Voltage regulator — check and adjustment on the stand

Data for checking and adjusting

• Adjustable voltage at regulator and ambient temperature of 50±3°С, V:
• at the second stage — 14.2±0.3
• at the first stage is lower than at the second, no more than - 0.7
• Resistance between plug «15» and «weight», Ohm — 27.7±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 2nd 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 that can change the speed over a wide range. The regulator with a closed lid is installed on the stand with the plugs down.

The diagram of the electrical connections of the stand is shown in fig. 7-12. Pay particular attention to the tightness of the connections so that their resistance does not exceed the values shown in Table 7-4.

Table 7-4. The maximum value of the ohmic resistance of the connections

Connections	Resistance, Ohm
«30» generator - «plus» batteries	0.005
«weight» generator - «minus» batteries	0.001
«30» generator - «15» regulator	0.02
«67» generator - «67» regulator	0.02
«weight» generator - «weight» regulator	0.02

It is necessary that the wires from switch 3 are connected directly to the clamp «30» generator and plug «15» regulator, and «weight» regulator connected directly to «weight» generator. All connecting wires should be as short as possible. If tray wiring is used (wires are arranged in tubes or trays), then the trays must be made of non-magnetic material.

During control checks on the bench, do not allow the regulator to operate with the battery disconnected, as this may damage the regulator contacts.

Light bulbs 6 control the health of the generator and during its operation must have the same glow.

Before checking, warm up the regulator in a thermostat for 5-18 minutes at 50±3°C, supplying the regulator winding with a current at a voltage of 12-13 V. The voltage is set by a rheostat 9 with switches 3, 7, 8 on and the generator off.

Immediately after warming up, check and adjust.

Second stage control. Set the generator rotor speed to 5000 min^-1. Using rheostat 9, set the generator load current to 2-12 A. Check the generator voltage, which should be 14.2±0.3 V. If it differs, stop the generator, disconnect the battery, remove the cover from the regulator and, bending the bracket 12 (rice. 7-10), loosen (if high voltage) or increase (if low voltage) spring tension 11. Then replace the regulator cover and check the second stage voltage again.


After adjusting the second stage, check the first stage immediately.

First stage control. At a generator rotor speed of 5000 min1 with a rheostat 9 (pic. 7-12) set the load current to 25-35 A. In this case, the voltage value should be no more than 0.7 V lower than the value obtained when adjusting the second stage.

Note. When checking both the first and second stages, make sure that the adjusted voltage is stable, i.e. does not fluctuate sharply.

If the voltage does not fall within these limits, then stop the generator, disconnect the battery, remove the regulator cover, loosen the nut 6 (rice. 7-10) and move the column 8 by 0.1-0.2 mm.

If the voltage is high, the rack moves down, and if it is low, it moves up. At the same time, the rack 7 is shifted to maintain a gap of 0.45±0.1 mm between the contacts of the second stage. During this operation, make sure that the axes of the contacts of the first and second stages coincide. The armature contact must not extend beyond the contacts on the uprights.

Tighten nut 6, replace the cover, check the regulator again (both first and second stage), and repeat the operations if necessary.

Clean the regulator cap thoroughly after adjustment and place it on the hot regulator to minimize moisture absorption.