BESTDO SM852B 3 Phase Sequence Rotation Tester User Manual

1. Introduction

The BESTDO SM852B is a compact and efficient instrument designed to accurately measure the phase sequence and open phase conditions in three-phase AC circuits. It utilizes LED indicators and an audible buzzer to provide clear and immediate feedback. This manual provides essential information for the safe and effective use of your SM852B tester.

2. Safety Information

WARNING: Failure to follow these safety instructions may result in electric shock, fire, or serious injury.

• Do not expose the instrument to water or other corrosive liquids.
• Avoid placing the device in direct sunlight or environments with high temperatures and humidity, as this can affect its performance and lifespan.
• Ensure the operational voltage is within the specified range of 60V to 600V AC (3 Phase).
• Observe the continuous use time limits: 60 minutes maximum at 60V AC and 4 minutes maximum at 600V AC. Exceeding these limits can damage the device.
• This device is not a voltage detector. One phase can be live even if all orange LEDs are off during an open phase check. Always verify voltage with a dedicated voltage detector before touching any conductors.
• Always wear appropriate personal protective equipment (PPE) when working with electrical systems.
• Do not attempt to open or repair the device. Refer all servicing to qualified personnel.

3. Product Overview

The SM852B Phase Sequence Rotation Tester consists of the main unit and three test leads with alligator clips. The main unit features LED indicators for phase presence and rotation, along with a buzzer for audible alerts.

Figure 3.1: Front view of the BESTDO SM852B tester, showing the main unit with its LED indicators for U, V, W phases, CCW (Counter-Clockwise) and CW (Clockwise) rotation, and the attached red, yellow, and green test leads with their respective alligator clips.

3.1 Components

• Main Unit: Houses the circuitry, LED indicators, and buzzer.
• Test Leads: Three color-coded leads (red, yellow, green) for connecting to the three phases.
• Alligator Clips: Detachable clips for secure connection to terminals.

3.2 Indicator Functions

Figure 3.2: Back view of the SM852B tester, displaying key operational specifications and a table detailing LED and buzzer indications for open phase and phase sequence checks.

The back of the unit provides a quick reference for LED and buzzer indications:

4. Setup

Before using the SM852B tester, ensure all components are present and in good condition.

1. Inspect Components: Verify that the main unit, test leads, and alligator clips are free from damage. Do not use if any part is damaged.
2. Attach Alligator Clips: Securely attach the red, yellow, and green alligator clips to their corresponding test leads. Ensure a firm connection.

Figure 4.1: Image showing the individual test probes and the separate alligator clips, ready for assembly or use with different connection types.

Figure 4.2: Image depicting the test probes with the alligator clips securely attached, illustrating the ready-to-use configuration for connecting to electrical terminals.

5. Operating Instructions

Follow these steps to use the SM852B tester for phase sequence and open phase detection.

1. Connect Test Leads: Connect the red, yellow, and green test leads to the corresponding phases (L1/U, L2/V, L3/W) of the three-phase AC circuit you wish to test. Ensure secure connections using the alligator clips.
2. Observe Phase Check LEDs: All three orange LEDs (U, V, W) on the main unit should illuminate if all phases are present and within the operational voltage range. If any orange LED is off, it indicates an open phase condition.
3. Determine Phase Sequence:
   • If the Green LED (CW) illuminates and the buzzer emits an intermittent beep, the phase sequence is correct (clockwise rotation).
   • If the Red LED (CCW) illuminates and the buzzer emits a continuous beep, the phase sequence is reversed (counter-clockwise rotation).
4. Identify Open Phase:
   • If one of the orange phase LEDs (U, V, or W) is off, it indicates an open phase. In this scenario, both the green and red sequence LEDs will be off, and the buzzer will emit a continuous beep.
5. Disconnect: After testing, carefully disconnect the test leads from the circuit, starting with the highest voltage point.

Note: The device operates without internal batteries, drawing power directly from the tested circuit. Always ensure the circuit is live within the specified voltage range for the tester to function.

6. Maintenance

Proper maintenance ensures the longevity and accuracy of your SM852B tester.

• Cleaning: Wipe the device with a dry, soft cloth. Do not use abrasive cleaners or solvents.
• Storage: Store the tester in a cool, dry place, away from direct sunlight, high temperatures, and corrosive environments.
• Inspection: Regularly inspect the test leads and alligator clips for any signs of wear, cuts, or damage. Replace damaged components immediately.

7. Troubleshooting

If you encounter issues with your SM852B tester, refer to the following common problems and solutions:

8. Specifications

• Model: SM852B
• Operational Voltage: 60V ~ 600V AC (3 Phase)
• Measuring Frequency Range: 20Hz ~ 400Hz
• Continuous Use Time:
  • 60 minutes maximum at 60V AC
  • 4 minutes maximum at 600V AC
• Protection Level: 2000 V (impulse voltage 4000 V)
• Display Style: LED
• Power Source: Corded Electric (draws power from tested circuit)
• Item Weight: Approximately 200 Grams (7.1 ounces)
• Product Dimensions: 7.09 x 4.33 x 1.97 inches
• Upper Temperature Rating: 60 Degrees Celsius

9. Warranty and Support

For warranty information or technical support regarding your BESTDO SM852B 3 Phase Sequence Rotation Tester, please refer to the documentation provided at the time of purchase or contact BESTDO customer service directly. Keep your purchase receipt as proof of purchase.

For further assistance, please visit the official BESTDO website or contact your local distributor.