Alarm System Access On-off
Alarm system Access On-off Further Reading: Selection tips of Electric Fan Read random files The random files of each fan include the instruction manual, product certificate, electrical circuit diagram and packing list. When purchasing, check the packing list and check the quantity and quality...
Alarm system Access On-off
Selection tips of Electric Fan
Read random files The random files of each fan include the instruction manual, product certificate, electrical circuit diagram and packing list. When purchasing, check the packing list and check the quantity and quality of the parts.
Look at the net cover and the fan blade for obvious deformation: on the assembled fan cover, use a pen to point to the highest point of a fan blade, slowly move the fan blade, and the distance between the corresponding points of the other blades and the tip of the pen Should be very similar, turn the fan blades again, pay attention to see if the rotation is light and flexible, and can stop at any position.
See if the control mechanism is flexible: the control mechanism includes speed control switch, timing knob, moving head switch, lighting switch, etc. These control mechanisms should be flexible and reliable. For the speed control gear, it is not allowed to have two gears connected at the same time or one gear cannot be pressed. Press the stop button and each speed stop button should be reset normally.
Look at the performance of some activities: the fan fan head is flexible and flexible at all angles, and the locking is firm. Adjust to the maximum depression angle or shake the head to the final position. The mesh cover must not touch the fan pillar. When the fan is running, the stability is good, it can't be dumped, and the angle of shaking should not be lower than 60-80 degrees.
Look at boot performance: boot performance is an important quality indicator for electric fans. During the inspection, it should be adjusted in the breeze, and when the rated voltage of the power supply is 85%, the voltage regulator will reduce the voltage of 220 volts to 187 volts to start the electric fan. The electric fan should be able to start from a standstill and operate normally. The shorter the time it takes for the fan to start from normal to normal operation, the better the start-up performance of the fan motor.
Look at the operation and speed regulation performance: After the power is turned on, the head switch will be rotated several times to check whether it is malfunctioning or the assembly is too tight. In this process, the mechanical transmission part of the fan should not have abnormal noise. When the electric fan is running in the micro, medium and strong winds, the motor and the fan blades should be stable, the vibration is small, and the noise is low. The fan should be shaken and stopped, and there should be no abrupt, stagnation and jitter. The difference of the speed of each gear should be obvious, and the larger the air supply angle, the better. When the fan stops, the axial clearance of the rotating shaft does not exceed 0.5 cm, and the clearance is too large. When running, it will cause axial turbulence and impact sound.
See if there is leakage: After the electric fan is energized, if there is strong hemp inductance when the hand touches, test with the test pencil, the test pencil will also display light, and it can be judged that the outer casing is leaking and cannot be used.