3 Phase Converter Installation Guide

DPS Installation Guide

This guide explains the basic installation process of DPS using a three-phase compressor as an example.

The exact wiring may vary depending on the machine, motor, control panel, and magnetic contactor configuration. Before installation, always check the motor nameplate, wiring diagram, input voltage, breaker size, and control circuit.

For safety, installation should be performed by a qualified electrician.

Watch the Installation Example

In the video, we use a three-phase compressor as a representative example to show how DPS is installed and connected.

DPS is designed to operate a three-phase 200–240V motor from a single-phase 200–240V power source. Before installing DPS, confirm that your motor and machine are compatible.

Step by Step

Step-1

Check the Motor Nameplate and Select the Correct DPS Model

Before purchasing or installing DPS,
check the motor nameplate on your machine.

Confirm the following information:

Horsepower
Voltage
Amperage
Phase

DPS must be selected according to the actual motor capacity. Choosing a model that is too small may cause overload or unstable operation. Choosing a model that is too large is also not recommended, because an oversized DPS may cause voltage imbalance, overvoltage, or unstable performance when the motor load is too low.

DPS should be selected based on the motor’s nameplate rating, not by guessing or simply choosing a larger model.

Step-2

Check the Input Voltage and
Available Circuit Capacity

DPS can only be used with a single-phase
200–240V input power source.

Do not use DPS with 110V input power.
Do not use DPS with 380V, 440V, 460V, or 480V input power.

Also make sure that the electrical circuit has enough capacity to operate the motor. Check the breaker size, wire size, and available amperage before installation.

Because motors require higher current during startup, the breaker may need to be larger than the motor’s rated running current. As a general reference, a breaker around twice the motor rated current may be used in some motor applications. However, the correct breaker size and wire gauge must be determined according to the motor specifications, installation conditions, and local electrical code.

Step-3

Confirm the Motor Output Voltage Setting

Check that the motor is wired for
200–240V operation

DPS does not convert voltage.
It does not step up 220V to 380V,
440V, 460V, or 480V

Step-4

Connect everything and turn on the power

No 3-Phase?

No 3-Phase from V-W is no prblem

DPS is designed to operate a three-phase motor using single-phase 200–240 V power.

Unlike a standard three-phase power supply, DPS works together with the connected motor. When the motor starts and runs, DPS generates the required phase-shifted output and allows the motor to operate as a three-phase motor.

Because DPS creates the three-phase output while the motor is running, three-phase voltage can be measured at the DPS output only when the motor is operating. If the motor is not running, three-phase voltage may not be properly measured at the DPS output.

For this reason, DPS should always be checked under actual motor-running conditions, not by measuring the output with no motor load connected.

Due to this operating characteristic, the output voltage on each phase may not show exactly 220 V, and the measured values may be different from each other. This is normal for DPS operation. As the motor load increases to 50% or more of its rated load, the output becomes more balanced. Lower voltage readings tend to rise, while readings that appear high may settle into a more appropriate range.

The operating efficiency of DPS is approximately 90% based on the motor nameplate rating. Since DPS converts single-phase power for use with a three-phase motor, it cannot provide 100% efficiency or support a load higher than the rated motor capacity.

More information on How DPS works

Doesn't work?

Magnetic Contactor Precautions

DPS cannot be used with 380V, 440V, or other high-voltage magnetic contactors. Only 220V magnetic contactors are supported.

If the magnetic contactor inside your purchased 3-phase machine is not 220V, replace it with a 220V model.

The magnetic contactor control wires must be connected to the U and W terminals.

If you are unsure of the exact U and W positions, try shifting the U-V-W wires on the DPS output terminals one position at a time and test the operation.

If you want to change the rotation direction, swap the U and W wires.

This issue is commonly reported by compressor users. Please refer to the video at the top of the page.