How to Make a Smooth Start on an Angle Grinder
Many power tools fail due to engine wear. Modern models of grinders have a soft starter. Due to him, they are ways to work out for a long time. The principle of operation of the element is based on a change in the operating frequency. In order to learn more about the starter, it is worth considering the scheme of the standard model.
The standard soft starter angular grinder consists of a triac, rectification unit and a set of capacitors. To increase the operating frequency, resistors are used that pass current in one direction. The starter is protected by a compact filter. The rated voltage of the models is maintained low. However, in this case, much depends on the maximum power of the motor, which is installed in an angle grinder.
How to connect a model?
Connecting a soft start angle grinder through an adapter. Its input contacts are connected to the rectifier unit. It is important to determine the zero phase in the device. To fix the contacts you will need a blowtorch. Check the starter through the tester. First of all, negative resistance is determined. When installing the starter, it is important to remember the threshold voltage that the device can withstand.
Device diagram for angle grinder with triac 10 A
The soft start circuit of a self-made angle grinder, involves the use of contact resistors. The polarity coefficient of the modifications, as a rule, does not exceed 55%. Many models are made with locks. A wired filter is responsible for protecting the device. To pass current, low frequency transceivers are used. The process of lowering the threshold voltage is carried out on a transistor. The triac in this case acts as a stabilizer. When connecting the model, the output impedance with an overload of 10 A should be about 55 ohms. The starter plates are semiconductor based. In some cases, magnetic transceivers are installed. They cope well with low revs and can support the rated frequency.
Model for grinders with triac on 15 A
Soft start for an angle grinder with 15 A triacs is universal and is often found in low power models. The difference between devices is low conductivity. Scheme (device) for soft start angle grinder involves the use of contact-type transceivers that operate at a frequency of 40 Hz. Many models use comparators. These elements are set with filters. The rated voltage for starters starts at 200 V.
Starters for grinders with a triac on 20 A
Devices with 20 A triacs are suitable for professional grinders. Many models use contactor resistors. First of all, they are able to work at high frequency. The maximum temperature of the starters is 55 degrees. Most models have a well-protected case. The standard scheme of the device involves the use of three contactors with a capacitance of 30 pF or more. Experts say that devices stand out for their conductivity.
The minimum frequency for starters is 35 Hz. They are able to work in a direct current network. Modifications are connected via adapters. For 200 W motors, such devices are well suited. Filters are often installed with triodes. The sensitivity indicator for them is not more than 300 mV. Quite often there are wired comparators with a protection system. If we consider imported models, then they have an integrated converter, which is installed with insulators. Current conductivity is provided at around 5 microns. With a resistance of 40 ohms, the model is able to stably maintain high speeds.
Video: How to Make a Smooth Start on an Angle Grinder
600 W Angle Grinder Models
For 600 W grinders, starters with contact triacs are used, in which the overload does not exceed 10 A. It is also worth noting that there are many devices with plates. They are distinguished by security and are not afraid of high temperature. The minimum frequency for grinders at 600 W is 30 Hz. In this case, the resistance depends on the installed triode. If it is used of linear type, then the above parameter does not exceed 50 Ohms.
If we talk about duplex triodes, then the resistance at high speeds can reach 80 Ohms. Very rarely, models have stabilizers that work from comparators. Most often, they are attached directly to the modules. Some modifications are made with wire transistors. They have a minimum frequency starts from 5 Hz. They are afraid of overloads, but are able to maintain high speed at a voltage of 220 V.
Devices for grinders at 800 watts
800 W angle grinder works with low frequency starters. Triacs are often used at 15 A. If we talk about the model circuit, then it is worth noting that they use expansion transistors, in which the current throughput starts at 45 microns. Capacitors are used with and without filters, and the capacitance of the elements is no more than 3 pF. It is also worth noting that starters differ in sensitivity.
If we consider a professional angle grinder, then modifications for 400 mV are suitable for them. In this case, the current conductivity may be low. There are also devices with variable transistors. They quickly warm up, but they are not able to maintain high speeds with an angle grinder, and their current conductivity is about 4 microns. If we talk about other parameters, then the nominal voltage starts from 230 V. The minimum frequency for models with broadband triacs is 55 Hz.
Starters for grinders 1000 W
Actuators for these grinders are manufactured on triacs with an overload of 20 A. The standard circuit of the device includes a triode, a stabilizer plate and three transistors. The rectifier unit is most often mounted on a wired basis. Capacitors can be used with or without a filter. The minimum frequency of a conventional model is 30 Hz. With a resistance of 40 ohms, starters are capable of supporting large overloads. However, problems may occur at low revolutions of the angle grinder.
How to make a starter with a triac TS-122-25?
Making a smooth start with the TS-122-25 simistor for a do-it-yourself angle grinder is quite simple. First of all, it is recommended to prepare a contactor resistor. Capacitors will require a single pole type. In total, three elements are installed in the starter. The capacitance of one capacitor should not exceed 5 pF. To increase the operating frequency, the contactor on the plate is soldered. Some experts say that it is possible to increase conductivity due to filters.
The rectifier unit is used with conductivity from 50 microns. It is able to withstand large overloads and can provide high speeds. Next, to assemble a smooth start on an angle grinder with your own hands, a thyristor is installed. At the end of the work, the model is connected through an adapter.
Assembly of the model with triacs of the VS1 series
To assemble on the triac VS1 a soft start for an angle grinder with your own hands, you can use several rectifier blocks. Capacitors for the device are suitable for linear type with capacitance from 40 pF. To start assembling the modification is soldering resistors. Capacitors are installed in series between insulators. The rated voltage of a high-quality starter is 200 V.
Next, to make a soft start for the angle grinder with your own hands, a prepared triac is taken and soldered at the beginning of the chain. The minimum operating frequency should be 30 Hz. In this case, the tester must display a value of 50 ohms. If there are problems with overheating of the capacitors, then you need to use dipole filters.
Model for grinders with regulator КР1182ПМ1
To assemble a soft start with the KR1182PM1 regulator for an angle grinder with your own hands, a contact thyristor and a rectifier block are taken. The triode is more appropriate to apply to two filters. It is also worth noting that three capacitors with a capacitance of at least 40 pF will be required to assemble the starter.
The sensitivity index of the elements must be 300 mV. Experts say that the triac can be installed behind the lining. It should also be remembered that the threshold voltage should not fall below 200 V. Otherwise, the model will not be able to work with reduced speed angle grinder.