Scheme for checking the voltage regulator on the stand
1 - voltmeter with a scale of 15 V, accuracy class not lower than 0.5; 2 – main switch; 3 - voltage regulator; 4 - generator; 5 – ammeter with scale up to 50 A; 6 - control lamps of 3 W, 12 V; 7 – rheostat 5–30 A, 15 W; 8 - rheostat switch; 9 - battery switch; 10 - battery
Data for checking and adjusting
Regulated voltage at regulator and ambient temperature (50±3) °C, V: | |
- at the second stage | 14,2 ± 0,3 |
- at the first stage lower than at the second, no more | 0,7 |
Resistance between plug «15» and mass, Ohm | 17,7 ± 2 |
Resistance between plug «15» and plug «67» with open contacts, Ohm | 5,65 ± 0,3 |
Air gap between armature and core, mm | 1,4 ± 0,07 |
Distance between contacts of the second stage, mm | 0,45 ± 0,1 |
The regulator is checked and adjusted on a stand that has a generator, a battery, a thermostat and an electric motor with an adjustable speed over a wide range. The regulator with a closed cover is installed on the stand with the plugs down.
The diagram of the electrical connections of the stand is shown in fig. Scheme for checking the voltage regulator on the stand.
Pay special attention to the reliability and minimum resistance of the wire connections so that the wires from switch 2 are connected directly to the clamp «30» generator and plug «15» regulator, and the regulator housing - directly with the generator housing. All wires should be as short as possible.
During control checks on the stand, do not allow the regulator to operate with the battery disconnected, as this can damage the regulator contacts. Light bulbs 6 control the operation of the generator and, if it is working, should have the same glow.
1. Before checking, warm up the regulator in a thermostat for 15–18 minutes at (50±3) °С, supplying the regulator winding with current at a voltage of 12–13 V. The voltage is set by rheostat 7 with switches 2, 8, 9 on and the generator not running.
2. Immediately after warming up, they begin to check and adjust the 2nd, and then the 1st stage and make sure that the adjusted voltage is stable, i.e. did not fluctuate sharply.
2nd stage control
3. Set the generator rotor speed to 5000 min–1.
4. Using rheostat 7, set the generator load current to 2–12 A.
5. Check the generator voltage, which should be (14,2±0,3) IN.
6. If it differs, stop the generator, disconnect the battery, remove the cover from the regulator and, bending the spring bracket 10 (see fig. Voltage regulator PP-380), loosen (if the voltage is high), or increase (if low voltage) her tension.
7. Then replace the regulator cover and check the 2nd stage voltage again.
8. After completing the check and adjustment of the 2nd stage, immediately check the 1st stage of regulation.
1st stage control
9. At a rotor speed of 5000 min–1 rheostat 7 (see fig. Scheme for checking the voltage regulator on the stand) set the load current to 25-35 A. In this case, the voltage should be no more than 0.7 V lower than the value obtained when adjusting the 2nd stage.
10. If the voltage does not fall within these limits, then stop the generator, disconnect the battery, remove the regulator cover, loosen the nut 4 (see fig. Voltage regulator PP-380) and move column 6 by 0.1–0.2 mm.
11. When the voltage is increased, the rack is shifted down, and if it is low, it is moved up. At the same time, move column 5 to maintain clearance (0,45±0,1) mm between 2nd stage contacts. During this operation, make sure that the axes of the contacts of the 1st and 2nd stages coincide. The armature contact must not extend beyond the contacts on the uprights.
12. Tighten nut 4, replace the cover, check the regulator again (both 1st and 2nd stage) and, if necessary, repeat the operations until fine adjustment is obtained.
13. After adjustment is complete, thoroughly clean the regulator cover and place on the hot regulator to minimize moisture absorption.