EasyManua.ls Logo

MCH 300 Series - User Manual

Default Icon
9 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
OPERATION MANUAL
SWITCHING DC POWER SUPPLY

Table of Contents

Question and Answer IconNeed help?

Do you have a question about the MCH 300 Series and is the answer not in the manual?

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Model Type (MCH-305D-II)
  4. Variable Output
  5. Fixed Output
  6. Others
  7. Usage Features
  8. Front Panel Controls
  9. Connection of Output Ports
  10. Voltage Setting
  11. Current Setting
  12. Serial Usage
  13. Parallel Usage
  14. Maintenance Features
  15. Accessories
  16. Cautions and Troubleshooting

This document describes the MCH-305D-II Switching DC Power Supply, a 300 series regulated DC power supply designed for high stability and accuracy. Its modular, block-like structure allows for easy expansion from single to multi-channel configurations, making it suitable for R&D departments, colleges, and factories.

Function Description:

The MCH-305D-II is a dual-channel regulated DC power supply providing variable voltage and current outputs, along with a fixed 5V/2A output. It operates in either Constant Voltage (CV) or Constant Current (CC) mode, indicated by LED lights. The device features independent, series, and parallel control modes for its two main channels, allowing for flexible output configurations.

Important Technical Specifications:

Model Type (MCH-305D-II):

  • Voltage: 0~30V (for both channels)
  • Current: 0~5A (for both channels)
  • Fixed Output: 5V/2A
  • Dual Output: Yes
  • Spot: Yes

Variable Output:

  • Output Voltage: 0~30V continuously adjustable
  • Output Current: 0~specified value continuously adjustable
  • Source Regulation: ≤0.01% +3mV
  • Load Regulation: ≤0.01% +3mV
  • Ripple & Noise: ≤20mVrms
  • Tracing Error: 0.5% +10mV
  • Display: 3 or 4 digit LED
  • Display Error: ≤0.5% + 1digit

Fixed Output:

  • Output Voltage: 5V
  • Output Current: 2A
  • Source Regulation: <5mV
  • Load Regulation: ≤0.01%+3mV
  • Ripple & Noise: <20mVrms

Others:

  • Line Power Supply: 220V±10%
  • Operating Ambient: Temperature: 0℃-40℃, Humidity: ≤90%RH
  • Dimension: 240X150X270(mm)
  • Weight: Approx. 8kg

Usage Features:

Front Panel Controls:

The front panel features two main output channels, CH-A and CH-B, each with dedicated voltage and current adjustments.

  1. 3 or 4 digit LED display (1, 2): Shows the output voltage and current for each channel.
  2. CV and CC indicators (3, 4): Light up to indicate whether the power supply is operating in Constant Voltage or Constant Current mode. In CV mode, the current is lower than the preset value. In CC mode, the current is limited to the preset value.
  3. Independent/Series/Parallel Controls (5): These buttons allow selection of the operating mode for the two main channels:
    • Independent: Channels operate separately.
    • Series: Channels are connected in series. Voltage of CH-A follows CH-B, providing a pair of same-value, different-polarity voltages. A doubled voltage can be obtained from the positive port of CH-B and the negative port of CH-A.
    • Parallel: Channels are connected in parallel. A doubled current can be obtained from either output port of the two channels.
  4. Power switch (6): Turns the device on and off.
  5. Voltage adjustment (7, 8): Coarse and fine knobs to set the desired output voltage for each channel. If in tracking state (series/parallel), CH-A voltage switches may not be available.
  6. Current adjustment (9, 10): Coarse and fine knobs to set the constant current value for each channel.
  7. Output port No.1 (11): Fixed 5V/2A output. Its negative terminal is internally grounded.
  8. Output port No.2 (12): Controlled by voltage adjustment (7) and current adjustment (9).
  9. Output port No.3 (13): Controlled by voltage adjustment (8) and current adjustment (10).

Connection of Output Ports:

  • Port No.2 and No.3 are in floating mode, allowing for different polarity voltages by connecting positive or negative terminals to the ground terminal in the middle.
  • Port No.1 is a fixed output with its negative terminal internally grounded.

Voltage Setting:

Adjust the voltage knob (coarse and fine) to achieve the desired output voltage.

Current Setting:

Turn the current control knob counter-clockwise (CCW) to set a small initial current value. Short-circuit the output port, then adjust the current knob to the desired value.

Serial Usage:

  1. Select "series mode" using the Independent/Series/Parallel controls (5).
  2. Use the "+" end of port No.3 and the "-" end of port No.2 as the output terminals.
  3. The output voltage will be the summation of channel A and channel B voltages.

Parallel Usage:

  1. Select "parallel mode" using the Independent/Series/Parallel controls (5).
  2. Use either one of the output terminals of the two channels.
  3. A doubled current can be acquired.

Maintenance Features:

Accessories:

  • Power Cord: 1pc
  • User's Manual: 1pc
  • Fuse: 1pc

Cautions and Troubleshooting:

  1. No CV indicator light after power on: If the line power is confirmed to be working, the fuse is likely broken. Power off, disconnect the power cord, and replace the fuse.
  2. Output voltage lower than preset in CV state, CC indicator lights: The instrument has automatically switched to Constant Current state. Check the load or increase the output current.
  3. Output current lower than preset in CV state, CV indicator lights: The instrument has automatically switched to Constant Voltage state. Check the load or increase the output voltage.
  4. Unstable instrument in Constant Voltage state: This may be due to the line voltage being under 90% of the rated value. If the problem persists and is not caused by line voltage, contact your nearest dealer.

MCH 300 Series Specifications

General IconGeneral
BrandMCH
Model300 Series
CategoryPower Supply
LanguageEnglish