FAQ
Alternator(generator) Maintenance and overhaul
Alternator Maintenance and overhaul
1. Maintenance
a. Alternator should be installed in the dry,clean,ventilating place,and to prevent the direct contact of wind driven dirt, rain,snow and sunlight
b. Take note of the ventilation and heating of alternator at times, and the current and voltage don’t exceed the rating data.
c. The alternator should not be operated at the place that full of water vapor,dust and flammable gas
d. In general,maintenance intervals will depend upon operating conditions. Routine overhaul should be made freqently
2. Major overhaul
a. Measure insulating resistance with 500V megohm meter, If the reading is less than 2MΩ,the alternator should be dried,(Must disconnect AVR. With generator during measuring)
b. Replace the grease in bearing housing,and clean the surface of two shield bearing or replace the bearing
c. Clean the interior of alternator by blowing and take care of the all junctions
d. Inspect all living parts, and make sure joint nut tight and contact well.
3. Overhaul attention.
a. Take care of the disassembled parts, and avoid to bump each other or mising
b. Should lightly place main parts such as rotor,stator,bracket,etc. To prevent damage.
c. In order to reassemble easily, should make the mark for the disconnected wiring, and avoid wrong connecting.
d. Disassembled bearing and bearing cap should be covered by clean paper to prevent dirt, and replace the dirty grease.
e. After the alternator reassembled, rotate the rotor slowly, ensure there are not abnormal sound and halt.
f. The bracket screws should be driven crosswise, can’t drive the screws one by one.
Thyristor or SCR loading
Solid state electronic control devices which utilize thyristor or SCR firing circuits(such as variable freqency induction motor control precision motor speed controls, no break powered battery charges etc.) may introduce high freqency harmonics which adversely affect, or totally distort the normal wave form of alternator. This creates additional heat in the alternator windings and may cause the alternator to overheat. Problems which can occur are not limited to the alternator. Poor wave shape may adversely effect the thyristor devices, the equipment their power, and other connected load. Please contact the factory for application assistance.
Notice;
1. AVR wiring can’t be connected wrong
2. Boost exciting must use the “12V” battery, and the alternator must be stopped. Using”24V” battery or boosting the excitation in rotating, the AVR would be damaged.
3. The alternator runs at “50HZ” or “60HZ”, should ensure the wiring right, or maybe affect AVR. Working.
4. Before shut down the generating set, first turn off the output switch, then speed down the engine.
5. Take care of the contact of the plug and sockets, ensure them close contacting each other.
6. If the alternator can’t built up, first of all, look for the couses, such as : fuse,wirings, residue voltage,etc. Please don’t adjust the potentiometer and boosting excitation before known the causes.
7. If the engine runs at idle speed, please don’t adjust the potentiometer and boost excitation.
8. Adjusting the voltage and stability potentiometer, please use small screw-driver and rotate slowly.
1. Maintenance
a. Alternator should be installed in the dry,clean,ventilating place,and to prevent the direct contact of wind driven dirt, rain,snow and sunlight
b. Take note of the ventilation and heating of alternator at times, and the current and voltage don’t exceed the rating data.
c. The alternator should not be operated at the place that full of water vapor,dust and flammable gas
d. In general,maintenance intervals will depend upon operating conditions. Routine overhaul should be made freqently
2. Major overhaul
a. Measure insulating resistance with 500V megohm meter, If the reading is less than 2MΩ,the alternator should be dried,(Must disconnect AVR. With generator during measuring)
b. Replace the grease in bearing housing,and clean the surface of two shield bearing or replace the bearing
c. Clean the interior of alternator by blowing and take care of the all junctions
d. Inspect all living parts, and make sure joint nut tight and contact well.
3. Overhaul attention.
a. Take care of the disassembled parts, and avoid to bump each other or mising
b. Should lightly place main parts such as rotor,stator,bracket,etc. To prevent damage.
c. In order to reassemble easily, should make the mark for the disconnected wiring, and avoid wrong connecting.
d. Disassembled bearing and bearing cap should be covered by clean paper to prevent dirt, and replace the dirty grease.
e. After the alternator reassembled, rotate the rotor slowly, ensure there are not abnormal sound and halt.
f. The bracket screws should be driven crosswise, can’t drive the screws one by one.
Thyristor or SCR loading
Solid state electronic control devices which utilize thyristor or SCR firing circuits(such as variable freqency induction motor control precision motor speed controls, no break powered battery charges etc.) may introduce high freqency harmonics which adversely affect, or totally distort the normal wave form of alternator. This creates additional heat in the alternator windings and may cause the alternator to overheat. Problems which can occur are not limited to the alternator. Poor wave shape may adversely effect the thyristor devices, the equipment their power, and other connected load. Please contact the factory for application assistance.
Notice;
1. AVR wiring can’t be connected wrong
2. Boost exciting must use the “12V” battery, and the alternator must be stopped. Using”24V” battery or boosting the excitation in rotating, the AVR would be damaged.
3. The alternator runs at “50HZ” or “60HZ”, should ensure the wiring right, or maybe affect AVR. Working.
4. Before shut down the generating set, first turn off the output switch, then speed down the engine.
5. Take care of the contact of the plug and sockets, ensure them close contacting each other.
6. If the alternator can’t built up, first of all, look for the couses, such as : fuse,wirings, residue voltage,etc. Please don’t adjust the potentiometer and boosting excitation before known the causes.
7. If the engine runs at idle speed, please don’t adjust the potentiometer and boost excitation.
8. Adjusting the voltage and stability potentiometer, please use small screw-driver and rotate slowly.