Incubator failure quiz – aquaculture industry – Precision Fasteners manufacturer
1. When turned on, start the fan switch, the fan motor Why does not work?
A: Start fan, motor does not turn, we should think of the fan motor is burned out. Many ways to judge good or bad motor, the fan motor can be removed to, direct introduction of three-phase AC motor to judge good or bad; also be measured with a multimeter the resistance profile of the three-phase motor winding, three-phase winding should be the normal resistance of 8.3 Europe about; also observed by visual inspection to judge good or bad motor.
Failure theory analysis: in determining the fan motor to normal, let us analyze the fan motor does not rise to the reason. The main fan motor control device is the fan contactor, and protect the fan motor relay device is hot. Failure Analysis: fan start switch failure, switch contact is generally not; or short-circuit switch water. Caused the fan relay or thermal burn for many reasons, the total power supply open phase, a serious imbalance in power voltage, fan contactor contact burn, the total power switch has a contact group or groups such as barrier or poor contact terminal heat may cause the fan relay; another fan motor winding short circuit, or water itself may also cause thermal relay protective action or burned.
Judgments and treatment: judgments of this failure in two ways, one is convenient and practical Shi Dianbi test method; the other is simple, accurate multimeter measurement. Specific methods slightly.
Troubleshooting steps: determine the device failure after the first remove the bad device, and then to buy the same type of device (model generally marked on the device), such as buy the same model, even to buy substitutes should also ensure the substitute function is greater than or equal to the original device. Do not just look at the appearance of the same bought everything depends on the size and model. Recommends you the best service from the company production facilities department or the designated parts sales or purchases by mail, usually have some common wear parts ready.
2. When the fan motor stops when the switch sometimes turn up when the speed is slow, how is this going? A: The fan motor work, at times, the fan suddenly stops and there, after a while, then restart? But starts a few minutes just to switch on after a while they stop to stop, but also started, so Zhou Erfu so. Sometimes occur when the fan starts, the fan motor speed is slow, after working for a non-fan stopped turning. This treatment failure if not found, over time, it is easy to burn out the motor and fan control devices. Principle of fault: If we understand the characteristics of thermal relay, then, you can understand the reason of the troubles. Thermal relay is the use of heating effect of current to protect motor from a long-term harm overload relay. The thermal relay can choose a manual reset and automatic reset button, incubation equipment, we set the thermal relay will automatically reset when the load carried by contactor overload conditions, long hours of work, the thermal relay the effective period of time in line package power disconnect contactors to protect the fan motor. But when the heat relay self-locking mechanism within the cooling, the heat inside the control switch relay in turn on the power delivered to the fan drive motor contactors work, then the fan system has returned to normal, but could not pass a few minutes, thermal relay Disconnect the contactor again heating power, turn the fan motor has stopped, again and again.
Failure Analysis and Treatment: From the above analysis we know that the cause of failure in the fan heat relays, thermal relay protection caused by the fan action because what is it? We know that the missing phase or partial load phase (a phase voltage is very low) is the main cause thermal relay.
Determine methods of direct detection, shut down the machine, based on the principles from back to front, a device to measure each judge has found the user from the fan motor power knife fuse, or may lead to lack of phase poor contact of the control device to replace or tighten.
Following points is the actual repairs that often appear in several situations: (1) AC contactor contact oxidation, poor contact or contact burn; (2) thermal relay connected part of the contacts and contact bad; (3) User Knife fuse into the wire connection is bad or loose wire terminals; (4) the device connecting wire connection is bad, especially the power switch and electrical wiring itself; (5) current adjustment thermal relay to protect low , with particular attention to the summer heat to the appropriate relay setting current increase that is generally 4.5 to 5 amps; (6) thermal relay to use for too long, their own internal locking mechanism to control aging.
These aspects can only re-installation or handling problems.
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