DBF2-7Q8TH side blowing bottom blowing transformer cooling axial fan

DBF2-7Q8TH side blowing bottom blowing transformer cooling axial fan

4. Product model and technical parameters (see Appendix 1)

DBF2-7Q8TH side blowing bottom blowing transformer cooling axial fan

5.2.1 Appearance inspection before installation: Check whether the fasteners are loose, whether the blades are deformed, whether the rotation is smooth, and whether the letters U, V, and W on the outlet end correspond to the phase sequence of the power supply. If any abnormalities are found, corrective measures should be taken.

5.2.2 Use a 500V megohmmeter to test the thermal insulation resistance of the stator winding to the casing, and the resistance value should not be less than 1M Ω. If the resistance is low due to insulation moisture, it should be dried.

5.2.3 Conduct an idle operation test on the motor according to the prescribed power supply (without impeller). The motor should start flexibly, run smoothly and lightly, and produce harmonious sound. When the three-phase power supply is balanced, the deviation between any phase and the average value of the three-phase no-load current of the motor should not exceed 10% of the average value of the three-phase.

5.2.4 Connect the whole machine to the power supply for trial operation, check the rotation direction and operation condition. After the test is normal, it can be put into operation.



5.3.3 If the shutdown time is long and needs to be restarted, it is necessary to ensure that there are no foreign objects in the airflow channel and air duct, and then move the impeller for inspection. After the power supply line and other components are normal, it can be put back into operation.

5.3.4 When the parking time is long or the motor is severely affected by moisture and the insulation resistance is low, it should be dried before being put into operation.

5.3.5 When disassembling and repairing the machine, the residue such as lubricating grease should be cleaned first, and all bearings should be thoroughly cleaned and inspected. Discovering faults should be dealt with promptly (refer to the table of common faults and handling methods). If the winding is rewound, a withstand voltage test should be conducted. The new winding should be able to withstand an AC voltage of 2000V for 1 minute without breakdown. For factory products, when the user requests a repeated withstand voltage test, the test voltage should be 1600V and the time should be 1 minute. If *, reassemble and add new lubricating grease.

5.3.6 Regularly replenish lubricating grease: Fully sealed bearings do not need to replace lubricating grease within 5 years. For non fully sealed bearings, the oil cup should be cleaned before oil injection; This product uses lithium based grease and cannot be replaced with other grease at will; Inject lubricating oil into the oil cup with an oil gun, with an amount of about 2/3 of the bearing space. It should be added every 2-3 years during normal use.



Common faults and their solutions

serial number
Fault phenomenon
Possible causes
treatment method
1
Temperature too high
1. Blockage of the intake passage or foreign objects in the air duct causing excessive load;
2. The impeller is severely deformed or damaged;
3. The power supply voltage or frequency is too low and does not comply with regulations;
4 single-phase operation;
Friction between the fixed rotor and other rotating components.
1. Remove foreign objects to ensure smooth air intake;
2. Replace the impeller;
Replace the motor with one that meets the user's voltage and frequency level;
4. Eliminate faults in fuses and motor windings;
5. Adjust the installation again.
2
excessive current
1. The bearing is severely worn;
2. Single phase operation of motor winding;
The impeller and air duct are stuck;
The voltage or frequency does not match.
1. Replace the bearing;
2. Eliminate circuit or winding open circuit faults;
Adjust the clearance between the impeller and the air duct;
4. Check if the voltage or frequency matches the motor.
3
Large noise and vibration
1. The impeller is severely damaged;
Two feet are loose.
1. Replace the impeller;
Tighten the loose parts.

6.3 The storage location should be kept ventilated, dry, clean, and free of corrosive gases. During storage and transportation, rain protection measures should be taken.

6.4 If it is not immediately put into operation, it is not advisable to open the box immediately. If the packaging box is damaged, it should be opened for inspection and handled properly.

7. Ordering Instructions

7.1 When placing an order, please provide detailed information on the product model, technical parameters, and installation structure type.

When ordering accessories, please specify the machine model, accessory name, and specifications.

7.3 The technical parameters and installation dimensions in this manual are for user reference only. If there are any changes in the data, the agreement between the supply and demand parties shall prevail and shall not be corrected.

7.4 If there are special requirements, special specifications and models of products can be supplied after mutual agreement.