General information:

The multifunctional voltage regulator 7931.3702-01 is purposed for voltage maintenance of the onboard vehicle network in predetermined limits in all system operation modes of electrical equipment at change of the rotation frequency of the alternator rotor, electrical load and environment temperature.

Applicability: automobiles VAZ-2110, VAZ-2111, VAZ-2112, with the alternator 9402.3701-03, VAZ-2123 “Chevrolet Niva” with the alternator 9402.3701-04 and others.

Multifunctional voltage regulator 7931.3702-01 ensure complete switching-off of the alternator’s field winding from the onboard network, thus increasing the reliability and safety of the vehicle power-supply system.

The voltage regulator 7931.3702-01 has a function of indication of the on-board network reduced/increased voltage and the alternator's low phase voltage. The indication is realized by glowing of the indicator lamp controlling the battery loading on the instrument cluster. The item ensures the fulfilment of a function of fading in current load. The regulator realizes also a function of protection against short-circuit in the output and indicator circuit. The regulator is made with the usage of a modern microcontroller and by certain parameters it has no equal among large-series produced items.

The voltage control and regulation are performed directly on the alternator’s output terminal - on this principle all power supply diagrams of modern foreign automobiles of high class are built. Additional diodes in the rectifier unit are absent, the control of alternator’s start-up and control of its rotation frequency is made directly on one of the output power control windings.

The regulator is produced in a single climatic design О2.1 in accordance with GOST 15150 for internal market and for export. On protection degree against penetration of foreign bodies and water, the item meets design IP67 in accordance with GOST 14254. An operating mode of the regulator is S1 in accordance with GOST 3940.

The regulator is mounted directly on the alternator where the setting of regulators 7931.3702И4 ЩР-3, 7931.3702И4 ЩР3-01 or 7931.3702-01 with the help of standard screws is stipulated.

The warranty period of exploitation is 3 years from the date of commissioning or from the date of sale in retail commercial network. The warranty obligations of the manufacturer are valid during 4 years from the date of the item production. The date of production is marked on the item housing.

Specifications:

Range of operating temperatures, °С -40 .. +110   Regulating voltage with battery at t°=(25 ± 2)°С and load of alternator 5A, V 14,7 ± 0,1   Regulating voltage with battery at t°=(25 ± 2)°С in range of alternator load from 5A to 0,9· Imax* , V 14,7 ± 0,15   Maximum current of output circuit, A 5,0   Thermal compensation of regulating voltage, mV/°C -7 ± 1,5   Residual voltage on output "DF": maximal / typical, V 0,08 / 0,07   Low phase voltage indication threshold, V 3,75 .. 7,25   Reduced voltage indication threshold, V 10,9 .. 11,6   Increased voltage indication threshold, V 16,15 .. 17,15   Maximum allowable long-term influence of increased supply voltage, V 18,0   Maximum allowable influence of increased supply voltage up to 5 min., V 25,0   Maximum allowable pulse overvoltages in accordance with GOST 28751, V 200,0

Connection diagram:

Dimensional drawing: