1. Introduction
This manual provides essential information for the safe and effective installation, operation, and maintenance of the EverSale MW Mean Well MSP-300-24 Medical Power Supply. The MSP-300-24 is a 300W single output medical type power supply designed for various medical applications, featuring an enclosed-PFC design and a 24V, 14A output.
Key features of this power supply include:
- Medical safety approved (MOOP level)
- Universal AC input / Full range
- Low leakage current (<300µA)
- Withstands 300VAC surge input for 5 seconds
- Built-in active PFC function
- Protections: Short circuit, Overload, Over voltage, Over temperature
- 1U low profile design
- Built-in constant current limiting circuit
- Built-in remote sense function
- No load power consumption <0.5W
- Built-in remote ON/OFF control
- Built-in 5V/0.3A standby output
- Built-in DC OK signal
- LED indicator for power on
- 5 years warranty
2. Important Safety Information
Please read all instructions carefully before installation and operation. Failure to follow these safety guidelines may result in electric shock, fire, or damage to the product.
- Qualified Personnel Only: Installation and servicing must be performed by qualified personnel only.
- Medical Application: This power supply is approved for medical applications (MOOP level). Ensure its use complies with all relevant medical device regulations and standards.
- Input Voltage: Verify that the input voltage range (Universal AC input) matches your local power supply.
- Grounding: Ensure proper grounding of the unit to prevent electric shock.
- Ventilation: Do not obstruct ventilation openings. Adequate airflow is crucial for proper cooling and to prevent overheating.
- Environmental Conditions: Operate the unit within specified temperature and humidity ranges. Avoid exposure to moisture or extreme temperatures.
- Disconnection: Disconnect the power supply from the AC mains before performing any installation, maintenance, or troubleshooting.
- High Voltage: Internal components may retain high voltage even after power is disconnected. Allow sufficient discharge time before handling.
3. Product Overview and Mechanical Specifications
The MSP-300-24 features a compact design with clearly labeled terminals for easy integration. Below is a diagram illustrating the mechanical dimensions, terminal assignments, and internal block diagram.
Figure 3.1: Mechanical Specifications, Terminal Pin Assignments, Block Diagram, and Derating Curves.
3.1 Terminal Pin Assignment
The main power input and output connections are made via the terminal block. Refer to the table below for pin assignments:
| Pin No. | Assignment | Pin No. | Assignment |
|---|---|---|---|
| 1 | AC/L | 4 | DC OUTPUT +V |
| 2 | AC/N | 5, 6, 7 | DC OUTPUT -V |
| 3 | FG (Frame Ground) |
3.2 Connector Pin Assignment (CN100)
The CN100 connector provides access to auxiliary functions such as remote sense, DC-OK signal, and remote ON/OFF control. This connector is an HRS DF11-8DS or equivalent.
| Pin No. | Assignment | Terminal |
|---|---|---|
| 1 | AUX | AUXG |
| 2 | AUXG | |
| 3 | DC-OK | |
| 4 | RC | HRS DF11-8DS or equivalent |
| 5 | GND | |
| 6 | RC+ | |
| 7 | +S | |
| 8 | -S |
3.3 Block Diagram
The internal block diagram illustrates the functional stages of the power supply, including EMI filter, active inrush current limiting, PFC control, power switching, rectifiers, filters, and protection circuits (O.T.P., O.L.P., O.V.P.).
3.4 Derating Curve
The derating curve indicates the maximum permissible output load as a function of ambient temperature and input voltage. Operating within these limits ensures optimal performance and longevity of the power supply.
4. Function Description
This section details the functions available via the CN100 connector, including auxiliary output, remote sense, DC-OK signal, and remote control.
Figure 4.1: Function Description of CN100, Remote Sense, and DC-OK Signal.
4.1 CN100 Pin Functions
The following table provides a detailed description of each pin on the CN100 connector:
| Pin No. | Function | Description |
|---|---|---|
| 1 | AUX | Auxiliary voltage output, 4.75~5.25V, reference to pin 2 (AUXG). The maximum load current is 0.3A. This output has the built-in oring diodes and can be controlled by the remote ON/OFF control. |
| 2 | AUXG | Auxiliary voltage output ground. This output return is isolated from the output terminals (+V & -V). |
| 3 | DC-OK | DC-OK signal is a TTL level signal, referenced to pin 5 (DC-OK GND). High when PSU turns on. |
| 4 | RC | Remote control ground. |
| 5 | GND | This is connected to the negative terminal(-V). Return for DC-OK signal output. |
| 6 | RC+ | Turns the output on and off by electrical or dry contact between pin 4 (RC-), Short: Power OFF, Open: Power ON. |
| 7 | +S | Positive sensing. The +S signal should be connected to the positive terminal of the load. The +S and -S leads should be twisted in pair to minimize noise pick-up effect. The maximum line drop compensation is 0.5V. |
| 8 | -S | Negative sensing. The -S signal should be connected to the negative terminal of the load. The +S and -S leads should be twisted in pair to minimize noise pick-up effect. The maximum line drop compensation is 0.5V. |
4.2 Remote Sense
The remote sensing function compensates for voltage drop across the load wiring, ensuring accurate voltage delivery at the load. Connect the +S and -S pins to the positive and negative terminals of the load, respectively. The maximum line drop compensation is 0.5V.
Figure 4.2: Remote Sense Connection Diagram.
4.3 DC-OK Signal
The DC-OK signal is a TTL level output that indicates the status of the power supply's DC output. It is referenced to pin 5 (DC-OK GND) and goes high when the PSU is operating normally.
| Between DC-OK(pin3) and GND(pin5) | Output Status |
|---|---|
| 3.3 ~ 5.6V | ON |
| 0 ~ 1V | OFF |
Figure 4.3: DC-OK Signal Connection Diagram.
5. Remote Control
The power supply can be turned ON/OFF remotely using the RC+ and RC- pins on the CN100 connector. This function allows for external control of the power supply's output.
Figure 5.1: Remote Control Connection Diagram.
The output status is controlled by the connection between RC+ (pin 6) and RC- (pin 4):
| Between RC+(pin6) and RC-(pin4) | Output Status |
|---|---|
| SW ON (Short) | OFF |
| SW OFF (Open) | ON |
6. Setup and Installation
Follow these steps for proper installation of your MSP-300-24 power supply:
- Mounting: Securely mount the power supply in a well-ventilated area, ensuring adequate clearance for airflow around the unit. Refer to the mechanical specifications for dimensions and mounting hole locations.
- AC Input Connection: Connect the AC mains input wires to the L (Live), N (Neutral), and FG (Frame Ground) terminals on the main terminal block according to the pin assignment in Section 3.1. Ensure all connections are tight and secure.
- DC Output Connection: Connect the DC load wires to the +V and -V terminals on the main terminal block. Observe correct polarity.
- Auxiliary Connections (Optional): If using remote sense, DC-OK signal, or remote ON/OFF control, connect the appropriate wires to the CN100 connector as detailed in Sections 4 and 5.
- Initial Check: Before applying power, double-check all wiring for correctness, polarity, and secure connections. Ensure no loose strands could cause short circuits.
- Power On: Apply AC power. The LED indicator should illuminate, indicating the unit is powered on.
7. Operation
Once installed, the MSP-300-24 operates automatically. The output voltage is regulated at 24V. The built-in protections (short circuit, overload, over voltage, over temperature) will activate to protect the unit and connected equipment in case of abnormal conditions.
- LED Indicator: A green LED indicates that the power supply is receiving input power and the output is active.
- Remote Control: If configured, the remote ON/OFF function can be used to enable or disable the output without physically disconnecting the AC input.
- Remote Sense: If connected, the remote sense function will automatically compensate for voltage drops in the output wiring, maintaining precise voltage at the load.
- DC-OK Signal: Monitor the DC-OK signal for an indication of the power supply's operational status.
8. Maintenance
The MSP-300-24 is designed for reliable operation with minimal maintenance. However, periodic checks can help ensure its longevity and performance.
- Cleaning: Periodically clean the exterior of the unit and ventilation openings to prevent dust accumulation, which can impede cooling. Use a soft, dry cloth. Do not use liquid cleaners.
- Connections: Regularly inspect all input and output connections to ensure they remain tight and free from corrosion.
- Environmental Check: Ensure the operating environment remains within specified temperature and humidity limits.
- Fan Operation: For models with a cooling fan, ensure the fan is operating correctly and not obstructed.
Note: There are no user-serviceable parts inside. Refer all servicing to qualified service personnel.
9. Troubleshooting
If the power supply is not functioning as expected, perform the following basic troubleshooting steps:
- No Output Power / LED Off:
- Check the AC input voltage and ensure it is within the specified range.
- Verify that the AC input connections are secure.
- If using remote ON/OFF control, ensure it is configured for the ON state (open circuit between RC+ and RC-).
- Check for tripped circuit breakers or blown fuses in the AC supply line.
- Output Voltage Low or Unstable:
- Check the load current to ensure it does not exceed the power supply's maximum output current (14A).
- Inspect output wiring for excessive length or insufficient gauge, especially if remote sense is not used or improperly connected.
- Ensure the operating temperature is within limits; overheating can cause derating or shutdown.
- Overload Protection Activated:
- Reduce the load connected to the power supply.
- Disconnect the load and re-apply power to see if the unit recovers.
- Over Temperature Protection Activated:
- Ensure adequate ventilation around the power supply.
- Check for any obstructions to airflow.
- Reduce ambient temperature if possible.
If the problem persists after performing these steps, contact qualified service personnel or technical support.
10. Technical Specifications
Below are the detailed technical specifications for the MSP-300-24 power supply:
| Specification | Value |
|---|---|
| Product Dimensions (L x W x H) | 7.83 x 4.13 x 1.61 inches |
| Item Weight | 2.08 ounces (0.13 Pounds) |
| Output Wattage | 300 Watts |
| Wattage | 300 watts |
| Brand | EverSale |
| Manufacturer | MEAN WELL |
| Item model number | MSP-300-24 |
| ASIN | B00FRBSVIK |
| Date First Available | October 10, 2013 |
11. Warranty and Support
The EverSale MW Mean Well MSP-300-24 Medical Power Supply comes with a 5-year warranty from the date of purchase, covering defects in materials and workmanship under normal use.
For technical support, warranty claims, or service inquiries, please contact your authorized EverSale distributor or reseller. Please have your product model number (MSP-300-24) and purchase information ready when contacting support.