 1. Power Switch ON/OFF 2. Voltage Display 3. Current Display 4. Constant Voltage Indicator LED 5. Rear Control Indicator LED (Switches ON when in Preset, Remote Control or Set Mode) 6. Output Voltage Control Knob (Controls both the main and auxiliary output voltage) 7. Output Current Control Knob (Controls both the main and auxiliary output current) 8. Positive Auxiliary Output Terminal (Max. 5 Amps) 9.
Rear Panel Description 3 2 1 6 4 5 1. Main Output (20 Amps Max.) 2. P1, P2 and P3 Recall Switch 3. Cooling Fan for Ventilation 4. AC input Plug and Fuse 5. Remote Control Connector 6. Mode Switch Mode Descriptions Mode Selection The power supply has four (4) modes of operation: NORMAL, PRESET, SET and REMOTE CONTROL mode. Slide the Mode Selection Switch to the desired Mode. The power supply defaults to the NORMAL Mode. Normal Mode Normal Mode is the factory preset mode.
Preset Mode In the PRESET mode, the Rear Control Light is switched ON to indicate that the panel voltage and current controls are de‐activated. There are three preset outputs, P1, P2 and P3, selectable via the Recall Switch, located on the rear of the power supply. The preset values are factory set per the following table. Presets Output Voltage Output Current P1 5V Maximum P2 13.
Power up Checks 1. First, check the rating label of the power supply and make sure it complies with the AC mains voltage (110V or 220V). Next, set the Mode Switch located on the rear of the power supply to the Normal Position. 2. Listen for the cooling fan when switching on the power supply. The power supply performs a series of self test checks on startup which includes testing the cooling fan. The fan will stop completely after a few seconds after running at high speed indicating that it is in good order.
Operation WARNING: Do not use this power supply with electric motors for any reason or for charging purposes on electroplating equipment or similar devices. Return EMF and voltage transients generated by electric motors can damage this power supply. This power supply was designed for use on electronic equipment only and not intended for use on electrical equipment of any kind. Using the Control Knobs The rotary control knobs offer fine/coarse tuning with notched movement. 1.
Remote Control Remote control is made possible through the use of the supplied 8‐pin Remote Control connector and 22AWG wire. The Remote Control feature offers remote adjustment of voltage and current and output ON/OFF switching. Remote ON‐OFF Control The Remote Control ON‐OFF function can be activated in any of the operational modes (NORMAL, PRESET, REMOTE, and SET). Using the supplied 8‐pin plug and 22AWG wire, follow the procedures below: 1.
Remote Control Method A: Using two external variable DC voltage sources A variable external voltage source of 0 ~ 5VDC is fed into the remote control terminal to adjust the output voltage level. Warning! Do not input voltage higher than 5V, otherwise the Over Voltage Protection (OVP) will be triggered. 1. Ensure that the load is disconnected and that the power supply is OFF. 2. Use ONLY the wires from Port 2 (Positive) and Port 4 (Negative) 3. Switch on the power supply. 4.
Remote Control Method B: Using two external variable 5k ohm resistors 1. Ensure that the load is disconnected and that the power supply is OFF. 2. Prepare two 5k ohm variable resistors as shown in the diagram below and use the wires from Port 1, 2 and 4 as shown. 3. Switch the power supply ON. 4. Adjust the Pin 2 5k ohm variable resistor from one end to other end to check and verify the full output voltage range of the power supply. 5.
Overload Protection OUP: Over Voltage Protection C.V. oup A C.C. This unit has a built‐in over‐voltage protection feature. In the event of an output voltage exceeding the allowable range (refer to the specifications section for range limits), protection will be triggered and the output power will be switched off. (OUP warning appears). To reset the warning, switch off the power supply and remove all loading. Switch the unit to resume normal operation.
Maintenance and Repair Services Cleaning the meter housing Prior to cleaning the meter housing, disconnect the mains plug from the power outlet. Clean only with a damp, soft cloth and a commercially available mild household cleaner. Ensure that no water gets inside the equipment to prevent possible shorts and damage to the equipment.
Input Voltage Rated Load Input Current Efficiency Switching Frequency Cooling Method Protections Transient Response Time Power Factor Control Special Features Operating Humidity Range Altitude Pollution Degree Main Supply Voltage Fluctuation Dimensions (WxHxD) Weight Approvals 100 to 120VAC 50/60Hz (Model 382275) 210 to 230VAC 50/60Hz (Model 382276) 3.1A Model 382276) 5.
