Differences Between Torque Control & Force Sensitive Door Leaf

Torque control system and force sensitive door leaf are the two most important safety functions for the automatic revolving doors, they are also the standard safety functions of TSTC automatic revolving doors. These 2 functions are similar but different, the part below will bring a brief description.

The two functions are similar because both of them to realize the safety feature by changing the electric current, but the details is a little different .

The Torque Control System is very important and necessary to the automatic revolving door's safety feature, it was realized mainly by motor and PLC (Key control unit ). First, we will preset a safety area for the revolving door, like the area near the door closing position, then convert this area to the motor's position information . Second, we will develop the program to the PLC (mostly for SIEMENS and LENZ brand), this program is related to the motor and electrical signal . When the door wing revolve into this safety area, the PLC will control the motor's electric current to be a small value, then the output torque of the motor will also become smaller, to guarantee the safe to the people .With the help of this torque control function, when someone enter this safety area and the gap to the closing position is less than the certain distance ( within the safety area above), the driving force will be reduced, so even if a passerby tries to rush in, he will not be injured.

The Force Sensitive Door Leaf is a little different from the torque control system. To the force sensitive door leaf, when someone enter the revolving door and touch the door wing, the rotating of the door wing will be obstructed, and the electric current will become bigger. When PLC received this bigger signal and found it was higher than the preset value, it will send the signal to the inverter to let the inverter output the smaller electric current to the motor, then the driving force of the motor will become smaller finally, to ensure the safety of the people passing through .