(FS-61G-SP-S-ZR single pedal)
These foot switches are designed for some critical applications such press brake machine control. These foot switches have at least one of the pedals with 3 positions, with a pressure point, to control dangerous movements.
For press brake control as an example:
press the pedal to lower down a press brake. It has 4 working contacts ( 2NC+2NO) to drive the movement and one safety switches (1 positive opening NC contact + 1NO) to stop the movement. Pressing the foot pedal, until the pressure point where resistance is noticeable. This allows the changeover of the 2 working contacts and press is moving downward. When press harder beyond the pressure point, the 2 working contacts return to their first position and the positive opening safety contact is activated as redundant safety circuit in order to initiate immediately the dangerous movement. A restart of the machine is only possible after releasing the foot switch.
This is a special design foot switch with two stage momentary contacts.There are noticeable resistance between stage one and stage two when pressing the pedal without reaching the pressure point ,the foot switch operates in the normal model.In case of emergency, the user depresses the foot pedal even harder instead of releasing the pedal.This special safety foot switch will break electrical contact and locked.The manual reset button need to be pushed before it can operate in normal model.This can quickly prevent damage to the machine or injury to human life.
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