The TORQ Speedetex® ESS Electronic Speed Switch is used in bulk material handling/processing systems to monitor speeds of belt conveyors, screw conveyors, bucket elevators, rotary feeder shafts, rotating drums and other types of rotating machinery to protect elevators, feeders and conveyors from speed related damage resulting from broken belts, overloads, or belt slippages.
Speed Switch features:
–Unique direct digital setpoint adjustment
–Built-in tachometer readout of speed
–Start up delay in underspeed mode
–Output state indicator alarm (output “ON” or “OFF”)
–NEMA-4 enclosure of cast aluminum and steel housing
–5/8″ shaft with double race ball bearings
–Only one moving part
–Operates reliably in “hostile” environments
–Trouble-free solid-state circuitry
–Either AC input/output or DC input/output as specified
–Available with C-face flange or standard-foot mount
–Fast response (1/16 or 1/60 turn depending on model)
–Matching stub shafts and flex couplings available
The controls are easy to set with an LCD display to precisely set speed and/or monitor actual shaft speed. The dual function tachometer/speed switch, gives the user immediate feedback at the point of operation. A key feature of the switch is that it can be set without driving the unit. Input to the LCD display is made with four pushbuttons. Two of the pushbuttons increase or decrease setpoint speeds. Another controls overspeed or underspeed selection. The fourth pushbutton sets the LCD readout to setpoint adjustment or the tachometer function. The LCD display indicates output logic (ON or OFF). The terminal block is Euro design to simplify terminal connections. The unit’s enlarged case makes it easier to install and precisely set controls.
This rugged, completely self-contained NEMA-4 switch is a rotary shaft speed detector and tachometer. It will electronically detect either underspeed or overspeed. This is accomplished by setpoint selection done directly thru pushbuttons and is displayed on the LCD readout. The actual shaft speed can be displayed on the LCD by a simple push of a button.
When the shaft speed on a piece of equipment exceeds or falls below the setpoint speed, change is immediately detected and output is provided via relay contacts to actuate motor contactors, audible alarms, warning lights, PLC’s etc. Maximum response time is the time required to rotate 1/16 of a turn at the set speed for a standard unit, or 1/60 of a turn for the high response option, after the shaft passes through the set speed. The output condition is displayed as “ON” or “OFF”. When “ON” is displayed, the driven speed exceeds the overspeed setpoint, or is below the underspeed setpoint. The output relay is de-energized in this condition and the “Alarm” contact (N.C.), closed in the output relay. The ESS also falls into this condition under loss of power providing the logic that indicates “Alarm” under power failure to the ESS.
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