How to check the condenser with multimeter
Greetings to all friends and readers of the Electrician in the House website. I think everyone knows what a condenser is. If you have not seen this element of the chips, you have definitely heard about it. The most frequent reason of malfunction in radio electronics is the damage of exactly this element. Modern household appliances are “stuffed” with electronics and the breakage of such tiny detail leads to the loss of functionality of the whole mechanism.
To determine which particular capacitor in the circuit failed they need to check for performance. And it is desirable to do this with the help of electronic devices, because visual inspection does not give a conclusion about the fault.
We will do it using an inexpensive and functional device. multimeter. In the last article I wrote about how you can use it to check the resistance, and today we will consider how to check the capacitor with a multimeter.
To write this article I was asked by one of my subscribers. As always I will try to present the material in an accessible way, but if there are any questions, please do not hesitate to ask them in the Комментарии и мнения владельцев.
Condenser fan motor and capacitor replacement
Checking inrush and run capacitors
You can check the capacitor with a capacitor capacity meter, such devices are available both separately and as part of a multimeter, a universal device that can measure many parameters. Let’s check with multimeter.
- Disconnect conditioner
- Discharge the capacitor by short-circuiting its pins
- Remove one of the terminals (any terminal)
- set the device to measure the capacitors capacity
- touch the probes to the pins of the capacitor
- Read off the capacitance value from the screen
All devices have different symbols for capacitor measurement modes, the basic types are shown in the pictures below.
In this multimeter the mode is chosen with the switch and it has to be set to Fcx mode.Plug the probes into the sockets marked CX.
Switching the capacity limit manually. Maximum value 100 µF.
This measuring device has an automatic mode, you should only select it as shown on the picture.
Mastech pincer also measures the capacity automatically, you just have to select the mode by pressing FUNC button until the indication F.
To check the capacitance, read its value on the capacitor’s body and set a knowingly higher measurement limit on the device. (If it is not automatic)
For example: 2.5 uF (μF), but 20 uF (μF) on the instrument.
After connecting the probes to the capacitor pins, wait for the readings on the screen, for example, the time of measuring the capacitance of 40 uF by the first device. less than one second, the second. more than one minute, so you should wait.
If the nominal value does not correspond to the value printed on the capacitor case, it must be replaced and if necessary replaced by an analogue.
Starting capacitors for fans
Capacitor for a fan are used when starting and running single-phase asynchronous electrical motors, as well as in fans and cooling equipment. Devices of this type are also used as interference suppression capacitors in household appliances and electric pumps.
Repair of the fan with own hands
A fan is a device that creates a flow of air for cooling or circulates air to remove unpleasant odors or to remove harmful substances. Fans in the home are used as:
- Desktops or floor-standing units for creating comfortable conditions in the heat;
- Exhaust devices in kitchens, bathrooms and bathrooms;
- in computer equipment for cooling power units: power supply, processor, hard drives, as well as for ventilation of the case;
- welding inverters for cooling power electronic components.
Fans fail, but not all cases you need to hurry to go to the specialized workshop. The cost of repair of some products is sometimes commensurate with the cost of buying new. Therefore, it is advisable to try to repair them with their own hands.
KREMENCHUG REFRIGERATOR REPAIR 096 785 01 89
Knocking on and off the motor. The contact between the shroud of the linear compressor and the frame. put the sponge rubber of the electric motor between the cover of the motor. of the compressor and the frame; parts of the cooler are torn from their mountings. Repair the mounts; unstable refrigerator position. Fix the fridge by means of adjusting the adjusting screws; damaging of the casing. Repair the case; Vibration of the condenser radiator pipe. Fix the condenser in order; defective fan. To replace the fan.
Refrigeration unit doesn’t start. Faults in the electric wiring. Fix the malfunction; lowering of the mains voltage (the refrigerator can operate if the mains voltage drops by no more than 15% of the nominal voltage at the moment of switching on). Switch off the fridge (switch it on only if the rated voltage is available); connection of the two-wire wire to the relay terminals is broken. check the connection of the wire to the relay contacts; the connection of the two-wire wire to the sensor terminals is broken. temperature relay. Check the wire connection to the sensor terminals. Temperature switch; contact between the contacts and relay sockets was broken. Check the fit of the relay through contacts. Carefully bend conductive pin of the contact in order to obtain a good contact in the relay’s socket; refrigerant leakage from the sensor’s bellows. temperature relay. turn on the sensor. Temperature relay check by ear. If there is no click, de-energize refrigerator, remove plated terminals from sensor terminals. temperature relay. Connect the clamps (isolate them from the refrigerator metal parts) and turn on the refrigerator. If the motor starts without a temperature sensor. replace the temperature relay;
Faults in the starting or protective relay. replace the relay;
Operation or starting winding of the refrigerator electric motor is out of order. check all connections of the refrigerator electric wiring, as well as fixation and functioning of the relay. If the motor does not start with a new relay, check the operating and starting winding circuits.
If the circuit is interrupted, replace the motor. compressor. If there is no breakage, check with a device of KX type the starting and working currents; if their values do not correspond to the nominal, replace the motor. compressor;
The starting capacitor is out of order. Use a tester to check if the capacitor’s capacity corresponds to the nominal value. If the capacity of the starting capacitor differs from the nominal value by more than 15%, replace the capacitor;
The defrosting device is defective (no click at pressing the button). To switch off the fridge, pull out the defrosting device, disconnect the wires from the terminals and connect the wires between each other, having isolated them from the metal parts of the fridge. Connect the refrigerator to the mains. If the cooling unit starts to work, replace the defrosting unit;
Fault in the PCV circuit or its components in the linear motor. Compressor, protection system is working. Check the electric current frequency, the linear motor. Compressor will not operate at frequencies below 47 Hz and above 53 Hz. Disconnect the refrigerator and turn it on only when the current frequency is nominal.
Motor hums but does not start, safety relay is systematically turned off. Compressor jamming. eliminate jamming of compressor motor. Compressor jamming by briefly applying overvoltage. If compressor doesn’t start, replace compressor;
Linear motor has. compressor cables are not connected correctly. Check that the cable connections are correct.
Motor. Compressor starts up and then shuts down immediately. protection system is working. Check starting and operating currents with an appliance of the KX type; if the currents are normal, replace the protective relay. If currents are too high, replace compressor;
Replace the starting capacitors
When choosing a device, you should pay attention to the capacitance. The unit of measure for capacitance is the farad. Since one farad is a large value, products are usually labeled in milli-farads or nanofarads. A starting capacitor will definitely be needed in order to ensure operation:
The device can be matched to any power level. Thus, for two-phase motors usually choose products with a capacity of 600 uF. When ordering electrical equipment in Ukraine, you should always take into account the operating voltage. Starting capacitors are used for electric motors, the voltage of which can be in the range of 100-450 V. If you don’t use a starting capacitor, you cannot guarantee that the torque required after the motor has been activated will be reached.
What can replace the starting capacitor
Starting and working capacitors are used for starting and running electric motors operating in 220 V single-phase circuits.
That’s why they are also called phase-shifting.
Installation location between supply line and motor starter winding.
Refrigerator Condenser Fan Motor. How it Works & Installation Tips
The condenser symbol on the schematic
Replacement of condenser fan motor. Parameters for motor. Job in USA (Работа в Америке)
The graphic representation in the diagram is shown in the figure, the letter C and the serial number in the circuit.
There are two types of single-phase induction motors. bifilar (with starter winding) and capacitor motors. The difference is that with bifilar single-phase motors the starter winding only operates until the motor starts up. after acceleration, it is switched off by a special device. a centrifugal switch or an overcurrent relay (in refrigerators). This is because after acceleration, it reduces the efficiency.
In capacitor single-phase motors the capacitor winding runs all the time. Two windings. a main winding and an auxiliary winding. are offset in relation to each other by 90°. This allows the direction of rotation to be reversed. The capacitor on these motors is usually attached to the case and is not difficult to identify by this feature.