• Protocontrol Instruments (India) Private Limited

Addressable Pull Cord System - Trip Indicator

Protocontrol Instruments (India) pioneered the concept of Addressable Pull Cord System – Trip Indicator. This is first of its kind with proven concept with distinct advantage and hence very popular for short and long conveyors the industry worldwide. By using this system number of operated switch is displayed in control room. This eliminates downtime required to locate the operated switch. The system consists of communication card which is to be housed in every pull cords switch and trip indicator which is to be located in control room. When specific switch is operated the communication card communicates to trip indicator, which displays number of operated switch and also actuates a contact for tripping. The wiring between pull cord switch and trip indicator is to be done by ordinary two core cable. The indicator displays the number of operated switch and actuates relay contact for tripping the conveyor. It also communicates to PLC/DCS by MODBUS communication. Special features like Scrolling (display all locations of multiple operated switches at a time), Roll call (indicates missing/failure/loose connection/ line fault of communication card on display with optional tripping. Performance of this system is established at many cement, steel plants and power stations. Various models are available for small and extra long conveyors. Protocontrol also offers belt watch panels.