Cover UEZ — plastic or metal, with a height of 30 mm. on the one hand it is fixed nut of the switch ЅА1, and on the other two long screws (posts) that are used for simultaneous fastening of the clamp “M”, petals 3 and 7. The shroud should cover the circuit Board and a few hung from it to protect the device from water or oil. For cooling the radiator of the transistor VT1 in the Board and in the upper part of the lateral side of the casing adjacent to the radiator from the output “PR”, drilled a few holes.
Electronic ignition is not critical to the possible location details, and its design can be
any. However, when mounting the UEZ note that the radiator of the transistor VT1, findings “B”, “PR” and “1” are energized, so they need to put on the vinyl chloride pipe.
Connecting to a switch SA1 and the emitter of the transistor VT7 petals, you can use wire of 0.5 mm2. Wiring diagrams UEZ to the ignition system of a car with coils B-117 and B-115 are shown in figure 5. The wire from B-115 V going to the starter relay, unplug it from the ignition coil.
The details of the UEZ. All resistors are of MLT type. The diode VD3 must have a valid reverse voltage of At least 350 V and direct current of at least 100mA. Capacitors C2 and NW — K53-1 with an operating voltage of 15 V. it is Possible to use a capacitor K53-4 and others, capable of operating at temperatures -40°C… +70°C. C1 — K53-1A, K53-4, better metalloboranes MBGP, MBGC.
As transistor VT2 can be used КТ503, КТВ15, and instead КТВ09А — КТ704А (IN). Instead of the R2 resistor it is better to install a lamp SM-37, which will allow to control the operation of the UEZ, breaker contacts, and will serve as an indicator for setting initial ignition timing. In addition to SM-37 you can use the switch the light bulb on 24 V with currents up to 100 mA.
Prior to the installation of the UEZ on the car, you should check it under current. For this to terminals “B” and “M” are connected with the correct polarity, the power source voltage of 6-12 V, and to the terminals “B” and “1” — a control lamp on 12 In with power not exceeding 5 watts. If there are no errors in the installation of it should not burn. Then, periodically closing between terminals “PR” and “M”, we see that for any position of the switch ЅА1 test lamp illuminates to the beat of a circuit these terminals.
Install ЅА1 switch to position “a”. Hold in a closed state of terminal “PR” and “M”, we see that the test lamp, flushing, begins relatively slow to fade. After that, the UEZ can be installed on the car. The engine will operate normally. If, however, with the increase in revs it does not, it indicates excessive air gap between the contact plates of the circuit breaker and it must be slightly reduced.
To ensure a long reliable operation desirable full scan UEZ. It is carried out in the following sequence:
1. Include ammeter DC at 5 amps to the circuit wire coming from ignition switch to terminal “B” of ignition coil (it must be connected and terminal “B” UEZ). БА1 switch is set to the “electronic ignition”.
2. Include ignition and be convinced that the ammeter will show the inrush current to about 3 And then decrease to 0.05—0.1 A (in the presence of leakage of the capacitor C2, this current can be larger than 0.1 A, but should not exceed 1.1 A). If the current subsides, then immediately turn the ignition off — UEZ faulty. When the inrush current is not, rotate the crankshaft a little (contact breaker could be disconnected). With a weak throwing current it is necessary to reduce the resistance of the resistor R6.
3. Start the engine and measure the current consumed by the ignition system. If the current exceeds 1.1 A, it save a slight increase of the gap of the contact system of the interrupter. Warm up the engine.
4. Increasing the engine speed, monitor the readings of the ammeter. The current may initially increase, but not to exceed 1.1 a, And then decrease to 0.6—0.7 A. If the current is less than 0.6 A, you should increase the resistance of the resistor 1?1 (22 to 27 n), despite the fact that the engine can stably run on all RPMs. In the operation of the UEZ no adjustment, is not required.
To use UEZ motorcycle recommended:
1. To reduce the resistances of the resistors twice, and resistor R5 to 1.5 kω.
2. Of capacitors to increase two times.
3. To measure the current flowing through the primary winding of the coil (transformer) ignition at high engine speeds in conventional ignition.
4. Install on the motorcycle UEZ and make him monitor and adjust similarly performed on the car. In this case you may need to change the capacitance of the capacitor C1.
Flowing from the ignition switch to the coil current must not exceed 1.1 A. When the power supply 6 can be used In the chip К149КТ1Б.
The transistor version of the UEZ is significantly simplified if to exclude from the scheme switch 5А1 and elements that provide delayed unlocking of the transistors UT2 and ERD. A schematic diagram of a simplified circuit Board of electronic ignition in figures 6 and 7.
The disadvantages of such a UEZ are the need to dismantle during the transition to normal ignition; a more loaded mode of operation of transistors, as well as the fact that the average current flowing through the ignition coil when the engine is running, almost the same as in the normal ignition. This does not exclude heating of the ignition coil. However, a minimum of parts, simplicity of construction and the independence of the device characteristics by the clearance between the contact plate of the interrupter still have a number of advantages of UEZ in front of the previous one.
B. TRUTNOV, Kharkov