(1) Rotor inspection
Inspection of short circuit between rotor and ground. The resistance between the sliding ring 3 of rotor 1 and the shaft head of rotor 1 should be checked by resistance table 1 *K_. Otherwise, the short circuit of rotor coil should be replaced.
Inspection of breaking and short circuit of rotor coil. The resistance value between two slip rings 3 of rotor 1 should be between 2.8 and 3.0_when checking with 1 *_block of resistance meter 2. If the resistance value is in the range of k_, it means that the rotor 1 is open and the 400 kW diesel generator set is short-circuited if the resistance value is lower than the above value.
Inspection of rotor slip ring wear. Check the appearance of slip ring 3 and measure it with caliper 2. If the depth of wear scar exceeds 0.22mm, the rotor 1 or slip ring 3 should be replaced.
(2) Inspection of stator
Inspection of short circuit between stator coil and ground. Taking Jetta as an example, the resistance between the core 1 of the stator coil and the taps 2, 3 and 4 of the stator coil should be inspected one by one with the 1 *K_block of the resistance meter. If there is a small resistance value, it means that the stator coil is short-circuit to the ground, the stator coil should be replaced.
Stator coil circuit break check, check stator coil taps 1 and 2, 1 and 3, 2 and 3 one by one with 1 * _block of resistance meter, the value must be 0. If the measurement value is in the order of K_, the open circuit is marked and the stator should be changed.
(3) Inspection of Diode Board
Take Jetta as an example, using multi-purpose tester 5, while pressing resistance and voltage measurement buttons 8 and 9.
Detection positive diode: black terminal 6 is connected with positive radiator 1 (equivalent to B+) (positive diode negative), red terminal 7 is connected with node 2 (positive diode positive).
Detection negative diode: red terminal 7 is connected with negative radiator 3 (negative diode positive), black terminal 6 is connected with negative diode negative 2 (negative diode negative).
Detection excitation diode: black terminal 6 is connected to excitation terminal 4 (D+) (excitation diode negative pole), red terminal 7 is connected to node 2 (excitation diode positive pole) one by one.
All tests should be stopped three times, and the value should be 50-80_, otherwise the diode board will be replaced.
(4) Carbon Brush Inspection
Check the length of carbon brush 2 with caliper 1. The length of the standard value is 13 mm, and the application limit is 5 mm. If it exceeds the limit, it should be replaced.
(5) Voltage Regulator Inspection
When the battery is charged normally and the belt of the generator is tensioned normally, the regulator is removed from the generator when the speed of the starter is higher than the idle speed and the charging indicator is not extinguished. A conductor is used to connect the connecting post "F" and "1" of the conditioner, and then the conditioner is installed on the generator. At this time, the conditioner is in an abnormal state, starting the starter and improving the speed. If the charging indicator lights out, it means that the generator works normally. If the charging indicator is still on, it means that the fault is in the generator, not in the conditioner. When the conditioner breaks down, it should be replaced entirely.
(6) Bearing inspection
Check the damage condition of the bearing, if it is damaged, it should be replaced.
(7) Inspection of Generator Drive Belt
Check the V-belt condition and replace it immediately if the following defects are found:
Base cracks (cracks, core cracks, groove section cracks);
Location separation (cover layer, pull rope);
Base cracking; cable splitting;
Side wear (scatter line, side data damage, side hardening, side slippage, upper surface crack).
When the belt is placed on the pulley, there should be a gap between the inner diameter of the belt and the bottom of the pulley groove. If there is no gap, the belt must be replaced.