Speed O Pilot

SPEED-O-PILOT is an intelligent & versatile speed limit switch suitable for detecting two under speed and over speed of rotating, reciprocating or conveying equipment. It can also detect a missing object amongst a series of continuously moving objects, moving at a constant speed, such as, a missing bucket in a bucket elevator, a missing object on a conveyor belt etc. it also gives an indication when the system is at rest (zero speed).

Salient Features

- Three independent relays for two under speed and over speed detection.
- Accurate pulse rate (speed) evaluation with optimum response.
- Easy to install. Flashing LED (in the probe head) indicates that the moving target is within the

  sensing range & facilitates target to detector distance setting.
- Easy to calibrate. The instrument can be calibrated prior to mounting, if the speed (buckets per min)

  of the system is known. Programming is user friendly & menu driven, accomplished by 4 push

  button keys.
- 4 digit LED display indicates the speed in pulses per minute (objects per min.) and aids in

  programming. Scaling factor available to achieve RPM indication.
- Built-in start-up delay programmable upto 99 seconds with provision for interlocking with controlled

  equipment.
- Programmable set point and switching hysteresis.
- 4 LED indicators provided. Green LED indicates receipt of input pulses (when flashing), 2 red LED’s

  indicate under speed alarm & Over speed alarm and yellow LED indicates power ON status.
 - A non-volatile memory stores the program parameters & calibration data indefinitely without the

  necessity of battery back-up.

Application

Monitors speed of conveyors and bucket elevators and signals an alarm if the speed falls below the set speed. It can also be used as a missing bucket detector and zero speed indicator. Special sensor detects moving ferrous objects from 100mm distance. High temperature models upto 200º C are available.

System Description

The speed monitoring system comprises of a motion detector probe (MDP) with pre-amplifier (PA) & an evaluation unit (EU). The MDP is designed for temperatures up to 120º C standard (200º C special) and has a large sensing range of 100mm. It operates on the reluctance principle. It has SS casing with an aluminum mounting flange and a tri-clamp arrangement for easy adjustment of target distance. An electronic insert is housed in the cast aluminum probe head provided with a suitable cable gland. An electromagnetic shield covers the rear of the probe to minimize interference from stray electromagnetic fields. When MDP is suitably installed to sense the moving target, the PA outputs pulses whose frequency is proportional to the speed of the moving target. These pulses are transmitted to the EU. A microprocessor in the EU processes the signal intelligently and operates the relays accordingly. When speed is less than the programmed set point, under speed relay changes state after considering the programmed value of hysteresis. If a missing object is detected, missing object relay operates & if speed is more than the programmed set point, time, the over speed relay operates. Desired value of start-up delay can be programmed upto 99 seconds. The output contacts of the relays can be used for control or alarm annunciation. While in operation, the display indicates the actual speed in pulses per minute.

Technical Data  

Evaluation Unit

PRE-AMPLIFIER (Electronic Insert)

Probes