{Longhua Futian Longgang Guangming fast door installation factory} fast door motor replacement price consultation

{Longhua Futian Longgang Guangming fast door installation factory} fast door motor replacement price consultation

According to the safety standards of foreign industrial fast door (mandatory provisions), the fast door needs to have manual and self closing functions to ensure safety. When the manual door is powered off and the incremental encoder loses its position, it must rely on the external signal to determine the origin position again.

In view of the above problems, some manufacturers have to choose the scheme of proximity switch + incremental encoder, that is, the combination of 1 + 2 two feedback schemes to compensate the loss of switch signal to the position of incremental encoder. But in this case, the cost is greatly increased and the maintenance is not convenient.

The position of the full stroke absolute value encoder is continuously fed back, and the inner part is the non-contact absolute value encoder disc. It can not only measure a 360 degree single turn, but also measure the absolute value position information of multiple turns. The principle is similar to the internal clock gear. The absolute value encoder of full stroke can move without losing position information. The encoder used in industrial shutter generally uses RS485 digital signal output, which can be connected with RS485 interfaces of all kinds of Small PLC. The complete stroke absolute value multi turn encoder is generally installed at the reducer end to provide continuous absolute position feedback of the complete stroke. The controller relies on all its position information to accelerate, decelerate and stop the variable-frequency motor quickly, because this is the internal coding of the whole absolute value stroke and the propagation of RS485 digital signal does not affect the interference of frequency converter, electromagnetic brake holding interference, power failure and manual movement, but always provides the whole stroke of absolute value position feedback, The control instructions made by the controller can ensure complete consistency, so as to realize the fast and accurate repetition of the shutter with high control accuracy requirements.


Haifeng fast gate adopts the idea of incremental encoder signal feedback as position closed-loop feedback. According to this idea, the continuous position of the fast door movement can be known, and the speed of the variable frequency motor can be effectively adjusted by the controller to meet the control requirements of fast adjustment of acceleration, deceleration and parking. However, in practice, due to the principle that the interference signal of frequency converter easily interferes with the pulse increment in the inverter (the direct beam inverter inside the inverter), and the sudden electromagnetic signal interference pulse increment of electromagnetic braking, it is difficult to keep the consistency according to the feedback result of incremental stop signal. The incremental encoder can´t get accurate signal and accumulate error due to the time delay after the motor power supply fails to be braked.