High and low temperature test chambers are one of the key industries in the ring test industry. The precautions in the use of high and low temperature test chambers are already a common problem. Today, Beijing Yashilin Technical Service Department summarized the three common operational faults in the use of high and low temperature test chamber refrigeration systems for the feedback of users, for reference only.
1. The compressor does not operate. First confirm whether the cooling button on the lower panel is pressed, and then open the distribution box. Refer to the electrical schematic to measure the resistance between the compressor power lines with a multimeter. If there is resistance (actually the compressor) The resistance value) and the resistance values ​​are not much different, it can be judged that the compressor coil is intact; if the resistance values ​​are very different or not at all, there may be a short circuit phenomenon or an open circuit of the coil. At the same time, you need to measure it, hook the clamp meter to any one of the three power lines of the compressor, and set the gear position of the clamp meter to the current “500A†position, and set the temperature below the ambient temperature on the controller. The temperature, the machine is running, observe whether the contactor corresponding to the compressor has a suction, if it is not attracted, it may be a button problem. If there is a suction, immediately observe the value on the ammeter, and the current value is gradually decreasing. And drop below the rated current of the compressor. If the current is always large, it may be that the compressor lacks the oil cylinder and cannot be started. The compressor needs to be replaced.
2. Do not cool down First, determine whether the cooling button on the panel is pressed. The ambient temperature of the high and low temperature test chamber should be between 5 °C and 28 °C. See the air-cooled condenser for a long time and accumulate dust. Thick, clean the dust on the condenser (purge with a compressed air qi gun).
3. Slowly determine the thermal load of the high and low temperature test chamber is too large or the blower does not turn, or the test sample is piled up too much in the test chamber (normally, it does not exceed one third of the total volume of the test chamber) The wind can not be circulated, the temperature fluctuates greatly; then it is detected that the door is not closed, whether there is a leak, check whether some solid state relays are broken down (such as heating with 2 solid state relays, 1 breakdown) leads to part The heating pipe is heated to offset part of the cooling capacity, resulting in the illusion of slow cooling. If none of the above conditions are met, it is considered that the temperature of the test box is slow or can not be lowered to the required temperature point. The refrigerant factor should be considered.
Tencel Fabrics,Tencel Twill Fabric,Linen Tencel Fabric,Cotton Tencel Fabric
SHAOXING HENGHAI TEXTILE CO.LTD. , https://www.henghaitextile.com