First, the power supply has electricity and the motor does not run.
1. The power cord is disconnected inside, and the plug and socket are in poor contact.
2. The speed regulator switch is out of order, the power is not turned on or the connection line is broken.
3. The brush is open, and the brush is stuck or severely worn out and comes out of contact with the commutator.
Maintenance method:
1. Check the power lead to replace the poorly connected plug and socket.
2. Open the bottom cover, check the speed regulator with a universal meter, repair the break, and replace the damaged parts, such as worn brushes.
Second, the motor does not reach the rated speed:
1. The power supply voltage is too low, and the power supply voltage is significantly slower than 190V.
2, the bearing damage is not flexible, or the oil in the bearing is dirty, causing the bearing to heat up and the friction resistance to increase.
3. Poor contact between the two brushes.
Maintenance method:
1. Find out the reason why the power supply voltage is too low. Use the power supply regulator to adjust the voltage to 220v. When the voltage reaches normal, use sandpaper to polish the commutator, so that the brush and the rectification are in good contact.
2, when the bearing is short of oil or dirt, it should be cleaned and then refueled, add butter or petrolatum. The amount of refueling is 1/3~3/2 of the bearing clearance. If the bearing is damaged, replace the bearing.
Third, the vibration is large when rotating, the centrifuge shakes back and forth, and the noise is large:
1. The bearing or bearing sleeve on the motor is seriously worn.
2. The main motor of the motor is bent at the upper end.
3, the load is unbalanced, the two tubes are asymmetrical, the casing weight is not equal, there are more broken glass in the casing, and the centrifugal tube sleeve is not suitable.
4. The rotor of the motor is not in the center of the magnetic field, that is, the gaps in the surrounding area are inconsistent or the deformation position of the cover is incorrect.
5. The motor and the bottom screw are loose, the shaft is not vertical, and the machine feet are not flat.
6. The centrifuge fixing screw with the shock absorbing spring is loose or the spring is broken.
Maintenance method:
1. Replace the new bearing or bushing.
2. Remove the spindle to straighten or replace the spindle.
3, the test tube and the casing must be balanced and weighed at the same time, high-speed centrifugal balance is more important. The centrifuge tube sleeve cannot be exchanged at will.
Fourth, long-term deactivation or cold weather can not start when the low speed:
1. The lubricating oil is solidified.
2. The lubricant deteriorates and sticks.
Maintenance method:
1. After power-on, you can use your hand to help start. After a period of high-speed operation, you can resume normal.
2. Clean the bearings and re-oil.
5. Causes of moisture and leakage:
1. The centrifuge is left unused for a long time, the indoor humidity is high, and the moisture is eroded.
2. The live part of the centrifuge is not well insulated from the machine casing or the insulation of the insulation is reduced after damp.
Maintenance method:
1. Centrifuges that are not used for a long time should be kept dry. Generally, they should be energized at least once a month for 15 minutes. It is found that there is moisture, and it can be continuously rotated for 2 hours to remove the moisture in the machine.
2. When the casing leaks, find the contact point between the live wire and the casing and replace the new one. The chassis should have a good grounding wire.
1. The power cord is disconnected inside, and the plug and socket are in poor contact.
2. The speed regulator switch is out of order, the power is not turned on or the connection line is broken.
3. The brush is open, and the brush is stuck or severely worn out and comes out of contact with the commutator.
Maintenance method:
1. Check the power lead to replace the poorly connected plug and socket.
2. Open the bottom cover, check the speed regulator with a universal meter, repair the break, and replace the damaged parts, such as worn brushes.
Second, the motor does not reach the rated speed:
1. The power supply voltage is too low, and the power supply voltage is significantly slower than 190V.
2, the bearing damage is not flexible, or the oil in the bearing is dirty, causing the bearing to heat up and the friction resistance to increase.
3. Poor contact between the two brushes.
Maintenance method:
1. Find out the reason why the power supply voltage is too low. Use the power supply regulator to adjust the voltage to 220v. When the voltage reaches normal, use sandpaper to polish the commutator, so that the brush and the rectification are in good contact.
2, when the bearing is short of oil or dirt, it should be cleaned and then refueled, add butter or petrolatum. The amount of refueling is 1/3~3/2 of the bearing clearance. If the bearing is damaged, replace the bearing.
Third, the vibration is large when rotating, the centrifuge shakes back and forth, and the noise is large:
1. The bearing or bearing sleeve on the motor is seriously worn.
2. The main motor of the motor is bent at the upper end.
3, the load is unbalanced, the two tubes are asymmetrical, the casing weight is not equal, there are more broken glass in the casing, and the centrifugal tube sleeve is not suitable.
4. The rotor of the motor is not in the center of the magnetic field, that is, the gaps in the surrounding area are inconsistent or the deformation position of the cover is incorrect.
5. The motor and the bottom screw are loose, the shaft is not vertical, and the machine feet are not flat.
6. The centrifuge fixing screw with the shock absorbing spring is loose or the spring is broken.
Maintenance method:
1. Replace the new bearing or bushing.
2. Remove the spindle to straighten or replace the spindle.
3, the test tube and the casing must be balanced and weighed at the same time, high-speed centrifugal balance is more important. The centrifuge tube sleeve cannot be exchanged at will.
Fourth, long-term deactivation or cold weather can not start when the low speed:
1. The lubricating oil is solidified.
2. The lubricant deteriorates and sticks.
Maintenance method:
1. After power-on, you can use your hand to help start. After a period of high-speed operation, you can resume normal.
2. Clean the bearings and re-oil.
5. Causes of moisture and leakage:
1. The centrifuge is left unused for a long time, the indoor humidity is high, and the moisture is eroded.
2. The live part of the centrifuge is not well insulated from the machine casing or the insulation of the insulation is reduced after damp.
Maintenance method:
1. Centrifuges that are not used for a long time should be kept dry. Generally, they should be energized at least once a month for 15 minutes. It is found that there is moisture, and it can be continuously rotated for 2 hours to remove the moisture in the machine.
2. When the casing leaks, find the contact point between the live wire and the casing and replace the new one. The chassis should have a good grounding wire.
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