fuyangby@126.com
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fuyangby@126.com
86 15188770013
The parameter setting and adjustment in the commissioning of slurry pumps should focus on key items such as motor direction, impeller clearance, frequency converter, and lubrication status to ensure safe and efficient operation of the equipment.
The slurry pump must undergo systematic debugging before starting to verify its mechanical performance, sealing, electrical control, and operational stability. Correct parameter settings can not only prevent faults such as cavitation and overload, but also extend the lifespan of overcurrent components. Debugging is mainly based on the requirements of the working conditions and the characteristics of the pump type, involving coordination from multiple aspects such as mechanical, electrical, and control systems.
Core parameter setting and adjustment methods
1. Motor direction confirmation
It is necessary to ensure that the direction of the drive motor is consistent with the specified direction of the pump (usually clockwise, facing the fan end of the motor). Reverse rotation can cause the impeller to loosen or be damaged.
When adjusting, the coupling should be disconnected first, and the motor rotation should be tested separately to confirm that it is correct before connecting.
2. Adjustment of clearance between impeller and front guard plate
To maintain high efficiency, it is necessary to regularly control the gap between the impeller and the front guard plate within the range of 0.75-1.00mm (small value for small pumps, large value for large pumps).
When there is a slow decrease in current during operation, it indicates that the gap has increased and should be adjusted in a timely manner.
3. Parameter setting of frequency converter (applicable to slurry pumps equipped with frequency converter control)
Before starting, the frequency of the frequency converter should be set to less than 10%. After the outlet valve is fully opened, gradually increase the frequency to avoid instantaneous overload.
If PID constant pressure water supply control is adopted, the following key parameters need to be set:
F0.03=1: Enable PID control mode;
F5.04: Set the target pressure value (such as 0.3MPa);
F5.01~F5.03: Adjust the proportional (P), integral (I), and derivative (D) parameters to stabilize the pressure output.
4. Lubrication and sealing parameter inspection
Add oil to the bearing box to the centerline of the oil mark, and it is recommended to use L-CKD320 lubricating oil 1;
The packing seal should be uniformly tightened on the gland to allow the liquid to leak in droplets (about 30-60 drops per minute), while monitoring the temperature rise of the packing box;
Mechanical seals need to ensure smooth flushing water flow. When parking, stop the pump first and then turn off the flushing liquid.
5. Dynamic parameter monitoring during operation
Import pressure: ≥ -0.03 MPa. If it is too low, it may cause cavitation, and the suction port needs to be checked for blockage.
Export pressure: ≤ 0.8 MPa. If overpressure occurs, pipeline blockage or valve closure should be checked.
Lower limit of flow regulation: ≥ 30% of the design flow to prevent high temperature rise and increased vibration caused by low flow operation.
Bearing temperature: ≤ 75 ℃. If it exceeds the temperature limit, check the lubrication status or heat dissipation conditions.
Flow control can be achieved through valve throttling, variable speed regulation (such as variable frequency), bypass reflux, and other methods, among which variable frequency speed regulation is the most energy-efficient.
suggestion
Preparation before debugging: Check that the anchor bolts are tightened, the pipeline connections are secure, the lubricant is properly added, and ensure that the pump chamber is filled with liquid. It is strictly prohibited to run without water.
Start sequence: First turn on the disruptor (if any) → open the inlet valve → start the motor → slowly open the outlet valve and adjust the frequency to the desired operating condition.
Record maintenance: Establish operation logs to record running hours, packing replacement, lubrication addition, etc., for easy maintenance and analysis in the later stage.
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(Editor in charge: Slurry Pump https://www.fuyangpumps.com/)
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