Myung Youn Electronics DPS MY-PS-15 Digital Phase Converter Instruction Manual

1. Introduction

The Myung Youn Electronics DPS MY-PS-15 is a Digital Phase Converter designed to convert single-phase 200-240V power into three-phase 200-240V power. This unit is specifically engineered for use with a single 10HP (7.5kW) 30A three-phase motor. It provides a reliable and efficient solution for operating three-phase machinery in environments where only single-phase power is available.

This manual provides essential information for the safe and effective installation, operation, and maintenance of your DPS MY-PS-15 Digital Phase Converter. Please read it thoroughly before use and retain it for future reference.

Figure 1: DPS MY-PS-15 Digital Phase Converter. This image shows the front view of the converter with its model number, input/output specifications, and UL listing.

2. Safety Information and Cautions

WARNING: Electrical equipment should only be installed and serviced by qualified personnel. Failure to follow these instructions can result in serious injury or death.

• Always disconnect power before installing or servicing the DPS unit or connected motor.
• Ensure proper grounding of the DPS and the motor.
• Do not operate the DPS in wet or damp conditions.
• The DPS MY-PS-15 model must be used for a 10HP (7.5kW) 30A 3-phase motor only.
• Do not use a DPS model that is not suitable for your motor specifications. Incorrect sizing can lead to motor damage, overheating, or noise.
• Always check your motor's horsepower (HP), rated current (A), and voltage (V) before selecting a DPS model.
• One DPS unit must be used for one motor only. Never connect a single DPS to multiple motors.
• The wiring of the motor must be set to 200V-240V (Delta wiring - Low voltage).
• Input and output voltages of the DPS are 200V-240V.
• The wire thickness should be selected to match the motor's rated current and the capacity of the DPS.
• DPS does not operate with 3-phase motors equipped with a 3-phase brake.
• If your machine has a magnetic contactor, it must be 220V only. DPS cannot work for 380V or 440V magnetic contactors.

Figure 2: Important safety and usage cautions for the DPS MY-PS-15. This image reiterates critical warnings regarding motor compatibility and wiring.

3. Product Features

• Converts single-phase power to three-phase power for motors.
• Easy to connect and use.
• Compact size and lightweight design.
• Maintains continuous three-phase power supply after motor startup.
• UL Listed (UL-US-2328605-1, UL-CA-2324527-1) for safety and compliance.
• Digital type phase converter with excellent start-up torque.
• Low failure rate and designed to be non-flammable.
• Sealed type construction protects against dust, moisture, and heat.
• Operates without generating high-frequency noise.
• Lower power consumption compared to other phase converters.
• High efficiency, approximately 90%, when correctly matched to motor specifications.

Figure 3: Dimensions and key features of the DPS MY-PS-15. The image highlights the physical size (9.1" H x 5.7" W x 4.9" D) and net weight (5.3 lbs / 2.4 kg), along with a list of product benefits.

4. Model Selection Guide

It is crucial to select the correct DPS model for your motor to ensure optimal performance and prevent damage. The MY-PS-15 model is specifically designed for a 10HP (7.5kW) 30A 3-phase motor.

Figure 4: Guide for selecting the correct DPS model. This image illustrates that the MY-PS-15 model is exclusively for 10HP motors and should not be used with lower HP motors like 7.5HP or 5HP, as it can cause overheating or noise.

Using a DPS model with a horsepower rating higher than the motor's specifications (e.g., MY-PS-15 with a 7.5HP motor) can lead to the motor generating heat or noise due to overcurrent. Always match the DPS to the motor's exact specifications.

DPS Model Compatibility Chart

Figure 5: DPS Model Selection Chart. This table provides a comprehensive guide for matching DPS models to various 3-phase motor specifications, including rated HP/kW and rated current (AMP).

5. Installation and Wiring

Proper installation and wiring are critical for the safe and efficient operation of your DPS MY-PS-15. Refer to the diagram below for connection details.

Figure 6: Wiring diagram for DPS MY-PS-15. This diagram illustrates how to connect the single-phase 220-240V input to the DPS and the 3-phase 200-240V output from the DPS to a 10HP motor.

Wiring Steps:

1. Input Connection: Connect the 200V-240V single-phase power supply to the input terminals (R and S) of the DPS unit. Ensure the power is off before making connections.
2. Output Connection: Connect the three-phase output terminals (U, V, W) of the DPS to your 10HP 3-phase motor.
3. Motor Wiring: Ensure the motor's internal wiring is configured for 200V-240V (Delta wiring - Low voltage). Consult your motor's manual for specific wiring instructions.
4. Wire Gauge: Use appropriate wire gauges suitable for the motor's rated current (30A for 10HP) and the DPS capacity.
5. Magnetic Contactor (if applicable): If a magnetic contactor is connected to the motor and DPS, you must connect two control wires from the magnetic contactor to the 'U' and 'W' terminals of the DPS output. Ensure the magnetic contactor is rated for 220V.

6. Operating Instructions

Once the DPS MY-PS-15 is correctly installed and wired, follow these steps for operation:

1. Power On: Turn on the single-phase power supply to the DPS unit.
2. Motor Start: Initiate the motor's operation. The DPS creates induced three phases by running the motor.
3. Phase Measurement: Three phases can be measured at the DPS output only when the motor is running. If the motor is not running, you will not measure three phases at the DPS output.

7. Maintenance

The DPS MY-PS-15 is designed for low maintenance due to its sealed construction, which protects internal components from dust and moisture. Regular maintenance should focus on ensuring proper electrical connections and environmental conditions.

• Visual Inspection: Periodically inspect the unit and wiring for any signs of damage, loose connections, or overheating.
• Cleanliness: Keep the area around the DPS unit clean and free from obstructions to ensure adequate ventilation.
• Environmental Conditions: Ensure the operating environment is within specified temperature and humidity ranges. Avoid exposure to direct sunlight or excessive heat.

8. Troubleshooting

If you encounter issues with your DPS MY-PS-15, refer to the following troubleshooting guide:

• Motor Does Not Start or Runs in Reverse:
  • If the motor does not work even though power is on after connecting the DPS and motor, switch the wire positions of 'U', 'V', and 'W' for the DPS's output at least 3 times.
  • If the motor operates in reverse rotation, swap the positions of the 'U' and 'W' wires of the DPS output to achieve forward rotation.
• Motor Generates Heat or Noise:
  • This often indicates an incorrect DPS model selection. Ensure the MY-PS-15 is used only with a 10HP motor. Using a higher-rated DPS with a lower HP motor can cause overcurrent.
  • Check if the motor is overloaded. Reduce the load if necessary.
• Current Imbalance:
  • When the motor initially starts with low load, the current on the 'U' and 'W' phases of the DPS output may be imbalanced. This is normal.
  • When more than 50% load is applied to the motor, the 'U' and 'W' current values should balance. The 'V' phase current will be approximately equal to the motor's rated current.
  • If current remains imbalanced even with more than 50% load, re-check the DPS model settings and ensure it matches the motor specifications. Also, verify the motor is not overloaded.
• No Three-Phase Output:
  • Remember that the DPS creates induced three phases by running the motor. You will only measure three phases at the DPS output when the motor is actively running.

9. Specifications

• Model: MY-PS-15
• Applicable Motor: 10HP (7.5kW) 30A 3-Phase Motor
• Input Voltage: 200-240V Single-Phase
• Output Voltage: 200-240V Three-Phase
• Frequency: 50/60 Hz
• Current Rating: 30 Amps
• Efficiency: Approximately 90%
• Dimensions (D x W x H): 4.9" x 5.7" x 9.1" (125mm x 145mm x 230mm)
• Item Weight: 5.2 lbs (2.4 kg)
• Mounting Type: Floor Mount
• Power Source: Corded Electric
• Certifications: UL Listed (UL-US-2328605-1, UL-CA-2324527-1)
• Manufacturer: Myung Youn Electronics
• ASIN: B09MVVR13W
• UPC: 793072636276

10. Warranty and Support

For warranty information, technical support, or service inquiries, please contact Myung Youn Electronics directly or refer to the product packaging for specific contact details. Keep your purchase receipt as proof of purchase.

Manufacturer: Myung Youn Electronics

Date First Available: August 12, 2021