ABB PSR45-600-70 Soft Starter

The ABB PSR45-600-70 is a compact two-phase control soft starter (Order No.: 1SFA896111R7000) with a rated operating current of 45A, a main voltage range of 208–600V AC, and a control voltage range of 100–240V AC. Equipped with a built-in bypass contactor, it is suitable for 22kW (400วี) three-phase motors and commonly applied in light-to-medium load scenarios such as pumps, fans, and compressors. Below are the structured technical and application highlights:

Core Technical Parameters (Essential for Selection & Quotation)

Key Features & Advantages

1. Control Mode: Two-phase voltage ramp control enables smooth startup with low current impact, ideal for light-to-medium load motors.
2. Built-in Bypass: Switches to the bypass contactor after startup completion, reducing operating losses and extending the service life of power devices.
3. Convenient Commissioning: Three front-panel potentiometers (start time, stop time, initial voltage) allow quick on-site setting without software.
4. Expansion Capability: Supports external Fieldbus Plug adapters for communication protocols such as PROFIBUS-DP/Modbus RTU, suitable for remote monitoring scenarios.
5. Matching Installation: Recommended to be paired with the ABB MS450 36–45A manual motor starter (MMS); a mechanical connection kit is available to enhance system integration.

Selection & Application Boundaries

Applicable Loads: Equipment without frequent heavy-load startup, such as pumps, fans, คอมเพรสเซอร์, and belt conveyors. Not suitable for high-inertia or heavy-load startup (เช่น, crushers, ball mills).

การป้องกันการโอเวอร์โหลด: No built-in electronic overload protection; external thermal relays or MMS (เช่น, MS450 36–45) are required for motor overload protection.

Communication Expansion: No communication function as standard; remote control requires separate purchase of a Fieldbus adapter and plug.

Installation & ประเด็นสำคัญของการเดินสายไฟ

1. Installation: Mount vertically inside the cabinet with reserved heat dissipation space. It is recommended to be used in combination with an MMS manual starter, with mechanical interlocking via a connection kit.
2. Wiring: Use copper conductors for the main circuit (16–25mm² recommended) and 0.75–2.5mm² conductors for the control circuit. Tighten terminals in accordance with torque specifications.
3. Commissioning: Set the start time, stop time, and initial voltage using the front-panel potentiometers based on the motor rated current and load characteristics to avoid overcurrent or under-torque.

สถานการณ์การใช้งานทั่วไป

HVAC system fans/water pumps

Small air compressors

Belt conveyors

General industrial pump loads

Comparison with Competitors/Same Series (Quick Selection Reference)

Procurement & Spare Parts Information

Order No.: 1SFA896111R7000

EAN: 7320500338346

Common Spare Parts: Fieldbus Plug (เช่น, FPBA-01), mechanical connection kit, MS450 series manual starters.

Replacement Guide for Built-in Bypass Contactor of ABB PSR45-600-70 Soft Starter

1. Safety Preparation (Critical)
2. การดำเนินการปิดเครื่อง: Disconnect the upstream power circuit breaker and hang a “No Switching On, Personnel Working” warning sign.
3. Voltage Verification: Use a multimeter to measure the power input terminals and ensure zero voltage (0V for all three phases).
4. Discharge Wait: Wait at least 5 minutes after power-off to allow internal capacitors to discharge completely.
5. Tool Preparation:

Insulated screwdriver set (flathead, Phillips)

Torque wrench (main circuit: 4N·m; control circuit: 0.6N·m)

Multimeter

Conductive paste (for main contact connection)

Marker pen and insulating tape (for cable marking)

1. Disassembly Steps
2. Open the Soft Starter Housing

Unscrew the fixing screws of the soft starter front cover (usually located at the four corners).

Carefully remove the front cover to avoid damaging internal connecting wires.

2. Mark and Disconnect Connecting Wires

วงจรควบคุม:

Mark the two control wires of the bypass contactor coil (usually connected to the internal relay output of the soft starter).

Loosen the terminal screws, remove the control wires, and wrap them with insulating tape for protection.

Main Circuit:

Mark the copper bars/cables connecting the three-phase power input (L1/L2/L3) and motor output (T1/T2/T3) to the bypass contactor.

Loosen the connecting bolts with a torque wrench and record the original torque value.

Remove all connecting copper bars/cables and place them in a safe location.

3. Remove the Old Contactor

Locate the built-in bypass contactor (usually on the right side inside the soft starter, parallel to the thyristor module).

Unscrew the four fixing screws of the contactor (usually located at the four corners of the contactor base).

Carefully take out the old contactor without damaging surrounding circuits.

III. Install the New Contactor

1. Check the New Contactor Specifications

Ensure the parameters of the new contactor match the original one:

จัดอันดับปัจจุบัน: 45ก

แรงดันไฟฟ้าคอยล์: 100-240วีและ (consistent with the soft starter control voltage)

หมายเลขขั้วโลก: 3-เสา

Brand: เอบีบี (original accessories are recommended)

2. Installation and Fixing

Align the new contactor with the installation position to ensure the mounting holes are matched.

Tighten the four fixing screws with moderate torque to avoid housing damage due to over-tightening.

3. Connect the Circuits

Main Circuit:

Restore the three-phase connecting copper bars/cables according to the marks.

Apply a thin uniform layer of conductive paste on the contact surfaces to reduce contact resistance.

Tighten the bolts to the standard torque value with a torque wrench: 4N·m.

วงจรควบคุม:

Connect the contactor coil control wires according to the marks.

Ensure firm connection without loosening.

Tighten the terminal screws to the standard torque value: 0.6N·m.

1. Testing and Verification
2. Static Inspection

Check that all wiring is correct and firm without loosening or short-circuit risks.

Use a multimeter to measure the contactor coil resistance (it should be tens to hundreds of ohms; refer to the specification sheet for details).

Manually operate the contactor (press the main contacts) and check if the auxiliary contacts switch on/off normally.

2. No-Load Test

Restore the control power supply (do not connect the main power supply temporarily).

Observe whether the soft starter panel displays normally.

Start the motor via the soft starter (a contactor closing sound should be heard at this time).

Use a multimeter to measure the voltage at the contactor output terminals and confirm three-phase balance.

3. Load Test

Disconnect the control power supply and restore the main power supply connection.

Verify the power-off status again for safety, then close the upstream circuit breaker.

Start the motor normally via the soft starter and observe the following:

Whether the startup process is smooth.

Whether the bypass contactor closes normally (ก “click” sound can be heard) after startup completion (approximately 1–10 seconds).

Whether the run indicator light is on normally.

Measure the operating current and confirm it does not exceed the soft starter rated value of 45A.

1. Common Problems & ข้อควรระวัง
2. Contactor Fails to Close

Check if the coil voltage is normal (whether the control power supply is connected correctly).

Check if the control circuit wiring is loose or broken.

Confirm that the soft starter parameter settings are correct (whether the start time is long enough).

2. Abnormal Contactor Heating

Check if the main circuit connection is firm (re-tighten to the standard torque).

Ensure conductive paste is used to improve contact performance.

Avoid using non-original contactors (which may cause parameter mismatch).

3. Replacement Precautions

Only use the same model or ABB-approved alternatives to ensure consistent rated current and coil voltage.

Do not omit the installation of auxiliary contact connecting wires; มิฉะนั้น, it will affect the soft starter status feedback.

Pay attention to the correct orientation of the contactor during installation to avoid interference with other components.

Live operation is strictly prohibited; safety is the top priority.

1. สรุป & Subsequent Maintenance

After replacement, it is recommended to record the replacement date and contactor batch number and incorporate them into the regular maintenance plan. The designed service life of the built-in bypass contactor of the PSR45-600-70 is usually 5–10 years or more than 100,000 starts. Regular inspection (once a quarter) of the contactor contact status can extend its service life.